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A basement wall extends 6 ft (1.8 m) below grade and is insulated with R-12.5 (R-2.2). The inside is finished with
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- 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.arrow_forwarda pipe with an outside diameter of 2.5 inches is insulated with 2 inches layer of asbestos ( K= 0.396(btu-in)/(hr-ft-F) followed by a layer of cork 1.5 inches thick ( K= 0.30 (btu-in)/ft (hr-ft-F). if the temperature of the outer surface of the cork and pipe is 90 F and 290 F RESPECTIVELY, calculate the heat loss per 100 ft of insulated pipe in btu/hrarrow_forwardrefrigeration system/thermoarrow_forward
- A small metal building is to be constructed of corrugated steel sheet walls with a total wall overall surface area of about 300 m2. The air conditioner consumes about 1kW of electricity for every 4kW of cooling supplied. Two wall constructions are to be compared on the basis of cooling costs. Assume that electricity costs 10.15 Php/kWh. Determine the electrical energy savings of using 260mm of fiberglass insulation instead of 159 mm of fiberglass insulation in the wall. Assume an overall temperature difference across the wall of 20 ° (Uo (260-mm fiberglass)=0.17W/m2 °C and Uo (159-mm fiberglass)=0.31W/m2 °C)arrow_forwardI JUST NEED HELP WITH THE RED MARKED AREAS, THANKS!arrow_forwardDetermine the rate of heat transfer and the overall heat transfer coefficient for the composite wall shown below assuming the width is 1m. 10cm T1 = 100°C h=6W/m2.K 20cm Ka 1.9 W/m.K 10cm Kb=0.05 W/m.K Kc 0.1 W/m.K 10cm Kd=3 W/m.K 10cm T2 = 35°C h₂ = 10 W/m2.Karrow_forward
- 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.arrow_forwardSuppose a 3 in schedule 80 steel pipe is covered with 1 in of an insulation havingk = 60 mW/moC and the outside of the insulation is exposed to an environmenthaving h = 10 W/m2oC and Tf = 20oC. The temperature of the inside of the pipe is250oC. For unit length of the pipe calculate (a) the overall thermal resistance and(b) the heat loss (in Watts).arrow_forwardA potato slice that is 1⁄4” inch thick is placed on a pan that is 212F. The slice has a thermal conductivity of 0.318 Btu/hr-ft-F, and an area of 4 sq in. What is the rate that it heats up if it is initially at 75F?arrow_forward
- Determine the Area of evaporator in m2 for 59 - Ton water cooled air-conditioning system that uses R22 and overall heat transfer coefficient of 45 watt/m2-K Temperature at the cooling water loop are given as follows: 14.9 °C at the inlet of the AHU 7.5 °C entering the evaporator 0 °C refrigerant temperature at the condenserarrow_forward12. A 3.1 cm long straight rectangular fin has a thickness of 2.7 mm. The thermal conductivity is 52 W/m K. The fin is attached to a wall maintained at 190 °C and is exposed to a convection environment at 40 °C and h- 31 W/m2 K. What is the fin efficiency? Express your answer in percent.arrow_forwardQUESTION 41 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.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning