低温河水的量及其利用分析

Analysis of the exergy and utilization of river water with low temperature

针对与大气环境存在温差的地下水或地表水,采用概念建立水的值计算模型,将水的比在T-s图上进行演示与分析,并对具体地区的低温河水的量进行计算,从理论和实践2个方面证明直接利用河水供冷的中央空调的节能机制和效果。分析表明:无论是在夏季还是在冬季,与大气环境存在温差的地下水或地表水的物理比值总是为正,利用它们作为热泵或空调的冷热源,就等于向空调系统输入了;低温河水蕴含的量非常巨大,应鼓励积极开发利用这类可再生能源,发展自然冷源空调和水源热泵机组,以达到经济发展与节能减排双赢的效果。

Focused on groundwater or surface water,which is different in temperature from the atmospheric environment,develops calculative model for exergy of water by adopting the concept of exergy,illustrates and analyzes the specific exergy of water on T-s diagram,and computes the amount of exergy of river water at low temperature in specified district.Exposites the energy-saving mechanism and results of the air-conditioning system using river water to cool room directly in theory and in practice as well.The analysis indicates that no matter in summer or winter,the exergy of groundwater or surface water that has different temperature relative to atmospheric environment is always positive quantity,and the water＇s use in heat pumps or air-conditioning systems as cold or heat source equals to inputting some exergy to the systems;low temperature river water contains a very large amount of exergy,and the utilization of this kind of renewable energy,developing the air-conditioning of natural cooling resource and water source heat pump unit should be inspired so as to achieve win-win effect of economic development,energy-saving and emission reduction.