Problem 1: A rectangular (70mm Wide x 60mm Tall x 180mm long) air heater is used to heat 0.04m³ incoming air (Q = from 25°C to 60°C. To increase the surface area, the cross-section is split into 6 rectangular channels using aluminum fins, as shown below. The fins are evenly spaced and 2mm thick. What must the average surface temperature of the fins be to sufficiently heat the air?

Problem 1: A rectangular (70mm Wide x 60mm Tall x 180mm long) air heater is used to heat 0.04m³ incoming air (Q = from 25°C to 60°C. To increase the surface area, the cross-section is split into 6 rectangular channels using aluminum fins, as shown below. The fins are evenly spaced and 2mm thick. What must the average surface temperature of the fins be to sufficiently heat the air?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Problem 3: During summer, the temperature in Dhahran averages at 38°C for the entire day and night period. To maintain the inside of a building at the comfort level of 20°C, an Engineer suggested to use a commercial air conditioning (AC) system. The insulation and thermal design of the building is such that 28000 kJ/h of heat transfers to Inside 28000 Outside 20°C kJ/h 38°C Refrigerant loop Evaporator Condenser Compressor the building from outside. This amount of heat needs to be removed by the AC. The cost of electricity is 0.21 Ryial/kWh. Hint: 1 kWh-360OJ a. The suggested air conditioner requires a net power input to the compressor of 2 kW. Is the Engineer's suggestion valid? Calculate the coefficient of performance and the cost of electricity for one summer month. b. What is the minimum theoretical cost to operate the air conditioner? Discuss your results.
QUESTION 58 A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10-mm-thick layers of Aluminium (k 225 W/mK) separated by a 30 mm polyurethane insulation (k=0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces 11.6 W/m2K and 14.5 W/m2K are respectively, calculate: the outer surface temperature of the Aluminum in °C to 2 decimal places.
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QUESTION 1 A domestic refrigerator with Inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to malntaln a set temperature of 6 "C. The bodies consist of two 10-mm-thick layers of Aluminium (k - 225 WmK) separated by a 30 mm polyurethane Insulation (k-0.028 WimK). If the average convection heat transter coefficient at the Inner and outer surfaces are 11.6 W/m2k and 14.5 W/m2K respectively, calculate: the resistance(R) for the Aluminium near the inner thermal layer in K/W to 8 decimal places. QUESTION 2 A domestic refrigerator with Inner dimensions of 0.7 m by 0.7 m at the base and helght 1 m was designed to malntaln a set temperature of 6 "C. The bodies consist of two 10-mm-thick layers of Aluminium (k - 225 W/mK) separated by a 30 mm polyurethane Insulation (k-0.028 WimK). If the average convection heat transfer coefficlent at the Inner and outer surfaces are 11.6 W/m2K and 14.5 W/mK respectively, calculate: the resistance(R) for the Aluminium near the outer…
QUESTION 15 A domestic refrigerator with inner dimensions of 0.7 m by 0.7 m at the base and height 1 m was designed to maintain a set temperature of 6 °C. The bodies consist of two 10-mm-thick layers of Aluminium (k = 225 W/mK) separated by a 30 mm polyurethane insulation (k=0.028 W/mK). If the average convection heat transfer coefficient at the inner and outer surfaces are 11.6 W/m²K and 14.5 W/m2K respectively, calculate: the resistance(R) for the outer fluid thermal layer in K/W to 5 decimal places.
L.1What are the best possible solutions to increase the heat transfer rate of a body.Which material will transfer more heat? Either a material with thermal conductivity ? = 121 or ? = 22 . Justify your answer. Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate? Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer.Flat plate.Circular/pin fins.Triangular fins.
PROCESS INSTRUMENTATION AND CONTROL 4. A 3m X 2m window has an exterior surface temperature of 220C, and the outside wind is blowing air at -60C across it with a convection heat transfer of h= 125W/m2K. What is the total heat transfer loss?
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Problem 1 A hot water pipe is used for domestic applications is insulated with a layer of calcium silicate. If the insulation is 25 mm thick and its inner and outer surfaces are maintained at Ts,1 = 800 K and Ts,2 = 400 K, respectively. The outside diameter is 0.12 m. Given the thermal conductivity calcium silicate insulation equals to 0.09 W/m.K. A. Define the difference between lagged and unlagged pipes. B. Calculate the heat loss per unit length for this pipe.