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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Textbook Question
Chapter 5, Problem 5.35P
A large beverage cooler resembles a small building and is to be maintained at about 35 F (2 C) and a low relative humidity. The walls and ceiling are well insulated and are finished on the inside with plywood. Assume that the outdoor temperature is generally higher than 35 F (2 C). In what direction will moisture tend to migrate? Where should the vapor retardant be located? Explain what might happen if the retardant is improperly located.
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Required information
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to
return to this part.
An air-conditioning system operates at a total pressure of 1 atm and consists of a
heating section and a humidifier that supplies wet steam (saturated water vapor) at
100°C. Air enters the heating section at 10°C and 70 percent relative humidity at a rate
of 32 m /min, and it leaves the humidifying section at 20°C and 60 percent relative
humidity. Use data from the tables.
Sat. vapor
100°C
Heating
coils
Humidifier
10°C
Air
20°C
70%
60%
ymYmin
P=1 atm
Determine the temperature and relative humidity of air when leaves the heating section.
The temperature is
°C.
The relative humidity is
%.
8. Consider two rooms that are identical except that one is maintained at 25°C and 40 percent
relative humidity while the other is maintained at 20°C and 55 percent relative humidity. Noting
that the amount of moisture is proportional to the vapor pressure, determine which room contains
more moisture. Is this the answer you were expecting? Comment on your results.
9. For problem 8 above, what is the difference in the partial pressures of oxygen in each room?
Recall that air contains about 78% Nitrogen, 21% Oxygen, and 1% trace gases.
Required information
Problem 14.095 - Evaporative Swamp Cooler
NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part.
Air enters an evaporative cooler at 1 atm, 40°C, and 20 percent relative humidity at a rate of 7 m³/min, and it leaves with a
relative humidity of 90 percent. Use data from the psychrometric chart.
1 atm
40°C
20%
Air
Water
Mw
Humidifier
€ £2=90%
Problem 14.095.a - Evaporative Swamp Cooler
Determine the exit temperature of the air.
The exit temperature of the air is
°C.
Chapter 5 Solutions
Heating Ventilating and Air Conditioning: Analysis and Design
Ch. 5 - Determine the thermal conductivity of 4 in. (100...Ch. 5 - Compute the unit conductance C for 512 in. (140...Ch. 5 - Compute the unit thermal resistance and the...Ch. 5 - What is the unit thermal resistance for an inside...Ch. 5 - Compute the thermal resistance per unit length for...Ch. 5 - Assuming that the blocks are not filled, compute...Ch. 5 - The partition of Problem 5-4 has still air on one...Ch. 5 - The pipe of Problem has water flowing inside with...Ch. 5 - Compute the overall thermal resistance of a wall...Ch. 5 - Compute the overall heat-transfer coefficient for...
Ch. 5 - Estimate what fraction of the heat transfer for a...Ch. 5 - Make a table similar to Table 5-4a showing...Ch. 5 - Estimate the unit thermal resistance for a...Ch. 5 - Refer to Problem 5-13, and estimate the unit...Ch. 5 - A ceiling space is formed by a large flat roof and...Ch. 5 - A wall is 20 ft (6.1 m) wide and 8 ft (2.4 m) high...Ch. 5 - Estimate the heat-transfer rate per square foot...Ch. 5 - A wall exactly like the one described in Table...Ch. 5 - Prob. 5.19PCh. 5 - Compute the overall heat-transfer coefficient for...Ch. 5 - Compute the overall heat transfer for a single...Ch. 5 - Determine the overall heattransfer coefficient for...Ch. 5 - A basement is 2020ft(66m) and 7 ft (2.13 m) below...Ch. 5 - Estimate the overall heat-transfer coefficient for...Ch. 5 - Rework Problem 5-23 assuming that the walls are...Ch. 5 - A heated building is built on a concrete slab with...Ch. 5 - A basement wall extends 6 ft (1.8 m) below grade...Ch. 5 - A 2440ft(7.312.2m) building has a full basement...Ch. 5 - The floor of the basement described in Problem...Ch. 5 - Assume that the ground temperature tg is 40 F (10...Ch. 5 - Use the temperatures given in Problem 5-30 and...Ch. 5 - A small office building is constructed with a...Ch. 5 - A 100 ft length of buried, uninsulated steel pipe...Ch. 5 - Estimate the heat loss from 100 m of buried...Ch. 5 - A large beverage cooler resembles a small building...Ch. 5 - Consider the wall section shown in Fig. 5-10. (a)...Ch. 5 - A building has floor plan dimensions of 3060ft....Ch. 5 - Compute the temperature of the metal roof deck of...Ch. 5 - Consider the wall section shown in Fig. -4a,...Ch. 5 - Consider the knee space shown in Fig. 5-11. The...Ch. 5 - Estimate the temperature in an unheated basement...
