One of the main strategies in design of earth-sheltered buildings is to reduce heat losses in the winter and heat gains in the summer by using the relatively stable thermal conditions of the soil. Additionally, construction work carried out at the site allows a reduction of the installation costs for example for horizontal ground-source heat exchangers for heat pumps. Thus there are considerable advantages in integrating earth-sheltered buildings with horizontal ground-source heat pump systems. The principle objective of the current work is to conduct a design and performance analysis of an energy efficient building with a ground-source heat exchanger servicing the building’s heat pump. The associated computer simulations used two types of temperature boundary conditions: - ambient hourly temperature over 1 year period for Warsaw and - monthly averages of depth-dependent soil temperatures. The design length of horizontal heat exchangers varies between 180m and 300m depending on peak heat load, type of surrounding soil and moisture content. For the purpose of this case study sandy, clayish and loamy type of soils with various moisture contents have been analyzed. A system’s efficiency coefficient has been estimated based on a ground exchanger’s fluid temperature and plant temperature.
|Title of host publication||Proc. 9th Polish Conferences of Science and Technology "Building Physics in Theory and Practice"|
|Place of Publication||Lodz (Poland)|
|Publication status||Published - 2003|