scholarly journals Exergy Analysis of a Ground-Coupled Heat Pump Heating System with Different Terminals

Entropy ◽  
2015 ◽  
Vol 17 (4) ◽  
pp. 2328-2340 ◽  
Author(s):  
Xiao Chen ◽  
Xiaoli Hao
Keyword(s):  
Heat Pump ◽  
Exergy Analysis ◽  
Heating System ◽  
Ground Coupled Heat Pump

scholarly journals Exergy Analysis of Phase-Change Heat-Storage Coupled Solar Heat Pump Heating System

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5552
Author(s):  
Chuanhui Zhu ◽  
Shubin Yan ◽  
Xiaodong Dong ◽  
Wei Zhang ◽  
Biyi Huang ◽  
...  
Keyword(s):  
Solar Energy ◽  
Phase Change ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Heat Storage ◽  
Heating System ◽  
Exergy Loss ◽  
Solar Collectors ◽  
Solar Heat ◽  
Northern Regions

With the rapid development of industrialization, the excessive use of fossil fuels has caused problems such as increased greenhouse gas emissions and energy shortages. The development and use of renewable energy has attracted increased attention. In recent years, solar heat pump heating technology that uses clean solar energy combined with high-efficiency heat pump units is the development direction of clean heating in winter in northern regions. However, the use of solar energy is intermittent and unstable. The low-valley electricity policy is a night-time electricity price policy. Heat pump heating has problems such as frosting and low efficiencies in cold northern regions. To solve these problems, an exergy analysis model of each component of a phase-change heat-storage coupled solar heat pump heating system was established. Exergy analysis was performed on each component of the system to determine the direction of optimization and improvement of the phase-change heat-storage coupled solar heat pump heating system. The results showed that optimizing the heating-end heat exchanger of the system can reduce the exergy loss of the system. When the phase-change heat-storage tank meets the heating demand, its volume should be reduced to lower the exergy loss of the tank heat dissipation. Air-type solar collectors can increase the income exergies of solar collectors.

Effect of Ground-Coupled Heat Pump Technique Application on Economic Performance and Emission Reduction in Swine Farm in Beijing China

2012 ◽  
Vol 610-613 ◽  
pp. 3196-3201 ◽  
Author(s):  
Mei Zhi Wang ◽  
Ji Jun Liu ◽  
Zhong Hong Wu ◽  
Zhao Hui Chen ◽  
Jian Hui Tian
Keyword(s):  
Heat Pump ◽  
Economic Performance ◽  
Emission Reduction ◽  
Heating System ◽  
Pump System ◽  
Heating Systems ◽  
Performance And Emission ◽  
Swine Farms ◽  
Ground Coupled Heat Pump ◽  
Beijing China

To find low carbon heating measures in swine farms in Beijing China, A study of swine houses with area of 920 m2in swine farms in Beijing China was conducted and economic performance, emission reduction of ground-coupled heat pump (GCHP) heating system, coal fired heating system and other heating systems were analyzed and compared. The results showed that the initial investment of ground-coupled heat pump system was more than that of the coal fired heating system, the relative running cost of the heating systems of ground-coupled heat pump, coal fired, electricity resistance and natural gas was 0.86, 1.00, 3.17 and 1.22, respectively. CO2avoidances of GCHP heating systems were 57% and 73%, respectively, compared with conventional coal fired heating system and electricity resistance heating.

scholarly journals Exergy analysis of the performance of low-temperature district heating system with geothermal heat pump

2014 ◽  
Vol 35 (1) ◽  
pp. 77-86 ◽  
Author(s):  
Robert Sekret ◽  
Anna Nitkiewicz
Keyword(s):  
Heat Exchanger ◽  
Low Temperature ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Heating System ◽  
Total System ◽  
Exergy Destruction ◽  
Geothermal Heat ◽  
District Heating System ◽  
Absorption Heat Pump

Abstract Exergy analysis of low temperature geothermal heat plant with compressor and absorption heat pump was carried out. In these two concepts heat pumps are using geothermal water at 19.5 oC with spontaneous outflow 24 m3/h as a heat source. The research compares exergy efficiency and exergy destruction of considered systems and its components as well. For the purpose of analysis, the heating system was divided into five components: geothermal heat exchanger, heat pump, heat distribution, heat exchanger and electricity production and transportation. For considered systems the primary exergy consumption from renewable and non-renewable sources was estimated. The analysis was carried out for heat network temperature at 50/40 oC, and the quality regulation was assumed. The results of exergy analysis of the system with electrical and absorption heat pump show that exergy destruction during the whole heating season is lower for the system with electrical heat pump. The exergy efficiencies of total system are 12.8% and 11.2% for the system with electrical heat pump and absorption heat pump, respectively.

scholarly journals Exergy Analysis of Building Heating with a Groundwater Source Heat Pump

2020 ◽  
Author(s):  
Ružica Todorović ◽  
◽  
Milan Gojak ◽  
Miloš Banjac ◽  
Nedžad Rudonja
Keyword(s):  
Water Temperature ◽  
Heat Pump ◽  
Exergy Analysis ◽  
Operation Mode ◽  
Heating System ◽  
Heat Pumps ◽  
Groundwater Temperature ◽  
Monthly Basis ◽  
Pump Operation ◽  
Groundwater Heat Pump

The paper presents an exergy analysis of the groundwater heat pump operation for theneeds of building heat-ing. The analysis was conducted on a monthly basis, given the dependence of exergy on the changing state of the envi-ronment. Changes inheating coefficient and exergy efficiencyof thegeothermal heat pumpheating systemdepending onthe influentialparameters wereanalyzed: groundwater temperature fromthe pumping well, changes in the ground-water temperature on the heat pump evaporatorand water temperature inthe heating system.The obtained results provide insight into thermodynamic indicators of heat pump operation depending on the groundwater temperature and the operation mode of the building heating system. The conducted analysis provides guidelines for the design and opti-mization of heat pumps that work with groundwater as a heat source.

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