subject: Residential Energy Efficient Ground Source Heat Pump Type Of System Design [print this page] Residential Energy Efficient Ground Source Heat Pump Type Of System Design
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Abstract: The ground source heat pump is an efficient energy-saving, environmental protection and to achieve sustainable development of new technology, It will not pollute the groundwater, it will not affect the land subsidence. In this paper, ground source heat pump air conditioning systems account several key issues discussed, the system design and operation of control technology is analyzed.
I. Introduction Ground source heat pump is the underground soil layer for the cold (hot) source of the buildings heating, hot water and air supply technology. As we all know, under formation of a relatively stable throughout the year, maintaining the temperature. In summer, the temperature of ground surface air temperature is lower than in the winter than the air temperature is high. Ground Source Heat Pump is the use of this feature of the earth, buried in the ground through the heat exchanger, heat exchange with the soil or rock. Ground source heat pump operating conditions stable throughout the year, without other auxiliary heat source and cooling equipment can be realized in winter heating, summer cooling. Therefore, ground source heat pump is an efficient energy-saving, environmental protection and to achieve sustainable development of new technology, It will not pollute the groundwater, it will not affect the land subsidence. In winter, the pipeline will be underground heat the liquid out, and then into the building through the system, while Xucun cold to prepare for summer use; in the summer, heat from the building out of the building, through the system into the ground, while Xucun heat to prepare for winter use. Ground source heat pump throughout the year can provide a reliable high-quality cold and warm air, as we create a very comfortable indoor environment. Therefore, the ground source heat pump has been extensive development, especially for residential central air conditioning as cold (hot) source.
Ground source heat pump is a long history, the United States as early as the beginning of the last century began on the performance of ground source heat pump, ground source heat pump in the United States has become a mature, fully developed industrialized technology. By 2001 only, has installed 400,000 platform source heat pump, and also to steady growth rate of 10% per year. In the Nordic countries such as Sweden, 90% of the housing with ground-source heat pump. In contrast, our research on ground source heat pump will have to much later, until the 80s of last century it began only some units system. Domestic ground source heat pump to begin exploratory study, but in how to effectively reduce the initial investment, to ensure reliable operation of the system such as the research has not been a breakthrough. The main reason is that most have been limited research carried out experiments on the establishment of performance test systems and air source heat pump with the performance of the traditional technical and economic comparison, energy-saving ground source heat pump to draw general conclusions. In the absence of underground heat exchanger in the soil complex heat and mass transfer-depth study of an integrated delivery process, so that these conclusions apply only to a specific experimental system, based on data provided by fewer and not as a design basis. Therefore, in ground source heat pump and system development and design, there are many outstanding issues. This article will household water - water source heat pump units, heat exchangers and the air conditioning system of soil development and design of such a simple study.
2, ground source heat pump system
1. Loop ground source heat pump systems introduction and selection
Loop ground source heat pump system according to the form can be divided into: closed circulatory system, open circulatory system and the hybrid system.
1.1 Closed circulatory system Closed circulatory system is cold (hot) source side of the circulating water in the outdoor heat exchanger unit and ground source closed loop formed between heat exchanger. Pipe buried underground through vertical wells 150-200 feet deep, or the level of 4-6 feet buried in the ground, you can also set the bottom of the pond. In winter, the tube fluid extract heat from the ground, into the building, while in summer heat within the building sucked through pipes into the underground storage; the pipe for high-density polyethylene pipe or other pipe corrosion as transportation and ground-source heat exchanger material. Most ground-source heat pump cold (heat) source side of the closed loop heat transfer system is used.
1.2 open circulatory system
Open circulatory system is its water pipeline from the lake, river or the shaft into the water, in order to cycle the same way and closed the building after the exchange of heat, water flow back to the original place, or discharge to other suitable locations.
