[BS en 13203-5] -- Gas-fired Domestic Appliance Producing Hot Water. Assessment of Energy...

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Latest date for receipt of comments: 31 December 2012 Project No. 2012/01934Responsible committee: GSE/29 Gas-fired central heating boilers (domestic and non-domestic) and domestic gas-fired waterheaters

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Date: 17 September 2012Origin: European

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Title: Draft BS EN 13203-5 Gas-fired domestic appliance producing hot water

Part 5: Assessment of energy consumption of gas fired appliances combined with electrical heat pump.

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EUROPEAN STANDARD

NORME EUROPENNE

EUROPISCHE NORM

DRAFT prEN 13203-5

September 2012

ICS 91.140.65

English Version

Gas-fired domestic appliance producing hot water - Part 5: Assessment of energy consumption of gas fired appliances

combined with electrical heat pump

Appareils domestiques produisant de l'eau chaude sanitaire utilisant les combustibles gazeux - Partie 5: Evaluation de la consommation nergtique des appareils utilisant les combustibles gazeux combins une pompe chaleur

lectrique

Gasbeheizte Gerte fr die sanitre Warmwasserbereitung fr den Hausgebrauch - Teil 5: Bewertung des

Energieverbrauchs von Gasgerten mit elektrischer Wrmepumpe

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 109. If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION C O M I T E U R O P E N D E N O R M A LI S A T I O N EUR OP IS C HES KOM ITEE FR NOR M UNG

Management Centre: Avenue Marnix 17, B-1000 Brussels

2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members.

Ref. No. prEN 13203-5:2012: E

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Contents Page

Foreword ..............................................................................................................................................................31 Scope ......................................................................................................................................................32 Normative references ............................................................................................................................33 Terms and definitions ...........................................................................................................................44 General test conditions .........................................................................................................................54.1 Reference conditions ............................................................................................................................54.2 Specific heat source conditions ...........................................................................................................64.3 Measurement uncertainties ..................................................................................................................64.4 Test conditions ......................................................................................................................................74.4.1 General ....................................................................................................................................................74.4.2 Test installations....................................................................................................................................74.4.3 Water supply ..........................................................................................................................................84.4.4 Steady state ............................................................................................................................................84.4.5 Initial adjustment of the appliance .......................................................................................................84.4.6 Electrical supply ....................................................................................................................................95 Determination of the energy consumption of appliances .................................................................95.1 General ....................................................................................................................................................95.2 Tapping cycles .......................................................................................................................................95.2.1 General ....................................................................................................................................................95.2.2 Test for determination of the daily energy consumption ............................................................... 15Annex A (informative)...................................................................................................................................... 20Annex B (informative) Test rig and measurement devices ......................................................................... 23Annex C (normative) ........................................................................................................................................ 27

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Foreword

This document (prEN 13203-5:2012) has been prepared by Technical Committee CEN/TC 109 Central heating boilers using gaseous fuels, the secretariat of which is held by NEN.

This document is currently submitted to the CEN Enquiry.

1 Scope

This European Standard is applicable to gas-fired appliances producing domestic hot water. It applies to both instantaneous and storage gas-fired appliances combined with electrical heat pump. It applies to a package marketed as single unit or fully specified by a manufacturer that have:

a gas heat input not exceeding 70 kW;

a hot water storage capacity not exceeding 500 litres.

This European Standard EN 13203 is formed in several parts which cover aspects of domestic hot water production.

Standard EN 13203-1 sets out in qualitative and quantitative terms the performance in delivery of domestic hot water for a selected variety of uses. It also gives a system for presenting the information to the user. This first part complements EN 26, EN 89 and EN 625.

This Part 5 sets out a method for assessing the energy performance of gas fired appliances combined with heat pump with electrically driven compressor according to EN 16417.

This European standard does not apply for gas boilers with recovery systems using combustion products as heat source for the electrical heat pump.

When the electrical heat pump does not work for domestic hot water production in the summer period, the present standard is not applicable for energy performances assessing, EN 13203-2 must be used for energy performances assessing.

2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies..

