On an uncomfortable summer day, the air is at 87 °F and 80 % relative humidity. A laboratory air conditioner is to deliver 1.0 x 103 ft3/min of air at 55 °F in order to maintain the interior air at an average temperature of 75°F and a relative humidity of 40%. If the vent switch is set to the "closed" position (as it normally would be), inside air would be recirculated throgh the airconditioner as shown in the following diagram.Recirculated room air, 75°F h, = 40%Exhuast75°Fh, = 40%AIR CONDITIONERDelivered airLABREHEATER(tons)C °F75°Fh, = 40%Outside airCOOLERA °Fh, = B %%3DCondensedwater Assume A = 87 °F, B = 80 %, C = 55 °F.The recycle ratio (ft3 recirculated/ft³ exhausted) is 2:1.Calculate the condensation rate and the overall cooling requirement in tons if conditioned air is delivered at the same rate,temperature, and relative humidity as in the first part.What percentage of the cooling load on the air conditioner is saved by recirculating the air?Condensation rate:iIbm/minCooling load:itonsPercentage savings:i

Given data: Temperature of air = 87 0F Relative humidity of air = 80 % Temperature of lab = 75 0F…

Answered: The recycle ratio (ft³ recirculated/ft³…

Introduction to Chemical Engineering Thermodynamics

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ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

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On an uncomfortable summer day, the air is at 87 °F and 80 % relative humidity. A laboratory air conditioner is to deliver 1.0 x 10³ft³/min of air at 55 °F in order to maintain the interior air at an average temperature of 75°F and a relative humidity of 40%.

If the vent switch is set to the "closed" position (as it normally would be), inside air would be recirculated throgh the air
conditioner as shown in the following diagram.
Recirculated room air, 75°F h, = 40%
Exhuast
75°F
h, = 40%
AIR CONDITIONER
Delivered air
LAB
REHEATER
(tons)
C °F
75°F
h, = 40%
Outside air
COOLER
A °F
h, = B %
%3D
Condensed
water

Assume A = 87 °F, B = 80 %, C = 55 °F.
The recycle ratio (ft3 recirculated/ft³ exhausted) is 2:1.
Calculate the condensation rate and the overall cooling requirement in tons if conditioned air is delivered at the same rate,
temperature, and relative humidity as in the first part.
What percentage of the cooling load on the air conditioner is saved by recirculating the air?
Condensation rate:
i
Ibm/min
Cooling load:
i
tons
Percentage savings:
i

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