Recyclable HeatNames: Amanda Chia Wan Ying, Mok Hui MinSchool: Chemical and Biomolecular ngineering!utor"s Name: #r Carmel Heah#ate o$ Submission: %%&'(&)'%*BackgroundWater heaters and air conditioners are highly energy consuming and environmentallyunfriendly, yet widely used appliances in Singapore. An average family requires 3000 KWHof electricityper year forwaterheating!", releasing#000l$sofgreenhousegases. Heatenergylost fromair%conditioners which accounts for &0'of energyconsumption("in$uildings is completely lost to the environment. )f waste heat energy from air conditionerscan $e recycled for water heaters, much energy and cost can $e saved.+roblem*urrent measurestorecycleheat includethe+wasteheat recovery$oiler,andtheuseofchiller plants. However, the former requires a lot of equipment and space. -hus, it cannot $eused on a large scale in Singapore.3" -he latter ma.es use of the change in seasons and thuscannot$eusedinSingapore./"-hus, thedevelopment ofarecycla$leheat systemthat isfeasi$le in Singapore0s climate is needed. SolutionWepropose $uilding +Waste Heat 1ecovery 2nits, that channel waste heat fromairconditionerstowaterheatersinthesame$uilding. -herefrigerant compressoroftheairconditioner will $e connected to a system of pipes that allows the transfer of heat energyusing 3reon 4a volatile coolant5 from air conditioners to water heaters instead of releasing itas waste heat.

3igure !6 7iagram of how +1ecycla$le Heat, will wor. in hotels6 8ath of 3reon 8ressured andheated hot 3reon9apour*ondenser : water heaterCom,ressorHigh 8ressured *ool ;iquid 3reon-,ansion .al/eHeated ;ow 8ressured 3reon 9apour*ooled 3reon travelling as ;ow 8ressure *ool ;iquid7istri$ution of heated water Air *onditionerShowerBene$its-his allowsfor significant reductioninenergyconsumptionasenergyonlyneedsto$egenerated once to power $oth air conditioners and water heaters. 3urthermore, heat can $erecycled from the use of appliances in%situ, reducing the loss of heat energy $y allowing heatto $e transferred $etween appliances efficiently.0m,lementationWaste Heat 1ecovery units can $e first used at small hotels due to their wide usage of air%conditioners and water heaters. 3eed$ac. on whether the heat generated $y air conditionersheats the water sufficiently can $e gathered. Cost1BudgetS5! )nstallation of 8iping and valves&000(. *ondenser and Water Heater&0000/.8umps(0000&.?aterials and Supplies 4e.g. fittings, fasteners and mounting hardware5 &000-otal@0000ConclusionWith the wide usage of air%conditioners in Singapore0s hot and humid environment, recycling waste heat will greatly reduce the car$on footprint. Re$erences!5 ?artin =icholson, 4(00A5. Bnergy in a *hanging *limate.!st ed. Australia61osen$urg 8u$lishing 8ty ;td.(5 Singapore0s Second =ational *ommunication6 2nder the 2nited =ations 3ramewor. *onvention on *limate *hange 4=ovem$er (0!05, =BA35 8etroleum *onservation 1esearch Association 48*1A5, ?inistry of 8etroluem. 3uel Bconomy in 3urnaces and Waste heat recovery. )ndustrial Coo.let &. !AA@/5 Ceyene, A. San 7iego State 2niv. 4!AA&5. 8erformance evaluation of conventional chiller systems.