The Performance Evaluation Of Thermal And Research Of Application Of The Mass And Temperature Separate Controlled Storage

This project aimed to study the thermal performance and preservation effect of the Mass and Temperature Separate Controlled Storage(hereinafter referred to as MTSCS)as the goal.Through the determination of the temperature and humidity and gases distribution in the MTSCS,and the effect of pre-cooling under differential pressures,and the method of preventing frosting when fruits and vegatables outdoing from cold storage,and the effect of fresh keeping of the MTSCS,and the comparison of fresh keeping effect with ordinary cold storage,the MTSCS was better than ordinary cold storage in the thermal performance and fresh keeping,the results showed that:1.The main structure of MTSCS was constituted of the master-storage library,within a set of one to several sub-storage rooms.Both the master-room and sub-rooms were in airtight while the master-room was insulated but the sub-rooms were not.And the thermal mass of temperature regulation was in coupling controlled.So only heat transferability but no mass transferability was present between master-and sub-rooms,and the storage temperature could be controlled at very tiny fluctuation,and the evaporator could be regulated without frost.The maximum temperature difference could be ≤±0.3 ℃ in different heights in sub-storage rooms.The temperature difference could be ≤±0.2 ℃ in the same plane.The temperature difference could be ≤±0.2 ℃ in different heights in the same point.The frosting of the evaporator was 0.21 kg every 10 days in the MTSCS,was 83%lower than in ordinary cold storage.2.It almost was constant relative humidity(RH)in the MTSCS.The RH was 90%～94%,and had no obvious change in different position.The gas atmosphere could be uniform distributed.The gas concentration in every position could be 3%O2 and 8%CO2.which was the optimum gas condition of grape.SO2 could be uniform distributed,which was used pulsed antimildew.The concentration of SO2 was 2000 ppm in four corners and middle of the library.So local fruits damage that could be avoided3.Through the study of pre-cooling under differential pressures found that pre-cooling under differential pressures of 6m double stacking longitudinal without clearance and pre-cooling under differential pressures of 8m single piling lateral could cool 8t grapes from 19 ℃ to 0 ℃.The effect of pre-cooling was 3 heigher than ordinary cold storage.4.Through the study of preventing frosting when fruits and vegatables outdoing from cold storage found that 2 ℃ was the different temperature gradient value that prevent Rad Globe grape frosting.It could be choose back to the temperature directly or gradiently when fruits and vegatables outdoing from cold storage.Improved 1 ℃ of the library in every 2 h,when the temperature of the library was 4 ℃～6 ℃ then got into the library to start sorting.Or backd to the temperature directly to 6 ℃,after 10 h got into the library to start sorting.5.Through the study of the effect of fresh keeping of the MTSCS,found that the MTSCS was better than ordinary cold storage in aspect of fresh keeping.In the 120th days,the Weightlessness rate was 3.3%,the rotting rate was 5.6%,the SSC was 12.8%,the TA was 0.15%,the VC was 27.6 mg/100 g,the residual quantity of SO2 in the peel was 40.9 mg/kg,the residual quantity of SO2 in the flesh 1 was 15.1 mg/kg of the Rad Globe grape storaged in the MTSCS.