EN 26, Gas-fired instantaneous water heaters for sanitary uses production, fitted with atmospheric burners (Including Corrigendum 1998)

EN 89, Gas-fired storage water heaters for the production of domestic hot water.

EN 625, Gas-fired central heating boilers - Specific requirements for the domestic hot water operation of combination boilers of nominal heat input not exceeding 70 kW.

EN 13203-1:2006, Gas-fired domestic appliances producing hot water Appliances not exceeding 70 kW heat input and 300 litres water storage capacity. Part 1: Assessment of performance of hot water deliveries.

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EN 13203-2, Gas-fired domestic appliances producing hot water Appliances not exceeding 70 kW heat input and 300 litres water storage capacity. Part 2: Assessment of energy consumption.

EN 14511-3:2011, Air conditioners, liquid chilling packages and heat pumps with electrically driven compressors for space heating and cooling Part 1: Tests methods.

EN 16147, heat pumps with electrically driven compressors Testing and requirements for marking for domestic hot water units.

3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply.

3.1 control cycle time cycle for keeping components and/or the tank (if any) of the domestic hot water circuit at predetermined temperature level, consists of an ON duration time during which the heating of the domestic hot water (by gas energy and/or auxiliary energy) is operating, and an OFF duration time during which no heating occurs

3.2 domestic water mean temperature average temperature of the water delivered during the time t

= tTtT d1m SYMBOL Tm

3.3 domestic water test temperature temperature of the delivered water at which the tests are conducted

3.4 nominal domestic hot water heat input value of the heat input stated by the manufacturer for the production of domestic hot water1.

SYMBOL Qnw

Note 1 to entry: Qnw is expressed in kilowatt (kW)

3.5 off mode state of an appliance, selected by the user, in which domestic hot water can not be provided

3.6 stand-by mode operating state in which the appliance can provide domestic hot water at any time. In the case of an appliance with a control cycle for keeping components and/or the tank (if any) of the domestic hot water circuit at predetermined temperature level, no tapping is made

3.7 summer mode conditions during which the appliance supplies energy only for the production of domestic hot water

1 The manufacturer is the organisation or company which assumes responsibility for the product.

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3.8 tank (storage tank) reservoir for domestic hot water and or central heating water

3.9 useful water quantity of water delivered for which the temperature increase is in accordance with the requirement fixed for each individual delivery of the tapping cycles

3.10 wasted water quantity of water delivered for which the temperature increase is not in accordance with the requirement fixed for each individual delivery of the tapping cycles

3.11 winter mode conditions during which the appliance supplies energy for the production of domestic hot water and/or space heating

3.12 indoor ambient air indoor ambient air is the heat source for a heat pump which absorbs heat by a heat exchanger in direct contact with the air inside a building without any dedicated duct

3.13 brine heat transfer medium which has a freezing point depressed relative to water

3.14 gas-fired appliance combined with electrical heat pump appliance which is either placed on the market by the manufacturer or specified by the manufacturer as a complete package to deliver safely and effectively domestic hot water and/or heating, comprising as relevant:

electrical heat pump;

gas-fired appliance;

ducts if appropriate;

thermal store.

4 General test conditions

4.1 Reference conditions

Unless otherwise stated, the general test conditions are as follows:

cold water temperature: (10 2), in C;

cold water pressure: (2 0,1), in bar;

ambient air temperature: (20 3), in C;

electrical supply voltage:

(230 2), in V single phase;

(400 4), in V three phases;

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4.2 Specific heat source conditions

The tests shall be carried out at the test conditions specified in Tables 1 as appropriate.

Table 1 - Test conditions for particular types of systems

Type of heat source

Heat source temperature

(C) Range of ambient

temperature for heat pump (C)

Ambient temperature of

storage tank (C)

Outside air (heat pump indoor) with air duct

7 0,2

(6 0,3)

20 3

20 3

Outside air (heat pump outdoor)

7 0,2

(6 0,3)

7 3 a)

20 3

Exhaust air

20 0,2

(12 0,3)

20 3 a)

20 3 a)

Water (inlet)

10 0,15

20 3

20 3

Brine (inlet)

0 0,15

20 3

20 3

Direct evaporation 4 0,5

20 3

20 3

a) In this case the ambient temperature of the heat pump is the same as the temperature of the heat source (the difference with EN 16147 is justified because of the possible installation of the appliance into a living room)

Note 1: All heat source temperatures are inlet temperatures in C.

