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

Sekret R., Nitkiewicz A.

Archives of Thermodynamics

2014

Vol. 35, no. 1

77--86

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°C 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°C, 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.

Evaluation of operation of geothermal heat plant supplied with mean-enthalpy geothermal water and co-operating with heat receivers connected in series

Nowak W., Stachel A.

Archives of Thermodynamics

2005

Vol. 26, no. 3

67-81

In this paper presented are the results of analysis of utilisation the geothermal energy in a geothermal heat plant supplied with the mean-enthalpy geothermal water. This heat plant is equipped in geothermal heat exchanger, absorption heat pump and peak load boiler and co-operates with low- and high-temperature heating systems connected in series. In such installation acquisition of geothermal energy takes place by means of the heat exchanger, which transfers heat from geothermal water to the municipal water with a simultaneous use of a heat pump. A role of a lower reservoir in the heat pump is played by a part of return municipal water, which decreases its temperature with respect to the kind of used heat pump and in relation to the temperature of return municipal water. Supplementary to that installation is a peak-load boiler assuring (in the case of such necessity) heating up of feeding municipal water to the required temperature.