Suitability Of Phase Change Materials For Night Ventilation Cooling Technique

Night ventilation as passive building design methods, it has a low cost, easy toimplement, easy operation at night ventilation technology and regenerative technologies,can make full use of natural resources, improve the indoor thermal environment, andmaintain indoor air quality of the indoor is a low-cost, easy to implement, easy tooperate, and targeted use of resources of the outdoor climate passive energy-savingtechnologies. But how cold night ventilation storage, and the difficulty of the subject.Due to the very close relationship between the night ventilation cooling effectand building heat storage material, therefore, this paper presents the combination ofphase change materials with night ventilation can effectively solve the problem of coldstorage.The phase change material (PCM) is applied to the night ventilation, the use ofphase change materials to improve the thermal storage capacity of the ventilationsystem at night. Energy storage density phase change material, phase transition theprocess approximated as isothermal processes, etc., may be an effective solution to thelack of material regenerator temperature volatile. Meanwhile, by increasing the phasetransition temperature can increase the utilization of the cold source of nighttime.Firstly, based on the theory of building thermal night ventilation effectivetheoretical analysis to determine the main influencing factors and mechanism of action.Secondly, the phase change material with night ventilation coupled analysis ofphase change materials suitable for night ventilation respective physical, chemical andthermal properties. And initially identified in Xi’an area at night the ventilation phasechange material phase change temperature range of22℃~24℃.Initially selected and prepared by the phase-change material suitable for nightventilation of the Xi’an area, through experiments, testing of the primaries materialqualitative, and quantitative analysis. Alcohol-14low my restate Binary Eutecticmixture although phase change latent heat, as180.1J/g,30.23℃, the phase transitiontemperature is not suitable for the Xi’an area at night ventilation found throughexperiments.Finally, a comprehensive analysis of night ventilation thermal properties ofphase change materials, combined with the smallest building heat storage capacity,considering from the phase change Materials and Construction Compatibility, economic,preferably a liquid-solid mixing ratio of65:35mixed paraffin phase change material issuitable for the Xi’an area at night ventilation, and the feasibility of testing and analysis.