Compressed air is used in a heat-pump system to heat water, which is subsequently used to warm a…

Compressed air is used in a heat-pump
system to heat water, which is subsequently used to warm a house. The house
demand is 95,000 Btu/h. Air enters the exchanger at 200F and leaves at 120F, and water enters
and leaves the exchanger at 90 and 125F, respectively.
Choose from the following alternative units the one that is most compact.

a. A counterflow surface with  and a
surface-to-volume ratio of  .

b. A crossflow configuration with the water
unmixed and air mixed having  and a
surface-to-volume ratio of 100 ft2/ft3.

c. A crossflow unit with both fluids
unmixed with &
»

Compressed air is used in a heat-pump
system to heat water, which is subsequently used to warm a house. The house
demand is 95,000 Btu/h. Air enters the exchanger at 200F and leaves at 120F, and water enters
and leaves the exchanger at 90 and 125F, respectively.
Choose from the following alternative units the one that is most compact.

a. A counterflow surface with  and a
surface-to-volume ratio of  .

b. A crossflow configuration with the water
unmixed and air mixed having  and a
surface-to-volume ratio of 100 ft2/ft3.

c. A crossflow unit with both fluids
unmixed with  and
surface-to-volume ratio of 90 ft2/ft3.

»

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