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- Read carefully. Please solve ellaborately and include the untis in every step, and write your solutions clearly and readable if your solution is in written form, Your work will be appreaciated much. Thank You! Atmospheric air from the inside of an automobile enters the evaporator section of the air conditioner at 1 atm, 27 C and 50 percent relative humidity. The air returns to the automobile at 10 C and 90 percent relative humidity. The passenger compartment has a volume of 2 m3 and 5 air changes per minute are required to maintain the inside of the automobile at the desired comfort level. Sketch the psychrometric diagram for the atmospheric air flowing through the air conditioning process. Determine the dew point and wet bulb temperatures at the inlet to the evaporator section, in 8 C. Answer the required heat transfer rate from the atmospheric air to the evaporator fluid, in kW. Answer the rate of condensation of water vapor in the evaporator section, in kg/min. Answerarrow_forwardAfter reaching saturation, if the room continues to cool to a temperature of 1.2 \deg C, how many grams of water vapor (per kg of air) will have had to condense out of the air to maintain a relative humidity of 100 %? g/Kgarrow_forwardShow the step-by-step process. Do not use shortcut methods. Make it as detailed as it can be. MAKE A DIAGRAM AND ENCODE THE ANSWER.arrow_forward
- ASHRAE standard 62.2 states that the minimum acceptable rate of airflow into and out of a room is 15cfm (cubic feet per minute). If air is supplied at 68°F with a relative humidity of 45%, how many gallons of water (minimum) must be added to a portable room humidifier before you go to sleep if you would like to maintain the room at 65% humidity for 7 hours?arrow_forwardGive me right solution with clear calculationsarrow_forwardRead the question carefully. Don't miss any calculations. The recycled duct air in a centralized air conditioning system takes in air at a rate of 60 m3/min with a dry bulb temperature of 20 oC and 30% relative humidity. The recycled air is mixed adiabatically with fresh outdoor air at a rate of 80 m3/min with a dry bulb temperature of 30 oC and 50% relative humidity. Calculate the volumetric flow rate, dry bulb temperature and relative humidity of the mixed air stream. Use the psychrometric chart to get property data and plot the process on the psychrometric chart.arrow_forward
- During very cold weather at a 5000 ft high (1500 m high) mountain site in Colorado, the interior sur- face of a single-glazed window can reach 40°F (4°C). If the room is at 68°F (20°C), what is the maximum relative humidity that can exist in the room without condensations occurring on the window?arrow_forwardPlease show the clear workarrow_forward15 C db OUTSIDE GLAZING Glass Window 22 C db & % RH =? INSIDE (LIVING ROOM) GLAZING Given the condition above, inside & outside glass surface temperature of 15 C, average living room environment is at 22 C & % RH. determine: a) Is there condensation on the inside surface of the glass window if the relative humidity of air in the room is 50%? Support your answer WHY. b) Is there condensation on the inside surface of the glass window if the relative humidity of air in the room is 70 %? Support your answer WHY. c) what is the least value of Relative Humidity (% RH) to be maintained inside to avoid condensation of water vapor on the surface of the glass window? Support your answer WHY & elaborate.arrow_forward
- A water pipe at 5°C runs above ground between two buildings. The surrounding air is at 35°C. What is the maximum relative humidity the air can have before condensation occurs on the pipe?arrow_forwardThe air entering a continuous flow air conditioning system at 1 atmosphere pressure, 15 ̊C temperature and 80% relative humidity with 50 m3/min flow rate is first heated to 25 ̊C and then humidified by spraying steam. It exits the air conditioning system at 30 ̊C and 40% relative humidity. Using the psychrometric diagram; Calculate a) the amount of heat transferred to the air in the heating section and b) the amount of water vapor added to the airarrow_forwardRequired information Problem 14.108 - Cooling Tower Assessment NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. The cooling water from the condenser of a power plant enters a wet cooling tower at 40°C at a rate of 91 kg/s. The water is cooled to 25°C in the cooling tower by air that enters the tower at 1 atm, 23°C, and 60 percent relative humidity and leaves saturated at 32°C. Neglect the power input to the fan. Use data from the psychrometric chart and tables. Problem 14.108.a - Cooling Tower Assessment Determine the volume flow rate of air into the cooling tower. m³/s. The volume flow rate of air isarrow_forward
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