PORTABLE REFRIGERATOR

Abstract

Design and fabrication of portable and chargeable refrigerator based on absorption refrigeration cycle containing ammonia water mixture as working fluid. We developed a new schematics of absorption refrigeration according to the need of our project. Our refrigerator contains two chambers connected with a solenoid valve that is controlled with a temperature sensor. In the charging cycle chamber A that contains ammonia water mixture will be heated. This will allow ammonia vapors to leave the mixture and go into chamber B where they will be condensed into liquid due to high pressure. After charging, valve will be closed and the whole system is allowed to cool. During cooling phase valve opens when the temperature of chamber B reaches above 3°C, this will allow ammonia to evaporate which will cause cooling effect. While the ammonia vapors will go to chamber A and dissolve in water. We made the whole system out of Stainless steel to avoid corrosion due to ammonia. Stress analysis and flow simulations were conducted on ANSYS. We have calculated vapor fractions by running simulations on ASPEN HYSYS. Our refrigerator will generate cooling equivalent to 288 kJ per charge, which will last for about 20hrs.