空调水系统变频运行对各子系统能效的影响分析

The influences of frequency conversion retrofit on the subsystems' energy efficiency of a central air-conditioner

对福州市某办公建筑空调水系统变频改造的节能效果及其对空调各子系统能效的影响进行实测和分析.结果表明,变频改造节能效果明显,在空调日均负荷率约为50%的情况下,整个水输送系统节电率达48.8%,变频节能改造使整个空调系统的能耗下降18.2%,空调水系统能效得到显著提高,对冷水机组的运行能效比没有明显影响,但会使空调末端能效降低.

In the present paper, the influence of frequency conversion retrofit of water system on the energy conservation effects and the subsystems＇ energy efficiency of a central air - conditioner is re- searched experimentally. The results show that the energy conservation effects of frequency conversion retrofit is significant, under the circumstance of the 50% air - condition load rate, the electricity con- sumption of the whole water delivery system can be saved by 48.8%, or the electricity consumption of the total HVAC system can be saved by 18.2%. By means of frequency conversion retrofit, the trans- mission efficiency of the water system is increased evidently, through it does not have a lot effect on the operation efficiency of the water chillers, it still can step down the energy efficiency ratio of end equitments.