Question: Cooled air is flowing through a long sheet metal air conditioning duct, 0.2 m high and 0.3 m wide. If the duct temperature is 10?C

Cooled air is flowing through a long sheet metal air conditioning duct, 0.2 m high and 0.3 m wide. If the duct temperature is 10?C and passes through a crawl space under a house at 30?C, estimate(a) The heat transfer rate to the cooled air per meter length of duct.(b) The additional air conditioning load if the duct is 20 m long.(c) Discuss qualitatively the energy conservation if the duct were insulated with glass wool.GIVENAn air conditioning duct in a crawl spaceDuct height (H) = 0.2 mDuct width (w) = 0.3 mDuct temperature (Ts) = 10?CAmbient temperature (T??) = 30?CASSUMPTIONSAmbient air is stillDuct temperature is constant and uniformRadiation is negligibleEdge effects are negligibleNo condensation on the ductsurface

Alr T- 30C w-0.3 m T.= 10 C H=0.2 m Uninsulated Insulated

Step by Step Solution

★★★★★

3.37 Rating (172 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a The duct can be thought of as two vertical and two horizontal cooled flat plates For the sides So ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

66-E-M-E-H-M-T (1698).docx

120 KBs Word File

Students Have Also Explored These Related Mechanical Engineering Questions!

During the war in Afghanistan, the Terraco Motor Company produced a lightweight, all-terrain vehicle code-named "J99 Terra" for the military. The company is now planning to sell the Terra to the...

Air is flowing through a smooth thin-walled 4-indiameter copper tube that is submerged in water. The water maintains a constant temperature of 60°F and a convection heat transfer coefficient of...

A current of 1000 A is flowing through a long copper conductor (K-390 W/m.K), 25 mm in diameter, that has on electric resistivity of 1.08 cm. This rod is insulate to a radius of 17.5 mm with fibrous...

A liquid is flowing through a horizontal pipe whose radius is 0.0200 m. The pipe bends straight upward through a height of 10.0 m and joins another horizontal pipe whose radius is 0.0400 m. What...

#6 and #7 1. Moist air at standard conditions is at a dry bulb temperature of 50F and a relative humidity of 70%. It is sensibly heated (constant moisture) to 72F. Use the psychrometric chart to...

QUESTION 1: a) Water (k = 0.608W/mK) is flowing through a tube with an inner diameter of 15mm. Given that the Nusselt is 70, determine the heat transfer coefficient = b) A liquid with Prandit number...

b) A liquid with Prandit number 10 is heated while flowing through a tube in fully developed flow. Given that the Reynolds number is 1.2 x 105, calculate the Nusselt number c) Air is flowing in a...

A residence located in Montreal includes a bedroom whose exposed wall measures 2.4 m high and 3.2 m long. (the other walls are interior) In the wall there is a window measuring 1.6 m x 1.2 m. The...

The component of a GMAW welding outfit which controls the speed the filler wire is introduced to the weld is called a . The power supply b . The wire feeder c . The torch d . The work lead What gas...

Please help me with the Outlet Temperature and Heat Transferred part A stream of air at 550.0C and 835 torr with a dew point of 30.0C flowing at a rate of 1915L/s is to be cooled in a spray cooler. A...

Q 1 a: Mark \ ( [ \ sqrt { } ] \ ) or \ ( [ \ mathrm { X } ] \ ) as appropriate against each of the following: 1 . The Heat treatment is the controlled heating and cooling of metals to alter their...

Have you ever imagined having one electronic device that does everything you would ever need? Mobile phone makers in Japan have gone beyond the imagining phase. Cell phones in Japan are becoming more...

Trevor Mills produces agricultural feed at its only plant. Materials are added at the beginning of the process. Information on work-in-process in December follows: Beginning inventory, 40,000...

Question - Considering the details on company listings, which of the following is NOT a valid reason for a company to delist from a stock exchange? ( 1 ) The company's owners wish to pursue other...

For the Exponentially Distributed random variable X with probability density function (pdf) as tollows: fx(x) = dea x>0 otherwise Homework 1: Show thue derivation of tlu: following: 1 v E(X) Hx - B...

4) Exp lain P. F. E. L e) hori ng Zoam Group Chat Frem Mital Apaydin t eo repented the n complex roods From AEKINIte ey ralve this exomple: Fm MUEATOYUNC tn yone FIS) = Finm Mehmat AGUINDOSANt...

1. How would you describe J&Js organizational structure? 2. How does J&J balance globalization with a local focus when needed? 3. How can a company like J&J promote consistent ethical...

How would you describe your company's competitive situation prior to the acquisition? Carl, the president of the company acquired by RPZ marketing, has agreed to be interviewed by the business...

A proposed design for a hydroelectric project is based on a discharge of 0.25 m 3 /s through the penstock and turbine (Fig. P12.50). The friction factor can be assumed constant, f = 0.015, and the...

Retrieve inflation data from The World Bank data base (http://databank.worldbank.org/data/home.aspx) for India, Spain, and South Africa for 20112015. Prepare a chart that compares India, Spain, and...

On a cold winter day, the outside wall of a home is exposed to an air temperature of 2C when the inside temperature of the room is at 22C. As a result of this temperature gradient, there is heat...

Wearing layers of clothing in cold weather is often recommended because dead-air spaces between the layers keep the body warm. The explanation for this is that the heat loss from the body is less....

A long wire 0.7 mm in diameter with an emissivity of 0.9 is placed in a large quiescent air space at 270 K. If the wire is at 800 K, calculate the net rate of heat loss. Discuss your assumptions.

Halliford Corporation expects to have earnings this coming year of $3 179 por share Halliford plans to retain all of its carnings for the next two years. Then, for the subsequent two years, the firm...

This Question: 4 pts 2 of 28 (24 complete) When conducting research on color blindness in males, a researcher X P(x) forms random groups with five males in each group. The random variable 0 0.653 x...

10. The table below shows the lengths of ski poles sold by a sporting goods store last December. Create a frequency polygon to display this information. Length (cm) Frequency 125-129 6 130-134 18...