Papers by Keyword: Ground Source Heat Pump (GSHP)

Abstract: Ground-source heat pumps (GSHPs) are receiving increasing interest because of their potential to be energy-saving and environment-friendly. The recovery of the soil temperature which ambient ground heat exchangers (GHE) is closely related to the stable and sustained operation of the GSHP system, thus a lot of investigations were carried out. This paper reviews the research made by different methods about the recovery of the soil temperature in and out china.

Abstract: Because of the advantage on energy saving and environmental sustainable development, the ground source heat pump (GSHP) system has received the widespread attention and application in recent years.However,the difference between cooling load in summer and heating load in winter is obvious in most areas of our country,so it can cause the heat accumulation around ground heat exchanger,which will result in degradation of system performance and increment of system operating costs.To solve the problem of thermal imbalance,it is necessary to research the soil temperature field around the buried pipes in the process of system operation.This paper begins with a review of the studies about the ground source heat pump systems.This is followed by a review of various methods of enhancing the performance of heat pumps based on the thermal imbalance.And then,this paper shows some studies about ground source heat pump systems based on the groundwater seepage.

Abstract: This paper contains the results of research, carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026). For the ground source heat pump (GSHP) used as a heating system in regions with cold climate the thermal effects of ground moisture freezing-melting processes can make an essential long-term impact on GSHP performance. However, widely known models of heat transfer inside and outside GSHP borehole do not take into account such effects. In this paper we propose a method of engineering estimation of freezing-melting latent heat in the frame of modified cylindrical source model. The key feature of the method is the definition of effective thermal conductivity of ground to "convert" the latent heat of phase transition into equivalent heat flux from outer ground. The method is validated by laboratory measurements of ground thermal conductivity during the freezing-melting process.

Abstract: This article contains the results of theoretical research carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026) and demonstrates the need to consider the changes in ground heat transfer properties in geothermal borehole heat modeling, due to moisture condensation/evaporation in the ground pores. In GSHP systems design, the quantity of the boreholes is often overestimated and the associated parameters oversized while the extent of the ground heat transfer is underestimated. This is due to the incorrect assessment of the ground moisture content, which affects the ground heat transfer properties. This article presents the mathematical simulation of the ground pore moisture condensation at the GSHP boreholes. Also presented is numerical data derived from the calculations to assess the effect of the ground pore moisture condensation on the borehole heat transfer efficiency.

Abstract: On the basis of analyzing the building status of a typical port, the energy consumption characteristics of the port buildings were studied. Solar energy-ground source heat pump system was used in the port buildings, the system runs stably. Good heating and cooling performance fully meet users’ requirements. It makes the port building energy conservation operate, it moves forward the port development direction of building energy conservation measures.

Abstract: This paper contains the results of research, carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026). For the ground source heat pump (GSHP) used as a heating system in regions with cold climate the thermal effects of ground moisture freezing-melting processes can make an essential long-term impact on GSHP performance. However, widely known models of heat transfer inside and outside GSHP borehole do not take into account such effects. In this paper, we propose a method of engineering estimation of freezing-melting latent heat in the frame of modified cylindrical source model. The key feature of the method is the definition of effective thermal conductivity of ground to "convert" the latent heat of phase transition into equivalent heat flux from outer ground. The method is validated by laboratory measurements of ground thermal conductivity during the freezing-melting process.

Abstract: Presented in this article are the results of theoretical research carried out with financial support from the Ministry of Education and Science of the Russian Federation (contract ID RFMEFI57914X0026) and demonstrating the need to consider the changes in ground heat transfer properties in geothermal borehole heat modeling, due to moisture condensation/evaporation in the ground pores. It is our opinion that in GSHP systems design, the quantity of the boreholes is often overestimated and the associated parameters oversized while the extent of the ground heat transfer is underestimated. In most cases, in designing GSHP operation and performance, this is due to the incorrect assessment of the ground moisture content, which has a most tangible effect on the ground heat transfer properties. This article demonstrates the need to consider the ground moisture condensation/evaporation in GSHP systems design. Presented in the article is the mathematical simulation of the ground pore moisture condensation at the GSHP boreholes. Also presented is numerical data derived from the calculations to assess the effect of the ground pore moisture condensation on the borehole heat transfer efficiency. Through analysis and experimentation, it was determined that the ground pore moisture condensation have a substantial impact on the GSHP efficiency.

Abstract: In order to clarify the operation and performance of ground source heat pump in severe cold regions, the paper based on the demonstration project about ground source heat pump at Yifu teaching building of Jilin Jianzhu University, expounds the profile of the demonstration project and the data monitoring program of the system about ground source heat pump, shows monitoring data of the running condition in winter in line with the demonstration project and analyses the monitoring data briefly. The result shows that the heating effect of ground source heat pump system is favorable and ground source heat pump system is obviously environmental and energy saving.

Abstract: Faced with two problems of energy shortage and environmental pollution, people focus on the development of renewable energy resources. Geothermal energy is the most realistic and competitive one among the renewable energy resources. Besides its reserves is abundant. Geothermal energy is widely used in many fields. Geothermal power generation technologies are introduced and whether dry stream power generation method, ORC or KC method is elected depends on the temperature of geothermal water. Geothermal heating is the simplest, most economic and most effective utilization of low temperature geothermal energy. There are also various applications in industry for geothermal energy. Geothermal water is more and more popular in health care. In addition, geothermal energy is used in planting and breeding. Cascade utilization is the most promising way for geothermal energy because the energy efficiency is the highest. Two comprehensive utilization projects are discussed in this paper. Then ground source heat pump is introduced.

Abstract: Renewable energy is the inevitable choice for the future sustainable energy development. The heat pump system by using earth energy is increasing very rapidly. In this paper, by studying the underground heat exchanger heat transfer mode, the computing platform for GSHP system was established. Through a engineering case, the influence character of the initial ground temperature on the fluid temperature, the heat pump power consumption, and the design depth of system were analyzed, which provide an approach for system engineering design and operation prediction, and for the thermodynamic analysis of performance of system year by year and prospective study to guide the engineering practice.