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1、Gas engine driven heat pump applied in the study of waste heat recovery heatingZHANG Liang1,2,3 TIAN Guan-san1,2,3 1 Key Laboratory of Renewable Energy Utilization Technologies in Buildings，Ministry of Education ，Jinan, China2 Shandong Key Laboratory of Building Energy-saving Technique, Jinan, China
2、3 School of Thermal Energy Engineering, Shandong Jianzhu University, Jinan, ChinaAbstract: This paper mainly discusses the recovery and utilization of waste heat of gas engine heat pump heating system, and the establishment of gas engine heat pump heat recovery heating calculation model under differ
3、ent conditions, to analyze the performance of gas engine driven heat pump; thermal conditions in the system of direct recovery of waste heat and waste heat utilization of gas engine heat pump is analyzed, according to the different situation choose the right way, waste heat recovery.0 Working Princi
4、pleUsing natural gas as the energy of the compressed gas heat pump system is the efficient natural gas engine driven compressor cycle to achieve efficient inverse circulation combined cycle system, in which the inverse circulation recyclable positive cycle engine cooling and exhaust waste heat, and
5、can make full use of industrial waste heat, solar energy, geothermal energy and storage in the natural environment of low temperature heat. has obvious advantages( see Figure 1, 2)。Fig.1 The energy efficiency about gas engine heat pumpFig. 2 The energy efficiency about boiler and electric2engine hea
6、t pumpThis design aims to provide a practical and efficient water - water gas heat pump heat recovery device, make full use of gas engine heat pump engine waste heat of flue gas in order to play a high energy utilization technology, raise winter low temperature unit user side temperature of supply w
7、ater, realize water water gas engine heat pump in winter the efficient operation under low temperature conditions.Gas engine waste heat is big, grade is high, utilization of waste heat is fully to the gas engine heat pump performance has significant effect, we should take all kinds of feasible metho
8、ds to fully recover the residual heat from gas engine heat pump driven by gas engine, improving the primary energy utilization rate. In the recycling waste heat of the engine must be noticed when constraints, can not influence the normal operation of the gas engine, waste heat utilization must focus
9、 on the overall performance of the optimization of gas engine heat pump. Gas engine driven heat pump heat recovery and utilization in many different ways, should according to actual use, select the appropriate waste heat recovery.1. Calculation model of heat pump systemThermal model of heat pump sys
10、tem the main consideration of the compressor, evaporator, condenser three major components of energy balance, that the throttling process is adiabatic process. If you ignore the system heat loss, then the compressor, condenser heat exchange heat and hot water heat absorption should equal the same qu
11、antity of cold, compressor, evaporator heat exchange and outdoor air heat should be equal.For the heating mode, heat pump heating is composed of three parts, one part is from the condenser of the heat pump is the plate heat exchanger heat, the other two parts separately from the engine block and the
12、 exhaust heat, therefore, the gas engine heat pump for heat for generalprinting. But, as for different outdoor temperatures thermal heat pump defrost on the amendment, the literature points out the coefficients are corrected.2 The heating season the heat load calculationThe purpose of this paper is
13、mainly on the gas engine heat pump during the whole heating season performance calculation and analysis.Gas engine driven heat pump system for total heat of low temperature hot water heating and hot water heating ( i.e. the gas engine waste heat recovery and recycling ), the gas engine and gas engin
14、e driven heat pump system the ratio of total heat calculation formula:In - gas engine waste heat recovery, W - gas engine heat pump total quantity, W - low temperature hot water heating, W - heat pump heating coefficient of performance - gas engine efficiency, 0.33 - heat recovery, recovery of waste
15、 heat of gas engineFig. 3Variation of/ with and With the consumption of primary energy heat than with , changes are shown in figure 3. at the same time, with the increasing of , accounts for less proportion of the .In the at the same time, along with the increase of , accounted for a percentage incr
16、ease. Therefore, trying to improve the at the same time, we should try to improve the , the gas engine heat pump to achieve the best overall performance.The following example to heating, first of all to the primary energy utilization rate of PER ( PRIMARY ENERGY RATIO ) is evaluated.PER = heat / an amount of energyFig. 4 The gas engine heat pump in a energy utilization rateHeating energy consump
