3. From a laboratory experiment, it is found that a grey body ‘A’ of area 2...
3. From a laboratory experiment, it is found that a grey body ‘A’
of area 2 m2, radiates about 200 kW at 1500 K.
a) Calculate the power output of this device at 1400oC. [6] b) Grey
Body ‘A’ is rectangular in shape with a ‘View Factor’ of 0.25.
There is a black body
(B) of area 0.8 m2 in the vicinity to which heat must be
transferred from ‘B’, please estimate what is the net heat energy
transferred between the 2, with B being at a temperature of 750 K.
[6]
Homework Answers
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3. From a laboratory experiment, it is found that a grey body ‘A’
of area 2...
QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in...
QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in the air. Assuming the body closely approximates a blackbody, determine the rate at which the cube emits radiation energy, i n kW 30.6 80.4 61.4 324.2 134.7 QUESTION 7 Determine the hydraulic diameter (Dh) of the duct (pipe) section shown in the following figure. (Assume: b 40 and h 20) 43.8 57.6 48.1 66.2 (8-11) Consider the arrangement of the three black surfaces shown...
How much power (power is the energy per second) is radiated by the person
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please solve these questions
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3)
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Uestion 2 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m'/s. Air leaves the...
uestion 2 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m'/s. Air leaves the coil with of h2-50 kJ/kgda. i an enthalpy a) Find each of the initial and final states the dry and wet temperatures, dew point, relative humidity, humidity ratio, specific volume. b) Imagine a simple transformation to reach a dry temperature of 25°C and a relative humidity of 50%. What is the nature of this transformation? What is the required heat...
Please solve all 8 parts (heat & mass) Problem 8.075 3.07 cool a sum mer home...
Please solve all 8
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The heat that is conducted through a body must frequently be removed by other heat transfer...
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
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QUESTION 6 Consider a 30-cm x 30-cm x 30-cm cubical body at 1000 °C suspended in the air. Assuming the body closely approximates a blackbody, determine the rate at which the cube emits radiation energy, i n kW 30.6 80.4 61.4 324.2 134.7 QUESTION 7 Determine the hydraulic diameter (Dh) of the duct (pipe) section shown in the following figure. (Assume: b 40 and h 20) 43.8 57.6 48.1 66.2 (8-11) Consider the arrangement of the three black surfaces shown...
Radiation of Energy The rate of heat transfer by emitted radiation is determined by the Stefan-Boltzmann law of radiation: = aeAT4 where o 5.67x10-8 J/s - m2 K is the Stefan-Boltzmann constant, A is the surface area of the object, and T is its absolute temperature in kelvin. The symbol e stands for the emissivity of the object, which is a measure of how well it radiates An ideal jet-black (or black body) radiator has e 1,whereas a perfect reflector has...
pts per question) 1. A 2 m piston cylinder device contains nitroen gas at 200 kPa and 350K. Now heat is transferred to the nitrogen in the tank and the pressure of nitrogen rises to 900 kPa and volume is maintained at same. The boundary work done during this process is (a) 1080 kJ (b) 840 k (c)240 k 2. A heat engine receives heat from a source at 727°C and rejiects the waste heat to a sink at 27°C,...
please solve these questions
(a) Calculate the rate of heat transfer by radiation from a car radiator at 120 °C into a 55 °C environment, if the radiator has an emissivity of 0.75 and a 1.1-m surface area. Enter your answer in kilowatts. (b) Calculate the fraction of this radiative power to the total heat transfer by an automobile engine. Assume a mechanical horsepower of 200 hp (150 kW) and the efficienty of automobile engines as 25 %. Express your...
1)
2)
3)
PROJECT #1 (2.5 Marks): The heat that is conducted through a body must frequently be removed by other heat transter processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width Z 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature 1. The conductivity of the aluminum...
uestion 2 Moist air, saturated at 5°C, enters a heating coil at a rate of 10 m'/s. Air leaves the coil with of h2-50 kJ/kgda. i an enthalpy a) Find each of the initial and final states the dry and wet temperatures, dew point, relative humidity, humidity ratio, specific volume. b) Imagine a simple transformation to reach a dry temperature of 25°C and a relative humidity of 50%. What is the nature of this transformation? What is the required heat...
Please solve all 8
parts (heat & mass)
Problem 8.075 3.07 cool a sum mer home without using a vapo D compression refrigeration cycle, ar is routed through a plastic ppe k = 0.15 Wm K D, 0.15 m -17 C and with a smooth interior surface that is submerged in an adjoining body of water. The water temperature is nominally at T a crivection cemcient of ho = 1500 W/m2-K is maintained at the outer surface of the pipe....
The heat that is conducted through a body must frequently be removed by other heat transfer processes. For example, the heat generated in an electronic device must be dissipated to the surroundings through convection by means of fins. Consider the one-dimensional aluminum fin (thickness t 3.0 mm, width 20 cm, length L) shown in Figure 1, that is exposed to a surrounding fluid at a temperature T. The conductivity of the aluminum fin (k) and coefficient of heat convection of...
1. 1. The primary energy savings in tep (1 MWh -0.086 tep) and diesel, which involves the direct use of heat from a geothermal resource to cover a heat demand of 100 kW for 3,500 h / year, assuming that this demand will be covered with diesel boiler of average yield 0.8 (for diesel 1.12 tep/ton gas oil), they are: a) 30.1 tep/year, 26.9 ton/year b) 37.6 tep/year, 33.6 ton/year c)41.2 tep/year, 36.8 ton /year 1. 2. A hydraulic pump...
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