Comparison Of Energy Consumption Of Air Conditioning System And Optimization Of Indoor Air Distribution In Tea Brick Fermentation Chamber

Tea brick has been more and more favored by people because of its internal golden flower bacteria health effect.The content of flower bacteria mainly depends on the fermentation environment of tea bricks.Tea bricks fermentation environment can provide a suitable external environment for the reproduction and growth of golden flower bacteria.However,the environmental design and control of existing fermentation chambers mainly depend on production experience and lack of theoretical guidance,which leads to many problems in the environmental control of the fermentation chamber.firstly,uneven indoor temperature distribution results in uneven quality of tea bricks;secondly,the larger energy consumption of air conditioning operation results in higher production costs of tea bricks.Based on the above problems,this thesis takes the fermentation chamber of Jingwei Fu Tea as the research object,and makes an in-depth study on the energy consumption of the air conditioning system and indoor air distribution in the tea brick fermentation chamber.The main research work is shown below.In order to solve the heat and humidity load in the tea brick fermentation chamber,in item of the requirements of the tea brick fermentation environment,the assumption of flow field uniformity was introduced.Under the premise of a uniform flow field,the mathematical model of heat and moisture exchange between a single tea brick and the fermentation environment was established through the heat and humidity coupling exchange theory of porous media.The heat and humidity exchange rate of a single tea brick was calculated.The heat transfer load of the building envelope is calculated according to the outdoor meteorological parameters.Based on the above two kinds of load,the indoor heat and humidity load of tea brick fermentation chamber in different seasons was determined.Under the condition of known indoor heat and humidity load,the energy consumption of two types of actual operation air-conditioning systems was compared and analyzed based on outdoor weather parameters.The results show that the ORCS saves energy by30.8%-45.6% compared to the CAS in the transition season and winter;however,in summer,the CAS saves energy 22.3% than the ORCS.According to the result,the energysaving operation strategy of the air-conditioning system of the tea brick fermentation chamber is given.Under the condition of energy saving operation of the system,in order to form a uniform and suitable fermentation environment,the study introduced the upward vertical wall attached ventilation according to the indoor load distribution characteristics and the actual placement of tea bricks.A three-dimensional mathematical model of air flow and heat transfer in the fermentation chamber was established.The temperature distribution of the tea brick fermentation chamber was analyzed and compared with the diffuser dilute ventilation and displacement ventilation.The results show that the upward vertical wall attached ventilation reduces the temperature unevenness coefficient of the cargo area by54.3%-77.5% compared with the diffuser dilute ventilation and displacement ventilation.Therefore,the uniformity of air distribution in the fermentation chamber has been effectively improved.At the same time,this air supply method increases the energy utilization rate of hot air by 1.7%-18.5%,and achieves the energy saving effect of air supply.This thesis provides a theoretical basis for the accurate calculation of the load of the tea brick fermentation room through the assumption of the uniformity of the flow field.Based on the indoor heat and humidity load,the energy consumption of the air conditioning system was compared,and the energy-saving operation strategy of the tea brick fermentation chamber air conditioning system was given.Under the condition of energy-saving operation of the system,according to the load distribution characteristics and the actual placement of the tea bricks,it is proposed to the vertical wall attached ventilation to improve the uniformity of the air distribution in the fermentation chamber,which provides a basis for the design of the air distribution in the tea brick fermentation chamber.