Consider the winter air conditioning system shown in the figure below. Moist air enters the conditioned air space at 75 F (db) and at a rate of 3000 Ibm(a)/hr. The space is maintained at 68 F (db) and 40% RH with a sensible heat ratio of 0.65. The sensible heat transfer Q, to the space is 11000 Btu/hr. Twenty percent of the supply air flow is fresh air at 35 F (db) and 10% RH. The air temperature after the preheat coil is 79 F. The barometric pressure is 14.7 psia. a. Use the psychrometric chart to determine the dry bulb temperature and relative humidity of states 1, 5, 6, and 7. Plot the entire process on the psychrometric chart provided. b. Using Table 2-4 Thermodynamic Properties of Moist Air on page 32 in your textbook to determine the following properties for the fresh air state (a copy of it is attached labeled Table A.4E). i. degree of saturation, ii. dew point temperature [F], and iii. enthalpy [Btu/lbm(a)] Note: For the analysis below use the states found in part (a) (dry bulb temperature and relative humidity), the perfect gas equations, and the water saturation tables for the moist air analysis. Do not solve the problem using the psychrometric chart values (but it may be useful to check your answers.) h = 0.24T + w(1061.2 +0.4447) where: T[F] aflbm(v)/lbm(a)] h[Btu/lbm(a)] c. Determine the humidity ratio of the inlet air entering the air space (lbm(v)/lbm(a)]. d. Determine the amount of moisture loss in the air space [lbm(v)/hr]. e. Determine the preheat coil capacity [tons].
Consider the winter air conditioning system shown in the figure below. Moist air enters the conditioned air space at 75 F (db) and at a rate of 3000 Ibm(a)/hr. The space is maintained at 68 F (db) and 40% RH with a sensible heat ratio of 0.65. The sensible heat transfer Q, to the space is 11000 Btu/hr. Twenty percent of the supply air flow is fresh air at 35 F (db) and 10% RH. The air temperature after the preheat coil is 79 F. The barometric pressure is 14.7 psia. a. Use the psychrometric chart to determine the dry bulb temperature and relative humidity of states 1, 5, 6, and 7. Plot the entire process on the psychrometric chart provided. b. Using Table 2-4 Thermodynamic Properties of Moist Air on page 32 in your textbook to determine the following properties for the fresh air state (a copy of it is attached labeled Table A.4E). i. degree of saturation, ii. dew point temperature [F], and iii. enthalpy [Btu/lbm(a)] Note: For the analysis below use the states found in part (a) (dry bulb temperature and relative humidity), the perfect gas equations, and the water saturation tables for the moist air analysis. Do not solve the problem using the psychrometric chart values (but it may be useful to check your answers.) h = 0.24T + w(1061.2 +0.4447) where: T[F] aflbm(v)/lbm(a)] h[Btu/lbm(a)] c. Determine the humidity ratio of the inlet air entering the air space (lbm(v)/lbm(a)]. d. Determine the amount of moisture loss in the air space [lbm(v)/hr]. e. Determine the preheat coil capacity [tons].
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
![Consider the winter air conditioning system shown in the figure below.
Moist air enters the conditioned air space at 75 F (db) and at a rate of 3000
Ibm(a)/hr. The space is maintained at 68 F (db) and 40% RH with a sensible
heat ratio of 0.65. The sensible heat transfer Q, to the space is 11000 Btu/hr.
Twenty percent of the supply air flow is fresh air at 35 F (db) and 10% RH.
The air temperature after the preheat coil is 79 F. The barometric pressure
is 14.7 psia.
a. Use the psychrometric chart to determine the dry bulb temperature and
relative humidity of states 1, 5, 6, and 7. Plot the entire process on the
psychrometric chart provided.
b. Using Table 2-4 Thermodynamic Properties of Moist Air on page 32 in
your textbook to determine the following properties for the fresh air
state (a copy of it is attached labeled Table A.4E).
i.
degree of saturation,
ii.
dew point temperature [F], and
iii.
enthalpy [Btu/lbm(a)]
Note: For the analysis below use the states found in part (a) (dry bulb
temperature and relative humidity), the perfect gas equations, and the water
saturation tables for the moist air analysis. Do not solve the problem using
the psychrometric chart values (but it may be useful to check your answers.)
h = 0.24T + w(1061.2+0.4447)
where: T[F]
aflbm(v)/lbm(a)]
h[Btu/lbm(a)]
c. Determine the humidity ratio of the inlet air entering the air space
(lbm(v)/lbm(a)].
d. Determine the amount of moisture loss in the air space [lbm(v)/hr].
e. Determine the preheat coil capacity [tons].](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbb966d20-0fef-404a-8cd5-3d73aee59512%2F22e7eac9-3394-43ac-9020-08bd00523424%2Fypq0jt8_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Consider the winter air conditioning system shown in the figure below.
Moist air enters the conditioned air space at 75 F (db) and at a rate of 3000
Ibm(a)/hr. The space is maintained at 68 F (db) and 40% RH with a sensible
heat ratio of 0.65. The sensible heat transfer Q, to the space is 11000 Btu/hr.
Twenty percent of the supply air flow is fresh air at 35 F (db) and 10% RH.
The air temperature after the preheat coil is 79 F. The barometric pressure
is 14.7 psia.
a. Use the psychrometric chart to determine the dry bulb temperature and
relative humidity of states 1, 5, 6, and 7. Plot the entire process on the
psychrometric chart provided.
b. Using Table 2-4 Thermodynamic Properties of Moist Air on page 32 in
your textbook to determine the following properties for the fresh air
state (a copy of it is attached labeled Table A.4E).
i.
degree of saturation,
ii.
dew point temperature [F], and
iii.
enthalpy [Btu/lbm(a)]
Note: For the analysis below use the states found in part (a) (dry bulb
temperature and relative humidity), the perfect gas equations, and the water
saturation tables for the moist air analysis. Do not solve the problem using
the psychrometric chart values (but it may be useful to check your answers.)
h = 0.24T + w(1061.2+0.4447)
where: T[F]
aflbm(v)/lbm(a)]
h[Btu/lbm(a)]
c. Determine the humidity ratio of the inlet air entering the air space
(lbm(v)/lbm(a)].
d. Determine the amount of moisture loss in the air space [lbm(v)/hr].
e. Determine the preheat coil capacity [tons].
Transcribed Image Text:3
Exhaust
Conditioned Air Space
2
Reheat
Coil
Air
Washer
Preheat
Coil
Filter
8
7
О.А.
4
Fan
pump
ASHRAE PSYCHROMETRIC CHART NO. 1
Chart la
NORMAL TEMPERATURE
SEA LEVEL
ER m L G coTONIN EN
Ext O
ENTHALPY ey er
ENTHAL n e
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