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- 1.60 Two electric resistance heaters with a 20 cm length and a 2 cm diameter are inserted into a well-insulated 40-L tank of water that is initially at 300 K. If each heater dissipates 500 W, what is the time required for bringing the water temperature in the tank to 340 K? State your assumption for your analysis.Heat is transferred at a rate of 0.1 kW through glass wool insulation (density=100kg/m3) with a 5-cm thickness and 2-m2 area. If the hot surface is at 70C, determine the temperature of the cooler surface.Consider the process of baking potatoes in a conventional oven. Can the hot air in the oven be treated as a thermal energy reservoir? Explain.
- If heated at the same rate and in the same manner, which would have a more even heat distribution during heating, a copper pan or a cast iron one? Why?A refrigeration plant stored 10 metric tons of eggs at a temperature of 15°C. To preserve the eggs by not spoiling them, they have to be cooled at -8°C. What is the refrigerating capacity of the plant in TOR if it is cooled for 12 hours? The specific heat of the eggs above and below freezing are 0.95 kcal/kg-°C and 0.4 kcal/kg-°C, respectively. The latent heat of fusion is 68.5 kcal/kg The freezing temperature is -3°C.Baseboard heaters are basically electric resistance heaters and are frequently used in space heating. A homeowner claims that her 5-year-old baseboard heaters have a conversion efficiency of 100 percent. Is this claim in violation of any thermodynamic laws? Explain.
- An automobile engine consumes fuel at a rate of 22 L/h and delivers 55 kW of power to thewheels. If the fuel has a heating value of 44,000 kJ/kg and a density of 0.8 g/cm3, determinethe efficiency of this engine. Hint, Qa= mass of fuel * heating value.Consider the energy generated by a TV set. What is a suitable choice for a thermal energy reservoir?It is well known that the power consumed by a compressor can be reduced by cooling the gas during compression. Inspired by this, somebody proposes to cool the liquid as it flows through a pump, in order to reduce the power consumption of the pump. Would you support this proposal? Explain.
- Gases after combustion are discharged from a flue in a facility to the atmosphere at a temperature of250 °C and a flow rate of 25000 m3/h. It is desired to benefit from the heat of this waste gas in heating.There is a site with 40 residences, each with a heating load of approximately 8 kW, located 3 km fromthe facility.1- Determine the substation capacity to be used, taking into account the hot water requirement foreach house on the site.2- Determine the substation inlet/outlet temperature and the heat exchanger water inlet/outlettemperatures. The temperature of the water leaving the heat exchanger is required not to exceed 95° C. The pipeline between the facility and the site is underground pipeline. Determine the requireddata by considering the region where the facility is located, calculate the heat losses in the line andfind the required insulation thickness.3- Calculate the total capacity including losses and determine the required exchanger dimensions. (Can you solve it with the…An automobile engine consumes fuel at a rate of 22 L/h and delivers 55 kW of power to the wheels. If the fuel has a heating value of 44,000 kJ/kg and a density of 0.8 g/cm3, determine the efficiency of this engine. Hint, Qa= mass of fuel * heating value. And draw the P-V and T-S diagram.The U.S. Department of Energy estimates that 570,000 barrels of oil would be saved per day if every household in the United States lowered the thermostat setting in winter by 6°F (3.3°C). Assuming the average heating season to be 180 days and the cost of oil to be $55/barrel, determine how much money would be saved per year.