Question: (b) The duct of an air conditioning system has rectangular cross section 30 cm x 45 cm. Air at 18-C is flowing through the

(b) The duct of an air conditioning system has rectangular cross section

(b) The duct of an air conditioning system has rectangular cross section 30 cm x 45 cm. Air at 18-C is flowing through the duct at 8 m/s. Using Dittus-Boelter equation, determine the filloving Equivalent diameter of rectangular duct. (2 marks) (ii) The heat transfer coefficient. (6 marks) (i) Heat leakage from the duct per unit length per unit temperature difference. (2 marks) Data: Thermal conductivity of air = 0.026 W/(m.K). Density = 1.205 kg/m Viscosity - 1.81 x 10 N.s/m? Specific heat = 1005 J/(kg K)

Step by Step Solution

★★★★★

3.48 Rating (165 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

Design Air Hows at 18c 8 mls 30cm Sipeed 45cm g reetingul... 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

Students Have Also Explored These Related Chemical Engineering Questions!

Air enters the duct of an air-conditioning system at 15 psia and 50F at a volume flow rate of 450 ft3/min. The diameter of the duct is 10 in, and heat is transferred to the air in the duct from the...

A cylindrical air duct in an air conditioning system has a length of 5.5 m and a radius of 7.2 10-2 m. A fan forces air ( = 1.8 10-5 Pa s) through the duct, so that the air in a room (volume = 280...

An air conditioning system operates at a total pressure of 1 atm consists of a heating section and humidifier which supplies wet steam (saturated water vapor) at 1 atm. Air enters the heating section...

The wall of a liquid-to-gas heat exchanger has a surface area on the liquid side of 1.8 m2 (0.6m 3m) with a heat transfer coefficient of 255 W/(m2 K). On the other side of the heat exchanger wall...

An engineer is designing a heating system which consists of multiple tubes placed in a duct carrying the air supply for a building. She decides to perform preliminary tests with a single copper tube,...

Calculate the Nusselt number and the convection heat transfer coefficient by three different methods for water at a bulk temperature of 32?C flowing at a velocity of 1.5 m/s through a 2.54-cm-ID duct...

A 30-cm-OD pipe with a surface temperature of 90?C carries steam over a distance of 100 m. The pipe is buried with its center line at a depth of 1 m, the ground surface is ?? 6?C, and the mean...

A counter-flowing heat exchanger conserves energy by heating cold outside fresh air at 10oC with the outgoing combustion gas (air) at 100oC. Assume both flows are 1 kg/s and the temperature...

A cooling coil consists of a bank of aluminum (k = 237 W/m K) finned tubes having the core configuration of figure and an inner diameter of 13.8 mm. The tubes are installed in a plenum whose square...

The addition of aluminum fins has been suggested to increase the rate of heat dissipation from one side of an electronic device 1 m wide and 1 m tall. The fins are to be rectangular in cross section,...

1. How bad is employee motivation and engagement as revealed by the Exhibit? 2. What actions can management take to increase motivation? 3. Should management focus on intrinsic, or extrinsic,...

Question) Differentiate: y = (e x+2 ) 2

What is the purpose of identifying the percentage of internal candidates that fill leadership positions prior to implementing a leadership development program? Question 1 options: 1 ) Doing so allows...

Bryan Segota is the sole stockholder and operator of Thatch, a motivational consulting business. At the end of its accounting period, December 31, 2010, Thatch has assets of $760,000 and liabilities...

The following amounts were taken from the accounting records of Bontancia Services, Inc., as of August 31, 2011. Bontancia Services began its operations on September 1, 2010. Capital stock $ 23,000...

One item is omitted in each of the following summaries of balance sheet and income statement data (in millions) for Google and Verizon Communications as of December 31, 2008 and 2007. Determine the...

A plane wall of a furnace is fabricated from plain carbon steel (k = 60 W/m K, p = 7850 kg/m 3 , c = 430 J/kg K) and is of thickness L = 10 mm. To protect it from the corrosive effects of the...

(a) On January 1, 2012, Fishbone Corporation sold a building that cost $250,000 and that had accumulated depreciation of $100,000 on the date of sale. Fishbone received as consideration a $240,000...

Question 1 (1 point) In her book, Jody Miller explains that there have historically been two approaches to studying women and crime. Scholars who apply the gender-ratio approach: minister

19. The lymphatic system is composed of all of the following except A) lymphatic vessels. B) lymph nodes C) the spleen. D) the vena cavae E) lymph. 20. The lymphocytes are most important in A)...

Flow in a slit with uniform cross flow (Fig. 3B.16). A fluid flows in the positive x-direction through a long flat duct of length L, width W, and thickness B, where L > > W >> B. The duct has porous...

Indicate the development changes of sexual organs, circulation, and other organ systems in the fetus. In the sexual differentiation of the male, which becomes the ductus deferens? A.) Gonad B.)...

No 1: Part a: What kinds of personal financial decisions have you made that involve compound interest? Part b: Explain the channels through which funds flow in the economy. Question No 2: Part a: In...

In the flight delays case study in Section 1.1, the data contains flight delays for two airlines, American and United. a) Compute the proportion of times that each carrier's flights was delayed more...

thanks tutors:- Two proposed computer mouse designs were compared by recording wrist extension in degrees for 24 people who each used both mouse types ("Comparative Study of Two Computer Mouse...