Note 2: All air temperatures in (brackets) are wet bulb temperatures in C.

Note 3: Permissible external pressure difference and associated internal pressure difference at the outdoor heat exchanger shall be indicated by the manufacturer in Pascal (Pa) for appliances with duct connection.

4.3 Measurement uncertainties

Except where otherwise stated in the clauses describing the tests, the uncertainties of measurements carried out shall be not greater than the maximum uncertainties indicated below.

The laboratory evaluates these standard deviations taking account of the various sources of uncertainty: contribution from the instrument, repeatability, calibration, ambient conditions etc.:

water rate: 1 %;

gas rate: 1 %;

time: 0,2 s;

temperatures:

ambient air: 1 C;

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air as heat source dry bulb temperature: 0,2C;

air as heat source wet bulb temperature: 0,3C;

water: 0,5 C;

gas: 0,5 C;

mass: 0,5 %;

gas pressure: 2 %;

gas calorific value: 1 %;

gas density: 0,5 %;

electrical energy: 2 %.

The stated measurement uncertainties relate to individual measurements. For measurements that combine a number of individual measurements, smaller uncertainties on the individual measurements may be necessary to ensure a total uncertainty within 5 % (2).

4.4 Test conditions

4.4.1 General

Except where otherwise stated, the appliance is tested under the following conditions.

For combination boilers the tests are carried out only in summer mode.

The test conditions are given in Table 1.

If liquid heat transfer media other than water are used, the specific heat capacity and density of such heat transfer media shall be determined and taken into consideration in the evaluation;

4.4.2 Test installations

The package is installed in a well-ventilated, draught-free room (air speed less than 0,5 m/s).

The package is protected from direct solar radiation.

If the package incorporates an air source outdoor heat exchanger a further test room is needed. The size of this test room shall be designed to avoid any resistance to air flow at the air inlet and air outlet orifices of the test object. The air flow through this room shall not cause any short circuit between the two orifices, and therefore the velocity of air flow at these two locations shall not exceed 1,5 m/s when the test object is switched off. The air velocity in the room shall also not be greater than the mean velocity through the unit inlet.

Unless otherwise stated by the manufacturer, the air inlet and air outlet orifices shall not be less than 1m from the surfaces of the test room; this also applies to any measuring ducts.

Any direct heat radiation (p. ex. solar radiation) from heating units in the test room onto the heat pump or onto the temperature measuring points shall be avoided

The setting of the external static pressure difference on the air side for heat pumps with duct connection is described in EN 14511-3:2011 (see sub-clauses 4.4.1.1 to 4.4.1.3).

For heat pumps separated from the tank, the liquid flow rate has to be set on the liquid outlet side of the heat pump to the nominal flow rate specified by the manufacturer.

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The package shall be installed and connected for the test as specified by the manufacturer in his installation and operation manual.

Temperature and pressure measuring points shall be situated in order to obtain significant mean values.

Set points for internal control equipment of the unit such as thermostats, pressure switches or mixing valves shall be set to the values stated by the manufacturer.

Air and entrained gases shall be removed from all water and other heat transfer liquid systems.

In the case of package incorporating a single split heat pump, the following installation conditions shall be complied with for the tests:

a) each refrigerant line shall be installed in accordance with the manufacturer's instructions. The length of each line must be between 5 m and 7,5 m;

b) the lines shall be installed so that the difference in elevation does not exceed 1 m;

c) thermal insulation shall be applied to the lines in accordance with the manufacturer's instructions;

d) unless constrained by the design at least half of the interconnecting lines shall be exposed to the outdoor conditions with the rest of the lines exposed to the indoor conditions.

For indirect systems each water line shall be installed in accordance with the manufacturer's instructions to the maximum stated length or 5 m whichever is shorter. Thermal insulation shall be applied to the lines in accordance with the manufacturer's instructions.

