热泵
地温梯度
热交换器
叠加原理
热容率
核工程
地热采暖
机械
工程类
板式换热器
环境科学
地热能
机械工程
地质学
数学
物理
地球物理学
数学分析
出处
期刊:Journal of Shandong Institute of Architecture and Engineering
日期:2001-01-01
被引量:3
摘要
A main challenge for GSHP application is the design and performance simulation of the geothermal heat exchangers. Being simple and effective for most engineering applications, the line source model is presented for prediction of the temperature response in the ground around the geothermal heat exchangers. Variable and discontinuous loads can be approximated by a series of rectangular pulses of heating or cooling. Then, superposition is used to deal with such variable and discontinuous loads. Simulations indicate that the maximum temperature rise after a period of cyclic heating of the ground can be approximated by the superposition of a continuous mean load and a single heating pulse. This approach is desirable for engineering applications to deal with long but discontinuous load to geothermal heat exchangers. An ideal situation for the geothermal heat exchanger is also simulated of balanced heating and cooling loads in the years around. On such a condition the heat extracted from and rejected to the ground offsets each other, and there is no net heat accumulation in the ground after long duration of operation. Such a design or operation scheme is favorable for keeping the heat exchanger at high efficiency over its lifetime.
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