(火积)分析在空调系统运行优化中的可行性研究

为优化空调系统运行,基于(火积)理论,本文提出空调系统(火积)增加极值原理,构建空调系统各部件(火积)损失率计算模型,并得到空调系统整体(火积)增加率计算模型。实验分别研究了在给定系统制冷量和给定系统输入功率条件下,空调系统在不同运行工况下的(火积)增加率,较好地验证了空调(火积)增加极值原理,并得到了空调系统最佳运行工况。结果表明:当系统制冷量为5 k W时,最佳运行工况为压缩机频率70 Hz,冷冻水流量0.6 kg/s,冷却水流量0.9 kg/s;当系统输入功率为2.8 k W时,最佳运行工况为压缩机频率97.9 Hz,冷冻水流量0.41 kg/s,冷却水流量1.00 kg/s。

Feasibility Study on Entransy Analysis Applied in the Operation Optimization of Air Conditioning Systems

To optimize the operation of air conditioning systems, the extremum entransy increase principle is proposed, and an entransy loss model for each component and entransy increase model for the whole system are established for air conditioning systems based on entransy theory. The entransy increase rate of the air conditioning system under different operation conditions is experimentally studied when the system cooling load and total power consumption are fixed separately. The results prove that the extremum entransy increase principle holds and determine the optimal operation conditions. When the system cooling load is 5 kW, the optimal compressor frequency is 70 Hz, optimal chilled water flow rate is 0.6 kg/s, and optimal cooling water flow rate is 0.9 kg/s. These parameter values produce the minimum system entransy increase rate, minimum power consumption rate, and maximum system efficiency. When the system power consumption is 2.8 kW, the optimal compressor frequency, chilled water flow rate, and cooling water flow rate are 97.9 Hz, 0.41 kg/s, and 1.00 kg/s, leading to the maximum system entransy increase rate, maximum system cooling load, and maximum system efficiency.