Abstract: A refrigeration system includes a first evaporator for evaporating a first refrigerant. The pressure exerted by the evaporated first refrigerant is used to drive a gas-driven diaphragm pump. The first refrigerant leaving the diaphragm pump is cooled and condensed by a first condenser which receives evaporatively cooled air. A motor-driven pump circulates the first refrigerant in liquid form from the first condenser back to the first evaporator. The diaphragm pump compresses a second refrigerant in gaseous form, and the compressed second refrigerant gas is circulated to a second condenser for liquification. The liquified second refrigerant is circulated to a second evaporator for absorbing heat from the medium to be refrigerated, causing the second refrigerant to evaporate to a low pressure gas which is returned to the diaphragm pump.