Heating Ventilating and Air Conditioning: Analysis and Design
6th Edition
ISBN: 9780471470151
Author: Faye C. McQuiston, Jeffrey D. Spitler, Jerald D. Parker
Publisher: Wiley, John & Sons, Incorporated
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Chapter 3, Problem 3.39P
An evaporative cooling system is to be used to condition a large warehouse located in Denver, Colo.,
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A space is to be maintained at 22C and 50% relative humidity. The sensible heat load is 100 kW, and the latent heat load is 15 kW. Outside air is at 38C DB and 25C WB temp. Air is supplied to the space at 13C. If all-outside air system (no recirculation) is to be implemented, determine: (a) the cooling capacity in tons; (b) capacity of supply air fan in cmh; and (c) the coil bypass factor.
9. A large warehouse located at an altitude of 1500 m has to be maintained at a
DBT of 270C and a relative humidity of 50% using a direct evaporative cooling
system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling
load on the warehouse is 352 kW. A supply fan located in the downstream of the
evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air.
Assume the process in evaporative cooler to follow a constant WBT.
10. A winter air conditioning system maintains a building at 210C and 40% RH.
The outdoor conditions are OoC (DBT) and 100% RH. The sensible load load on
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conditioning system, 50% of the outdoor air (by mass) is mixed with 50% of the
room air. The mixed air is heated in a pre-heater to 250C and then required
amount of dry saturated steam at 1 atm. pressure is added to the pre-heated air
in a humidifier. The humidified air is then heated to supply temperature of…
A space to be conditioned has a sensible heat load of 80 kw and a latent heat load of 20 kw and is to be
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refrigeration capacity of the system is nearest to what value?
430 kw
455 kw
428 kw
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Chapter 3 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 3 - A space is at a temperature of 75 F (24 C), and...Ch. 3 - Determine the humidity ratio, enthalpy, and...Ch. 3 - Suppose the air of Problem 3-2 is at a pressure...Ch. 3 - What is the enthalpy of moist air at 70 F (20 C)...Ch. 3 - The inside surface temperature of a window in a...Ch. 3 - What is the mass flow rate of dry air flowing at a...Ch. 3 - Determine the dew point of moist air at 80 F (27...Ch. 3 - A room is to be maintained at 72 F (22 C) db. It...Ch. 3 - Air is cooled from 80 F db and 67 F wb until it is...Ch. 3 - Conditions in a room are measured to be 80 F db...
Ch. 3 - The environmental conditions in a room are to be...Ch. 3 - Air enters a cooling coil at the rate of 5000 cfm...Ch. 3 - Air flowing in a duct has dry and wet bulb...Ch. 3 - Air is humidified with the dry bulb temperature...Ch. 3 - Air at 38 C db and 20 C wb is humidified...Ch. 3 - Two thousand cfm (1.0 m3/s) of air at an initial...Ch. 3 - Air at 40 F (5 C) db and 35 F (2 C) wb is mixed...Ch. 3 - Rework Problem 3-25, using Chart 1a, with the...Ch. 3 - The design cooling load for a zone in a building...Ch. 3 - Assume that the air in Problem 3-22 is supplied to...Ch. 3 - The sensible heat loss from a space is 500,000...Ch. 3 - Air enters a refrigeration coil at 90 Fdb and 75...Ch. 3 - A building has a total heating load of 200,000...Ch. 3 - Reconsider Problem 3-36 for an elevation of 5000...Ch. 3 - The system of Problem 3-34 has a supply air fan...Ch. 3 - An evaporative cooling system is to be used to...Ch. 3 - A cooling system is being designed for use at high...Ch. 3 - Consider a space heating system designed as shown...Ch. 3 - A variable-air-volume VAV cooling system is a type...Ch. 3 - Rework Problem 3-43 for an elevation of 5000 feet...Ch. 3 - The design condition for a space is 77 F (25 C) db...Ch. 3 - Rework Problem 3-45 for an elevation of 5000 feet...Ch. 3 - It is necessary to cool and dehumidify air from 80...Ch. 3 - Conditions in one zone of a dual-duct conditioning...Ch. 3 - Rework Problem 3-48 for an elevation of 5000 ft...Ch. 3 - A water coil in Problem 3-48 cools return air to...Ch. 3 - A multizone air handler provides air to several...Ch. 3 - Under normal operating conditions a zone has a...Ch. 3 - An interior zone of a large building is designed...Ch. 3 - Outdoor air is mixed with room return air to...Ch. 3 - Consider an enclosed swimming pool. The pool area...Ch. 3 - One particular zone served by a multizone air...Ch. 3 - A research building requires 100 percent outdoor...Ch. 3 - A space requires cooling in the amount of 120,000...
