TABLE OF CONTENTS - The Professional Green Building Council

Theme A: Connecting the Pearl River Delta Regionthe free cooling program, the COP can be seen as infinite, because there is noelectricity used for refrigeration. And the PER is about 3.36. Energy saving effectis obvious.3.3 Economic evaluationIn the river water source heat pump project, the incremental investment is mainlyat water system and water purification system. The incremental investment is about20% to 40% of the conventional cold and heat source system’s investment.We can estimate the operating cost of the river water source air-conditioningsystem and the traditional system by reference to the other similar air-conditioningsystem’s operating time. After calculation, the river water air-conditioning systemcan save about 116 million RMB every year, nearly 26% cost of the traditionalsystem’s operation. If the boiler gas consumption of the traditional system werechanged into corresponding consumption of electricity, we can find out that theriver water source system can save 195 million Kwh electricity. The rate of energysaving arrives at 33%. It can be seen that the river water source air-conditioningsystem has great energy efficiency through reasonable designed. Fig.7 is the resultof the comparison between these two systems’ annual operating costs.Traditional airconditioningsystemRiver water airconditioningsystem0 100 200 300 400 500 600Operation cost (Million RMB)Cooling in summerHeating in winterCooling in winterTransition seasonFigure 7: The annual operating costs of two systems4. ENVIRONMENTAL EVALUATION59