Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China.
Water Sci Technol. 2012;66(5):1103-9. doi: 10.2166/wst.2012.294.
Due to the surface water in the upper reaches of Yangtze River in China containing large amounts of silt and algae, high content of microorganisms and suspended solids, the water in Yangtze River cannot be used for cooling a heat pump directly. In this paper, the possibility of using Yangtze River, which goes through Chongqing, a city in southwest China, as a heat source-sink was investigated. Water temperature and quality of the Yangtze River in the Chongqing area were analyzed and the performance of water source heat pump units in different sediment concentrations, turbidity and algae material conditions were tested experimentally, and the water quality standards, in particular surface water conditions, in the Yangtze River region that adapt to energy-efficient heat pumps were also proposed. The experimental results show that the coefficient of performance heat pump falls by 3.73% to the greatest extent, and the fouling resistance of cooling water in the heat exchanger increases up to 25.6% in different water conditions. When the sediment concentration and the turbidity in the river water are no more than 100 g/m3 and 50 NTU respectively, the performance of the heat pump is better, which can be used as a suitable river water quality standard for river water source heat pumps.
由于中国长江上游的地表水含有大量泥沙和藻类，微生物和悬浮物含量高，因此长江水不能直接用于热泵冷却。本文探讨了利用中国西南城市重庆境内的长江作为热源-汇的可能性。分析了重庆地区长江的水温及水质，并对不同泥沙浓度、浊度和藻类物质条件下水源热泵机组的性能进行了实验测试，提出了适应节能热泵的长江流域水质标准，特别是地表水质标准。实验结果表明，热泵的性能系数最大下降 3.73%，换热器中冷却水的污垢阻力最大增加 25.6%。当河水的泥沙浓度和浊度分别不超过 100g/m3 和 50NTU 时，热泵的性能更好，可以作为适用于江水源热泵的合适河流水质标准。
