A coke packed humidifier is to be designed to cool 3,000 cfm of saturated air from 150 to 75 °F at barometric pressure. Cooling water at 50°F will be allowed to heat up to 100°F. Gas velocity will be 3,000 lb of dry air per sq ft of total cross section. Water velocity is 1,200 lb/h per sq ft of total cross section. Over-all coefficient of sensible heat transfer from air to water = 300 BTU/h ft³ °F. Calculate the height and diameter of cooling tower required. Round your answers to the nearest 0.05 ft.

A coke packed humidifier is to be designed to cool 3,000 cfm of saturated air from 150 to 75 °F at barometric pressure. Cooling water at 50°F will be allowed to heat up to 100°F. Gas velocity will be 3,000 lb of dry air per sq ft of total cross section. Water velocity is 1,200 lb/h per sq ft of total cross section. Over-all coefficient of sensible heat transfer from air to water = 300 BTU/h ft³ °F. Calculate the height and diameter of cooling tower required. Round your answers to the nearest 0.05 ft.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.3P

See similar textbooks

Similar questions

In the summer, when the air motion is increased body heat loss is also increased. True or false ?
2.5 m3/s of humid air at a state of 28°C DB, 21°C WB and 101.325 kPaa flow across a cooler coil and leaves ar 12.5°C DB and 0.0083 kg vapor per kg dry air. If the apparatus dew point temperature (ADP) is 8.5, compute for the contact factor
It is common knowledge that the temperature of air rises as it is compressed. An inventor thought about using this high-temperature air to heat buildings. He used a compressor driven by an electric motor. The inventor claims that the compressed hot-air system is 25 percent more efficient than a resistance heating system that provides an equivalent amount of heating. Is this claim valid, or is this just another perpetualmotion machine? Explain.
Consider that a flow of air with a velocity of 270 m/s enters an adiabatic diffuser at a pressure of 60 kPa and a temperature of 7°C and exits the diffuser at a pressure of 85 kPa and a temperature of 27°C. Use variable specific heat approach to indicate the air properties. Calculate the ratio of the inlet area to the exit area of the nozzle.
The effective surface temperature of the coil is 5°C. The surface area of the coil is such as would give 4.6 TR with the given entering air state of 40 m¾/min of a mixture of re- circulated room air and outdoor air enters cooling coil at 27°C dry bulb temperature and 15°C wet bulb temperature.. Determine the conditions of the air leaving the coil and the by-pass factor.
Transient Cooling For either a flat plate or flow through a duct, how was the convective heat transfer determined? please explain?
A stationary temperature probe inserted into a duct where air is flowing at 190 m/s reads 85°C. What is the actual temperature of the air?
The effective surface temperature of the coil is 5°C. The surface area of the coil is such as would give 4.6 TR with the given entering air state of 40 m3/min of a mixture of recirculated room air and outdoor air enters cooling coil at 27°C dry bulb temperature and 15°C wet bulb temperature.. Determine the conditions of the air leaving the coil and the by-pass factor.
Determine the airflow through a furnace that is producing 60,000 btu/h of heat when the return air temperature is 72 degrees and the supply air temperature is 130 degrees
Ethylene glycol at 40°C flows over a heated plate very wide, 6 m long, at velocity of 0.04 m/s. For a temperature = 90°C, determine: 1- the thickness of the hydrodynamic boundary layer at the end of the plate2- the thickness of the thermal boundary layer at the end of the plate3- the local and average heat transfer coefficient at the end of the plate4- the total heat flux transferred from the heated surface.
A desktop computer is to be cooled by a fan. The electronic components of the computer consume 80 W of power under full-load conditions. The computer is to operate in environments at temperatures up to 50°C and at elevations up to 3000 m where the atmospheric pressure is 70.12 kPa. The exit temperature of air is not to exceed 60°C to meet the reliability requirements. Also, the average velocity of air is not to exceed 120 m/min at the exit of the computer case, where the fan is installed to keep the noise level down. Specify the flow rate of the fan that needs to be installed and the diameter of the casing of the fan.
Air with dby bulb temperature of 25C PSAT = 3.169kpa and wet bulb temperature of 15C PSAT=1.7051 kpa flows in round duct of diameter 800m with velocity of 7m/S Determine Mass flow rate (answer. 249kg/min) Mass flow rate of dry air (answer 247 kg/min)