Refrigerant-134a enters the condenser of a residential heat pump at 800 kpa and 50◦cat a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3◦c. the refrigerant enters thecompressor at 200 kpa superheated by 4◦c. determine (a) the isentropic efficiency of thecompressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heatpump.

1

explanation:

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the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only