TABLE OF CONTENTS - The Professional Green Building Council

Theme A: Connecting the Pearl River Delta RegionAccording to equation (1), we can calculate the PER of traditional air-conditioningsystem and river source system. The PER of traditional system is 0.84 in the designcondition. The average PER of river source system is 0.98, which increases 18%.3.2.2 Performance comparison of heating systemsIn winter, the river water will be send into the heat pumps directly. Fig.6 is COPvalue with the change of the river water temperature.COP3.353.303.253.203.153.103.059 10 11 12 13River Water Temperature ℃Figure 6: COP value with the change of the river water temperature in heatingperiodFrom Fig.6, it can be seen that, the average COP is at 3.1 to 3.3. According to theequation (2) (3), we can know the average PER of boiler heating system is 0.4, butthe river water heat pump heating is 0.7 to 0.8, increase 75% to 100%. The energyconservation effect is significant.In the transition season, the average river water temperature is at 14℃ to 19℃.The COP and PER will be higher than them in winter.3.2.3 Performance of free cooling systemIn the winter and transition season, the river water temperature is very low. Whenthe temperature is lower than the refrigeration units allow, the units can notnormally running. At this time, the units will use cooling water recycle in order toincrease the cooling water’s temperature. So the highest COP of the chilled units isabout 5.5, and the highest PER of the air-conditioning system is about 0.99. But for58