Analysis of Operation Characteristics of Gas Heat Pump Type Chiller/Hot Water Heater Hou Genfu Wang Wei Mu Chunfeng 21. Harbin Institute of Technology 5 Heilongjiang Harbin 150, 0; 2. Heilongjiang Province Tailai Grain Depot, Heilongjiang Tailai 162400 times energy use factor corpse influence.
1 Introduction With the increasingly prominent issue of energy saving and environmental protection, people are constantly discussing the use of heat pumps and their chiller units for heating and cooling. This article discusses the operating characteristics of gas enthalpy hot and cold water dispensers. The so-called operating characteristics of gas-fired heat pump water chiller/heater unit refers to the relationship between the heat production capacity and heat capacity coefficient of the unit and the value of the secondary energy use factor and the external parameters during the actual operation. . This is an important indicator to evaluate the performance of Taiwan's gas hot water heaters and chillers, and it is also a concern for designers and users.
2 System Components The test system for a gas heat pump chiller/heater unit consists of parts. The first part of the gas heat pump chiller/heater system includes internal combustion engine piston compressor cooler condenser evaporator throttle oil separator and exhaust heat recovery device. The first part of the hot water system, it includes a hot water tank. Hot water mixer water pump, hot water out of the hot water tank, hot water pump water pump to the condenser cooler, after the exhaust heat recovery device. The hot water system includes a cold water tank cold water mixer cold water pump.
Cold water flows from the cold water tank and is sent by the cold water mixer cold water pump to the evaporator to cool down. Return to the first part of the cold water tank gas supply and exhaust system, which includes the liquefied petroleum gas cylinder group pressure regulator mixer exhaust heat recovery device and other liquefied petroleum gas gasification 6 by the cylinder flow, after regulating by the pressure regulator, enter the mixing After mixing the air with the air, it enters the gas engine. The liquefied petroleum gas is fully burned in the cylinder of the gas engine and the exhaust gas is exhausted to the atmosphere through the exhaust heat recovery device.
3 operating characteristics analysis 3.1 heat pump heating performance coefficient 01 In order to assess the heat pump energy consumption characteristics, usually introduced an important for the vapor compression heat pump can be specifically heat pump system from the low-temperature heat source; W shaft power consumption of the number of cooling, from the number of This can be, the heat pump 09 factory 5, that is to say relying on the heat pump system will be higher than the heat consumed by the shaft, which is the heat pump energy saving principle.
3.2 Factors Affecting Hot Chestnut 01 Analysis 1 The difference between the high and low heat source temperature In the ideal inverse Carnot heat pump cycle condition, the following formula can be seen from the above formula. When, the smaller, the temperature difference between the high and low temperature heat sources plus the heat pump The more the decrease, the higher the heat-generating coefficient of the heat pump system. The temperature difference between the high- and low-temperature heat sources should be reduced as much as possible. 2 High and low heat source temperature The formula 09.1 = Plant 7 The two sides are separately derived. It can be seen that 702 is always a positive value. The coefficient of heating performance of this chilly chestnut system is such that the temperature of the heat source of the heat pump system at the temperature of the high temperature heat source will be the same as the temperature of the low temperature heat source. It may be better.
From Equation (4), it can be seen that it is always a negative value. Therefore, the heating performance coefficient of the heat pump system, 9, the value will decrease with the increase of the temperature of the high temperature heat source under the condition that the temperature of the low temperature heat source is constant. With the decrease of the temperature of the high-temperature heat source, the temperature of the high-temperature heat source is therefore low, which is advantageous for increasing the value of 7.
From formula (3) formula (4) also, to Jieshan corpse factory, so for the gas-fired hot chestnut unit there are 0, 4 burning engine block cooling heat and waste heat heat recovery frame heat; 0, the gas engine consumes the secondary energy .
3.4 For gas-fired heat pump type chilled water heaters, and for chilled water heaters, the unit provides hot and cold water to users at the same time. This kind of heat engine combining the functions of a refrigerator and a heat pump is also called a combined cycle machine. Heat pumps that work in a combined cycle can achieve better energy savings. Because the power consumption 1 allows us to effectively obtain the cooling capacity 6 and effectively obtain the heating capacity 01.
The coefficient of thermal performance of the chilled water heaters, 92 and 4 are also divided into the energy efficiency coefficient, which is the coefficient of performance.
From the heating performance coefficient of the chiller and hot water unit, and the calculation formula of the secondary energy utilization factor, H2, it can be seen that the hot and cold water heating machines have both high values ​​of 0.9, 92, and heart. It is very economical from the perspective of energy use. The change of temperature of cold and hot source temperature range of cold and hot source is similar to that of cold and hot water unit, 02 and Hu. The change of the temperature of the low temperature source has a greater influence on the heat performance coefficient of the heat pump system than that of the high temperature heat source. Effect of thermal coefficient. Therefore, for the heat pump, under the possible conditions, priority should be given to the use of higher temperature low-temperature heat sources, which is of greater significance for improving the heating performance coefficient of the heat pump.
3.3 Sub-Energy Utilization Factors of Heat Pumps For heat pumps with the same heating performance coefficient, the energy conservation significance and economical efficiency are different if different high energy sources are used. In particular, compared to other heat settings, the lack of 001 is comparable. , 1 can only reach the thermal performance of the thermal system itself, can not reflect the conversion efficiency of the heat pump prime mover, and therefore can not fully reflect the energy efficiency of the heat pump system. For this reason, it is proposed to use the secondary energy utilization factor to evaluate the energy-saving effect of the heat pump. The sub-energy utilization coefficient refers to the total heat output of the heating system and the 4 consumed by the system. To make the heat pump system have a large number of 09 households, 5, the operation degree is lower, and the low-temperature heat source temperature is higher; (1) the temperature of the low-temperature heat source Changes in the heat pump system, the impact of greater than the change in temperature of the heat source on the heat pump system; 4 the same, heating and cooling of the fuel pump chiller unit value.
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