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 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 116 Wm²K and 14.5 W/m2K respectively, calculate the resistance(R) for the inner fluid thermal layer in K/W to 4 decimal places. A

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 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 116 Wm²K and 14.5 W/m2K respectively, calculate the resistance(R) for the inner fluid thermal layer in K/W to 4 decimal places. A

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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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.
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.
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 Aluminium near the outer thermal layer in K/W to 8 decimal places this question is from thermodynamics
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 Aluminium near the inner thermal layer in K/W to 8 decimal places.
2- 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, 2.5 cm long and 0.25 cm thick. There are to be 100 fins per meter. The convective heat transfer coefficient, both for the wall and the fins, is estimated at 35 W/(m2 K). With this information, determine the percent increase in the rate of heat transfer of the finned wall compared to the bare wall. (take the case where the tip is exposed to convection) Ans(48 t= 2.5 mm 2.5 cm
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…
Calculate the heat loss through a 100-ft² wall with an inside temperature of 65°F and an outside temperature of 35°F. Assume the exterior wall is composed of 2- in. of material having a 'k' factor of 0.80, and 2-in. of insulation having a conductance of 0.16. RTotal = 8.75 & Q = 342-Btu/hr RTotal = 9.2 & Q = 399-Btu/hr RTotal = 8.75 & Q = 399-Btu/hr RTotal = 9.2 & Q = 342-Btu/hr Hide hint for Question 3 Utilize the (RTotal = 1/C + x1/k1) equation.
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.
1 - A square chip, with side w = 5 mm, operates under isothermal conditions.The chip is positioned on a substrate so that its side and bottom surfaces are thermally insulated, while its top surface is exposed to theflow of a refrigerant at T∞ = 15°C. From reliability considerations, the chip temperature cannot exceed T = 85°C. The refrigerant being air, with a convection heat transfer coefficientcorresponding h = 200 W/(m2K), what is the maximum allowable power for the chip? Since the coolant is a dielectric liquid for which h = 3000 W/(m²K), what is the maximum allowed power?
Hint: You found out where is the maximum temperature.
I JUST NEED HELP WITH THE RED MARKED AREAS, THANKS!