One of the advantages ofusing non-concentratingtype of solar collectorishigher maintenancecostO rate of heat loss iscomparatively highuses global radiationcomplicated design

Uses global radiation is the correct Answer.

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Engineering

Mechanical Engineering

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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.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.53P: Determine the power requirement of a soldering iron in which the tip is maintained at 400C. The tip...

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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.
1.25 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.
The outside design temperatures in the summer inTucson, Arizona, for 2.5% of the time are _________ °Fdry-bulb and ___________ °F wet-bulb.
Using a polynomial equation solver, determine the steady-state surface temperature (Ts) of the passive radiative cooler below that is exposed to a windy convective enviroment h=40 W/m2*K and T∞= 25°C. The surrounding atmosphere is fixed at Tsur= 10°C. Set up the energy balance/conservation equation.
Sipho’s mother is making a fire in the stove inside a shack using coal. A fan is used to extract the flue gasfrom the fire via a chimney made of zinc material. The wall thickness of Chimney is L=4mm and the walltemperature of the chimney on the flue gas side is T_si=60˚C. Sipho, playing outside next to the chimneyexperiences an ambient temperature of 20˚C. The surrounding temperature is T_sur=35˚C and the emissivityis ε=0.95. Assume the convection coefficient is 20W/m2K and the chimney is grey material.Under these conditions determine the outer surface (air side) temperature T_so=? of the chimney.
40% of incident radiant energy on the surface of thermally transparent body is reflected back, if the transmissivity of the body be 0.15 then emissivity of the surface is–
Estimate how much collector area and storage capacity would be required for an active solar hot-water system designed to supply the total needs for two four-person families, one living in Manchester, New Hampshire, where the latitude is 44+°N, and the other in Albuquerque, New Mexico, at 35+°N. The heat capacity of water is about 4,200 J/kg°C, and the hot-water supply temperature in both houses is 75°C (140°F). State and justify all additional assumptions made.
A spherical vessel with inner diameter of 1m (1.1m outside diameter) contains exothermic reaction that generates heat at a volumetric rate of 57 kW/m3. Assuming that the vessel is exposed in a surrounding at a uniform temperature of 278K, that the vessel radiates uniformly. What is the outer surface temperature of the vessel (Ts)? Note: Consider radiation heat tranfer only and the usrface emmissivity is 0.78. Round your answer to 2 decimal places.
How to Solve this, A stainless steel plate at 100◦C faces a firebrick wall at 500◦C.Esti- mate the heat flux and radiation heat transfer coefficient, h
A homeowner in Allentown, PA installs a 60° south-facing solar collectorthat (on the average over the year) replaces 1 kW of electric heat (purchased from thepublic utility at $0.11 per kWh). The homeowner is considering adding a trackingmechanism to maintain perpendicular alignment of the collector with the solar insolation.If the payback period for the upgrade is expected to be five years, what should thehomeowner be willing to pay for the tracking device?
Radiators are used in most of the houses’ heating. If we happen to place a sofa justin front of our heating radiator, how will the heating of the room be affected? Explain.
A man is working in a chamber enclosed with black walls. If the air around the worker is at 20oC, the walls are at 100oC, and the heat transfer coefficient between the worker and the air is 15 W/m2-oC, what temperature will the worker feel? Assume the radiation emissivity of the worker’s cloth is about 0.8.