Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Chapter 8, Problem 8.12P
An electric room heater has been designed in the shape of a vertical cylinder 2 m tall and 30 cm in diameter. For safety, the heater surface cannot exceed
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Temperature of cooling chamber of refrigerator is kept at T1 = 280 K. If the surrounding temperature 1.5 times the temperature of cooling chamber, find the COP of refrigerator.
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Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
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- How many Btu/h would be produced in a 12-kW electricheater?arrow_forwardThere are 40 people sitting in a 20°C room with 60 m? area and 3 m height ceiling. A single person produces about 120 W body heat, and you worry that the room will get hot, so you switch on the AC. Theoretically, at least how much power does it need to run the AC (a heat pump) cooling this extra body heat if the outside temperature is 40 C?arrow_forward2) The energy consumed by a shower for 30 days is 22kwh. It is known that the resistance of the showerhead is 20 ohms and that its nominal current is 15A. So, what is the time in minutes that the shower was turned on during this period?arrow_forward
- i need the answer quicklyarrow_forwardA constant temperature of -125 C must be maintained in a cryogenic experiment, although it gains 120 W due to heat transfer. What is the smallest motor you would need for a heat pump absorbing heat from the container and rejecting heat to the room at 20 Carrow_forwardThe heat loss from a chicken coop (chicken house) is K(Tnside - Totside) during the winter, where K is 1.5 kW/K. The chicken coop temperature can vary between 15 °C and 25 °C without harming egg production. A heat pump with a coefficient of performance of 40% of that of a reversible heat pump is used to heat the chicken coop. What are the minimum power requirements if the outside temperature is -5 °C? .arrow_forward
- You are considering two heaters in your house which must provide 10kW of heating. You expect to run it for 100 days per year, 16 hours per day. The first heater is gas and has an effiency of 40% but gas costs .01 cents per kWhr (kilowatt - hour) The electric heater is 82% efficient but the cost of electricity is .03 cents per kWhr Which is the cheaper option?arrow_forwardA family enters a winter vacation cabin has been unheated for such a long time the interior temperature is the same as the outside temperature (00C). The cabin consists of a single room of floor area 4m by 4m and height 3m. The room contains one 2kW electric heater. Assuming that the room is perfectly airtight and that all the heat from the electric heater is absorbed by the air, none escaping through the walls or being absorbed by the furnishing, how long after the heater is turned on will the temperature reach the comfort level of 240C.arrow_forwardElina is a businesswoman who is looking for a new invention to invest. One of the entrepreneur claimed to have a device which has 50 kJ of heat transfer at 500 K. The device having heat transfer of 250 K released to the environment and does 20 kJ of work. If you were Elina, would you willing to be one of the investor for the device?arrow_forward
- A 2-kW electric resistance heater in a room is turned on and kept on for 30 min. Find the amount of energy transferred to the room by the heater.arrow_forwardagain i am uploading this question please explain The amount of heat extracted in the evaporator of the refrigerator is small as compared to the heat rejected in the condenser. Therefore when the door of refrigerator is kept open it does not cool the room but instead it heats up the room because less heat extracted from the room is less as compared to the heat rejected to the room. Therefore a person will feel warm while sitting in front of the open refrigerator inside the room. However if the refrigerator is lying in the open, then it will no way effect the feel of warmth or coldness to the person.arrow_forwardQ2) A long horizontal wire of 0.2 mm diameter has a constant temperature of 54 C caused by an electric current. This wire is placed in cold air whose temperature reaches 0 C. Find the required electric power to keep the wire temperature at 54 C.arrow_forward
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