The present work concerns parametric analysis and case study of the performance of a newly suggested Multi Drain Heat Recovery System (MDHRS) that uses the relatively hot water of different drain sources such as the shower, the dish washer, the washing machine, and the sink simultaneously to heat/preheat residential cold water. To proceed, an appropriate thermal modeling along with its associated in-house code are developed. The heat rate error between numerical and experimental results is always below 14.2% for different inlet cold water temperatures and for different cold and hot water flow rates. The parametric analysis performed treated the effect of the hot and cold water inlet temperatures and flow rates on the performance of the system and allowed to raise practical recommendations in terms of application of the suggested concept. In the case study presented, the monthly amount of energy reduced, the monthly amount of money saved and the monthly amount of CO₂ emissions reduction are considered. It was shown that when the heat exchanger length increases from 0.2 m to 1 m, the monthly amount of reduced energy increases from 102.2 kWh to 410.9 kWh, the monthly amount of money saved increases from 13.3 $ to 53.4 $ and the monthly amount of emissions reduction increases from 72.5 kg to 291.7 kg for a drain water temperature of 25 °C for the case of Lebanon.

当前的工作涉及对新建议的多排水热回收系统（MDHRS）的性能进行参数分析和案例研究，该系统使用不同排水源（如淋浴，洗碗机，洗衣机和水槽）的相对热水同时加热/预热住宅冷水。接下来，开发了适当的热模型及其相关的内部代码。对于不同的进口冷水温度以及不同的冷热水流量，数值和实验结果之间的热效率误差始终低于14.2％。进行的参数分析处理了热水和冷水入口温度和流速对系统性能的影响，并就提出的概念的应用提出了实用的建议。考虑了_2种减排。结果表明，当换热器长度从0.2 m增加到1 m时，每月减少的能耗量从102.2 kWh增加到410.9 kWh，每月节省的金钱量从13.3 $增加到53.4 $，并且每月排放量增加黎巴嫩的排水温度为25°C时，减少量从72.5 kg增加到291.7 kg。