燃气机热泵热水器系统的理论与实验研究

发布时间：2019-03-19 15:22

【摘要】：燃气机热泵热水器系统是以天然气为一次能源输入，为建筑物制冷季节提供冷量、供暖季节提供热量和常年提供生活热水的新型装置，本文对燃气机热泵热水器系统进行了理论模拟和实验研究。 以燃气机热泵热水器系统为基础，建立了燃气发动机和热泵系统的数学模型，以实验和仿真相结合的方法研究燃气机热泵热水器在冬季供暖季节的运行性能，结果表明所建立的模型能够有效预测燃气机热泵热水器的运行特性。 对燃气机热泵热水器以循环加热模式和一次加热模式工作时的运行特性进行了对比研究，研究过程中主要考虑了环境温度、冷凝器冷却水流量、制冷剂过热度及发动机转速对系统性能的影响，结果表明系统以一次加热模式运行时具有更高的一次能源利用率。 燃气机热泵热水器在供冷季节以板式换热器取代翅片管换热器做为冷凝器，在供冷的同时，冷凝器的冷凝热及回收的燃气发动机余热来制取生活用热水。研究结果表明：回收冷凝器冷凝热后系统的一次能源利用率PER得到了显著提升，当发动机转速为1900rpm时，系统的PER最小值也高达1.79，系统的节能效果显著。 基于国内四个城市气象统计数据，对燃气机热泵热水器系统的制冷季节能效比（SEER）、制冷季节一次能源利用率（SPERr）、制热季节能效比（HSPF）和制热季节一次能源利用率（SPERh）进行了计算。 在只考虑发动机转速和环境温度的基础上，提出了系统综合一次能源利用率PERzh的定义，并对燃气机热泵热水器在非供冷和供热季节的运行进行了评价，，在实验基础上计算出系统的PERzh值为1.453，系统具有较高的一次能源利用率，节能效果明显。
[Abstract]:Gas engine heat pump water heater system is a new type of device which takes natural gas as the primary energy input, provides cooling capacity for building refrigeration season, heat supply during heating season and daily hot water supply all the year round. In this paper, the theoretical simulation and experimental study of gas engine heat pump water heater system are carried out. Based on gas engine heat pump water heater system, the mathematical model of gas engine and heat pump system is established. The performance of gas engine heat pump water heater in winter heating season is studied by means of experiment and simulation. The results show that the model can effectively predict the performance of gas engine heat pump water heater. The operating characteristics of gas engine heat pump water heater in cycle heating mode and primary heating mode are compared and studied. The environmental temperature and cooling water flow rate of condenser are mainly considered in the research process. The effect of refrigerant superheat and engine speed on the performance of the system shows that the system has higher primary energy efficiency when running in primary heating mode. In the cooling season of gas engine heat pump water heater, plate heat exchanger is used as condenser instead of finned tube heat exchanger as condenser. At the same time, condensing heat of condenser and waste heat of gas engine are recovered to produce hot water for domestic use. The results show that the primary energy utilization rate (PER) of the system is significantly increased after the condensing heat is recovered. When the engine speed is 1900rpm, the minimum PER value of the system is also as high as 1.79, and the energy saving effect of the system is remarkable. Based on the meteorological statistics of four cities in China, the energy efficiency of gas engine heat pump water heater system in refrigeration season is higher than that of (SEER), refrigeration season. The energy efficiency of primary energy in the refrigeration season is (SPERr),. The seasonal energy efficiency ratio (HSPF) and primary energy efficiency (SPERh) of heating season were calculated. Based on the consideration of engine speed and ambient temperature, the definition of integrated primary energy efficiency (PERzh) is proposed, and the operation of gas engine heat pump water heater in non-cooling and heating season is evaluated. On the basis of experiments, the PERZ value of the system is calculated to be 1.453. The system has a high primary energy utilization rate, and the energy saving effect is obvious.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2013
【分类号】：TU822

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