Energy Conservation

7/21/2019 Energy Conservation

http://slidepdf.com/reader/full/energy-conservation-56def1223115a 1/11

ENERGY CONSERVATION IN MINI SPLIT AIR CONDITIONERS

[1] Mir Aqueel Ali*

Email – [email protected]

Associate professor,

Mobile - !1!"#1$%#!%#

[#] &ar'e( a)*an

Email – par'e(a)*an##@)mail.com

Assistant professor,

Mobile - !1!$$1+%1#

[1] [#] / 0 olle)e of En)). &usa2.

mailto:[email protected]

mailto:[email protected]



Abstract

Energy savings in a mini split air conditioner includes correct sizing of AC, purchase, better

installation and operation coupled with reduction in cooling loads. The design options for

substantial energy saving are related to increase in heat transfer area, heat transfer

coefficient, fan, ECM motor and compressor. The cyclic changes should be cared for using variable speed compressors along with electronic expansion valves. efrigerants !"#a,

!#$c may re%uire replacement. The future AC will have better compressor and heat

exchangers for improved performance.

Keywords – Ener)y, mini split, Air con2itioner, 3&, EE4.

INTRODUCTION

Air con2itioner 5A6 market in 7n2ia is 2ominate2 by room As, *hich make up nearly !!8

of the annual sales. 4oom air con2itioner 2eman2 is )ro*in) rapi2ly at rate of #8 on

a'era)e per year o'er the last ten years. 9ith risin) incomes an2 urbani(ation, fallin) A prices, an2 a hot climate, it is e:pecte2 that the A o*nership is )oin) to rapi2ly increase in

7n2ia. &ha2ke et.al. [1] ha'e estimate2 the electricity 2eman2 from As to increase to #!

;9h<yr by #, *hich translates to a peak 2eman2 contribution of about 1" =9. Meetin)

this 2eman2 requires construction of nearly ne* coal fire2 po*er plants of % M9

each. ;he efforts to accelerate the a2option of efficient As can lea2 to re2uction of the A

2eman2 by more than "8 cost effecti'ely> this translates to a'oi2in) buil2in) more than 1

ne* po*er plants. ;he 4oom A market is increasin)ly 2ominate2 by split As. 7n the

financial year #11-1#, split units accounte2 for +%8 of the total room A sales, *hile the

*in2o* units accounte2 for the remainin) #%8. Minimum Ener)y &erformance ?tan2ar2 an2

ma:imum efficiency labels of the 7n2ian room As, ho*e'er, are si)nificantly lo*er than

that compare2 *ith other countries. 3becti'e of this paper is to 2iscuss the 'arious factors

responsible for ener)y conser'ation in mini split air con2itioners.

SIING O! AC"

3ne shoul2 )o for coolin) loa2 calculation in or2er to arri'e for appropriate si(e2 A. A lar)e

si(e2 air con2itioner penali(es in the follo*in) *ays

5i67t uses more ener)y.5ii6.7t costs more to purchase than appropriate si(e A.5iii6.;he

o'ersi(e2 A cycles 5on an2 off6 more frequently re2uce its efficiency. requent cyclin)

makes in2oor temperature to fluctuate more an2 results in less comfortable climate. 7t also

inhibits 2ehumi2ification. 7t, in a22ition *ears out the compressor an2 electrical parts more

rapi2ly. [#]

PURC#ASE



;o2ayBs A uses less ener)y to pro2uce same amount of coolin) as 'inta)e A use2 t*o

2eca2es earlier. ;hus replacement is an option for ener)y sa'in). &urchase ener)y star

qualifie2 A *hich consumes less ener)y than to2ayBs con'entional mo2els. 7ts hi)her cost

*ill be pai2 2urin) its life span. &urchase an A *ith Ener)y sa'in) features such as i6

Ci)ital rea2out for thermostat settin), ii6 A built in timer, iii6 A filter that sli2es out easily for

re)ular cleanin). []

INSTALLATION

5i6Docate the in2oor unit near the centre of room on sha2iest si2e of north or east facin) *all.

