The Cooling And Heating Source Scheme Of Residence Communities In Hot Summer And Cold Winter Zone

The climate presents bipolar in the hot summer and cold winter zone, but thepublic facilities of air conditioning and heating are not perfect. As living standards rise,air conditioning and heating become popluar in this region. And the main appliances areseparated air conditioners and electric heaters. However, there are many shortcomings:1st, separated air conditioner frost in winter, which lowers the COP.2nd thecondensated water makes noise and destroy the exterior wall decoration.3rd, electricheater consumes large energy but comfort is raised smally. In this paper, a new energybus system which adapt to the climate of this area, is designed to solve the the existingproblems of "separated air conditioner&electric heater", while retaining the theadvantages of the independent control mode and billing methods.At the beginning, it analyzes resource applicability used in residence community inhot summer and cold winter zone. The analysis is based on two indicators--resourcecharacteristics and micro environment index. Resource characteristics are the innerproperties of resource itself, which is a kind of universal general criterion. Microenvironmental index is defined from the users’ standpoint, which considers theinfluences caused by the users and residence community. Using the two indicators, itvalues the air, soil, rivers, sewage water and other resources. And the results show that,there is fewer restrictions when using air as the cooling and heating source, and thetechnology is mature. From a long-term perspective, air owns a high volume rateadaptation than other source. In order to avoid the existing problems of air conditioner,it is considered using the air source directly, which adopts the cooling tower.On the base of analyzing resource adaptation, this paper analyzes the advantagesand disadvantages of air conditioner, terminal equipment, transmission and distributionsystem, and a variety of programmes is optimized. And then put forward the “energybus system” complete with "centralized cooling tower","household air source heatpump" and "auxiliary equipment".If the energy bus system can not run normally in winter, there is no engineeringapplication value.In addition, if the efficiency of energy bus is too low to superpass theefficiency of the traditional air conditioner, there is no engineering application value,either. Therefore, it is necessary to demonstrate the feasibility and efficiency of the system.Firstly, this paper establishes the experimental system with cooling tower, watersource heat pump equipment and air conditioning terminal equipment. The heatingexperimental by cooling tower was carried out in Chongqing. It won the relationshipbetween heated water temperature and the air temperature, and the regression equationof volumetric mass transfer coefficient and absorption of heating efficiency, and verifiesthe feasibility of heating. Secondly, from the point of view of theory, analysis of the heattransfer process of air and water in direct contact, further verify the feasibility of heatingby cooling tower in winter.To reduce the complexity of system, this paper puts forward using freshwater asthe heating medium. When the water temperature is lower and the load is bigger, it maycause system device freezing, and can’t run normally. Therefore, this paper uses thematlab numerical calculation program, and analyzes the outlet water temperature indifferent load rate. It sums up the ice period boundaries--wet bulb temperature is5.2℃,which provides the basis for the switch of sources of the energy bus system.On the basis of feasibility of the system, choose SCOPLV’ as the energy efficiencyevaluation index to calculate the the system energy efficiency of energy bus system inair conditioning season and heating season, and compares with the traditional airconditioning. The computing result shows that the energy bus system increases by about1.6%~5.2%. At the same time, the hydraulic stability of the system are analyzed, whichindicates that it is valuable to use the energy bus system in residential area in this region,and this system can replace the current major air conditioning heating mode. In addition,analysis shows that the energy bus system also applies for other climate zones.In general, the energy bus system is proposed for a hot summer and cold winterarea, which keeps the advantages of independent control, independent accounting, andsolve a series of problems existing in traditional conditioner, and it’s efficiency ishigher.