6. An electric hot plate is placed in a room which is maintained at a temperature of 297 K.The plate is maintained at a temperature of 403 K and has an emissivity of 0.8. If the platesurface resembles a circular disc of diameter 250 mm, electrical power consumed by the hotplate will be;a. 22 Wb. 65 Wc. 75 Wd. 86 W

Given: Tr=297 K Tp=403 K D=250 mm= 0.25 m To determine: Power consumed

Answered: electrical power consumed by the hot

Engineering

Mechanical Engineering

electrical power consumed by the hot

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter11: Heat Transfer By Radiation

Section: Chapter Questions

Problem 11.6P

See similar textbooks

Related questions

Q: 00 m/s w ne inlet is

Q: How Convert [2ton] (refrigeration) to [m^3/sec]

Q: Choose from the options listed inside the parenthesis: Objective of Refrigeration: maintain a…

A: Objective of Refrigeration: maintain a cold temperature in a warm space by removing QH from it.

Q: Q. Mention the main requirements gf a steam condensing plant.

A: The answer is

Q: thermal efficiency. 64.59% amount of heat added. 556.7054 kJ the maximum gas pressure and…

A: Given: Dual cycle Compression ratio= 14 cutoff ratio= 1.2 pressure ratio = 1.5 P1= 80 kPa T1=20oC…

Q: net heat rejected to reservoir C by CE-2

A: Given data; Carnot engine (CE-1) works between two temperature reserviors A and B;TA=900…

Q: pace at 10 late st air supplied to the space gain of space in kW. d. of the air cooler in kW

A: given:

Q: Min. power required to pump the water

A: Given data; ρ=1850 kg/m3m=2.5 kg/s∆p=130kpa=130000 Pa

Q: A 1-ton HVAC unit will remove up to 12,000 Btu/h. What size unit is neededfor a house with a heat…

A: Given1 ton HVAC unit will remove heat Q1= 12000Btu/hHouse with heat load Q2=28576Btu/h

Q: what is the COP of this refrigeration system.

A: Condenser temperature, Tc=40oCEvaporator 1 and 2 temperature, Te,1,2=-10oCEvaporator 3 temperature,…

Q: rom a hot reser ir is - 4 kJ/K,

Q: Which part in the mechanical heat pump is used to increase the refrigerant pressure? Select one: a.…

A: Given Data : Mechanical heat pump

Q: The refrigerant leaving the .7 compressor follows

A: This question is based on the concept of refrigeration process and refrigeration cycle.

Q: refrigerator B00 K. Its

Q: lled purposely to cool us available at the rate

A: The heat transfer between two things is proportional to the temperature differential between them.…

Q: what is meant by each of the following? 1. Refrigerant 2. GWP factor 3. TEWI 4. Brines 5. eutectic…

A: As per the Bartleby answering guidelines we are supposed to answer first Question only. please…

Q: Discuss unit of refrigeration?

A: The standard unit of refrigeration in vogue is ton refrigeration or simply ton. It is denoted by TR.

Q: True or False: All heat pumps are practical anywhere inthe United States. Explain your answer.

A: A mechanical device called a heat pump is used to move heat from a high-temperature source to a…

Q: ate in the following refrigeration cycle is:

Q: Define the objective of a heat pump is to supply heat QH into the warmer space.

A: The heat pump is a device that is used to supply heat to the system at high temperatures known as…

Q: 2.4 Calculate the thermal efficiency of the plant.

Q: Water needs to be delivered from a tank to another one that is 40 ft above the first tank. The water…

A: Given: Potential head is 40 ft. Heat lost through heat exchanger is 30,000 BTU/min. Flow rate is 45…

Q: How to receive heat from a high-temperatureDefine the sources.

A: Thermal Engine: A thermal engine is a device which used the energy from a high-temperature source to…

Q: Explain possible reasons of insufficient cooling performance of refrigeration unit.

A: Given:- Possible reasons of insufficient cooling performance of refrigeration unit are:

Q: Calculate the power required by a system of one compressor serving two evaporators. One evaporator…

A: At 10oC ; Saturation Pressure , P = 680.9 kPa Specific Enthalpy , h = 408.6 kJ/kg At 10oC ;…

Q: (iii) The power required to drive the compressor. (iv) The rate of heat rejection to the condenser.

A: Soluion :- Given data :- Cooling capacity = 5 tonnes =5×3.8889 kjsec =…

Q: The Pump Work is the work required to push the water into the boiler at a higher pressure

Q: the net heat input

A: Given data; Current=250 A Voltage,v= 20 V Welding speed,=5 mm/s Arc efficiency=70%=0.7Determine the…

Q: A manufacturing company is intending to use its water cooled condenser for its proposed cold storage…

A: Given, Twaterin=30°C Twaterout=40°C Tcondensation=35°C We know, Energy Balance equation…

Q: The thermal

A: Given: Heat engine recieves heat:Q1=35 KJT1=750CRejects heat to the ambient is:Q2=15 KJT2=280C

Q: mperature of 90°0 The water used 3 kg/s with an inlet temperature of ation for the overall heat…

A: Detail diagram of heat exchanger

Q: A simple solar water heater is shown in the image. Which tubing would give the hottest water from…

Q: B. A vacuum gauge mounted on a condenser reads 0.66 m hg. What is the absC the condenser in KPa when…

A: Hi and thanks for the questions. Since you have asked multiple questions, we will solve the first…

Q: efficiency for ammonia compressor designed with 4 % clearance and operating between condenser and…

A: Solution is attached below

Q: Difference between overfeed and underfeed coal beds used in stem boilers

Q: How does Refrigeration system work?

