Application Research On Combined Cooling By Fan Coil And Floor Radiation In Severe Cold Area

The heating period in severe cold areas of our country is long,and traditional heating methods cause a lot of waste in terms of economy and energy,and some buildings require cooling in summer.In recent years,due to the improvement of living standards,people's requirements for the living environment have become higher and higher,the demand for household air conditioners has increased sharply,and the use of fossil energy has made environmental problems increasingly severe.The traditional air-conditioning system is obviously unable to meet our requirements,and the application of renewable clean energy can effectively alleviate current energy and environmental problems.Heat pump technology has developed rapidly in my country in recent years,mainly classified into land(water)source heat pumps and air source heat pumps.With the increase in the types of cold and heat sources,in order to choose the matching end,many new forms have appeared on the basis of the traditional end,from the initial single end to the joint end.In this paper,through theoretical analysis and experimental measurements,the summer cooling capacity and comfort under different terminal conditions are studied.Calculate operating costs and initial investment based on measured data,compare them with traditional air-conditioning systems,and combine economic analysis to make recommendations for subsequent joint terminal research.In this experiment,the air source heat pump is used as the cold and heat source,and the fan coil and floor radiation are the joint ends to study the applicability and economy of the system in severe cold areas.Among them,the main comparison and analysis of the indoor heat and humidity conditions in summer when the fan coil is the single end,the floor radiation is the single end and the combined end are used.And focused on the analysis of the influencing factors of the floor radiation during summer use.When the floor radiation is a separate terminal,by calculating the indoor dew point temperature hourly,the correlation between the water supply temperature,indoor and outdoor temperature,indoor humidity and other related parameters and the dew point temperature is analyzed.Experiments show that the dew point temperature is greatly affected by humidity.When the floor radiant cooling is operated alone,the indoor humidity is high and the room temperature during the day is high.When the fan coil is a single terminal,the low-level air volume operation analyzes the indoor thermal and humid environment,and calculates the wet load and cooling loadborne by the fan coil.The data through theoretical calculations and actual tests show that when the fan coil unit is operated alone for cooling,the comfort of indoor personnel cannot be satisfied.At the end of the fan coil unit and the floor radiation joint,the temperature of the indoor working area and the non-working area are compared.The result is that the temperature of the working area is in line with human comfort,and the temperature of the non-working area is higher.Experimental data shows that as the operating time of the system becomes longer,the indoor temperature gradually tends to a stable value,and the comfort of the combined cooling system is higher.The formula is used to verify the cooling load borne by the floor radiant cooling system.The theoretical ground temperature is not much different from the measured value,which meets the comfort requirements.According to the experimental results,the economy and comfort are analyzed.Compared with the other two working conditions,the joint end of the fan coil and floor radiation has higher comfort and economy.Through calculation,assuming that the joint terminal system is used in the building where the experimental room is located,the initial investment can be saved by 770,000 yuan,and the operating cost can be saved by1.35 million yuan.The use of fossil energy will be greatly reduced and the energy saving effect will be obvious.