4.4.3 Water supply

For the tests:

the domestic water pressure is the static inlet pressure under dynamic conditions measured as close as possible to the appliance;

the inlet and outlet temperatures of the domestic water are measured in the centre of the flow and as close as possible to the appliance.

The inlet temperatures are measured immediately upstream of the water inlet connection. Except where otherwise stated, the outlet temperatures are measured immediately downstream of the outlet connection or, in the case of an appliance with spout delivery, by means of an immersed temperature measuring device, e.g. a u-tube fitted at the outlet of a tube of the same length as the minimum length of the spout normally supplied by the manufacturer.

The hot water temperature is measured with a rapid response thermometer.

"Rapid response thermometer" means a measuring instrument with a response time such that 90 % of the final temperature rise, from 15 C to 100 C, is obtained within about 1 s, when the sensor is plunged into still water.

4.4.4 Steady state

Steady state operating conditions shall be regarded as established when the rate of change of the domestic hot water temperature at the appliance outlet has become less than the temperature fluctuation at constant water rate T2 according to sub-clause 3.8 of EN 13203-1:2006.

4.4.5 Initial adjustment of the appliance

The appliance is installed in accordance with the manufacturer's instructions.

The heat input shall be adjusted to within 2 % of the nominal domestic hot water heat input under the conditions prevailing at the time of the test.

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The delivered water temperature at the appliance outlet is defined as follows (see Figures A.1.1 and A.1.2):

a) appliances with an adjustable temperature: the tests are carried out at a temperature not greater than 65 C, with a minimum temperature increase equal to or greater than 45 K above water inlet temperature;

b) appliances with a fixed temperature: the tests are carried out at the temperature specified by the manufacturer, with a minimum temperature increase equal to or greater than 45 K.

The same conditions of initial adjustment stated by the manufacturer shall be used for all the tests. These conditions shall be included in the test report.

4.4.6 Electrical supply

The appliance is supplied with the nominal voltage or a voltage included within the range of nominal voltages.

5 Determination of the energy consumption of appliances

5.1 General

The present clause defines the test methods to be employed in determining the energy consumption of appliances.

5.2 Tapping cycles

5.2.1 General

All patterns define a 24 h measurement cycle and within that cycle the starting times and the total energy content (in kWh equivalent of hot water tapped) of each draw-off are defined.

Furthermore, the draw-off can be characterized in two ways, either:

a) Basin type draw-off (bath, dishwash) versus continuous flow draw-offs (shower, etc).

The aim of the former is to arrive at an average temperature of the tub, so all supplied energy can be considered useful from the very beginning of the draw-off (minimum useful temperature increase is 0 K).

The latter start to be useful only from a certain temperature (minimum useful temperature increase is 15 K lower than the desired temperature), or

b) Dish washing type draw-off which is carried out with a water temperature increase of 45 K rather than the 30 K in a).

The tapping flow rates used to perform the different types of tapping of each of the five tapping cycles defined by Tables 3 to 7 should be taken as given by Table 2.

When these tapping rates result in a tapping period of less than 15 s the flow rate should be decreased such that the tapping period is (15 1) s.

If by design of the appliance the test cannot be carried out with these low flow rates, the minimum flow rate for the ignition of the appliance is taken.

If by design the appliance is fitted with an excess flow valve, the tests are carried out with this excess flow rate.

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Table 2 Tapping flow rates

Type of tapping Energy

(kWh)

Hot water flow rates corresponding to a

temperature rise of 45 K

(l/min)

Household cleaning 0,105 3 0,5

Small 0,105 3 0,5

Floor cleaning 0,105 3 0,5

Dish washing 0,315 4 0,5



Large (cycle n1) 0,525 4 0,5

Shower 1,400 6 0,5

Shower (cycles n4 et n5) 1,800 6 0,5

Bath 3,605 10 0,5

Bath (cycle n4) 4,420 10 0,5

Shower + Bath (cycle n5) 6,240 16 0,5

NOTE For all other temperature rises a proportional correction is applied to the hot water flow rate, as follows: K = (55 10) / (delivered water temperature defined by 4.3.5 10).

