Adaptable Technologies Of Cooling And Heating Directly By The Natural Energy In The Hot Summer And Cold Winter Regions

The hot summer and cold winter regions have their own typicalcharacteristics that they are cold and wet in winter,and muggy in summer.In order to improve the indoor thermal environment, people in theseareas install heating and air conditioning equipment by themselves.Butthis has resulted in a rapid growth of energy consumption for the heatingin winter and cooling in summer in recent years. In this context, to meetpeople’s need of healthy and comfortable indoor environment, rationalusing of natural resources so as to protect the environment and reducingconventional energy consumption has become an important issue inHVAC industry in the hot summer and cold winter regions.The paper starts with climate characteristics, energy consumptionstatus, natural cold and heat resources reserves in hot summer and coldwinter regions and so on. Then it introduces various direct-applicationtechnologies and the research status at domestic and abroad in detail. Andit emphatically analyses the effect and applicability of the nightventilation technology and the direct-application technology of usingriver water for cooling in hot summer and cold winter regions.By designing multi-condition experiments, a room within an officebuilding in Zhuzhou city is used to conduct ventilation experiments. Theexperimental results show that night ventilation in summer has a goodeffect on the reducing of night indoor temperature and the indoor daytemperature peak, the night mechanical ventilation can reduce theaverage indoor temperature by2.1℃at night, and when combining withthe application of sunshade technology, thermal environment can begreatly improved all day long. At the same time, this paper carriessimulation analysis on the experimental room based on an energysimulation software——DesignBuilder, through the comparisonbetween experiment data and simulation data, it can be concluded thatnight ventilation plays a very positive role in improving the indoorthermal environment; the ventilation in the transition season for thebuildings including heat source has remarkable effect on theimprovement of the indoor thermal environment, and full-day ventilationcan satisfy personal requirement on indoor thermal comfort; by the simulation analysis on the effect factors of night ventilation, it canconcluded that construction parameters have the biggest effect on thenight ventilation, followed by the technology parameters; The airconditioning plan combined with night ventilation and optimizedpalisade structure can save nearly22.9%of power consumption, theenergy saving effect is very significant.The direct application of river water for cooling is always limitedby geographical conditions. This paper takes a specific project as anexample, by detailed calculating the actual cooling capacity of the fancoil in the non-standard conditions running, and making a concreteanalysis of indoor thermal comfort while using this air conditioningsystem, the result comes to the conclusion that the river water directlycooling methods can meet the demand for indoor cooling with a lowerPPD rate, and has great feasibility in the water rich zones in hot summerand cold winter regions.