Research On Energy-saving Operation Of Air-conditioning Water System In Large District

With the improvement of the social and economic level in China, and the increased demands of the people's living environment and work place, the central air-conditioning system has made rapid application at the same time, so the people pay attention to the central air-conditioning system energy consumption now.The characteristic of the air-conditioning system is that it runs in a long time which the load is partial. Therefore, it can reduce energy consumption through changing the flow in the water system . The variable water system can change the cold flow which is transported to the user. Also ,the pump can adjust its running speed or number ,according to the actual flow in the water system .Because it's complicated in the design and operation of the variable water system, now there are still many issues that should be studied . This paper mainly study the regional variable water air-conditioning system from five aspects in the following: 1. use a software- Dest-h to simulate regional air- conditioning cooling load hourly, so that we can study the characteristic of the air-conditioning load;2. analyse the terminal devices and the control valve in the variable flowing system, so that we can find the relationship between the flow and the load ;3. study the control strategy of the the variable water pipe network system, and put the emphasis on the analysis of the control strategy that the control pressure is constant;4. study how to match the the pump with the variable water pipe network system and analyse the operation condition of different pumps in the pump operation mode ;5. use dynamic economic analysis methods to set up a economic analysis model of the air-conditioning water pipe network system .Combining with the analysis of a specific project examples ,we can know that in a pipe network system, using a pump that speed is contant and a pump that the speed is changeable, the economic benefits is the best.