Table 3 Tapping cycle n 1

Start (h.min) Energy (kWh)

Type of delivery T desired (K), to be achieved during tapping

Min. T (K), = start of counting

useful energy

1 07.00 0,105 Small 15

2 07.30 0,105 Small 15

3 08.30 0,105 Small 15

4 09.30 0,105 Small 15

5 11.30 0,105 Small 15

6 11.45 0,105 Small 15

7 12.45 0,315 Dish washing 45 0

8 18.00 0,105 Small 15

9 18.15 0,105 Household cleaning 30

10 20.30 0,420 Dish washing 45 0

11 21.30 0,525 Large 30

Total 2,1

Equivalent hot water litres at 60 C 36

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Type of delivery T desired (K), to be achieved

during tapping


useful energy

1 07.00 0,105 Small 15

2 07.15 1,400 Shower 30

3 07.30 0,105 Small 15

4 08.01 0,105 Small 15

5 08.15 0,105 Small 15

6 08.30 0,105 Small 15

7 08.45 0,105 Small 15

8 09.00 0,105 Small 15

9 09.30 0,105 Small 15

10 10.30 0,105 Floor cleaning 30 0

11 11.30 0,105 Small 15

12 11.45 0,105 Small 15

13 12.45 0,315 Dish washing 45 0

14 14.30 0,105 Small 15

15 15.30 0,105 Small 15

16 16.30 0,105 Small 15

17 18.00 0,105 Small 15



20 19.00 0,105 Small 15

21 20.30 0,735 Dish washing 45 0

22 21.15 0,105 Small 15

23 21.30 1,400 Shower 30

Total 5,845

Equivalent hot water litres at 60 C 100,2

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during tapping


useful energy

1 07.00 0,105 Small 15

2 07.05 1,400 Shower 30

3 07.30 0,105 Small 15

4 07.45 0,105 Small 15

5 08.05 3,605 Bath 30 0

6 08.25 0,105 Small 15

7 08.30 0,105 Small 15

8 08.45 0,105 Small 15

9 09.00 0,105 Small 15

10 09.30 0,105 Small 15

11 10.30 0,105 Floor cleaning 30 0

12 11.30 0,105 Small 15

13 11.45 0,105 Small 15

14 12.45 0,315 Dish washing 45 0

15 14.30 0,105 Small 15

16 15.30 0,105 Small 15

17 16.30 0,105 Small 15

18 18.00 0,105 Small 15



21 19.00 0,105 Small 15

22 20.30 0,735 Dish washing 45 0

23 21.00 3,605 Bath 30 0

24 21.30 0,105 Small 15

Total 11,655

Equivalent hot water litres at 60 C 199,8

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during tapping


useful energy

1 07.00 0,105 Small 15

2 07.15 1,82 Shower 30

3 07.26 0,105 Small 15

4 07.45 4,42 Bath 30 0

5 08.01 0,105 Small 15

6 08.15 0,105 Small 15

7 08.30 0,105 Small 15

8 08.45 0,105 Small 15

9 09.00 0,105 Small 15

10 09.30 0,105 Small 15

11 10.00 0,105 Small 15

12 10.30 0,105 Floor cleaning 30 0

13 11.00 0,105 Small 15

14 11.30 0,105 Small 15

15 11.45 0,105 Small 15

16 12.45 0,735 Dish washing 45 0

17 14.30 0,105 Small 15

18 15.00 0,105 Small 15

19 15.30 0,105 Small 15

20 16.00 0,105 Small 15

21 16.30 0,105 Small 15

22 17.00 0,105 Small 15

23 18.00 0,105 Small 15



26 19.00 0,105 Small 15

27 20.30 0,735 Dish washing 45 0

28 20.46 4,42 Bath 30 0

29 21.15 0,105 Small 15

30 21.30 4,42 Bath 30 0

Total 19,07


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during tapping


useful energy

1 07.00 0,105 Small 15

2 07.15 1,82 Shower 30

3 07.26 0,105 Small 15

4 07.45 6,24 Shower + bath 30 0

5 08.01 0,105 Small 15

6 08.15 0,105 Small 15

7 08.30 0,105 Small 15

8 08.45 0,105 Small 15

9 09.00 0,105 Small 15

10 09.30 0,105 Small 15

11 10.00 0,105 Small 15

12 10.30 0,105 Floor cleaning 30 0

13 11.00 0,105 Small 15

14 11.30 0,105 Small 15

15 11.45 0,105 Small 15

16 12.45 0,735 Dish washing 45 0

17 14.30 0,105 Small 15

18 15.00 0,105 Small 15

19 15.30 0,105 Small 15

20 16.00 0,105 Small 15

21 16.30 0,105 Small 15

22 17.00 0,105 Small 15

23 18.00 0,105 Small 15



26 19.00 0,105 Small 15

