论文部分内容阅读
在空调房间空调效果不变的情况下,为了使冷水系统运行时的能耗最小,应对风机盘管空调冷水系统在一定条件下的最佳供回水温度进行计算。本文首先以传热学和流体力学理论为基础,对风机盘管、冷水机组和水泵在不同冷水供回水温度下运行时的能耗进行了计算,得到了不同冷水供回水温度和不同水泵扬程工况下的冷水系统单位制冷量能耗计算表达式,而后绘制了相应的能耗变化曲线。分析可知:在本文的计算条件下,当水泵扬程为147、196、245和294 kPa(15、20、25和30 mH2O)时,系统单位制冷量的能耗随温差的增大而增加;当水泵扬程为343和392 kPa(35和40 mH2O)时,系统单位制冷量的能耗在供回水温度为6.14/12.14℃时最小,该数值与设计时的7/12℃不同。因此,为了使系统运行时的能耗最小,应根据冷水机组的实际运行工况、系统的阻力损失,以及所要达到的空调效果来确定冷水的供回水温度。
In the case of air conditioning room air conditioning effect unchanged, in order to minimize the energy consumption of the operation of the cold water system, to deal with the fan coil air conditioning cold water system under certain conditions, the optimal supply and return water temperature calculation. Based on the theory of heat transfer and fluid dynamics, this paper calculates the energy consumption of fan coil units, chillers and water pumps when operating at different cold water supply and return water temperatures, and obtains the results of different cold water supply and return water temperatures and different water pumps The head of the cold water system under refrigeration unit energy consumption calculation expression, and then draw the corresponding energy consumption curve. Analysis shows that the energy consumption per unit of cooling capacity increases with the increase of temperature difference when the lift of pumps is 147, 196, 245 and 294 kPa (15, 20, 25 and 30 mH2O) under the calculation conditions in this paper. When the pump heads are at 343 and 392 kPa (35 and 40 mH2O), the energy consumption per unit of cooling capacity is the minimum at the supply / return water temperature of 6.14 / 12.14 ° C, which is different from the design of 7/12 ° C. Therefore, in order to minimize the energy consumption of the system during operation, the temperature of the supply and return of the cold water should be determined according to the actual operating conditions of the chiller, the resistance loss of the system and the air conditioning effect to be achieved.