Air to Water Low Temperature Heat Pump
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Transcript of Air to Water Low Temperature Heat Pump
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Air to Water Heat PumpIntroduction
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Air to Water Heat Pump
• Split System• Monobloc• DHW• Solar Thermal
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Introduce an electric hydronic system that heats and cools the space, and can supply domestic hot water.
Eco-efficient air-to-water heat pump hydronic system.
Introduced in Europe in 2005, a unique combination using existing technology.
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Table of Contents
1. Introduction to ATW Heat Pump
2. System Layout and Applications
3. Balance Point Strategies
4. Programming for Energy Savings
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Drivers to a Changing Heating Market
• The Heating Market is Changing– Energy prices : ever rising prices of fossil fuels due to
increasing demand and reduced availability– Ecological concern : efforts to reduce emmissions of
green house gases and energy consumption– Changing legislations, incentives : to support the drive
towards major changes in energy consumption habits for the purpose of achieving ecological targets in an effort to slow down, stop or even reverse climate change.
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With DAIKIN ALTHERMA product, DAIKIN has entered the true HEATING market
High Temp. :
Radiator
Water heating marketProduct differention
1. Savings on running costs by high COP compared with Gas/Oil boilers2. Friendly for the environment3 . Differentiation with cooling function against boilers
Low temp :
Floor heating
In 2006 DAIKIN entered the EU-heating market using an air to water heatpumpIn 2009, Daikin AC will launch this technology in the U.S
< Initial U.S.Target market >
1 Savings on running costs
3 Easy installation
- No need for chimney- No need for fuel storage tank- No need for connection to gas supply
2 Environmently friendly
-40% compared to fuel boilers
-25% compared to gas boilers
60 % savings on CO2-emissions
Enter the LOW temperature heating market by development of an HFC-based H/P
Mainly new houses
Heat source market:
Enter the HIGH temperature heating market by using a Cascade System (R-410A to R-134). Orignally a CO2-based H/P was going to be used. Issues with high operating pressures ruled this option out at this time.
Mainly refurbishment
DAIKIN original strategy:
Capitalize on initial product scope to strengthen opportunity in wider heat pump market with HT solutions
30 to 50°C86 to 122°F
50 to 80°C122 to 176°F
NW
NW NECold Region
Heat Pump acceptableCheap Electricity
Rebate Opportunities
Hydronic Heat CommonHybrid Altherma or G/FRebate Opportunities
2009
2010
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Typical conditions for the heating LWT are: 86 to 95°F (at design conditions) for floor heating86 to 113°F (at design conditions) for fan coil units and104 to 122°F (at design conditions) for low temperature radiators Typical conditions for cooling LWT are: 41 to 71°F (at design conditions) for fan coil unit
Selection conditions
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TOTAL CONCEPT FOR CLIMATE CONTROL IN RESIDENTIAL APPLICATIONS
coolingheating Domestic hot water
3 functions: Unique concept in the EU market
“All-thermal” functions embedded: heating, domestic hot water, cooling = all year comfortOr“Alternative thermal” system, friendly for the environment, using renewable energy sources
Main product functions
Why an ATW Heat Pump
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Benefits for the End-User• General
– Only one energy supply needed (single invoice)– Comfortable heating system
• Compared to gas/oil– No risk for gas or oil leaks, no risk for CO contamination– Improved installation possibilities (no combustion ventilation, no
combustion exhaust gas evacuation, no oil storage)– Possibility of cooling
• Compared to direct electrical heating– Efficiency 2 to 4 times higher– More capacity available for same power input
• Compared to geothermal heat pumps– No expensive drilling or excavation works, small installation
footprint outdoors
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ATW Heat Pump Overview
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Daikin Altherma™ - THE 3 IN 1 GUARANTEE – FOR ABSOLUTE COMFORT
Daikin Altherma™ is a unigue system that heats, produces domestic hot water and can even cool spaces. Altherma™ offers maximum year round comfort.