Cirect sunshine on con2enser 2ecreases efficiency by as much as 18.5ii6 Minimi(e air

leaka)e by fittin) the 2rain pipe an2 tubin)Bs snu)ly into its openin) an2 sealin) )aps *ith

aulk 5special sealants6.5iii6 ;he use of lon)er tube len)th an2 more ben2s bet*een the

in2oor an2 out2oor increase ener)y consumption. Don)er tube len)ths require hi)her

refri)erant char)e.5i'6 Most ;F sensin) bulbs are installe2 *ith no insulation an2 improper

contact an2 orientation. 7n these con2itions, shuntin) may arise 5rapi2 openin) an2 closin) of

the 'al'e6 an2 harm the compressor *hile allo*in) liqui2 to enter the compressor in those

con2itions resultin) in increase po*er consumption.

OPERATION

5i6?et A thermostat settin)s properly, A uses to % percent less ener)y for each 2e)ree set

abo'e ##G, therefore set the thermostat as hi)h as is comfortably possible in summer 5#%-

#+Gc6 [" ].5ii6an spee2s are a'ailable in # or options. ?et the fan spee2 on hi)h, e:cept on

'ery humi2 2ays. 9hen humi2ity is hi)h set the fan spee2 on lo* for more comfort. onsi2er

an interior fan in conunction *ith A to sprea2 the coole2 air more effecti'ely throu)h the

room *ithout )reatly increasin) electricity use. Hsin) fan allo*s one to set the thermostat

temperature hi)her an2 thus re2uces the ener)y consumption.5iii6 ConBt place lamps near A

thermostat. ;his may cause the A to run lon)er.

MAINTENANCE

5i6;he air filter, con2enser an2 e'aporator coils shoul2 be re)ularly cleane2 *ith a blo*er.

?ome units also control the air flo* passa)e of the in2oor unit by measurin) the pressure

loss to *arn en2-users *hen it is necessary to clean the filter. A % star A *ill be re2uce2

to a star in %- I 2ays a 1 star in 1- 1# 2ays if filter cleanin) is o'erlooke2.5ii6

Hse a fin comb to strai)hten the bent fins on e'aporator an2 con2enser coil.5iii6 7n case of

refri)erant leak e'acuation shoul2 be 2one by 'acuum pump instea2 of compressor, use2

by mechanics. Hse of 'acuum pump ensures 2ehy2ration an2 remo'al of non

con2ensable )ases *hich may other*ise increase con2enser an2 e'aporator temperature.



;his is in turn increases ener)y consumption.5i'6 4efri)erant char)e shoul2 be optimum.

/oth un2er char)in) an2 o'erchar)in) increase ener)y consumption.

COOLING LOAD REDUCTION

5i6 7f possible )o for passi'e coolin) in the buil2in) before construction.5ii6 7nstall *in2o*

sun sha2e, storm *in2o*s, blin2s or 2rapes in front of )lass, storm 2oor, 2ouble or triple

pane *in2o*s.5iii6 ;he cool roof, attic, floor an2 *all insulation *ill re2uce the coolin)

loa2 by 1%8.5i'6 Hse compact fluorescent lamps 5D6 an2 fi:tures *hich consume

appro:imately #%8 of electricity as compare2 to similar incan2escent lamps an2 has $ to

1 times lon)er life.

DESIGN OPTIONS

704EA?E JEA; ;4A0?E4 ?H4AE A4EA

1. 7ncrease rontal oil Area, #.7ncrease Cepth of oil, .7ncrease fin 2ensity, ".A22 sub cooler

to con2enser coil.

704EA?E JEA; ;4A0?E4 3E77E0;?

1. 7mpro'e fin 2esi)n, #. 7mpro'e tube 2esi)n, .Jy2rophilic film coatin) on fins, ".7mpro'e

fan an2 fan motor efficiency

M743 JA00ED JEA; EJA0=E4?

7M&43FE 3M&4E??34 E77E0K

KD7 JA0=E?

1. Fariable spee2 compressor, #.Alternati'e refri)erants, . Electronic E:pansion 'al'es,

3;JE4 D3??E?