27 20.30 0,735 Dish washing 45 0

28 20.46 6,24 Shower + bath 30 0

29 21.15 0,105 Small 15

30 21.30 6,24 Shower + bath 30 0

Total 24,53


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5.2.2 Test for determination of the daily energy consumption

5.2.2.1 Tapping cycles

There are five different tapping cycles, depending on the use.

For each use, the tapping cycle(s) is (are) based respectively on Tables 3, 4, 5, 6 and 7. Each individual tapping of the tapping cycles shall be completed, that means the valve shall be closed, and a delay of at least one minute is required, before starting the following delivery.

Beginning of the tapping cycles:

For instantaneous appliances with no energy consumption between deliveries (gas or electricity), the measured programme starts at 07h00 with the appliance cold and finishes when the burner is extinguished after the 21h30 tapping (see Figure A.2.1).

For appliances with storage tank with energy consumption between deliveries (gas or electricity), the tapping cycle starts directly after the last shut off of the heat pump by the hot water thermostat situated in the tank.The test cycle ends with the last shut off of the heat pump, if tapping cycle time tTTC is at least 24 h or more (see Figure 1, upper part). If the heat pump is not running when 24 h have passed from the start of the test cycle, the test cycle has to be extended until the heat pump restarts and stops again (see Figure 1, lower part).

Key A first tapping of a tapping cycle B last tapping of a tapping cycle C running period of the heat pump directly before the start of the tapping cycle D running period of the heat pump after last tapping (B) tTTC time length of tapping cycle

Figure 1 Illustration of a test for possible tapping cycle

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5.2.2.2 Measurement of the energy recovered by the useful water

The useful energy recovered by the water QH2O (kWh) is given by the following equation:

=

=

n

1i

t

0iiOH

13

2dt(t)10163,1 TdQ

where

n is the number of tappings;

di is the water rate delivered in litre per minute;

Ti (t) is the instantaneous temperature rise during the tapping, in Kelvin;

ti is the tapping duration of the useful water, in minute.

The useful energy recovered at each individual tapping is set against the values given in Tables 3, 4, 5, 6 and 7.

For each individual delivery, the accuracy of the value shall be 10 Wh or 2 % with a tolerance on the overall energy recovery of 2 %.

5.2.2.3 Calculation of gas energy

The daily consumption of gas is calculated according to the following equation:

OH

totggas

2Q

QNCVKVQ

= (1)

where

Qgas is the daily energy contributed in kWh calculated using NCV;

Vg is the gas consumption in m3;

NCV is the net calorific value in kWh/m3 (at 15 C and 1 013,25 mbar);

and

273,15288,15

013,251 gga

+

+=

Tpp

K (2)

where

pa is the atmospheric pressure, in mbar;

pg is the gas pressure, in mbar;

Tg is the gas temperature, in C;

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QH2O is the measured energy recovered by the water according to 5.2.2.2, in kWh;

Qtot is the total delivered energy of used tapping cycle, value from Tables 3, 4, 5, 6 and 7, in kWh.

5.2.2.4 Calculation of electrical energy

The electrical energy of the heat pump and all the electrical auxiliaries necessary to achieve the tapping programme(s) at nominal use selected by the manufacturer will be measured even if the auxiliaries are not integrated in the appliance.

