太阳能燃气热泵与热网互补供热仿真研究
发布时间：2018-10-10 13:52
【摘要】：随着生产发展、生活水平提高,能量消耗迅速增长,开发利用新能源已经是当今社会迫切需要解决的热点问题。目前,天然气是世界上众多能源中最清洁的能源,由于其储量丰富,天然气的开发与利用越来越得到世界各国的高度重视。太阳能作为一种洁净能源,不仅是一次能源,同时也是可再生能源,太阳能资源丰富,对环境无任何污染。在现在,能源和环境问题越来越得到人们的普通重视,开发利用太阳能一方面减少环境污染,另一方面可有效节约高位能,因此具有广阔的应用前景。本文在已有的太阳能热泵系统和燃气热泵系统基础上,提出了一种新型供热系统,即太阳能燃气热泵供热系统,本系统是以太阳能作为热泵系统蒸发器端的热源,由燃气发动机驱动的热泵供热系统,即以太阳能作为低品位能,利用燃气发动机驱动压缩机完成热泵循环,不仅能够回收系统余热,提高整个系统的COP和一次能源利用率PER,而且以天然气作为能源的同时可以缓解电网的压力,同时天然气作为一种清洁能源,还能够减少对环境的污染。在运行上,由于燃气的费用要低于电费,从而还可以节约一定的运行费用。因此,太阳能燃气热泵的研究具有很大节能和经济的意义。本文设计了太阳能燃气热泵系统与外网互补供热原理图,并对其各个子供热系统进行设计,对整个系统的运行模式进行了较为详细的研究。从能耗和经济性两个方面分析,将本系统和其他现有的供热系统进行比较。以TRNSYS、Dest及MATLAB仿真模拟软件为工具,对太阳能燃气热泵系统在整个供暖期进行了仿真模拟,研究本供热系统在我国严寒地区条件下的适用性,以期为实际工程的设计提供一定参考。利用Dest和TRNSYS对基准建筑物的模型进行建立,分析了基准建筑动态负荷及太阳能部分与燃气热泵部分所能承担的总负荷比例,得出两者负荷比例为：燃气热泵承担65%的设计负荷,太阳能部分承担35%的设计负荷,为系统设备选型提供了依据。利用TRNSYS软件对太阳能供热系统进行了仿真模拟,利用MATLAB软件对燃气热泵进行了仿真模拟,将前者得到的数据带入后者,作为蒸发端的输入数据,即可模拟出整个系统的供热性能,可以得到系统的COP最高可达到4.76,一次能源利用率PER最高可达到1.96,且冷凝端温度可达到57.8℃,通过比较可知本系统性能优于太阳能热泵系统和燃气热泵系统。从供热系统的稳定性、安全性、使用寿命及经济性角度考虑,为了得到更多的冷凝热量,不能够无限增加燃气用量,应使天然气的用量保证在一定的可控范围内。当压缩机的转数取在1600—2000转/分的范围内时,太阳能燃气热泵供热系统的供热性能和舒适性最好,在系统运行过程中,应尽可能通过对天然气使用量的调节,使压缩机转速保证在1600—-2000转／分区间内。
[Abstract]:With the development of production, the improvement of living standard and the rapid increase of energy consumption, the development and utilization of new energy has become a hot issue that needs to be solved urgently. At present, natural gas is the cleanest energy among many energy sources in the world. Because of its rich reserves, the development and utilization of natural gas have been paid more and more attention to. As a clean energy, solar energy is not only a primary energy, but also a renewable energy. Solar energy resources are abundant, and no pollution to the environment. Nowadays, people pay more and more attention to the energy and environment problems. On the one hand, the exploitation and utilization of solar energy can reduce environmental pollution, on the other hand, it can effectively save high energy, so it has a broad application prospect. Based on the existing solar heat pump system and gas heat pump system, a new type of heating system, solar gas heat pump heating system, is proposed in this paper. The system uses solar energy as the heat source of the evaporator of the heat pump system. The heat pump heating system driven by gas engine, which takes solar energy as low-grade energy and uses gas engine to drive compressor to complete the heat pump cycle, can not only recover the residual heat of the system, Increasing the COP and primary energy utilization PER, of the whole system and using natural gas as energy can relieve the pressure of power grid, and natural gas as a kind of clean energy can also reduce the pollution to the environment. In operation, the cost of gas is lower than electricity, so it can save a certain operating cost. Therefore, the study of solar gas-fired heat pump has great energy-saving and economic significance. In this paper, the schematic diagram of complementary heating between solar gas heat pump system and outer net is designed, and each sub-heating system is designed, and the operation mode of the whole system is studied in detail. This system is compared with other existing heating systems in terms of energy consumption and economy. Based on TRNSYS,Dest and MATLAB simulation software, this paper simulates the solar gas heat pump system in the whole heating period, and studies the applicability of the heating system in the cold region of our country, in order to provide some reference for the design of the actual project. The model of reference building is built by Dest and TRNSYS. The dynamic load of reference building and the total load ratio of solar energy and gas heat pump are analyzed. The results show that the load ratio of the two is 65% of the design load of gas heat pump. The solar energy part bears 35% of the design load, which provides the basis for the selection of the system equipment. The solar heating system is simulated by TRNSYS software, and the gas-fired heat pump is simulated by MATLAB software. The data obtained from the former is brought into the latter as the input data of the evaporator. The heating performance of the whole system can be simulated. The maximum COP of the system can reach 4.76, the PER of primary energy utilization can reach 1.96, and the condensation end temperature can reach 57.8 鈩，
