Carbon tetrachloride (CCI4) used as a solvent to clean Optional carbon absorber, grease and oil from mechanical parts evaporates into a 100 cfm stream of air blown up an exhaust hood. To reduce Air out both environmental pollution and operating expense, a vapor-compression refrigeration unit is emplaced in the Condenser. R-22 exhaust stream as shown in Fig. to condense the CCI4 for Intermediate Remote start switch (optional) B. reuse. The saturation vapor pressure Psat (mm Hg) of CCI4 packing Expansion valve Second stage evaporator/chiller varies with absolute temperature T(K) in the-19 °C to 20 °C interval as (Handbook of Chemistry and Physics, 1953, p. (not on all models only as required) Intermediate packing 2243) 10° F internal temp log10(Psot) = - 0.05223a/T + b First stage evaporator/chiller R-22 Desuperheater Compressor package for remote mounting (external condenser) . Condensate Compressor Air and vapor One way flow valve where a = 33,914 and b = 8.004. When the air is saturated in with CCIA, the partial pressure Pv of the CCla equals the saturation pressure. The relationship between the partial 1 gal catch tank pressure of the vapor and the specific humidity w is Sight glass w = Py/ Paix = ex (My /Mair)Psorai - P) where p is mass density, CCI4 molecular weight My-153.84, and air Valve- molecular weight Moir= 28.97. (a) If the air stream is saturated with CCI4 at 68 °F before the refrigeration unit and at 10 °F after it determine the numerical values of the rates at which CCI4 is condensed and exhausted to the atmosphere (CCla heat of vaporization = 95 Btu/lbm ). Answer: 43 Ibm/hr exhausted. (b) Determine the required refrigerating capacity and the power that the compressor and blower motors would consume. · Answer: q0001 = 2 X 104 Btu/hr, wmotors = 3 kW. (C) Comment on the possibility of frost forming on the evaporator coil from water vapor.
Carbon tetrachloride (CCI4) used as a solvent to clean Optional carbon absorber, grease and oil from mechanical parts evaporates into a 100 cfm stream of air blown up an exhaust hood. To reduce Air out both environmental pollution and operating expense, a vapor-compression refrigeration unit is emplaced in the Condenser. R-22 exhaust stream as shown in Fig. to condense the CCI4 for Intermediate Remote start switch (optional) B. reuse. The saturation vapor pressure Psat (mm Hg) of CCI4 packing Expansion valve Second stage evaporator/chiller varies with absolute temperature T(K) in the-19 °C to 20 °C interval as (Handbook of Chemistry and Physics, 1953, p. (not on all models only as required) Intermediate packing 2243) 10° F internal temp log10(Psot) = - 0.05223a/T + b First stage evaporator/chiller R-22 Desuperheater Compressor package for remote mounting (external condenser) . Condensate Compressor Air and vapor One way flow valve where a = 33,914 and b = 8.004. When the air is saturated in with CCIA, the partial pressure Pv of the CCla equals the saturation pressure. The relationship between the partial 1 gal catch tank pressure of the vapor and the specific humidity w is Sight glass w = Py/ Paix = ex (My /Mair)Psorai - P) where p is mass density, CCI4 molecular weight My-153.84, and air Valve- molecular weight Moir= 28.97. (a) If the air stream is saturated with CCI4 at 68 °F before the refrigeration unit and at 10 °F after it determine the numerical values of the rates at which CCI4 is condensed and exhausted to the atmosphere (CCla heat of vaporization = 95 Btu/lbm ). Answer: 43 Ibm/hr exhausted. (b) Determine the required refrigerating capacity and the power that the compressor and blower motors would consume. · Answer: q0001 = 2 X 104 Btu/hr, wmotors = 3 kW. (C) Comment on the possibility of frost forming on the evaporator coil from water vapor.
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Transcribed Image Text:Carbon tetrachloride (CCI4) used as a solvent to clean
Optional
carbon absorber,
grease and oil from mechanical parts evaporates into a 100
cfm stream of air blown up an exhaust hood. To reduce
Air out
both environmental pollution and operating expense, a
vapor-compression refrigeration unit is emplaced in the
Condenser.
R-22
exhaust stream as shown in Fig. to condense the CCI4 for
Intermediate
Remote
start
switch
(optional)
B.
reuse. The saturation vapor pressure Psat (mm Hg) of CCI4
packing
Expansion
valve
varies with absolute temperature T(K) in the -19 °C to 20 °C
Second stage
interval as (Handbook of Chemistry and Physics, 1953, p.
evaporator/chiller
(not on all models
only as required)
2243)
Intermediate
packing
10° F internal temp
log10(Psat) = - 0.05223a/T + b
First stage
evaporator/chiller
R-22
Desuperheater
Compressor package
for remote mounting
(external condenser)
Condensate
Compressor
Air and vapor
in
One way
flow valve
where a = 33,914 and b = 8.004. When the air is saturated
with CCla, the partial pressure Py of the CCla equals the
saturation pressure. The relationship between the partial
pressure of the vapor and the specific humidity w is
Sight
glass
1 gal
catch
tank
w = Py/ Paix = ex (My /Mair)Psorai - P) where p is mass
density, CCI4 molecular weight My-153.84, and air
Valve-
molecular weight Moir= 28.97.
(a) If the air stream is saturated with CCI4 at 68 °F before the refrigeration unit and at 10 °F after it determine the numerical values of the rates at which CCI4
is condensed and exhausted to the atmosphere (CCla heat of vaporization = 95 Btu/lbm ). Answer: 43 Ibm/hr exhausted.
(b) Determine the required refrigerating capacity and the power that the compressor and blower motors would consume. · Answer: q0001 = 2 X 104 Btu/hr,
wmotors = 3 kW.
(c) Comment on the possibility of frost forming on the evaporator coil from water vapor.
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