nit of thermal conductivity in S.I. units is (A) J/m² sec
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Unit of thermal conductivity in S.I. units is
(A) J/m² sec
(B) J/m °K sec
(C) W/m °K
(D) Option B and C above.
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- 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?Air at 27 Celsius degree receives heat at a constant volume until its temperature reaches 927 Celsuis degree. determine the heat added per kelogram?A steel cube is to be heated from 120°C to an average temperature of 180°C in 45 minutes. One side of the cube is 50 cm in length. Taking the average density and specific heat of steel in this temperature range to be ρ = 7,950 kg/m 3 and c p = 0.49 kJ/kg·°C, respectively, determine a) the total amount of heat transfer to the steel cube, b) the average rate of heat transfer to the cube, C) the average heat flux.
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- In determining the average rate of heating of a tank of 20% sugar syrup, thetemperature at the beginning was 20°C and it took 30 min to heat to 80°C. Thevolume of the sugar syrup was 50 ft3 and its density 66.9 lb/ft3. The specific heat ofthe sugar syrup is 0.9 Btu lb-1°F-1.(a) Convert the specific heat to kJ kg-1°C-1.(b) Determine the rate of heating, that is the heat energy transferred in unit time, in SI units (kJ s-1)The rate of heat transferred between air and condensing refrigerant in a condenser is 70 kW. The condenser has an air-side area of 210 m2 and a U value based on this area of 0.037 kW/m2 -oC. It is supplied with 6.6 m3/s of air which has a density of 1.15 kgm/m3. If the condensing temperature is 55 oC, Determine the temperature of inlet air. (for decimal places for final answer)An office heater puts out 2090 Btu (British thermal units) of energy in the form of heat per hour. Given that 1 Btu=1.055 kJ,how many megajoules of energy in the form of heat can be produced per year (365 days) by the heater, assuming continuous operation?
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