| With building energy consumption has claimed an ever-growing share of the soil total energy consumption, making the building energy conservation which is the highest potential and the most directly effective way among various kinds of energy saving way. Hence, solar energy and ground source heat pump as the two important play an important role in the building energy conservation. Compared with the single solar energy and groud source heat pump, the combined system has not only more advantages of single heat source does not have, but also can overcome their own shortcomings. Therefore, in this paper the experimental study and simulation analysis have been carried for solar-ground source heat pump system.In this paper, the components of the experimental platform of solar-ground source heat pump system were introduced in detailed, including sloar collector system, vertical U-tube ground heat exchangers, adjustable fan coil air-conditioning and water to water heat pump. According to the principle of error analysis, the expressions of the test error of the heat capacity and the heating performance coefficient were given, and the test error of the heat capacity was 5.66%, the test error of the heating performance coefficient was 6.93%.In order to address the requirements of the experimental test of solar-ground source heat pump system, the monitoring platform of solar-ground source heat pump system was developed. The development and utilization of monitoring platform for solar-ground source heat pump coupling system is accomplished by using Siemens PLC200 as the lower computer and Siemens configuration software WinCC as the host computer, which can realize the function of field data archiving, operation mode switching and automatic control.In this paper, the heating experiment of solar-ground source heat pump system with different operating modes was accomplished in the Shanghai area, analyzed the influence of different heating operation modes on soil temperature. The experimental results indicate for 5 consecutive days, the average temperature of ground source heat pump operating mode was 17.38℃, and the average temperature of combined heating mode was 18.42℃; the natural average recovery rate was 0.61 and the forced average recovery rate of the soil was more than 1; the change of soil temperature was largely determined by the intensity of solar radiation with combined mode.The model of solar-ground source heat pump system was established by using TRNSYS software as the simulation platform, and the Design Builder was used as the load calculation software to calculate the whole year hourly load of the air condition. The evaporator inlet and outlet temperature, COPh, COPs, the load of air condition, the soil temperature, respectively were analyzed. The results show that: for the single ground source heat pump system with solar energy as an auxiliary heat source, the average inlet temperature of the evaporator was increased by 20%, the average COPh was increased by 20.52%, the average COPs was increased by 6.5%;the effect of terminal load on COPs was nonlinear, and the trend was getting smaller and smaller; the change trend of soil temperature in four different modes was used to verify the accuracy of TRNSYS in predicting the trend of soil temperature in four modes.In the heating season, solar energy plays an active part for the traditional ground source heat pump system, which plays an important role in the recovery of underground temperature field and heat pump heatinge performance, but for its economy and the feasibility of lager buildings remains to be verified. The reseach of this paper can provide a reliable reference for the disigin, operation management and basic data of solar ground source heat pump system in Shanghai area. |
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