The Study On Comprehensive Evaluation Of Cold/heat Source In Large Supermarket In Shanghai

With the entering of large foreign retailing company, large supermarket as the dominate retailing mode develops rapidly in Shanghai in recent years. Its amount increases year after year, and it brings more and more serious energy and environment issues. At the same time, the effect of cold/heat source has aroused the strong attention of the experts in HVAC industry.This thesis calculates the design and dynamic air conditioning load of an actual large supermarket in Shanghai, then presents seven different combination schemes after the investigation of the cold/heat sources for large supermarket in Shanghai. In this thesis many indexes are calculated such as energy consumption, energy ratio, initial investment, annual owning and operating cost, payback period of investment , impact on environment and so on. Finally fuzzy comprehensive evaluation method is used to evaluate the seven schemes. In the end of the paper the conclusions are drawn that the combination of ice-storage (chiller priority) and boiler driven by natural gas is relatively optimum, but the combination of chiller driven by air and air source heat pump can be the best scheme on condition that the large supermarket is lack of chiller plant or water. However direct-fired absorption chiller driven by natural gas will has the great development promise for its lest environmental effect in the future, and electric boiler is not to be recommended because of its disadvantage on the aspects of technology and economy. Considering that heating is not used in many large supermarkets in Shanghai and other southward regions, chiller is evaluated alone by fuzzy comprehensive evaluation method, and another conclusion is reached that the conventional centrifugal chiller and screw chiller are still in advantageous position.