A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development

Thesis (M.Eng.) - Asian Institute of Technology, 1989

Respiration rates of "Nam Dok Mai" mango variety were measured at different temperatures of 13 , 20, 27 and 34 °c in controlled chamber by using gas chromatography. The relative humidity in chamber was maintained at 94% by 9.5% NaCl solution . Heat of respiration was determined by the calorimetric method. The concentration of carbon dioxide in a exiting air from the calorimeter was measured. A corresponding respiratory heat generated and carbon dioxide evolved was calculated to provide information on conversion of respiratory rat e to respiration heat. The heat liberated was 11 . 262 J/mg C02. A respiratory heat equation for mango was d e v e lope d as a function of storage temperature a nd time . Weight loss and transpiration coefficient of mango storage in a commercial cold storage was studied . The mangoes were stored individually in each chamber maintained at different relative humidities of 100 , 97, 94 and 91% by using 0, 5, 9.5 and 14% NaCl solution. Transpiration coefficients decreased with increase in water vapor pressure difference. A energy demand mod e l was written in BASIC program for refrigeration load calculation to identify each product load , each storage day a nd energy used for a cold storage. An application of relationship of respiratory heat to predict the h eat l i berated of "Nam Dok Mai" mango was performed in this model .