Where an electrical auxiliary (e.g. a pump) necessary for the delivery of hot water is not included as an integral part of the appliance, then the essential characteristics of the component shall be specified in the appliance installation instructions. An appropriate component shall be used for test procedures.

The measurement of the electrical consumption starts at the same time and finishes at the same time as the measurement of the gas consumption.

This measurement is corrected, as the gas consumption, according to the following equation:

OH

totelecmeselecco

2QQ

EE =

where

Eelecco is the corrected total electrical energy in kWh;

Eelecmes is the measured total electrical energy in kWh;

OH 2Q is the measured energy recovered by the water according to 5.2.2.2 in kWh;

Qtot is the total delivered energy of used tapping cycle, value from Tables 3, 4, 5, 6 and 7 in kWh.

5.2.2.5 Determination of the wasted water for the tapping cycle N2

For each individual delivery the quantity of wasted water is determined and given in litres by the following equation:

wiw tdV =

where

Vw is the quantity of wasted water in litres;

di is the water rate delivered in litres per minute;

tw is the tapping duration of the wasted water in minutes.

The total quantity of the wasted water is equal to the sum of the wasted water quantities of each individual delivery.

This value is expressed in percentage of the overall quantity of the useful water delivered during the measurement of 5.2.2.2.

R = (Vw/Vu) 100

where

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=

=n

1i 0iiu

1

dtt

tdV , and =

=n

1i 0wiw

1

dtt

tdV

where

Vw is the quantity of wasted water in litres;

Vu is the quantity of useful water in litres;

R is the percentage of the wasted water;

ti is the tapping duration of the useful water in minutes

5.2.2.6 Measurement of energy consumption with stand-by mode

Unless specified, the energy consumed in stand-by mode is measured for a 24 h period without tapping.

The gas and auxiliary energy consumption may be measured for a duration time (Ta) equal to one or several control cycles, once the appliance is operating in a regular manner (see Figure A.2.3).

The daily consumption of gas is calculated according to the following equation:

aggas.stb

24T

NCVKVQ =

where

Qgas.stb is the daily energy consumed in kWh calculated using NCV;

Vg is the gas consumption in m3 during the test;

NCV is the net calorific value in kWh/m3 (at 15 C and 1013,25 mbar);

Ta is the duration of the test in hours.

and

273,15288,15

013,251 gga

+

+=

Tpp

K

where

Pa is the atmospheric pressure, in mbar;

Pg is the gas pressure, in mbar;

Tg is the gas temperature, in C.

The daily consumption of auxiliary energy is calculated according to the following equation:

abelecmes.stelecco.stb

24T

EE =

where

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Eelecco.stb is the daily consumption of auxiliary energy, in kWh;

Eelecmes.stb is the auxiliary energy measured during the test, in kWh;

Ta is the duration of the test in hours.

5.2.2.7 Measurement of auxiliary energy consumption during the off mode

The auxiliary energy consumption is measured for a duration time equal to one hour.

The daily consumption of auxiliary energy is calculated according to the following equation:

24felecmes.ofelecco.off = EE

where

Eelecco.off is the daily consumption of auxiliary energy, in kWh;

Eelecmes.off is the auxiliary energy measured during the test, in kWh.

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Annex A (informative)2)

Test conditions

Key

A temperature (C) B time (min) C hot water D cold water

Figure A.1.1 Initial adjustment of the appliance with storage maintained in temperature

Key

A temperature (C) B time (min) C hot water D cold water

Figure A.1.2 Initial adjustment of the appliance without storage maintained in temperature

2) These figures are purely informative and are given as examples.

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Key

A delivered elementary energy, kW/h B time (h) C gas rate D beginning of the measurement programme E end of the measurement programme

Figure A.2.1 Tapping cycle Test cycle for measurement of the energy consumption of the appliance with storage maintained in temperature

Key

A delivered elementary energy, kW/h B time (h) C gas rate D beginning of the measurement programme E end of the measurement programme

Figure A.2.2 Tapping cycle Test cycle for measurement of the energy consumption of the appliance without storage maintained in temperature

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Key

A time (h)

Figure A.2.3 Stand by mode with control cycles

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Annex B (informative)

Test rig and measurement devices

B.1 General

A general diagram of a possible test rig is shown in Figure B.1.

