*"24.27 In the vapor-recompression evaporator shown in Figure P24.27, the vapor produced on evaporation is compressed to a higher pressure and passed through the heating coil to provide the energy for evaporation. The steam entering the compressor is 98% vapor and 2% liquid, at 10 psia; the steam leaving the compressor is at 50 psia and 400°F; and 6 Btu of heat are lost from the compressor per pound of steam throughput The condensate leaving the heating coil is at 50 psia, 200°F (a) Compute: The Btu of heat supplied for evaporation in the heating coil per Btu of work needed for compression by the compressor. (b) If 1,000,000 Btu per hour of heat is to be transferred in the evaporator, what must be the intake capacity of the compressor in ft3 of wet vapor per minute? Compressor O00040 Heating Coil Figure P24.27 Condensate

Question
*"24.27 In the vapor-recompression evaporator shown in Figure P24.27, the vapor produced
on evaporation is compressed to a higher pressure and passed through the heating coil
to provide the energy for evaporation. The steam entering the compressor is 98%
vapor and 2% liquid, at 10 psia; the steam leaving the compressor is at 50 psia and
400°F; and 6 Btu of heat are lost from the compressor per pound of steam throughput
The condensate leaving the heating coil is at 50 psia, 200°F
(a) Compute: The Btu of heat supplied for evaporation in the heating coil per Btu of
work needed for compression by the compressor.
(b) If 1,000,000 Btu per hour of heat is to be transferred in the evaporator, what must
be the intake capacity of the compressor in ft3 of wet vapor per minute?
Compressor
O00040
Heating Coil
Figure P24.27
Condensate

Image Transcription

*"24.27 In the vapor-recompression evaporator shown in Figure P24.27, the vapor produced on evaporation is compressed to a higher pressure and passed through the heating coil to provide the energy for evaporation. The steam entering the compressor is 98% vapor and 2% liquid, at 10 psia; the steam leaving the compressor is at 50 psia and 400°F; and 6 Btu of heat are lost from the compressor per pound of steam throughput The condensate leaving the heating coil is at 50 psia, 200°F (a) Compute: The Btu of heat supplied for evaporation in the heating coil per Btu of work needed for compression by the compressor. (b) If 1,000,000 Btu per hour of heat is to be transferred in the evaporator, what must be the intake capacity of the compressor in ft3 of wet vapor per minute? Compressor O00040 Heating Coil Figure P24.27 Condensate

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