Air is delivered to a room at 58 F and the same amount of air is removed from the room at 76 F in order to provide sensible cooling. The room requires 0.5 tons of cooling to remain at a steady 76 F. That must the aifflow rate be in cfm? sume an air densiW of 13.5 cubic feet per pound mass and a
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Heating, Ventilation, and Air Conditioning: Analysis and Design
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Introduction to Heat Transfer
- What is the filtering velocity for a haghouse with N compartments?arrow_forwardA laboratory space to be maintained at 24oC DB and 50% RH experiences a sensible-cooling load of 42 kW and a latent load of 18 kW. Because the latent load is heavy, the air-conditioning system is equipped for reheating the air leaving the cooling coil. The cooling coil has been selected to provide outlet air at 9 oC and 95% RH. What is (a) the air rate and (b) the temperature of supply air? Air pressure is 101.325 kPaarrow_forwardA fluid with a surface film coefficient of 500 W / m2 ° C flows through a tube with a meter length peak (k = 40W / m ° C) with an inside diameter of 90 mm and an outside diameter of 110 mm. The film coefficient between the pipe surface and the air is 30 W / m2 ° C and there is air at 20 ° C outside environment. What is the heat loss transferred from the pipe to the outside environment?A.) 2050B.) 1875C.) 1902D.) 1715E.) 1934arrow_forward
- Radiators are used in most of the houses’ heating. If we happen to place a sofa justin front of our heating radiator, how will the heating of the room be affected? Explain.arrow_forwardThe moisture removed from a material is 200 lb/hr and change of humidity ratio of air in the dryer is 105 grains/lbmd.a. Determine the fan capacity in cfm if specific volume of air entering is 38 ft3 /lb.arrow_forwardHeat is produced by computers while they run. Do you have any questions concerning computer cooling systems?arrow_forward
- 1.15 A thermocouple (0.8-mm-diameter wire) used to measure the temperature of the quiescent gas in a furnace gives a reading of . It is known, however, that the rate of radiant heat flow per meter length from the hotter furnace walls to the thermocouple wire is 1.1 W/m and the convection heat transfer coefficient between the wire and the gas is K. With this information, estimate the true gas temperature. State your assumptions and indicate the equations used.arrow_forward1.80 Describe and compare the modes of heat loss through the single-pane and double-pane window assemblies shown in the sketch below. Problem 1.80arrow_forwardDetermine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip is a cylinder 3 mm in diameter and 10 mm long. The surrounding air temperature is 20C, and the average convection heat transfer coefficient over the tip is 20W/m2K. The tip is highly polished initially, giving it a very low emittance.arrow_forward
- What external data can I use to support the claim that the consumers living within regions with hot climate will buy the stainless steel pan with digital thermometer reading that is powered by the heat generated while cooking and that sales will be higher in summer?arrow_forwardResidual oil, with a heating value of 18,480 BTU/lbm, is used as a fuel in a power plant which produces 947,870 BTU/s of electricity. The overall efficiency of the power plant is 52%. Determine the: a. Heat input, in BTU/s b. Daily fuel consumption, in lbm c. Dimensions of the cylindrical storage (assuming length is equal to the diameter), in ft. d. Heat rejected to the environment, in BTU/s. The density of the oil is 62 lbm/ft3arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning