開式冷水型轉(zhuǎn)輪除濕空調(diào)理論與實(shí)驗(yàn)研究
[Abstract]:Runner dehumidification air conditioning is an effective way to adjust the humidity of production and living environment and realize the independent control of temperature and humidity.How to improve the efficiency of energy conversion and enhance the capacity of heat and humidity treatment is an important research direction of runner dehumidification air conditioning. In order to solve the problem, an "open-type cold-water type runner dehumidification air conditioner" is proposed, which combines the characteristics that isothermal dehumidification can minimize the irreversible loss of drying and dehumidification process and that regenerative evaporative cooling tends to be reversible under ideal conditions. Independent control of temperature and humidity is driven by low-grade thermal energy.
Firstly, the thermodynamic analysis of the typical ventilated runner dehumidification air conditioning cycle is carried out, and the thermodynamic analysis method and evaluation index suitable for the runner dehumidification air conditioning are formed. The open-type cold-water runner desiccant air conditioning cycle is developed and cooled. The air conditioning mode is to deal with the latent heat load of the air through the two-stage runner dehumidification process, while the sensible heat load is to use the modified regenerative evaporative cooling process to produce chilled water. Hybrid dehumidification air conditioning with wheels has the similarity, which is to deal with the latent heat load of the air through the two-stage runner dehumidification process, and then the sensible heat load of the air; the main difference is the treatment of sensible heat load, the two-stage runner hybrid dehumidification air conditioning is the introduction of air-source heat pump and other traditional air conditioning equipment, the open-type cold water runner. Compared with the traditional runner dehumidification air conditioning system, the refrigeration and air conditioning capacity and energy utilization efficiency of the open-type cold-water runner dehumidification air conditioning system are greatly improved. Compared with the two-stage runner dehumidification air conditioner, the thermal performance coefficient and exergy efficiency of the open-type cold-water runner dehumidification air conditioner increase by about 30% under the same air supply condition and refrigeration capacity.
Secondly, the research on the approximate air conditioning system of the open-type cold-water runner dehumidification air conditioning system based on the two-stage runner dehumidification and air-source heat pump hybrid air conditioning is carried out. Through the experimental test under typical working conditions, the seasonal thermodynamic performance analysis and applicability discussion, the operating characteristics of this type of air conditioning system are explored, which is the follow-up open-type cold water type. The research on the runner dehumidification air conditioning lays a feasible foundation and reference, and also provides support for the two-stage runner hybrid dehumidification air conditioning in the utilization of low-grade thermal energy such as solar energy. The hybrid dehumidification air conditioning with two-stage runner is composed of auxiliary cooling equipment. When driven by solar energy, the hybrid dehumidification air conditioning with two-stage runner not only has high energy efficiency, but also has good applicability. Under typical climate conditions, the average thermal performance coefficient of the hybrid dehumidification air conditioning system in summer is about 0.9, corresponding to the sun. The contribution rate and power saving rate are about 30%.
Thirdly, the experimental device of the open-type cold-water runner dehumidification air conditioner is set up, and the process of making cold water based on the two-stage runner dehumidification and regenerative evaporative cooling is tested. The thermal performance of the new-type open-type cold-water runner dehumidification air conditioner and the traditional two-stage runner dehumidification air conditioner is compared and analyzed, and the opposite-type cold-water runner dehumidification air conditioner is completed. The test results show that the cold water produced by the open-type cold-water runner dehumidification air conditioner can effectively realize sensible heat load treatment and can be used as a substitute for the two-stage runner mixed dehumidification air conditioner. The thermal performance coefficient of the open-type cold-water runner desiccant air-conditioning is 0.8-0.9, and the air supply temperature is much lower than that of the traditional two-stage runner desiccant air-conditioning under the same humidity. Especially in humid and high humidity conditions, the traditional system has insufficient apparent heat treatment capacity, less effective refrigeration capacity, and needs higher-grade thermal energy drive. The new system overcomes this problem and is more conducive to the utilization of low-grade thermal energy.
Finally, on the basis of theoretical analysis and experimental research, the mathematical model of open-type cold-water runner dehumidification air conditioner is established, and the heat and mass transfer characteristics, accessible area and heat and humidity treatment capacity of the open-type cold-water runner dehumidification air conditioner are analyzed. The open-type cold-water runner dehumidification air conditioner and the traditional two-stage runner dehumidification air conditioner are compared. The difference of heat and humidity treatment ability indicates the improvement degree of the new air conditioning mode in heat and humidity treatment ability (especially the apparent heat treatment ability). The analysis of accessibility area shows that the open-type cold-water runner dehumidification air conditioning has good applicability, and the 50-90oC heat source can basically meet the driving requirements in mild, humid and humid climates. Compared with the traditional runner dehumidification air conditioning, the open-type cold-water runner dehumidification air conditioning has a great advantage in the treatment of sensible heat load, which is conducive to breaking through the limitation of the traditional system inherent (especially under high humidity conditions) in the lack of sensible heat treatment capacity.
【學(xué)位授予單位】:上海交通大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2013
【分類號】:TU831.4
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