According to Ahmadul Ameen, refrigeration is the from a substance or space to create a temperature lower than the surroundings. While humans have used ice caves and porous pottery for centuries, modern "mechanical refrigeration" uses machines to achieve this effect continuously. 2. The Heart of the System: Vapour Compression
Detailed coverage of Vapour Compression Cycles , Vapour Absorption Cycles , and multipressure systems. refrigeration and air conditioning by ahmadul ameen pdf