地下水源热泵流量经济性分析及地下水有效利用

地下水源热泵具有显著的经济性,但对地下水资源保护产生不利影响。本文建立地下水源热泵流量分析模型和典型的基准状态,从节能和地下水节约利用两方面综合分析设计工况下板式换热器循环流量和地下水流量最佳范围,以及地下水取用单价的合理范围。结果表明：在基准状态下,板换循环设计温差应在5～6℃左右,比10℃温差工况系统能耗减少2.6%;水电单价比为0.2：1时,水费仅占总费用的9%,经济工况区范围为循环水温差在5～7℃之间,井水温差在10～13℃之间;水电单价比在0.5：1到0.75：1之间对提高地下水利用率较为适合;水电单价比为1.5：1时,地下水源热泵与空气源热泵的运行费用相当。

Economic analysis of groundwater source heat pump and effective use of groundwater

The groundwater source heat pump（GWHP） is regarded as an economic technique for space heating and cooling,but has potential risks on the shortages of groundwater resources.The groundwater flow rate model and the typical baseline condition for GWHP are established.The circulation flow rate of plate heat exchanger,the optimal flow rate of groundwater and the reasonable prices range of the groundwater are analyzed under design condition from energy consumption and economical utilization of groundwater.The results show that the optimum temperature difference of plate heat exchanger design is 5~6 ℃ under the baseline condition,at which the energy consumption of GWHP is reduced 2.6% than that of the temperature difference of 10 ℃.When the price rate between water and electricity is 0.2：1,the cost of water fee is only 9% of total operating cost and more cost effective temperature differences are 5~7 ℃ for plate heat exchanger and 10~13 ℃ for groundwater.The appropriate range of the price rate between water and electricity is 0.5：1 to 0.75：1 to promote the utilization of groundwater resources.The operating cost of GWHP is about the same as air source heat pump when the price rate is 1.5：1.