A: A refrigeration system is defined as the process of cooling a substance to maintain the temperature…

Q: compute mass flow rate of refrigerant

A: The refrigerating effect in tons of refrigeration is, Q˙ref=64 TR The refrigerating effect per unit…

Q: the latent heat represents

A: This question is based on the concept of latent heat of vaporization from thermodynamics.

Q: Mention five major problem that are associated with refrigeration system

A: Given Data : Refrigeration system

Q: Total heat transfer rate

A: 1). first find the reynold's number and determine whether tye flow is laminar or turbulent?? 2).…

Q: the vapor compression refrigeration system, sub c ondenser; D increase the refrigeration cost of the…

A: In the vapor compression refrigeration system, sub cooling in the condenser: Increase the COP of…

Q: Make a comparison between the bath and state functions.

Q: Q3. Explain refrigeration cycle with example

Q: Determine the COP of the heat pump.

A: Given data; An industrial heat pump operates between the temperatures of; T1=270 C…

Q: A refrigerant 22 , four-cylinder, 85 mm x 70 mm compressor operating at 28 rev/sec, condensing temp…

A: Given: To find: a) volumetric efficiency b) compression efficiency

Q: 2. Multiple expansion valves Condenser -3 P 2

A: ME-VCS (multi-evaporator vapour compression systems) are used to cool numerous zones. The…

Q: 8- Compare the values between the hot water with cold water ?

A: Q: 8 Given:

Q: er equipped c heating e lly contains

Q: (COP) of the heat pump is

A: Given data; Temperatures T1>T3>T2Heat pump receives the entire work output (W) of the heat…

Q: The rated boiler horsepower of a fire tube boiler is 500 Hp. What is the heating surface area of the…

Concept explainers

Mechanisms of heat transfer

Heat transfer is an essential discipline in thermal engineering that deals with the transfer, conversion, usability, and creation of heat or thermal energy. Transfer of heat occurs through various mechanisms like conduction, convection, radiation, and change of phases. All these mechanisms have distinct characteristics, but these mechanisms can simultaneously occur in an identical system.

Question

100%

6. An electric hot plate is placed in a room which is maintained at a temperature of 297 K.
The plate is maintained at a temperature of 403 K and has an emissivity of 0.8. If the plate
surface resembles a circular disc of diameter 250 mm, electrical power consumed by the hot
plate will be;
a. 22 W
b. 65 W
c. 75 W
d. 86 W

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step by step

Solved in 2 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 15C, (b) 600C, and (c) 5700C.
1.28 The sun has a radius of and approximates a blackbody with a surface temperature of about 5800 K. Calculate the total rate of radiation from the sun and the emitted radiation flux per square meter of surface area.
Three thin sheets of polished aluminum are placed parallel to each other so that the distance between them is very small compared to the size of the sheets. If one of the outer sheets is at 280C and the other outer sheet is at 60C, calculate the temperature of the intermediate sheet and the net rate of heat flow by radiation. Convection can be ignored.
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 816C and 260C, respectively. Determine the rate of heat transfer by radiation between the plates in W/m2 and the radiative heat transfer coefficient in W/m2K.
11.31 A large slab of steel 0.1 m thick contains a 0.1 -m-di- ameter circular hole whose axis is normal to the surface. Considering the sides of the hole to be black, specify the rate of radiative heat loss from the hole. The plate is at 811 K, and the surroundings are at 300 K.
1.26 Repeat Problem 1.25 but assume that the surface of the storage vessel has an absorbance (equal to the emittance) of 0.1. Then determine the rate of evaporation of the liquid oxygen in kilograms per second and pounds per hour, assuming that convection can be neglected. The heat of vaporization of oxygen at –183°C is .
1.25 A spherical vessel, 0.3 m in diameter, is located in a large room whose walls are at 27°C (see sketch). If the vessel is used to store liquid oxygen at –183°C and both the surface of the storage vessel and the walls of the room are black, calculate the rate of heat transfer by radiation to the liquid oxygen in watts and in Btu/h.
Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip is a cylinder 3 mm in diameter and 10 mm long. The surrounding air temperature is 20C, and the average convection heat transfer coefficient over the tip is 20W/m2K. The tip is highly polished initially, giving it a very low emittance.
1.11 Calculate the heat loss through a glass window 7-mm thick if the inner surface temperature is 20°C and the outer surface temperature is 17°C. Comment on the possible effect of radiation on your answer.
1.47 A flat roof is modeled as a flat plate insulated on the bottom and placed in the sunlight. If the radiant heat that the roof receives from the sun is , the convection heat transfer coefficient between the roof and the air is 12 W/m2 K, and the air temperature is , determine the roof temperature for the following two cases: (a) Radiative heat loss to space is negligible, (b) The roof is black and radiates to space, which is assumed to be a black- body at 0 K.