Answer Happy

will then estimate the temperature of the cold plate with and without convective heat loss and discuss how the estimates compare to the experimental values collected Table 1. Experimental Data from Radiation Heat Transfer Experiment Run Temperature of the Temperature of cold plate, ("F) Average temp Room hot plate, ("F), T1 of cold plate temperature T2 T3 T4 T5 ("F) (F) 1 185 183 164/166 2 534 185 183 184 137 3 154 167 1921 4. 535 US 164 Caleulation Procedure for Radiation Heat Transfer Experiment 1 Determine the hot plate temperature, T,in K 2. Determine the average measured cold plate temperature, T., in K 3. Determine the surrounding temperature, T, in K 4. Combining steps 2 and 3 estimate a convective heat transfer coefficient, h in W/(m°C). One equation that is used for a vertical plate is shown in Equation 1. 0 387 R'). Nu = 0.825 (1) 0.492 Pr Ra in Equation (1) is the Rayleigh number and is defined in Equation (2). 98 T Ra- -1. LP v (2) 5. Determine the radiation view factor from the hot plate to the cold plate, F. To do this you will need to know the dimensions of the plates and the spacing (if any) between the plates, there are equations or graphs in heat transfer books that will predict this radiation view factor once that information is known. 6. Using the reciprocity rule determine the radiation view factor from the cold plate to the hot plate, F. 7. Determine the radiation view factor from the cold plate to the surrounding, F. Knowing that the plate is flat, and Fa; by using the summation principle F., is determined.
RADIATION HEAT TRANSFER This laboratory experiment will model and study radiation heat transfer. The physical set-up is displayed in Figure 1. You are to make the best estimate of the temperature of a "non- conducting, re-radiating" Cold Plate which is exchanging heat with the Hot Plate, which is maintained at a measured temperature. Radiation heat transfer is very important in many areas of engineering. Radiation heat transfer i used to quickly and efficiently dry paint, heat plastics prior to forming, and weld plastics. Radiation heat transfer is also used in many typical applications such as comfort heating in cold areas such as entrances to airports, hotels, open-air bus stations, or warehouses, food cooking a warming, and animal husbandry (such as keeping reptiles or newborn animals warm). For example, one modeling software predicted that heating a warehouse with a radiant heater instead of forced air would reduce energy use by 33% because the infrared heater only heats people and objects, which leaves the air cooler which results in much less heat loss through the walls and ceiling and when air leaves the building through doors or exhaust fans. There are two square aluminum plates that are 1 ft by 1 ft (0.3 m by 0.3 m) which are coated with high temperature flat black paint. One of these plates is placed over the heater and is kept heated. To ensure steady-state conditions, the experiment will be started two hours or so befor the students are allowed to observe the readings. lft Cold Plate (Receiver plate) 1 ft Hot Plate (Radiating plate) Heater Figure 1. Radiation Heat Transfer Experiment There will be thermocouples connected to the radiating (hot) and receiving (cold) plates. Y will perform the experiment and measure the experimental temperature of the cold plate. Y