Gas Engine Driven Heat Pump And The Experimental Research

With the practice of the project of "natural gas transmission from west to east" and the demand of multiple utilization of energy, developing the GEHP (Gas Engine Heat Pump) technology in air-conditioning area has important significance. At the same time, it has such advantages as environmental protection, energy-saving, adjustment of the electric network load and so on, so it makes much sense to do some research in this field. The exploratory development on it has been made in this paper. GEHP has much predominance that the traditional EHP(Electrical Heat Pump) hasn't: Firstly, gas is a clean resource and GEHP has much superiority in environmental protection ; Secondly, avoiding the process of the electrical generation in power plant and its transmission to the end, GEHP has higher PER(Primary Energy Ratio) than EHP; Thirdly, GEHP system avoids the "cold blow" associated with EHP by recovering and using waste heat from engine jacket coolant and exhaust; Finally, the engine speed can be easily adjusted to match varying heating and cooling loads and get higher IPLV(Integrate Part Load Value) A GEHP system is designed in this paper, on the basis of which an experiment table has been built to test the system performance. And then the COP of the system, varying speed part load performance, and the recovery effect of waste heat from the engine are analyzed theoretically and experimentally. The system performance with different engine speed is studied in the paper, and the engine power, engine torque and fuel consumption is simulated through the engine performance curve. The IPLV of the GEHP is measured during the experiment by changing the system load and adjusting the engine speed at real time. In the experiment, a secondary water recovery system is set to reclaim waste heat from engine jacket coolant and exhaust, which is a very important part of GEHP. And the relationship between the recovery heat, condensing heat and system fuel consumption under varying working condition is determined by analyzing the recovery system, and the optimal economical efficiency between the heat that the GEHP provides and the fuel consumption is put forward under the mode of heat pump.