Abstract: This paper describes the experimental results of the intermittent operation of ground source heat pump in winter. During the operation of ground-source heat pump, the ground temperature can be recovered through controllable intermittent process to make up for the lack of heat transfer in the soil. The rules and trends of temperature change have been changed to realize the good heat transfer and heat pump operating conditions. Key words: geothermal energy recovery ground source heat pump intermittent operation of ground source pump in winter Dalian Unversity of Technology FAN Ping-ping DUAN Mu-lin SHU hai-wen Shenyang Gas & Heat Research and Design Institute of Construction Ministry WANG Xue-long Abstract: This text introduced the intermittent movement test result of ground source pump in winter. Certificated that in ground source heat pump (GSHP) of geothermal energy utilization system, a concept of intermittent process (GSHP on or off) was proposed to restore underground temperature and therefore insufficient rock heat transfer. And change the temperature variety regulation and trend. Intensify the heat transfer and good work condition of heat pump. Keywords: geothermal energy; ground temperature restoration; ground source heat pump; intermittent movement 1 Introduction Ground energy is a clean and renewable natural energy With perennial temperature stability, heat pump is the ideal form of heat source. However, due to its weak heat transfer capacity, geothermal energy systems with soil source as the main body require large heat exchange area and floor space, and large initial investment of equipment has restricted the development of this technology. Therefore, researchers put forward the idea of ​​controllable intermittent operation [1]. The concept of intermittency is an effective measure to efficiently utilize geothermal energy based on the intermittent nature of the operation of the heating and cooling system in the building environment and the recoverable characteristics of the geothermal. Through the artificial control of the intermittent operation of heat pump units, to strengthen the heat transfer process. If we can take full advantage of the intermittent make up for the slow heat of underground shortcomings, we can achieve full heat transfer, to minimize the number of buried heat exchanger borehole, reducing its initial investment. Intermittent heat recovery process of underground heat exchangers in underground heat exchangers can change the trend of its temperature and increase or decrease the equilibrium stable temperature so that the heat pump works under the ideal working conditions. For the temperature drop of the heat sinks or the temperature rise of the exothermic well, the operating conditions of the heat pump unit are mainly affected by the minimum temperature range of the temperature drop and the maximum temperature range of the temperature rise. Control of heat pump import and export of the ideal temperature is an important guarantee for its efficient operation. To this end, the test based on the theory of controlled intermittent operation to develop a reasonable operation of the program, ground source heat pump winter operating conditions for experimental study [1,2]. 2 test system The temperature measurement of this experiment all use PT100 copper - Kang copper thermal resistance, the allowable error of ± 0.3 ℃, all parameters measuring point all the introduction of the control system, the implementation of non-stop automatic acquisition and control, and automatically store data. The temperature test is mainly underground pipe wall temperature test, water temperature test. (1) Underground Buried Pipe Wall Temperature Test Underground Buried Pipe Test System A total of 9 underground burial pipes are arranged at a measuring point of 10 meters each at a ground buried pipe wall of 75 meters in depth and 50 meters in depth , While the 25-meter depth is a measuring point every 5 meters, of which two sets of thermocouples are embedded in the buried pipe in a depth of 75 meters. As shown in Figure 1 Figure 1 Schematic arrangement of temperature measuring point (2) water temperature test The water temperature measured in this experiment is mainly underground pipe import and export water temperature and heat pump import and export water temperature. 3 EXPERIMENTAL RESULTS ANALYSIS Because soil source heat pump is greatly influenced by soil quality and climatic conditions, experimental study on the soil quality and climatic conditions in Dalian is carried out. The characteristics of soil are shown in Table 1. Table 1 Soil Characteristics Table 1 Layer 2 Sandstone Sandstone Thickness (m) 0 ~ 5 5 ~ 75 Thermal Conductivity (W / m · ℃) 1.6 4.4 Specific Heat * Density (J / m3 · ℃ × 106) 1.4 3.56 3.1 Data Processing Method Instantaneous within each test day The average heat transfer is calculated as: (3-1) Where: Q-tube heat exchanger in each test day instantaneous average heat exchange, kW; - circulating fluid density, kg / m3; cp - circulating fluid ratio Heat, kJ / (kg · ℃); -U type water flow in borehole heat exchanger, m3 / s; to U-shaped tube outlet average temperature in each test day, ℃; U-tube inlet average temperature, ℃. Underground heat exchanger unit depth of heat exchange calculation formula: