Study On The Choice Of The Suitable Heating System For Residential Buildings In Hot-summer And Cold-winter Region In China

Conventionally, buildings in hot-summer and cold-winter region of China were notplanned with space heating systems before. However, with the improvement of people’seconomic levels as well as the need of comfort, more and more people are consideringthe issue of building heating in winter in this region. For the best choice from differentheating modes, three problems must be solved: the proper indoor design temperature ofheating system, the comparison of energy consumption of different heating systems andthe comprehensive goodness of different systems.In this dissertation, the confirmation of indoor design temperature is mainlythrough two ways: investigation of subjective thermal sensation and in-sitemeasurement. PMV and PPD model, created by Fanger, were chosen as the evaluationindexes of thermal comfort. By the subjective thermal sensation vote, the neutraltemperature is18.3℃. And by the standard of ISO7730, indoor temperature should bekept in the range of16.7-19.5℃, whereas in the range of17.1-19.7℃according to thein-site measurement.When indoor temperature is lower than17.3℃, the calculated PPD is lower thansubjective PPD, showing that people in this region have already gotten adapted to thelow indoor temperature to some degree. But when higher than17.3℃,calculated PPD ishigher than subjective PPD, showing that in this region, when building is heated, peoplemay not adapt to relatively high indoor temperature. Energy consumption of different heating systems was simulated by Energy Plus.According to the simulation result, the ratio of heating energy consumption of GSHP,coal-boiler, air-to-air conditioner and gas-boiler is1:5.72:1.88:5.34. When converted toprimary energy consumption, the ration is1:2.10:1.86:1.84.Fuzzy comprehensive method was chosen for the evaluation of different heatingsystems. The goal hierarchy includes energy consumption, environmental goodness andeconomic superiority. The main economic index was total annual cost; theenvironmental index was composed by emission rate of NO_X, SO₂，CO, CO₂and othersolid pollutions. The comprehensive evaluation result is: GSHP> gas-boiler> air-to-airconditioner> coal-boiler. But the environmental superiority of gas-boiler is veryobvious as its relative high cleanness for combustion. Economically, the disadvantageof GSHP system in capital cost can be compensated during15years, no matter whichsystem was chosen as a counterpart.