| CHP(Combined Heat and Power Plant) is an old and well-known technique for the rational use of energy and it has more than fifty years of experience. The development of BCHP( Building Cooling, Heating &. Power Generation) depend on the CHP, and now the BCHP bas become a quite recent technology . BCHP is powered by natural gas. It can supply the entire building with cooling, heating and electric power, among them the energy source of heating and cooling is the waste heat from power generation. This kind of energy use can effectively realize energy' s stepped utilization, and can acquire higher Primary Energy Ratio (PER).This kind of energy use can also solve the problem of electricity load of large building, increase the power use security, reduce the load of electric network, avoid the power lose caused by long distance electricty transportation , etc.The paper introduced the application, recent development of Gas Air-conditionner and the principle of gas - fired double-effect a lithium-bromide absorption-type refrigerating machine. Base on it, the author analyzed nine kinds of BCHP systems and their advantages and disadvantages of different combination. By choosing some physical concepts , such as Energy Utilization Ratio, Hot Electricity Efficiency and so on, the author illustrated a Gas-Steam combined cycle of heating-cooling-electricity cogeneration system, analyzed the relationships of the unit efficiency with the extraction flow rate, Heat-Electricity Ratio, Energy Saving Ratio . By the increase of the extraction flow rate, the acceleration of the unit efficiency slows down, the maximum mumber of the unit efficiency appear between 20%-50%. After 50 per cent of the unit efficiency, the mumber droppes sharply. Therefore we don ' t depend on the increasing of the Heat-Electricity Ratio to increase the unit efficiency. Based on the analysis of each part of the Exergy Efficiency Ratio and the Exergy Loss Ratio, the author point out the reason of exergy loss, and put forward... |
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