1. ?i2e lou'er, #.Cischar)e air recirculation heat loss, .?uction heat )ain, ". 4e'ersin) 'al'e,

%. E'aporati'e coolin).

I$crease %ro$ta& co'& area

Enhancin) frontal area in either of the coil results in increase2 efficiency of the entire system.

7n or2er to ha'e a2equate 2ehumi2ification at least #%8 of the capacity shoul2 be allotte2 for

2ehumi2ification. ;he increase in frontal coil area impro'es e'aporator performance thereby

increasin) e'aporatin) temperature. ;he frontal area of coil cannot be increase2 beyon2 a

limit because it increases cabinet si(e.

I$crease de(t) o% co'&

Fertical tube ro*s may be at the most because each successi'e ro* in a coil is only +8

effecti'e as prece2in) ro*. or systems *orkin) *ith 4-"1A, the tren2 is to use number of

ro*s to # or ro*s an2 for 4-"+, it is possible to take a2'anta)e of the temperature )li2e



by usin) a confi)uration *ith more than ro*s. A22ition of hori(ontal ro* is limite2 by

chassis si(e, issue of *ei)ht an2 refri)erant char)e.

!'$ de$s'ty o(t''+at'o$

Cominant heat transfer resistance is usually on the air-si2e. in 2ensity shoul2 be optimi(e2

*ith re)ar2s to impro'ement in heat transfer, effect on fan po*er> *ater 2raina)e an2 2irt

buil2 up. ;he fin 2ensity is a function of type of coil 5e'aporator or con2enser6, fin type

5*a'y, lou'ere2, enhance26, number of tube ro*s an2 tube 2iameter. urrent fin 2ensities are

aroun2 +<cm.

S,b coo&er

A sub cooler can be a22e2 bet*een con2enser outlet an2 capillary inlet. ;he a22ition of sub

cooler *ill increase the si(e of con2enser coil. ;he a22ition of sub cooler may be possible if

a2equate area is a'ailable other*ise the si(e of air con2itioner *ill increase thereby resultin)

in increase2 initial cost. ;he increase in Ener)y Efficiency 4atio 5EE46 may be 1." to 8

for 'arious capacities.

I(ro-e %'$ des'.$

Enhancements to the fin 2esi)n ha'e the effect of impro'in) coils airsi2e heat transfer

coefficient thereby impro'ement in o'erall heat transfer capability of coil. ;he

impro'ements are partly 2ue to increase2 air turbulence o'er coil cause2 by enhance2 fin

2esi)n. ;he fin impro'ement can be achie'e2 by usin) a corru)ate2 or *a'y fin pattern or a

lou'ere2 or lance2 fin pattern. 4ecent pro)ress also inclu2es 2ecrease of the fin thickness.

;he fin thickness is aroun2 .1mm.

I(ro-ed t,be des'.$

;he refri)erant si2e heat transfer coefficient *ith )roo'e2 tubin) is )reater than that for

smooth tubin). 7mpro'ement of refri)erant heat transfer coefficient *ith )roo'e2 tubin) is a

function of *i2th, hei)ht an2 spacin) of )roo'es as *ell as oil concentration *ithin the

refri)erant. ;he effect of refri)erant pressure 2rop shoul2 be optimi(e2. 7n or2er for the heat

e:chan)e increase not to be too 2etrimental to the refri)erant pressure loss in the heat

e:chan)ers, the 2iameter of the copper tube is a2apte2 to the refri)erant con2itions, *ith

lar)er 2iameters for the )as state an2 lo*er 2iameters for liqui2 or t*o phase con2itions.

;hese measures also enable to 2ecrease the refri)erant char)e resultin) in lo*er po*er

consumption. ;ube 2iameters currently use2 are +mm.;he system performance 2ue to

2ifferent heat e:chan)er fin an2 tube 2esi)ns 2ata from hinese te:ts on air con2itioner

technolo)y is )i'en in ;able 1 *hich summari(es the heat transfer an2 pressure 2rop

enhancement factors. ;he enhancement factors are relati'e to flat fins an2 smooth tubin) 5i.e.,



flat fins an2 smooth tubin) ha'e heat transfer an2 pressure 2rop enhancement factors of 1.6.

