Heating Ventilating and Air Conditioning: Analysis and Design
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 3.43P

A variable-air-volume VAV cooling system is a type where the quantity of air supplied and the supply air temperature are controlled. The space is to be maintained at 75 F (24 C) db and 63 F (17 C) wb. Under design conditions, the total cooling load is 15.0 tons (53.0 kW) with a sensible heat factor of 0.6, and the supply air temperature is 60 F (16 C) db. At minimum load, about 1.8 tons (6.3 kW) with SHF of 0.8, the air quantity may be reduced no more than 80 percent by volume of the full load design value. Determine the supply air conditions for minimum load. Show all the conditions on a psychrometric chart for (a) English units and (b) SI units. Assume sea-level pressure.

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b.) A variable-air-volume cooling system delivers air to a controlled space maintained at 24 C db and 17 C wb. Under design conditions, the total cooling load is 60 kW with a sensible heat factor of 0.60, and the supply air temperature is 16 C db. At minimum load, about 7.5 kW with SHF of 0.80, the air quantity may be reduced no more than 75% by volume of the full load design value. Determine the supply air conditions for minimum load (state dry bulb temperature and wet bulb temperature, both in degree C).
The following data refer to summer air conditioning of a building: Outside design conditions 43 °C DBT, 27 °C WBT Inside design condition 25 °C DBT, 50% RH Room sensible heat gain 84000 kJ/h Room latent heat gain 21000 kJ/h BPF of cooling coil 0.2 The return air from the room is mixed with the outside air before entry to cooling coil in the ratio of 4:1 by mass. Determine: (a) Apparatus dew point of the cooling coil (b) Entry and exit conditions of air for cooling coil (c) Fresh air mass flow rate and (d) Refrigeration load on the cooling coil.
1. A variable-air-volume cooling system delivers air to a controlled space maintained at 24 C db and 17 C wb. Under design conditions, the total cooling load is 60 kW with a sensible heat factor of 0.60, and the supply air temperature is 16 C db. At minimum load, about 7.5 kW with SHF of 0.80, the air quantity may be reduced no more than 75% by volume of the full load design value. Calculate the minimum volume of air to be supplied to the space at minimum load, cu.m/min.

Chapter 3 Solutions

Heating Ventilating and Air Conditioning: Analysis and Design

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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