本文编号：2262031
[Abstract]:With the development of production, the improvement of living standard and the rapid increase of energy consumption, the development and utilization of new energy has become a hot issue that needs to be solved urgently. At present, natural gas is the cleanest energy among many energy sources in the world. Because of its rich reserves, the development and utilization of natural gas have been paid more and more attention to. As a clean energy, solar energy is not only a primary energy, but also a renewable energy. Solar energy resources are abundant, and no pollution to the environment. Nowadays, people pay more and more attention to the energy and environment problems. On the one hand, the exploitation and utilization of solar energy can reduce environmental pollution, on the other hand, it can effectively save high energy, so it has a broad application prospect. Based on the existing solar heat pump system and gas heat pump system, a new type of heating system, solar gas heat pump heating system, is proposed in this paper. The system uses solar energy as the heat source of the evaporator of the heat pump system. The heat pump heating system driven by gas engine, which takes solar energy as low-grade energy and uses gas engine to drive compressor to complete the heat pump cycle, can not only recover the residual heat of the system, Increasing the COP and primary energy utilization PER, of the whole system and using natural gas as energy can relieve the pressure of power grid, and natural gas as a kind of clean energy can also reduce the pollution to the environment. In operation, the cost of gas is lower than electricity, so it can save a certain operating cost. Therefore, the study of solar gas-fired heat pump has great energy-saving and economic significance. In this paper, the schematic diagram of complementary heating between solar gas heat pump system and outer net is designed, and each sub-heating system is designed, and the operation mode of the whole system is studied in detail. This system is compared with other existing heating systems in terms of energy consumption and economy. Based on TRNSYS,Dest and MATLAB simulation software, this paper simulates the solar gas heat pump system in the whole heating period, and studies the applicability of the heating system in the cold region of our country, in order to provide some reference for the design of the actual project. The model of reference building is built by Dest and TRNSYS. The dynamic load of reference building and the total load ratio of solar energy and gas heat pump are analyzed. The results show that the load ratio of the two is 65% of the design load of gas heat pump. The solar energy part bears 35% of the design load, which provides the basis for the selection of the system equipment. The solar heating system is simulated by TRNSYS software, and the gas-fired heat pump is simulated by MATLAB software. The data obtained from the former is brought into the latter as the input data of the evaporator. The heating performance of the whole system can be simulated. The maximum COP of the system can reach 4.76, the PER of primary energy utilization can reach 1.96, and the condensation end temperature can reach 57.8 鈩，
本文编号：2262031
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