;he 'alue use2 for the heat transfer enhancement factor is the multiplication factor for air-

si2e heat-transfer coefficient of the coil. [%]

;able 1 Jeat transfer an2 &ressure 2rop

Enhancement factor

DesignJeat ;ransfer

Enhancement

actor

&ressure

2rop

Enhancement actor

EVAPORATOR TUBE

9a'y in smooth 1.1# 1.%

?lit in smooth 1.% 1.#

?lit in )roo'e 1.$ 1.#

=roo'e #." 1.%

CONDENSOR TUBE

9a'y in smooth 1.11 1.%

?lit in )roo'e 1."" 1.#%

?lit in )roo'e 1.%+ 1.#%

=roo'e #.# 1."

#ydro()'&'c / %'& coat'$. o$ %'$s

;he formation of *ater con2ensate upon the heat e:chan)er fins causes a bri2)in) effect

bet*een the fin spacin). ;his results in a 2ecrease in the heat transfer performance as *ell as

an increase2 2rop in air pressure. ;he a22ition of the hy2rophilic coatin) on the heat

e:chan)er fins re2uces the thickness of the con2ensate layer an2 enables an increase2 ability

for the *ater to 2rain off the fins allo*in) a re2uce2 air si2e pressure 2rop an2 an increase2

airflo* across the heat e:chan)er. ;he aluminum fins *ill not corro2e 2ue to separation of

*ater 2roplets. 7n the H? it has been sho*n that the use of such a hy2rophilic film coatin) on

the heat e:chan)er fins can re2uce the pressure 2rop bet*een #-%8 *hen operatin) in hi)h

humi2ity room-si2e air en'ironments. ;herefore coolin) capacity is impro'e2 as compare2 to

air con2itionin) systems usin) untreate2 fins.

!a$ 0 %a$ otor

;he e'aporator fan is usually a blo*er *heel 5centrifu)al for*ar2 cur'e2 fan6 *hile

con2enser fan is propeller type2. ;he e'aporator an2 con2enser fan motor consume 8 an2+ respecti'ely of total ener)y consumption of room A. &ropeller fans pre'iously ma2e of

processe2 metals, are no* ma2e of plastics. ;he shape of bla2e must be such that it shoul2

increase the 'olumetric efficiency an2 2ecrease the noise le'el. 3pportunities for conser'in)

ener)y are also a'ailable by impro'in) the efficiency of air 2eli'ery system an2 fan motor. 7n

a22ition, impro'in) fan motor efficiency results in a22itional compressor ener)y sa'in).

Earlier fan motors *ere of lo* efficiency sha2e2 pole type2 but no* permanent split

capacitor 5&?6 motors ha'in) efficiency in the ran)e of %8 to I are use2. Electronically

commutate2 motors 5EM6 ha'e the efficiency in ran)e of + to $8. 7n an EM po*er is



pulse2 on an2 off electronically. /y 'aryin) the timin) an2 2uration of pulses, the electronic

controller can accomplish spee2 control as *ell as maintain hi)h torque at the start an2 o'er a

broa2 spee2 ran)e. [I] ;he cost of EM is #.% to % times more an2 EE4 increases by ." as

compare2 to &? motors.

M'cro c)a$$e& )eat e1c)a$.ers

Micro channel heat e:chan)ers are smaller an2 yet ha'e the same performance as a

con'entional heat e:chan)er, in other *or2s impro'e2 performance in same 'olume as that of

con'entional heat e:chan)er. ;he smaller si(e of the e:chan)er re2uces refri)erant pressure

2rop, impro'in) o'erall compressor performance. Jo*e'er, micro channels also ha'e

*eaknesses, such as lar)e pressure 2rop, hi)h cost of manufacture, 2irt clo))in), an2 flo*

mal-2istribution, especially for t*o-phase flo*s. ?maller con2enser *ei)ht an2 refri)erant

char)e in micro channel heat e:chan)ers re2uce the thermal mass of the heat e:chan)er, an2

therefore contribute to better seasonal performance. Atthakorn haikhumrop an2 9orrasi2

