(ii) 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.
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- Consider the heating of water in a pan on a top of a range. If 24 kJ of heat is transferred to the water from heating element and 6 kJ of it is lost from the water to the surrounding air. Determine;(a) the net heat transfer to the water,(b) the efficiency for boiling water.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?2-81 When a hydrocarbon fuel is burned, almost all of the carbon in the fuel burns completely to form CO₂ (carbon dioxide), which is the principal gas causing the greenhouse
- THERMOFLUID A student living in a 3-m X 4-m X 4-m dormitory room turns on her 100-W fan before she leaves the room on a summer day, hoping that the room will be cooler when she comes back in the evening. Assuming all the doors and heat trans windows are tightly closed and disregarding any heat fer let through the walls and the windows, determine the temperature in the room when she comes back 8 h later. Use specific heat values at room temperature, and assume room to be at 100 kPa and 20°C in the morning she leaves.A freezer has a coefficient of performance of 2.40. Thefreezer is to convert 1.80 kg of water at 25.0C to 1.80 kg of ice at-5.0C in one hour. (a) What amount of heat must be removed from thewater at 25.0C to convert it to ice at -5.0C? (b) How much electricalenergy is consumed by the freezer during this hour? (c) How muchwasted heat is delivered to the room in which the freezer sits?Alvariga Multipurpose Logging Corporation situated in Sorsogon operates aDiesel Electric Plant to supply its electric energy requirements. During a 24 hourperiod, the plant consumed 250 gallons of fuel at 80 deg F and produced 2700KW-hours. Industrial fuel used is 30 deg API and was purchased at P3.00/litersat 60 deg F. Determine the heating value of the fuel in Btu/lb by ASME formula
- A tray of liquid water is placed in a freezer where it cools from 20 dgeC to -5 degC. What is the total amount of energy needed to freeze per unit of liquid water? The specific heat of ice is half of the specific heat of liquid water. The latent heat of fusion for water is 335 kJ/kgWhy do the heat engine manufacturers seek for new materials, coatings that can withstand even higher temperatures than the available ones do? Please explain from the 2nd law of thermodynamics point of view.why the coefficient of performance of a heat pump is always greater than 1. Use values such as W, Qin and Qout values to justify your answer.
- Calculate the amount of energy required in BTU to heat the air in a 10'Fhoune 30 by 50 by 40 ft and increase the temperature by 70F at constant pressure. O 75600 O 8400 O65700Determine the quantity (volume) of saline water in a steam generator. The heat energy of 1631 kJ is supplied to saline water in the steam generator to heat from 23ºC to 115ºC for the generation of water vapor, Take the density & specific heat of the solution as 1010 kg/m3 & 3.8 J/kgºK respectively. Solution: Change in Temperature (in K) Mass of the saltwater (in kg) Quantity (Volume) of saltwater (in m3)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.