Study On The Annual Dynamic Energy Consumption Of Multi-connected Air-condition System

With Chinese economy developing rapidly and the people's living level rising continuously, building energy consumption has been larger and larger a constituent in the gross domestic energy consumption. Therefore, building energy saving and consumption reduction has been effected as one of the government's crucial measures in order to realize the strategy of sustainable development and alleviate the enormous pressure of energy resource crisis. As the energy consumption of building heating and the air-condition holds 50%-70% of the overall consumption, improving the work efficiency manifests itself as an effective means by which to reduce the consumption. And Multi-connected air-condition system, standing out as saving energy, highly efficient, flexible to use and simple to maintain and care, has been put into practice in a great deal of domestic projects. However, the domestic north area multi-connected air-condition systems are mainly applied in summery refrigeration while the cases of year-long running projects are inadequate, with the studies concerning the wintry running energy consumption even more inadequate. In this consideration, the author chooses to undertake an analyzing study on its year-long dynamic energy consumption in this thesis so as to probe its advantage in saving energy as opposed to other air-condition systems and meanwhile promote its expansion in China. Thus this thesis renders itself significant both in theory and practice, and its contents come as below:Firstly, Construct the building model according to real parameters and using the DeST software calculate the dynamic load and the interior and outdoors air parameters of the building . Work out the annual dynamic consumption of the studied building under simulated working conditions through numerical calculation according to the equipment capacity table provided by the factory.Secondly, through the electricity expense computation system of the multi-connected air-conditioning system, measure the system's real dynamic consumption and contrast it with the simulated result, then analyze the error between and thus undertake examination and adjusting on the building model, ensuring the error lie within the allowed scope between the simulated result and the real consumption data.Thirdly, analyze the advantages and disadvantages of the multi-connected air-conditioning system with the comparing of its simulated energy consumption with those of the other systems. Fourthly , choose five cities of different climatic conditions and simulate the dynamic energy consumptions of the multi-connected air-conditioning system there respectively, then compare them with those of the other three systems so as to get the conclusion whether the system is suitable for seasons in those areas or not.As the result manifests, with the methods in the thesis, simulation of the dynamic energy consumption can satisfy the requirements in engineering application. Opposed to traditional air-conditioning systems, this very system is effectual in saving energy. However, in this effect its superiority isn't obvious compared with the water source heat pump, especially the overall energy consumption of it is higher than that of the ground source heat pump, while its consumption depends on various factors, with different performances in different area and different season . Therefore, when using the system in different regions in China, we shall adjust the measures to the local conditions with a sufficient understanding.