结果表明，在所选择的六种方案中，水环热泵系统的费用年值最小，是一种最为经济的户式中央空调系统形式；
The results show that the total annual cost of water loop heat pump system is the minimum among the six systems, which is the optimal option under the given conditions.
在水环热泵空调系统中有串联在水环路上的蓄热水箱来改善系统的运行特性。
A heat storage tank was connected in series with the water loop to improve the system running characteristics.
研究结果表明：水环热泵空调系统与传统的中央空调系统相比是节能的。
The developed result shown that WLHP is can saving energy in comparing with conventional central air conditioning system.
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