what is the haet flux due to radiation across one square meter of fin surface area in a vehicle's aluminum radiator if it has a black anodized coating if the average coolant temperature is 112 degrees C?
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what is the haet flux due to radiation across one square meter of fin surface area in a vehicle's aluminum radiator if it has a black anodized coating if the average coolant temperature is 112 degrees C?
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- 1.54 The soldering iron tip in Problem 1.53 becomes oxidized with age and its gray-body emittance increases to 0.8. Assuming that the surroundings are at 20°C, determine the power requirement for the soldering iron.1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .QUESTION 9 A manufacturing factory located at 30° N latitude has a window area 35 m² that consists of double- pane windows made of clear glass (SHGC = 0.766) as given in the Figure Q2. To reduce the solar heat gain on a hot day, a reflective film that reduce the SGHC to 0.261 is considered. The building need cooling during the months of June, July, August and September and need heating during the months of October through April. The average daily solar heat fluxes incident on the west side of this latitude is given in the Table Q2 below. The unit cost of electricity and the natural gas are RM 0.30/kWh and RM1.75/therm, respectively. If the coefficient of performance of the cooling system is 3.0 and the efficiency of the furnace is 0.80. Determine: i. the net annual cost savings due to installing reflective coating on the windows ii. the simple payback period if the installation cost of the reflective film is RM 70/m² Glass Solar Radiation Reflective film KAir space Reflected…
- 20. PLEASE ANSWER ASAPProblem Statement A large plate of insulating material 8 cm thick has in it a 3 cm-diam hole, with axis normal to the surface. The temperature of the surroundings are 1800 K at one side of the plate and 400 K on the other side. Insulating plate D= 3 cm H= 8 cm Considering the sides of the hole to be black, (a) Draw a system of resistors that can be used to solve for the various heat transfer rates. For full credit you must label all "voltages", "currents," and resistances present. (b) Estimate the radiative heat transfer through the hole.**33. ssm A solid cylinder is radiating power. It has a length that is ten times its radius. It is cut into a number of smaller cylinders, each of which has the same length. Each small cylinder has the same temperature as the original cylinder. The total radiant power emitted by the pieces is twice that emitted by the original cylinder. How many smaller cylinders are there?
- A small sphere (emissivity =0.503 radius=r1) is located at the center of a spherical abestos shell ( thickness =1.74 cm, outer radius= r2; thermal conductivity of abestos is 0.090 J/ (sm c degrees) The thickness of the shell is small compared to the inner and outer radii of the shell. The temperature of the small sphere is 695 degrees Celsius while the temperature of the inner surface of the shell is 352 degrees Celsius, both temperatures remaining constant. Assuming that r2/r1 =8.75 and ignoring any air inside the shell, find the temperature in degrees Celsius of the outer surface of the shell.A small sphere (emissivity = 0.745, radius = r1) is located at the center of a spherical asbestos shell (thickness = 1.72 cm, outer radius = r2; thermal conductivity of asbestos is 0.090 J/(s m Co)). The thickness of the shell is small compared to the inner and outer radii of the shell. The temperature of the small sphere is 727 °C, while the temperature of the inner surface of the shell is 406 °C, both temperatures remaining constant. Assuming that r2/r1 = 6.54 and ignoring any air inside the shell, find the temperature in degrees Celsius of the outer surface of the shell.•A thin disk-shaped wafer (diameter-=30cm) is maintained at T=100oC. The wafer loses heat to the room by convection and radiation from its upper surface while heat is supplied constantly from below. Assuming the surrounding air at 20oC and all surrounding surfaces (isothermal/blackbodies) at T=15oC. How much heat (in W) must be supplied to the wafer? h wafer-air= 30W/m2K Emissivity of wafer’s surface(gray body)=0.85
- A spherical radiator has a radius of 3ft and emissivity of 0.5. If radiates 6000 Btu/hr of heat at 3000R, what is the temperature of a surface affected by its radiation?QUESTION 6 A simple solar collector in Figure Q1 is built by placing a 5 cm diameter clear plastic tube around a garden hose whose outer diameter is 1.6 cm. The hose is painted black to maximize solar absorption, and some plastic rings are used to keep the spacing between the hose and the clear plastic cover constant. During a clear day, the temperature of the hose is measured to be 65 °C, while the ambient air temperature is 26 °C. Determine the clear plastic tube temperature and the rate of heat loss from the water in the hose per meter of its length by natural convection. Solar radiation ||| 26°C Clear plastic tube Water Spacer Garden hose 65°C Figure Q1Note:- • Do not provide handwritten solution. Maintain accuracy and quality in your answer. Take care of plagiarism. • Answer completely. • You will get up vote for sure.