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- The cooling load calculations on a theatre show that at design conditions the sensible heat load is 200 kw and the latent heat load is 70 kw. The indoor design conditions are 26°C dry bulb and50% relative humidity. Air is to be supplied to the theatre at 16°C while the outside airis at 30°C dry bulb and 60% relative humidity. Take ventilating air as 25% of the supply air. Calculate the tons of refrigeration required by the conditioner.arrow_forwardHw. No. 6 9. A large warehouse located at an altitude of 1500 m has to be maintained at a DBT of 270C and a relative humidity of 50% using a direct evaporative cooling system. The outdoor conditions are 330C (DBT) and 150C (WBT). The cooling load on the warehouse is 352 kW. A supply fan located in the downstream of the evaporative cooler adds 15 kW of heat. Find the required mass flow rate of air. Assume the process in evaporative cooler to follow a constant WBT.arrow_forwardplease solve in 5o mins i will give you positive feedback. i need handwritten solution on pagesarrow_forward
- QUESTION 1 Water at 60°C leaving a condenser at the rate of 22.5kg/s is sprayed into a natural-draught cooling tower and leaves it at 27°C. Air enters the tower at 1.013bar, 13°C and 50% relative humidity and leaves it at 38°C, saturated. Take Cp for the superheated vapour as 1.86 kJ/kgK. Calculate: 1.1. the air flow rate required in m/s; 1.2. the make-up water required in kg/s.arrow_forwardThe design condition for a space is 77oF db and 50% relative humidity with 55oF db supply air at 90% relative humidity. A 50-ton, constant-volume space air- conditioning system uses face and bypass and water temperature control. Outdoor air is supplied at 95oF db, 60% relative humidity with a ratio of 1 lbm to 5 lbm re-circulated air. A part-load condition exists where the total space load is decreased by 50% and the SHF is increased to 90%. The outdoor air condition changes to 85oF db and 70% relative humidity. Assume sea-level conditions. a) At full – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at fullload conditions.c. Determine the apparatus dew point temperature at full load conditions. b)At part – load conditions:a. Show all the processes on a psychrometric chart.b. Determine the temperature must the air be supplied to the space at partload conditions.c. Determine the apparatus dew point…arrow_forwardI need the answer as soon as possiblearrow_forward
- QI: An air conditioning system is used to keep indoor condition of 24°C and 50% relative humidity inside a space as shown in Figure 1. An amount of 75% of returned air is mixed with 25% fresh ambient air at 40°C and 40% relative humidity before entering to the air filter. The air is cooled though the air cooling coil of surface effective temperature (apparatus dew point temperature) equals to 10°C and bypass factor is 0.2. Find the following: a. State of air after mixing (point m). b. State of air at coil outlet (point c). c. Sketch the process on the psychometric chart. d. Sensible heat factor of the space. space exhaust (25%) cooling coil filter fan m fresh air (25%) Figure 1arrow_forwardUsing a psychrometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 30 ° C and RH 35%. The air is heated to DBT 80 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. For this process, calculate: a. Change in absolute humidity of air from initial to final conditions = ... (kg water / kg air) b. The change in enthalpy of air from initial to final conditions = ... (KJ / Kg of air)arrow_forwardUsing a psychometric diagram, describe the heating and humidification process from the following data. Initially the air was at dry bulb temperature (DBT) 35 ° C and RH 35%. air preheated to DBT 85 ° C. The heated air is then flowed through a humidifier to increase the RH to 25%. for this process, count, a. change in absolute humidity of air from initial to final conditions = ..... (kg water / kg air) b. change in air enthalpy from initial to final conditions = ..... (kj / kg air)arrow_forward
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