Study On The Matching Of Self-sustained PV Air Conditioning System With Building Thermal Performance In Extreme Hot-humid Climate

Different from the continental climate regions,in the low latitude and hot-humid regions,the annual air temperature is constant,the daily difference of air temperature is small;But the solar height angle is steep,the solar radiation is strong.It is one of the effective measures to improve the indoor thermal environment.For the remote and isolated areas which the power grid is immature,if we can develop a self-sustained system for building air conditioning based on photovoltaic utilization,means that self-produced and self-used,it can effectively solve the power problem of the local summer air conditioning.It is the key for building self-sustained to study the matching relationship between PV system,air conditioning system and building thermal engineering,which is of great significance for the self-sustained building design and the solar building research.The reasonable design and calculation method of the PV air conditioning system can effectively solve the dual problems of the air conditioning power consumption and PV power fluctuations,which is the core of studying the matching relationship of self-sustained PV air conditioning building.In the low latitude and hot-humid regions,the current building energy-saving standards and energy-saving strategies are not applicable,the building energy-saving requirements and the building thermal optimization methods are different.Therefore,the cooling load reduction strategy is an effective way to reduce the building energy and improve the self-sustained effect of building.This paper analyzed the basic principle and energy supply law of the photovoltaic power generation system,on the basis of the dynamic balance theory analysis of building air-conditioning system energy consumption and PV system energy supply,the design and calculation method of the self-sustained PV air conditioning system is studied and established.Energy balance is done in monthly units.The demand capacity of PV panel under different cooling load and air conditioning system conditions and the maximum installed capacity of PV array under different roof conditions are calculated.In contrast,when the demand capacity is less than the installation capacity,the requirement of self-sustained can be met.Based on this,this paper studied and developed a PV air conditioning building self-sustaining calculation software,and the several kinds of air conditioning energy balance results were given with the cooling load index from 50-200W/m~2 in the residential buildings and office buildings,and analysis the matching results,proposed self-sustained PV air conditioning building optimization method.In this paper,the optimum angle of PV panel is calculated for flat roof and 3 kinds of PV installation conditions are given.At the end of this paper,the optimization method of self-sustained PV air conditioning building is given.At the same time,based on the meteorological conditions of low latitude and hot-humid areas,the thermal optimization of building envelope is studied.The simulation of different envelope parameters influence on the cooling load of the building in hot-humid area were studied,and the strategy of load reduction by step is established.We use the Energyplus software,established the different architectural model to obtain the energy saving potential of building envelope in different shape parameters,including the aspect ratio,the building height,window-wall ratio.The energy saving effect of building envelope energy saving technology is analyzed by simulation,including exterior wall,window,shading and roof.The energy saving methods of various envelope structures are analyzed to obtain the best energy saving strategy.The overall energy saving strategy of buildings in low latitude and hot-humid areas is obtained,and a systematic energy-saving method is established from the exterior form of building to the thermal performance of each part of envelope.This research through theoretical analysis,numerical simulation,optimization analysis and software development,the design calculation method and matching optimization method of PV air conditioning building self-sustained are mastered.And systematically master the construction load reduction strategy and energy saving method in low latitude and hot-humid areas,which lays a foundation for the self-sustained PV air conditioning building design.