Gas engine heat pump heating process calculation and analysis - heat pumps, gas engine, heating - HV

Published: 14th March 2011
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Already in Japan, the United States and European countries has been widely used, but in China, promote the use of such heat pumps have not yet begun. With the natural gas project to proceed smoothly, and the growing power peak and valley difference, using natural gas as a refrigerant gas engine heat pump air conditioning energy applications began to receive attention. 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 engine heat pump heating process calculation model

Discussed in this paper the principle and gas turbine cycle heat pump shown in Figure 1, the Gas Heat Pump is air - water heat pump units for heating and cooling cycle can be. For heating cycle, the three-way 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 effects, so the article focuses on gas engine heat pump heating cycle.

2.1 engine exhaust calculation model

The engine working process more complicated, difficult relationship with a purely mathematical calculation 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, the practical application of experimental methods of 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, the working state of engine speed and torque with the engine. When a certain speed and torque of the engine, the engine's working conditions will be determined. Experiment, the engine work in a stable state, then measure the engine cooling water, cooling water between inlet 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 cylinder engine, exhaust flow and exhaust temperature with the speed and torque increases. As the engine cooling water circulation pump driven by the engine, so the flow of cooling water only with the speed of the. 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 Thermal heat pump system model

main consideration compressor, evaporator, condenser energy balance between the three major components, the process that is adiabatic throttling process. Heat loss if we ignore the system, then the compressor of heat, the condenser for heat and hot water heat absorption 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, fan flow and pump flow rate of known cases, all of the above simultaneous equations can be solved by the model. Solving the model in two ways: (1) If a given engine speed, you can get the speeds of gas engine heat capacity; (2) If the heating requirements of a given system capacity, then the requirements can be calculated for heat capacity under the gas engine heat pump speed. And accordingly can get gas engine heat pump energy consumption, waste heat and other content. As the fan pump energy consumption of energy accounts for a relatively small proportion, and fixed, so the calculation is not involved in this part of the energy consumption.

3 Calculation of gas engine heat pump heating and Analysis

3.1 heating season, heat load calculation

Main purpose of this paper is to gas engine heat pump in the heating season performance calculation and analysis, it must first determine the building's heat load. For ease of calculation, assuming only a building's heat load caused by the temperature difference, then known tn interior design temperature and outdoor design temperature tout, d, and the design load Qd of the case, you can calculate any of the building under the outdoor temperature tout heat load Qx

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