A multi-storied shopping mall has installed 5 x 110 TR reciprocating compressors of which  four compressors are in use and fully loaded for 14 hours per day. The specific power  consumption of reciprocating compressor is 0.8 kW/TR. Due to higher energy cost the  shopping mall chief engineer has decided to replace reciprocating compressors with screw  compressors having specific power consumption of 0.65 kW/TR. The chief engineer needs the following input from energy consultant:  • Comparison of power and electricity consumption of both reciprocating and screw  compressors?

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Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.