The air/water heat pump is an interesting alternative for classic gas or fuel oil heating that offer unique benefits:
Uses renewable energy sources (extracts heat from outside air)Delivers considerable savings in energy costsDelivers a significant contribution in the fight against CO2 emissionsProvide heating, cooling and domestic hot water
Outdoor Heat Pump Indoor Unit (Hydro Box)
Solar KitDomestic Hot Water Tank
User Interface
Room Thermostat
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Floor heatingWater temp: 30~35°C~40
86~95°F~104
Ideal concept for a new houseDaikin Altherma Split Type Overview
Size of house:
HE / (CO) (*)
HE / CO
Solar kit =
interface between solar panel and Altherma domestic hot water tank
Domestic hot water tank
Stainless steel
3 sizes: 150, 200, 300 l(40, 53, 79 gallon)
(*) floor cooling has limited capacity (approx 20 W/m²)
HYBRID system in combination with ALTHERMA
120 to 180 m²1292 to 1938 ft²
Hydro-Box
Solar Kit
Outdoor Unit
blank
Domestic Hot Water Tank
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Daikin Altherma LT Monobloc Overview
Solar collectors
Room thermostat
Fan coil unit
Under floor heating
Outdoor unit Domestic hot water tank
LT radiator
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Comparison LT Split – LT Monobloc
Altherma LT Split Altherma LT Monobloc
Heat pump typeOutdoor (compressor) + Indoor (hydronic parts)
Outdoor only (compressor and hydronic parts combined)
R-410A refrigerant piping
Between outdoor unit and indoor unit
Inside the outdoor unit
H2O piping Between indoor unit and heating emitters
Between outdoor unit and heating emitters
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T ambient77°F/25°C
-4°F/-20°C
Heating mode
77°F/25°C 122°F/50°C
Hydrobox Leaving Water Temperature
T ambient109°F/43°C
59°F/15°C
Cooling mode
45°F/7°C 68°F/20°C
Hydrobox Leaving Water Temperature
T ambient
95°F/35°C
-4°F/-20°C
Sanitary mode
77°F/25°C 194°F/90°C
Sanitary Tank Outlet Temperature
109°F/43°C
122°F/50°C
Boosterheater
Operating range
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Return water
Leaving water from Heat pump
Domestic hot water tank design
• Optimal placement of:
1. Heat exchanger,2. Temperature sensor
&3. Booster heater
• Control strategy
– Next slide
Sensor
BoosterHeater
Heat Exchanger
DHW tank maximizes energy savings & warm water capacity
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Domestic hot water control strategy• DHW priority setting can be adjusted• Powerful DHW mode : both heat pump and booster heater are
in operation for quick hot water preparation• Booster heater control :
– Adjustable delay timer : allow heat pump to heat up the water as high as possible (118.4 -122°F) before operating the booster heater
– Booster heater priority : simultaneous operation of back-up heater and booster heater can be disabled, booster heater has priority
– Scheduled timer : booster heater operation can be controlled by scheduled timer
• Comfort settings : – Max DHW running time : maximum continuous operation in DHW mode
(to avoid cooldown of rooms)– Anti-recycling time : minimum time between two successive DHW
operations (to allow recovery of temperature in heated rooms)• Thermal disinfection mode
– Heat up the tank daily / weekly to avoid bacteria infection (default setting 158°F)
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Domestic hot water recovery times
Daikin Altherma™ DHW Recovery Times (minutes)
Capacity BTUH 50 gal (220 l) Tank 80 gal (300 l) Tank
(036) 36000 55 89
20 Minute Booster Heater Delay 48 74
(036) 46,000 w/Booster Heater (3kW) 43 70
(048) 48000 45 6520 Minute Booster Heater Delay 37 59
(048) 58,000 w/Booster Heater (3kW) 34 55
(054) 54000 37 5920 Minute Booster Heater Delay 34 53
(054) 64,000 w/Booster Heater (3kW) 31 51
Recovery times based on 80°F/44.5°C ΔT
Booster heater delay default setting is minimum 20 minutes (Maximum is 95 minutes)
Static Recovery Times (47°F/8°C outdoor ambient)
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ATW Heat Pump Technology
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Heat generation by heat pumps
No heat “generation”, only move heat from the outside to the inside.
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Heat pump principle
Comp
Eva
po
rato
r
Co
nd
enser
Expansion valve
Electric power
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No heat “generation”, only move heat from the outside to the inside.
Heat Pump ConceptCapture heat from the outside air and transfer it to the inside of the building.
Example:48,000 BTU heat pump will use 27.97 amps @ full load
ERLQ048/ EKHBX054Producing 50,700 BTU of heat @ 54ºF/12°C outdoor w/ 113° LWC
( 44.8 kBTU at 45ºF/7°C outdoors) ( ( 31.6 kBTU at 19ºF/-7°C outdoors) 65.8% of Rated Capacity
Electric heat of 51,182 BTU or a 15kW heat strip@ 230 volts would consume 65 amps
Electric Heat uses 2.33 times the power
Which is more efficient, Creating the heat energy or just bring it inside???
CO2 emissions - 0
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Compressor Technology
DC – Digitally Commutated Inverter Drive
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Multiple Step Control Standard HVAC system
1 to 2 stages of capacity Uses mechanical unloading techniques
VRV uses inverter technology Electronic inverter varies compressor rotational speed in steps
50% 100% 52~210HzCompressor capacity Applied frequency
Lo
ad
Lo
ad
Unloader, Two Speed orTwo Compressors
Unloader, Two Speed orTwo Compressors
Multi-Step Control PrincipleMulti-Step Control Principle
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Other Inverter Benefits Very low startup amperage No locked rotor amps No stress on windings or compressor frame No “light flicker” Lubrication of bearings increases before speed
increases System pressures increase gradually reducing noise
and stress on piping Quiet compressor startup Idea for backup generator and photo voltaic solar
applications
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No heat “generation”, only move heat from the outside to the inside.
Inrush Current
Altherma Inverter
NonInverter
Current
Time
Running Current
Rush Current
Current
Time
Running Current
When starting up, Inverter raises frequency smoothly, eliminating the rush current.
5 to 6 times RLA
0 amps
132 amps
22 amps
31.9 amps ?
4 amps
0 amps
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Balance Point Strategies• Mono-Valent• Mono-Energetic• Bi-Valent
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System Applications
Covered by heatpump
Hours
100%
Heatpump capacity
Spare heatpump capacity
Coldest day of the year
Mono-valent (heatpump only)
Hea
ting
requ
irem
ent
Heat pump
Hydro box
Radiators/ floor heating
Equilibrium point
Covered by heatpumpCovered by back up heater
90%
10%
Hours
Spare heatpump capacity
Heatpump capacity
Coldest day of the yearH
eatin
g r
eq
uir
em
ent
Mono-energetic (heatpump + heater)
Back up heater*
Heat pump
Hydro box
Radiators/ floor heating
Back up heater is only used below the equilibrium point
*Back up heater is mounted inside the hydro box
100% Heat pump coverage : selection of bigger capacity and
higher investment cost heat pump
Best balance between investment cost and running cost, results in
lowest Lifecycle Cost
Mono-Valent Mono-Energetic
Ideal for New Construction Ideal for New Construction
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System Applications
Bi-Valent
Ideal for Refurbishment/UpgradeSpace Heating with an Auxiliary Boiler
1. Space heating application by either the Daikin Altherma Hydrobox or by an Auxiliary boiler connected in the system.
2. An auxiliary contact decides whether the Hydrobox or the boiler will operate.
3. The auxiliary contact can be an outdoor temperature thermostat, an electricity tariff contact, a manually operated contact etc.
4. Domestic Hot Water in such an application is always produced by the System Tank connected to the Hydrobox, including when the boiler is in operation for space heating.
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ATW Heat Pump Application /Installation
Requirements
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Installation Requirements• Distance between outdoor and hydro-box
(Outdoor & Monobloc).• Distances related to water pipe installation
(Outdoor & Monobloc).• Refrigerant piping (Outdoor).• Attention points on the water circuit.• Installation Examples
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Installation Requirements
To avoid big temperature change when switching from sanitary to cooling ( hot
draft)
To guarantee a minimum temperature difference between outlet PHE and inlet
tank
*Standard minimum 16.4 ft. With factory
charge
10 ft if recharging outdoor is performed.
ERLQ036, 048, 054BAVJU (Outdoor)
246 ft
10 ft*
98.4 ft
10 ft
32.8 ft
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39.4 ft in length.
Installation Requirements
To avoid big temperature change when switching from DHW to cooling ( hot draft)
10 ft
32.8 ft
To guarantee a minimum temperature difference between outlet PHE and inlet DHW tank
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Installation Requirements Required Oil Trap ERLQ036, 048, 054BAVJU
Caution: Requirements for a trap
• Trap installation spacing. A Outdoor unitB Indoor unitC Gas pipingD Liquid pipingE Oil trapH Install trap at each difference in height of 10 m
Install trap at each difference in height of 32.8 ft is required.
Oil trap is not necessary when the outdoor unit is installed in a higher position than the indoor unit.
Since there is a possibility of oil held inside the riser piping flowing back into the compressor when stopped and causing liquid compression phenomenon.
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Installation Requirements Refrigerant Piping Size & Additional Refrigerant Charging
ERLQ036, 048, 054BAVJU ~ EKHBH/EKHBX054BA3/6VJU
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Installation Requirements
Water Circuit
Installation of shut-off valves at inlet and outlet of hydro-box. Installation of drain valves at the lowest placesAir vents at the highest levelAll field piping must withstand the water pressure
Water volume
Minimum water volume– Heating only model: 5.3 gals.– Heating / Cooling model: 5.3 gals.
ERLQ036, 048, 054AVJU + EKHB/EKHX054BA3/6VJU EDLQ/EBLW036,048,054A6VJU
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ATW Heat Pump Interface Control
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Heating/Cooling on/off
Space heating operationSpace cooling operation
DHW heating operation
Silent mode operation
Weather depending control
Temperature setpoint adjusment
DHW water temperature setpoint adjusment
Compressor on symbol
Pump on symbol
Booster heater symbolBack up heater symbol
Controller reference
Remote Controller
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Thank you for your attention
Questions?