Select comfortable summer design conditions (dry bulb and relative humidity) for a machine shop where people in light clothing
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- A package of frozen fish sticks have different instructions when they are heated up on the stove as compared to using the oven. Stove: Heat over medium flame for 2 minutes. Then flip the fish sticks (turn them over) and heat them for another two minutes. Oven: Preheat the oven to 375 F. Put them on a metal baking sheet for 15 minutes. a. Explain why the instructions have you flip the fish sticks over when you’re heating them with the stove, but not with the oven. b. If you follow the oven instructions, the side of the fish sticks touching the metal baking sheet will cook more than the top side of the fish sticks. Explain why.arrow_forwardProject 4: Pipe lagging is an insulation fitted around pipes to maintain energy loss at minimum and prevent any freezing or bursting. Your part in the HTU thermodynamics and heat transfer lab is to conduct an experiment to explore the heat losses that would occur in both lagged and unlagged hot water pipe. The required tools and main apparatus are shown in Figure.4 and general schematic is shown in Fugure.5. Figure.1, shows the pump for providing running the cycle, thermocouple for measuring the temperature and the pipe coil. Your lab instructor asked you to perform the following tasks: • Fit the lagging around the pipe • Connect the pump to inlet of coil • Measure the hot water terampere at the inlet (make sure the temperature reaches its steady state before measuring it) • Operate the cycle by turn on the pump • Measure the cold water terampere at the outlet in steady state. • Repeat the previous step with unlagged pipe • Search for an appropriate video where a test to measure the…arrow_forwardA solar panel is mounted on the roof of a house. Fig. 4.1 shows a section through part o solar panel. sunlight trapped air copper pipe, painted black water glass sheet insulating material metal backing sheet, painted black Fig. 4.1 A pump makes water flow through the copper pipes. The water is heated by passing through solar panel. (a) Select and explain three features of the solar panel that maximise the final temperatur the water.arrow_forward
- Methods used to calculate the heat gain and heat loss of a structure should A. provide the same results for all houses with the samesize footprint. B. provide only a very rough estimate of the needs of thestructure. C. be nationally recognized and accepted. D. All of the above are correct.arrow_forwardUsing the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?arrow_forwardDraw the thermal circuit for heat transfer through a double-glazed or a double-paned window. Identify each of the circuit elements. Include solar radiation to the window and interior space.arrow_forward
- please provide step-by-step calculationsarrow_forwardstep-wise solution pleasearrow_forward5. For the process flow below in the yellow highlighted boxes: (i) Mark off location of mask and resist; Label the process step in (ii). Label the process step in (i). Label the process flow in (iv). LMark-off Expose location of resist Develop : =: and mask (left) Material Material iL Label this process step i. Label this process step Material w. Label this process step Dope, redeposit resist and re-do Materialarrow_forward
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