Key

1 water 2 preparator of water at 10 C 3 diaphragm to homogenise the temperature and pressure profile across the tube diameter 4 temperature measurement device 5 equilibrium valve 6 electrovalve 7 flowmeter 8 control valve 9 rate control 10 drain 11 appliance in test 12 pressure measurement device 13 pressure control

Figure B.1 Example of test rig

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B.2 Pressure measurement

An example of the pressure measurement device is shown in Figure B.2. The lengths of the pipe upstream and downstream of the pressure measurement device are 15 di and 5 di, where di is the diameter of the pipe.

Figure B.2 Example of pressure measurement device

B.3 Temperature measurement

Temperature sensors used in the test rig could be:

thermocouples of type T, class 1, diameter of 0,5 mm;

low inertia Pt 100 probe, diameter of 2 mm.

The temperature measurement device could be equipped with:

3 thermocouples + 1 Pt 100 probe, diameter 2 mm, or

4 thermocouples + 1 Pt 100 probe, diameter 2 mm.

An example of a temperature measurement device is shown in Figure B.3.

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Key

1 outlet of the appliance in test (hole with D) 2 diaphragm to homogenise the temperature and pressure profile across the tube diameter 3 thermocouple 4 platine probe

Figure B.3 Example of temperature measurement device

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The position of the thermocouples (three or four with one thermocouple at the centre of the flow) could be as shown in Figure B.4.

Figure B.4 Example of position of thermocouples Method of surfaces

Other measuring instruments may be used provided the results required in the standard are obtainable.

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Annex C (normative)

Packages covered by the present standard

Key 1 heating circuit (CH) 2 three way valves 3 boiler 4 electrical heat pump 5 source 6 storage tank 7 tapping valve 8 domestic hot water (DHW) 9 domestic cold water (DCW)

Figure C.1 Combi package used to produce hot water (DHW) and CH/hot water (DHW)

This package can operate in three different ways:

the heat pump alone: if the source supplies enough energy to heat the water, the boiler does not start and the heat pump is used alone.

the boiler alone: if the source does not supply any energy, the boiler operates alone.

the heat pump and the boiler in series: the heat pump preheats the water which is then heated in the boiler and used to produce DHW in the storage tank.

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Key 1 domestic hot water (DHW) 2 tapping valve 3 boiler (Water Heater) 4 electrical heat pump 5 source 6 storage tank 7 domestic cold water (DCW)

Figure C.2 Package used to produce instantaneous hot water (DHW)

This package can operate in 3 different ways: the heat pump alone: if the source supplies enough energy to heat the water in the lower part of the storage

tank, the boiler does not start and the heat pump is used alone.

the boiler alone: if the source does not supply any energy to the storage tank, the boiler is supplied by cold water (CH) from the storage tank and then operates alone.

the heat pump and the boiler in series: the heat pump preheats the water in the lower part of the storage tank and the boiler heat up the water in the upper part of the storage tank to produce hot water (DHW).

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Key 1 heating circuit (CH) 2 three way valves 3 boiler 4 electrical heat pump 5 source 6 domestic hot water (DHW) 7 storage tank 8 domestic hot water (DCW)

Figure C.3 Combi package used to produce hot water (DHW) and CH/hot water (DHW)

This package can operate in 3 different ways: the heat pump alone: if the source supplies enough energy to heat the water in the storage tank, the water

heater (boiler) does not start and the heat pump is used alone.

the boiler alone: if the source does not supply any energy to the storage tank, the water heater (boiler) operates alone.

the heat pump and the boiler in series: the heat pump preheats the water in the storage tank which is then heated in the water heater (boiler) to produce instantaneous hot water (DHW) from the storage tank.

[BS en 13203-5] -- Gas-fired Domestic Appliance Producing Hot Water. Assessment of Energy...

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Transcript of [BS en 13203-5] -- Gas-fired Domestic Appliance Producing Hot Water. Assessment of Energy...