Heating, Ventilating and Air Conditioning 6th. Edition by Faye C. McQuiston, Jerald D. Parker, Jeffrey D. Spitler | 9780471470151 | 471470155 | Holooly

Heating, Ventilating and Air Conditioning

110 SOLVED PROBLEMS

Question: 10.12

Referring to Example 10-11, a water heater at the end of the longest run has a capacity of 50,000 Btu/hr. Condensate flows into a vented dry return that slopes 1/8 in./ft. Size the steam and condensate line. ...

Verified Answer:

The enthalpy of vaporization for the steam is abou...

Question: 3.10

A space is to be maintained at 75 F and 50 percent relative humidity. Heat losses from the space are 225,000 Btu/hr sensible and 56,250 Btu/hr latent. The latent heat transfer is due to the infiltration of cold, dry air. The outdoor air required is 1000 cfm at 35 F and 80 percent relative humidity. ...

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Figure 3-19 is a schematic for the problem; it con...

Question: 3.6

Moist air at 60 F db and 20 percent relative humidity enters a heater and humidifier at the rate of 1600 cfm. Heating of the air is followed by adiabatic humidification so that it leaves at 115 F db and a relative humidity of 30 percent. Saturated water vapor at 212 F is injected. Determine the ...

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Figure 3-6 is a schematic of the apparatus. Locate...

Question: 3.1

Compute the enthalpy of saturated air at 60 F and standard atmospheric pressure. ...

Verified Answer:

Equation 3-20a will be used to compute enthalpy; h...

Question: 10.3

Suppose the pump of Fig. 10-11 is installed in a system as shown in Fig. 10-12. The pump is operating at 3500 rpm with the 6 in. impeller and delivering 200 gpm. The suction line is standard 4 in. pipe that has an inside diameter of 4.026 in. Compute the NPSHA, and compare it with the NPSHR. The ...

Verified Answer:

From Fig. 10-11 the NPSHR is 10 ft of head. The av...

Question: 10.9

Compute the expansion tank volume for a chilled water system that contains 2000 gal of water. The system is regulated to 10 psig at the tank with an operating temperature of 45 F. It is estimated that the maximum water temperature during extended shutdown would be 100 F and a safety relief valve in ...

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A bladder type would be the best choice; however, ...

Question: 14.6

Estimate the heat, mass, and friction coefficients for a four-row cooling coil that has the geometry of Fig. 14-12 with 12 fins per inch. The face velocity of the air is 600 ft/min and has an entering temperature of 80 F. The air leaves the coil at a temperature of 60 F. The air is at standard ...

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The correlations of Figs. 14-14 and 14-15 will be ...

Question: 3.2

The pressure entering and leaving an adiabatic saturator is 14.696 lbf/in.^2, the entering temperature is 80 F, and the leaving temperature is 64 F. Compute the humidity ratio W1 and the relative humidity φ1. ...

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Because the mixture leaving the device is saturate...

Question: 15.11

The following data are given for a lithium bromide–water system of the type shown in Fig. 15-30: condensing temperature, 100 F; evaporating temperature, 40 F; temperature of strong solution leaving absorber, 100 F; temperature of strong solution entering generator, 180 F; and generator temperature, ...

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Parts (a) and (b) will be solved concurrently. Tab...

Question: 3.5

Moist air at 80 F db and 67 F wb is cooled to 58 F db and 80 percent relative humidity. The volume flow rate is 2000 cfm, and the condensate leaves at 60 F. Find the heat transfer rate. ...

Verified Answer:

Equation 3-30 applies to this process, which is sh...

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