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Q: 30KN 30KN 30KN D 30KN 30KN 30kN 30kN G B N. H 30 A h 30° M K -4 mt4 m4mt4m4m-
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- NSLOM using Differential EquationsModel the problem in terms of a differential equationDerive the finite different equations for all the nodes/boundaries in the plate. For this, a small grid is recommended (3x3 at least) T=100 C T=0 C h=200W/m?C q"=100W/m? Insulated pls, do by hand in details by ENERGY BALANCE METHOD
- QL.Compute the total heat gain load from all the sources into the lunchroom ,if the lunchroom is located at the top floor of an air conditioned commercial building. The lunchroom has one exposed wall facing SE. -Wall facing SE, (20 * 15); 12 brick, the overall heat transmission value(U) is 0.3 Btu/hr.ft². F. -Roof; 6 concrete with 2" insulation, Uroof 0.4 Btu/hr.ft².F - Windows facing SE ;No.(3), (3 *3),single regular plate,double-hung metal windows,weather-stripped; unlocked ,shaded with white inside roller shade,half drawn. -Occupants: (10) persons; sedentary work. -Lightening :2 Watt /ft² of the floor area (40' *20) -Outside conditions: T= 100 F (db) & T70(wb), DR =25 F, Vwind -10 mph. -Inside conditions: T-70 F (db) & Q=40%. -Location: 40 N.L, Time = 11 A.M.4- Calculate temperatures for nodes 1 to 6 which is the steady-state. h = 12 W/m²**C T = 15°C 2 T = 50°C 3 T = 50°C Ax = Ay = 25 cm k= 1.5 W/m "C T = 50°CProblem 9-3: A T-type thermocouple is used to measure temperature difference across insulation in the ceiling of a residence in an energy monitoring program. The temperature difference across the insulation is used to calculate energy loss through the ceiling from the relationship Q = k Ac (AT) where Ac = ceiling area = 15 m² k = insulation thermal conductivity = 0.4 W m°C L = insulation thickness = 0.25 m AT = temperature difference = 5°C Q = heat loss (W) The value of the temperature difference is expected to be 5° C, and the thermocouple emf is measured with an uncertainty of ±0.04 mV. Determine the required number of thermopile junctions to yield an uncertainty in Q of ±5% (95%), assuming the uncertainty in all variables other than AT may be neglected.
- Figure 3 shows cross section of a duct. If each wall is 100 cm, surface C is insulated, and duct is very long. Evaluate; a) net radiation per meter of duct for surface A, b) temperature of surface C, and c) effect of changing in the value of ɛ, on the results. C,T3, ɛ3 = 0.8 Figure 3 B,T2 = 700 K, ɛ2 = 0.5 A,T, = 1000 K,ɛ, = 0.33The surface area of an unclothed person is 1.5m ^2 and thier skin tempature is 33 degree celcius. This ideal person is located in a room with a tempature of 65 dregrees F. and has an emissivity of e=0.95 suppose the room has dimensions 4mx9mx18m a) suppose you and your closest 10 friends come into this room and heat it up. suppose your clothes are in equilibium with your skin and have the same tempature and emissivity. Further suppose that your net power into the room remains constant . How long does it take before the room to get to hot say 95 degreesThe term dT/dx Where T is temperature and x is length, in Fourier law conduction, is called Temperature GradientRequired to answer. Single choice. OPTIONS: 1.May be 2.May not be 3.True 4.False
- 36 -S 42 2. Metal castings can sometimes develop a gap between the casting and mold as the molten metal hardens. The result can be a substantially altered cooling process. Set up a simple heat-transfer model that would let you look at the effect of the gap on the cooling process. Assume the casting and mold are square in shape, with an air gap of thickness das shown in the figure. The mold sits in some ambient room temperature. State clearly all assumptions and develop a corresponding model of the heat transfer problem. Assuming that the casting is aluminum, the mold is diatomaceous earth and the gap is filled with air, see if you can arrive at and summarize some insight into the effect of the gap and its size on the heat transfer process.Select the correct statement for a radial conductivity exp Select one: a. The mid outer surface represent the heating area while the side surface represent the cooling area b. None of them is true c. The inner section represent the heating area and the outer section represent the cooling area d. The outer section represent the heating area and the inner section represent the cooling areaWhat are the Conduction from Fluid to Fluid Fomulas?