;rutassana*in [+] performe2 the test on split type air con2itionin) unit *ith a coolin)

capacity of 1$, /tu<hr. the results sho*e2 that as the con2enser air inlet temperatures

increase2 from %o to $o an2 to "#o, the effecti'eness of microchannel con2enser *ere

hi)her than those of fin-an2-tube con2enser by .II8, %.I%8, an2 .I"8, respecti'ely. ;he

EE4s of the split type air con2itionin) system *ith the microchannel con2enser *ere hi)her

than those of the system *ith the fin-an2-tube con2enser as the con2enser air inlet

temperatures *ere increase2 from %o to $o an2 to "#o by 1.1"8, .$8, an2 #.$8,

respecti'ely.

I(ro-ed co(ressor e%%'c'e$cy

ompressors are the heart of refri)eration system. Ener)y consume2 by the compressor has a

lionBs share in air con2itioners total ener)y. ompressor efficiency is impro'e2 throu)h the

use of hi)h efficiency motors, hi)h )ra2e materials in the pumpin) mechanism combine2

*ith a2'ance pro2uction metho2s an2 equipment. &ro)resses ha'e been ma2e to re2uce

friction losses in rotary compressors. ;he ?*in) compressor manufacture2 by Caikin has the

roller soli2ari(e2 *ith the bla2e> this a'oi2s leaka)es bet*een hi)h an2 lo* pressure si2es.

;he compressor has 1% 8 hi)her )lobal efficiency. 3ther manufacturers 5;oshiba, uitsu,

?anyo6 ha'e a2opte2 a rotary compressor *ith t*o sta)es or t*in rotary compressor that

enables to impro'e the efficiency by 1 8. [$] A2'anta)es of scroll o'er reciprocatin) are 1

Ji)hest 'olumetric efficiency- appro:imately 18, 18 to # hi)her EE4, # Do* soun2

characteristics- appro:imately % 2ecibels lo*er than reciprocatin), ?moother an2 continuous

compare2 to rapi2 piston mo'ement *hich ensures lo* 'ibration an2 lo*er 2ischar)e pulse



3utstan2in) reliability *ith re)ar2s to lo*er failure rate an2 tolerance to liqui2 refri)erant as

*ell as 2ebris. [!] Ce'elopments of linear compressors for air con2itioners *ill be able to

2ecrease motor losses an2 increase compression efficiencies. Jo*e'er, no linear compressor

is presently commercially a'ailable for air con2itioners.

Var'ab&e s(eed co(ressors

A compressor *orkin) *ith 'ariable spee2 motor an2 its spee2 mo2ulate2 to match the loa2

offers the a2'anta)e of substantial re2uction in po*er consumption an2 increase in EE4 by

1.#.Fariable spee2 compressor matches the loa2 in a room. A2'anta)es of 'ariable spee2

compressors are 5i6 Luieter 3peration at lo* spee2s.5ii6 Enhance2 comfort by eliminatin)

lar)e fluctuations in room temperature. ;he control of 'ariable spee2 compressors is

accomplishe2 throu)h the use of electronic A?C at the motor. /ecause electronic A?C are

compact an2 2o not ha'e to be mechanically couple2 to motor, they can be applie2 to

fractional si(e motors of room As. 7n'erter base2 A?C are common for in2uction motors

*hile con'erter base2 A?CBs are use2 for EM motors. A?C perform *ell both *ith rotary

an2 scroll compressors. ;he maor benefits of the in'erter air con2itionin) system o'er a

con'entional air con2itionin) system inclu2e e:cellent thermal comfort, noiseless, an2

precise controllability. 7n a22ition, an in'erter-2ri'en con2itioner pro'i2es not only precise

capacity mo2ulation, but also ener)y conser'ation. [1] Althou)h more efficient than sin)le

spee2 systems at full loa2 con2itions. /ecause of parasitic losses associate2 *ith the

electronics require2 to operate 'ariable spee2 compressor, they may actually 2ra* more

po*er at full loa2 con2itions. ;hus, 'ariable spee2 systems may e:acerbate peak po*er

concerns for electric utilities.

