Calculate the power radiated by a woodstove of dimensions 65 cm high by 55 cm deep by 85 cm wide with a surface temperature of 120°C. Assume that heat is radiated from all surfaces of the stove and that the stove has an emissivity of 1. Note that woodstoves are painted black because black surfaces have high absorptance, and objects with high absorptance also have high emissivity.

Calculate the power radiated by a woodstove of dimensions 65 cm high by 55 cm deep by 85 cm wide with a surface temperature of 120°C. Assume that heat is radiated from all surfaces of the stove and that the stove has an emissivity of 1. Note that woodstoves are painted black because black surfaces have high absorptance, and objects with high absorptance also have high emissivity.

Sustainable Energy

2nd Edition

ISBN:9781337551663

Author:DUNLAP, Richard A.

Publisher:DUNLAP, Richard A.

Chapter8: Direct Use Of Solar Energy

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Compare the masses and volumes of water, concrete, sand, and wood needed to store 106 Btu of heat if the operating temperatures are Tc = 85F and Th = 180F. In each case, calculate the edge length of a square storage unit with a height of 8 ft.
1. An unknown lamp placed 6m from a photometer screen provides the same illuminance as a 90 cd lamp placed 4 m from the screen. What is the candlepower of the unknown lamp? 2. The illuminance of a room 20 ft x 15 ft is being designed. The illuminance required is 50 footcandles. What is the total required lumens output of the lamp assuming room and luminaire efficiency of 42%?
A stove element draws 15 A when connected to a 240-V line. How long does it take to consume 60 kJ .
Q1; If a system has 30J of heat added to it, and the total change in its internal energy is 10J, how much work does it do? a- 70 J b- 0.0 J c- 10J d- 20 J e- 10 J
A standpipe 8 m in diameter and 13 m high is filled with water. Calculate the potential energy of the water if the elevation datum is take 5 m below the base of the standpipe. (kN-m) Round your answer to 2 decimal places.
A refrigerator is to remove heat from the cooled space at a rate of 300.74 kJ/min to maintain its temperature at -8 C. If the air surrounding the refrigerator is at 28.91 C, determine the minimum power input (kW) required for this refrigerator.
You serve as the president of XYZ corporation, which is an energy intensive manufacturing operation. You have four boilers to produce steam and electricity for your operations. One is a semi-suspension fired boiler with a capacity of 100 tons of coal per hour. The boiler can also burn supplemental fuel such as coconut or macadamia nut shells. The other three boilers arc peaking units and burn fuel oil. The City of Podunk has approached you about the possibility of burning solid waste as a supplemental fuel. As the president of the XYZ Corporation, you need to develop answers to many political, social, and technical questions before you make a commitment to the city. a. What specific questions would you ask your own power plant engineer about the possibility of accepting Podunk’s MSW? b. What specific additional data would you need from the city before you discuss this further?
The Energy Efficiency Rating (EER) of an air-conditioning unit is defined asthe ratio of the heat removed in Btu/h divided by the energy used in watts.The EEI (Edison Electric Institute) names an air-conditioning unit as anEnergy Star unit if it has an EER of 13 or greater. A 21⁄2-ton air-conditioningunit uses 2.41 kilowatts (2,410 watts) of energy. One ton is equivalent to12,000 Btu/h. Can this unit be termed an Energy Star unit?
Complete the following sentences (showing your calculation): The R- value for a 50 mm wood fiber insulation board (k= 0.044 W/m.K)= ……….................................................................................................... The U- value for a 120 mm clay roofing tile (k= 0.75 W/m.K)= .................. The light solar gain ratio for a window with the following characteristics (U= 1.11 W/m2.K, SHGC = 86%, VT= 90%)…………………………………………………………. In a room (8*6*3.5) if the total heat losses is 1000 Watt and the percentage of ceiling losses from total was 20% , if we treat just the ceiling such that we reduce her losses by the half what will be the new total losses for the room …………………………………………………….........................................................…..
A portable heater is listed for 115 volts. It uses 12 amperes of current. Whatis the resistance of the heater?