Abstract:

Shallow geothermal energy is a kind of green and renewable energy sources. Groundwater source heat pumps are often used to exploit the new energy. It is well known that AHP can take full advantage of subjective views of experts, but it is also accompanied by the bias caused by human factors. On the contrary, entropy weight method, which is an objective evaluation method, does not reflect preferences of decision makers. Based on AHP and entropy weight method, a new method is put forward, which is the linear weighted summation method. According to the geological and hydrogeological conditions, the groundwater temperature field, the groundwater chemistry conditions etc., the suitability of groundwater source heat pumps in Nanjing is evaluated with the linear weighted summation method. The distribution areas of suitable region, sub-suitable region and unsuitable region are attained. The results provide scientific advice for rational and appropriate application of groundwater source heat pumps.

Key words: shallow geothermal energy, groundwater source heat pump, AHP, entropy weight method, Nanjing City