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HC HVAC & R Network 1 Introduction Natural gas engine-driven heat pump unit (GasEngine-DrivenHeatPump, hereinafter referred to as gas engine heat pump) in Japan, the United States and other countries in Europe have been widely used, but in our country, promote the use of this type of heat pump has not yet started. Smooth as natural gas, and power difference between peak and valley growing, using natural gas as a cooling air-conditioning Energy The gas engine heat pump applications and being concerned. As the gas engine heat pump heating in winter when the introduction of natural gas engine cylinder and exhaust heat, thus, in the heating mode, gas engine heat pump and conventional electric-driven heat pump with a larger difference. In this paper, a natural gas engine waste heat produced were studied law, and apply the principle of conservation of energy to establish a gas engine heat pump system model of steady-state calculations. By calculation, analysis of gas engine heat pump characteristics of the process and the winter heating energy consumption. 2, Gas Heat Pump heating process of the calculation model Discussed this principle and system of gas engine heat pump cycle as shown in Figure 1, the gas engine heat pump is the air - water heat pump units, can be heating and cooling cycle. For heating cycle, the three links Valve 1 and 2 were switched to the location of waste heat recovery, hot water heat after absorbing heat exchanger to absorb heat engine, and then heat transferred to the heat user. As the heat of the gas engine heat pump Heating Greater impact, this article focuses on gas engine heat pump heating cycle. 2.1 computational model of engine exhaust As the engine working process complicated, difficult relationship with the purely mathematical computation derived model of the engine's heat. Some studies provided a formula for calculating the heat engine, but the general formula is poor, only suitable for certain types of engines. In this paper, experimental approach to the practical application of the gas engine heat pump system model data required in engine exhaust. Measured by the physical quantities can be calculated indirectly over the heat engine. Steady state conditions, working state of engine speed and torque with engine related. When the engine speed and torque is constant, the engine will determine the working status. Experiment, the engine work in a stable state, then measure the engine Cooling Water flow, import and export of cooling water temperature, exhaust gas temperature, gas flow rate, excess air coefficient data. These data can be calculated according to engine heat data. From the experimental results, the remainder of the heat engine cylinder block, exhaust flow and exhaust temperature with the speed and torque increases. As the engine cooling water circulation pump driven by the engine, so the cooling water flow is only about the same speed. Results on the surface interpolation and linear fitting way to get other non-physical quantity under test conditions point to obtain the data needed to calculate the engine heat. 2.2 Computing Model Heat Pump Heat pump system of thermal model major considerations Compressor , Evaporator, condenser relationship between the three components of energy balance, the process that is adiabatic throttling process. If ignored in the heat loss, then the compressor of heat, the condenser for heat and hot water absorption heat should be equal, the same cooling capacity compressor, evaporator heat transfer and heat of outdoor air should have the same . On the compressor, the can manufacturer fitted the sample data provided by the compressor and the cooling capacity of heat with the condensing temperature, evaporating temperature and compressor speed relationship. 2.3 Model Solution The gas engine heat pump to determine the structural parameters, Fans Air flow and pump flow of known cases, all of the above simultaneous equations can be solved by the model. We are high quality suppliers, our products such as portable rockwell hardness tester Manufacturer , digital hardness tester for oversee buyer. To know more, please visits digital hardness tester.
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