A heat engine receives 1000 BTU of heat from a reservoir at

A heat engine receives 1000 BTU of heat from a reservoir at 1000R. Due to heat transfer effects, this heat is received by the heat engine at 900R. What is the entropy change of the universe due to this heat transfer process?

Solution

HEAT ENGINE RECEIVES 1000BTU OF HEAT

ON CONVERSION BTU TO KJ

1000 BTU=1055.06KJ

ON CONVERSION 1000R TO KELVIN

1000R=555KELVIN

900R=500K

CHANGE IN ENTROPY=S surroundings =dSsurroundings=q surroundings/T surrounding=

S=Q/T=1055.06/500=2.11012KJ/K