| With the constant development and progress of society, the demand of using energy by human has been increasing; so it leaded to the energy crisis. Ground-source heat pump system is an energy efficiency and environmental protection as a feature and advanced heating and air conditioning technology to be enable the sustainable development.In this paper, a hospital building was used two types of systems: a ground source heat pump and fire pool joint operation system and a ground source heat pump and cooling towers joint operation system, to analyze these two systems's performance of operation and construction of energy efficiency effect.Through ground-source heat pump combined with the fire pool operation and ground source heat pump combined with the cooling tower running comparison of these two programs, respectively, from the technical and economic systems design, energy efficiency ratio of the system and other aspects of the energy-saving effect, come in under the conditions of this study, ground source heat pump combined with the cooling tower running program has good energy saving effect.Firstly, based on the cooling load of the hospital projects, using ground-source heat pump system design method, regulating the different district of the underground pipe system to meet the restoration of soil temperature and ensure the sustainable use of soil. By contrasting the two programs, the GSHP with fire pool associated running system and the GSHP with cooling tower associated running system, from the aspects of technical and economic, system design energy efficiency ratio (DEER), cool capacity transmission system design energy efficiency ratio (SEER), it analyses the energy efficiency effect of the system.Secondly, this paper studies the distribution disciplinarian of soil temperature, analyzes the soil heat transfer characteristics from the theory, and calculates the soil temperature distribution disciplinarian of original projected temperature of soil. In accordance with unlimited wall heating transfer model theoretical, in about 10 meters below ground level temperature stabilized basic state.In the RC region, in the summer, relatively to the test well 0, the range about the changes in underground temperature was [-1.45%, 1.2%]; In winter, the underground temperature changes in the range of [-0.92%, 0%]; 10 within the scope of the following, basically stabilize temperature, about 21.3°C in summer, about 18.5°C in winter. In the winter half-load circumstances, the soil stors heat has been gradually absorbed by the use of fluid, temperature decrease. By testing three test wells, the underground heat exchanger, the difference in temperature of water was the average of 0.2 to 0.3°C; the total volume of 276 m3 / h circumstances, the average U-shaped pipe underground heating capacity of single-hole was average of 5 W / m.In winter the whole load circumstances, under the 29 m deep underground, soil temperature was 18.10°C on average, lower about 0.2°C than the results of 2006's winter testing, also slightly lower than the state of the half-load soil temperature, mainly due to the building load increasing, so the heat absorpted to the soil increased.In the transition seasons, the basic non-use of air-conditioning, it is conducive to the underground soil to come back.When running in the summer, the system reached the total volume of 454 m3 / h, the average temperature of the inlet temperature was 31.45°C and the outlet temperature 28.94℃, underground U-tube heat exchanger average capacity reached 67.65 W / m.And then, by establishing the three-dimensional transient heat transfer model of a U-shape tube heat exchanger, it simulates the water temperature changing of the inlet and outlet of the U-shape tube heat exchanger, the soil temperature changing, and the changing disciplinarian of the effecting depth and effecting radius of the U-shape tube heat exchanger in soil of the respective single U-shaped tube and tube group under the two circumstances of cooling in summer and heating in winter.It also simulates the fire pool connecting with the whole GSHP air-conditioning system, analyses the distribution disciplinarian of the water temperature in the fire pool while storage heat in the winter and storage cool in the summer, and puts forward the better separate program and optimization design program for the fire pool; While the tests proved the water temperature distribution.Finally, it analyses the examples of RC hospital projects operating mechanism, and has good results when system under intermittent operation.Analyse the problem of the system and raise more appropriate option, summed up the shortcomings of the"Technical code for ground-source heat pump system", and draw lessons.
|
PDF Full Text Request