A&ter$at'-e re%r'.era$ts

urrently, the main refri)erants use2 in househol2 air-con2itioners are 5Js6

hy2rochlorofluorocarbons, particularly 4-##, an2 5Js6 hy2rofluorocarbons, mostly 4-

"1A. ;here are t*o approaches to the replacement of Js at present one is the use of

Js an2 the other is to use hy2rocarbon 5J6 refri)erants. At present, the most common

internationally-applie2 alternati'e for room air con2itioners is J 4-"1A> ho*e'er this

refri)erant has a hi)h =lobal 9armin) &otential 5=9&6 of #$$. =i'en the current concerns

an2 increasin) 2eman2s for protection of the climate, hi)h =9& alternati'es are facin)

elimination in the me2ium to lon)-term. ompare2 *ith Js an2 Js, J refri)erants

offer (ero 3C& an2 ne)li)ible =9& an2, in re)ar2 to their performance, they offer in )eneral

hi)h efficiency, re2uce2 char)e si(es, )oo2 miscibility *ith mineral oils, lo*er compressor

2ischar)e temperatures, an2 better heat transfer *ithin heat e:chan)ers.4-#! an2 4# are



also alternati'es for 4-##.7n 7n2ia =o2re 7n2ustries no* sells split systems *ith 4 #! an2

Caikin an2 &anasonic offers split systems *ith 4#.Another Alternati'e 4 "+ can be use2

2rop in substitute.

E&ectro$'c e1(a$s'o$ -a&-es

As compare2 to capillary the thermostatic e:pansion 'al'es 5;F6 can a2apt better to

chan)es in operatin) con2itions such as those 2ue to 'ariation in ambient temperatures, *hich

affect the con2ensin) temperature. ;F can lea2 to small 'ariations aroun2 the set point

2epen2in) on the e'aporatin) pressure. Moreo'er, at 'ery lo* loa2, there are stability

problems that may lea2 to the shuntin) of the 'al'e an2 si)nificant ener)y losses. ;he

electronically controlle2 e:pansion 'al'e enables a correct an2 a2aptable le'el of throttlin)

base2 on electronic si)nalin) from a micro-computer *hich 2etermines the air con2itioner

operatin) state. A pulse motor fe2 by an electronic si)nal is use2 to control the 'al'e, *hich

in turn controls the 2e)ree of throttlin). ;his enables the efficient control of the refri)erant

flo*, 2epen2in) on the operatin) state. ;he operatin) characteristics are similar to the ;F

e:cept for the increase2 precision achie'e2 by the electronic 'al'e *hich in turn enables

lo*er superheat 'alues an2 the ability to o'ercome the limits of the ;Fs thermo-mechanical

2esi)n. As is the case *ith the 'ariable spee2 compressors, the key benefit of electronic

e:pansion 'al'es is the impro'ement of seasonal ener)y efficiency. An a22e2 benefit of the

electronic e:pansion 'al'e 5as *ith ;F *ith hermetic closure6 is the capability to stop

refri)erant mi)ration un2er on<off cyclin) or *hen the unit is off.

Ot)er &osses

'2 s'de &o,-ers

?i2e lou'ers ha'e a si)nificant impact on unit performance. ?i2e lou'ers separate the

airstreams to an2 from the con2enser an2 re2uce recirculation an2 enhance the mo'ement of

air o'er the out2oor coil. Hnits *ithout si2e lou'ers operate at a lo*er efficiency 2ue to

a22itional compressor po*er 5aroun2 "86 require2 for compensatin) the 2ecrease2 air flo*

o'er the con2enser coil.

''2 D'sc)ar.e a'r rec'rc,&at'o$ )eat &oss

?hort circuitin) of 2ischar)e air into the A re2uces heat content of the mi:ture, thereby

re2ucin) capacity 5aroun2 I86. ;he EE4 2ecreases since the ener)y input is same.

'''2 Re-ers'$. -a&-e

A re'ersin) 'al'e allo*s a room A to operate as a heat pump an2 pro'i2e space heatin) in

a22ition to coolin). ;he re'ersin) 'al'e a22s an a22itional loa2 to the system that increases

the unitBs po*er requirement by an estimate2 %8.



'-2 S,ct'o$ &'$e )eat .a'$

7t takes places 2ue to motion of refri)erant from in2oor to out2oor section an2 hence

capacity 2ecreases. ;he heat )ain can be re2uce2 by better insulation on suction line.

- E-a(orat'-e coo&'$.

A problem relate2 *ith application of air con2enser in hot *eather con2itions 5about %oc6 is

relate2 to the hi)h storeye2 buil2in)s. 7n these buil2in)s the hot air from air con2itioners of

lo*er story rises up an2 pro'i2es a hot flo* fiel2 aroun2 the air con2itioners of hi)her

storeye2. ?ometimes, the increase in the air temperature is so hi)h that the air con2itioner trip

2o*n. 7mpro'ement of system performance in a split-type air con2itioner *ith 'arious types

of in2irect e'aporati'e coolin) systems *as e:perimente2 by hainaron) haktranon2a, an2

&eachrakha Coun)son)a [11], the conclusions are

5i6. Ambient temperature has much influence2 the po*er consumption of compressor an2

3&. 9hen ambient temperature is raise2 by 1O, electrical po*er consumption increases by

aroun2 "8. 5ii6. Cue to hi)h contact surface bet*een *ater an2 air-stream, the e'aporati'e

coolin) system usin) spray *ater cooperatin) *ith cellulose coolin) pa2 can 2ecrease the

po*er consumption by aroun2 1%8, an2 can increase 3&4 up to "%8.

Co$c&,s'o$

;he 'arious metho2s of ener)y conser'ation are 2iscusse2. ;he 2esi)n a2option 2epen2s

upon mo2ification cost an2 ener)y sa'e2. 7mpro'ement in compressor EE4 may be the first

priority follo*e2 by use of better heat e:chan)ers. 3ur nation has taken a *elcome step by

impro'in) /EE star label for room A compulsory from Nanuary #1".

Re%ere$ces

[1] 0ihar ?hah, &aul 9ai2e, Amol &ha2ke oolin) the &lanet 3pportunities for

Ceployment of ?uperefficient 4oom Air on2itioners D/0D-

&'( onsumer ener)y information Ener)y efficiency an2 rene*able ener)y net*ork

fact sheet.

&)( 4oom air con2itioner ener)y efficiency an2 rene*able ener)y.&!( =ui2e on ener)y efficient 4oom air con2itioner.

&*( ;echnical an2 economic analysis of ener)y efficiency of hinese room air

con2itioner, +ebruary '##" - !***/ ,'0

&1( /rushless C motors ;rane En)ineers 0e*sletter 'olume–"

[+] Atthakorn haikhumrop an2 9orrasi2 ;rutassana*in, ?tu2y, an2 ;estin) of a ?plit-

;ype Air on2itionin) Hnit by Hsin) Microchannel on2enser ;he ?econ2 ;?ME

7nternational onference on Mechanical En)ineerin) 3ctober 1!-#1, #11, Orabi

[$] &reparatory stu2y on the en'ironmental performance of resi2ential room con2itionin)

appliances 5airco an2 'entilation6 Craft report of ;ask I Nuly #$

[!]?croll compressors presente2 by 2irlos2ar Copeland ltd. at national conference on

AC, Chennai.



[1] 7n) Koun hen, K.M. hen, .?. 9ei , .. 9an) , A comparati'e stu2y bet*een a

constant-spee2 air-con2itioner an2 a 'ariable-spee2 air-con2itioner. ashrae transactions

an #!

[11] hainaron) haktranon2a, an2 &eachrakha Coun)son)a An E:perimental

E'aluation of Ener)y ?a'in) in a ?plit-type Air on2itioner *ith E'aporati'e oolin)?ystems #1 7nternational ;ransaction Nournal of En)ineerin), Mana)ement, Applie2

?ciences ;echnolo)ies Folume 1 0o.1. e7??0 1!I-!I"#

Energy Conservation

Documents

Transcript of Energy Conservation