The composite R-value of a wall is R-16. How many Btu will transfer through one square foot of surface when the indoor air temperature is 70o F and the outdoor air temperature equals 20o Fahrenheit?
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- 8.12 An electric room heater has been designed in the shape of a vertical cylinder 2 m tall and 30 cm in diameter. For safety, the heater surface cannot exceed . If the room air is at , find the power rating of the heater in watts.3.17 A 1.4-kg aluminum household iron has a 500-W heating element. The surface area is . The ambient temperature is 21°C, and the surface heat transfer coefficient is . How long after the iron is plugged in does its temperature reach 104°C?What are the important modes of heat transfer for a person sitting quietly in a room? What if the person is sitting near a roaring fireplace?
- The tip of a soldering iron consists of a 0.6-cm- diameter copper rod, 7.6 cm long. If the tip must be 204C, what are the required minimum temperature of the base and the heat flow, in watts, into the base? Assume that h=22.7W/m2KandTair=21C.A pipe carrying superheated steam in a basement at 10C has a surface temperature of 150C. Heat loss from the pipe occurs by radiation (=0.6) and natural convection (hc=25W/m2K). Determine the percentage of the total heat loss by these two mechanisms.A plane wall 15 cm thick has a thermal conductivity given by the relation k=2.0+0.0005T[W/mK] where T is in kelvin. If one surface of this wall is maintained at 150C and the other at 50C, determine the rate of heat transfer per square meter. Sketch the temperature distribution through the wall.
- An electric windshield defroster is used to remove 0.25-in of ice from a windshield. The properties of the ice are Tsat = 328F, uif = hif = 144 Btu/lbm, and v = 0.01602 ft3/lbm. Determine the electrical energy required per square foot of windshield surface area to melt this ice and remove it as liquid water at 328F. What is the minimum temperature at which the defroster may be operated? Assume that no heat is transferred from the defroster or ice to the surroundings.Calculate the amount of energy heated from -5 C to 110 C a. 0.04m^3 oil b. 0.02m^3 aluminum c. 48 kg of glass (density=2500 kg/m^3) d.27 kg of steelA container used to store ice is made of wood 5.0 m thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2-sec-°C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25°F and the temperature inside the box is 5°F.
- If 8lbs of a substance receives 240BTU 9+of heat constant volume and undergo a temperature change of 150°F.A container used to store ice is made of wood 5.0 cm thick and has an effective area of 12,000 cm2 and thermal conductivity of 0.00027 cal/cm2-sec-°C/cm. How much ice inside the box would be melted each 24-hour day if the outside temperature is 25°C and the temperature inside the box is 5°C.I need very QUICK answers, PLEASE. A solar collector meets the hot water needs of a family for 7 months, excluding 5 months of the winter season. This collector provides hot water at an average temperature of 55°C and an average cold water temperature of 16°C. The family uses an average of 14 tons of hot water per month from the solar collector, and in winter, hot water is provided by an electric heater. Since the unit price of electricity is 0.85 TL/kWh and the efficiency of the electric heater is 91%, calculate the annual electricity and money savings provided by the solar collector to the family. (Specific heat of water at room temperature=4.18kJ/kg*C)