연구홍보포털

논문 초록 (Abstract)

of HVAC is the development of new and renewable energy technologies. Among the various renewable energy systems, ground source heat pump (GSHP) systems have been spotlighted as efficient building energy systems because of their great potentials for energy reduction in building air conditioningand reducing CO2 emissions. However, hi gher initial cost works as a barrier to the promotion of their use. Therefore, it is critical to reduce the initial costs by optim izing the design of the system. In this paper, parameters that affect th e performance of the GSHP system and the size of ground loop hea t exchanger (GLHX) have been investigated. Ratio of GLHX length to unit capacity (L/Q) decreased according to increasing value of the rmal conductivity, but L/Q increased according to increasing value of borehole heat transfer resistance. In cooling mode, L/Q decre ased according to increasing EWT of underground circulating water and borehole distance but increased in heating mode. The value o f L/Q tended to increase according to increasing underground initi al temperature in cooling mode, but decreased in heating mode. L/Q decreased according to increasing U-tube separation distanc e and decreasing underground circulating water flowrate, because the thermal interference effect of underground circulating water and he at absorption and emission rate from the ground decreased. The reduction of the size of GLHX is very important in the aspect of savi ng total installation cost of a GSHP system. Therefore, the size of GLHX and the performance of GSHP system should be considered together f or optimum design of the GSHP system. (C) 2013 Elsevier Ltd. All righ ts reserved.