A cubical furnace 0.5m x 0.5m x 0.5m on the inside is constructed of fire brick(k = 1.04W/mK) with awal thickness of 100mm. The temperature drop across the furnace wal si 300\deg C. Calculate the shape factor for the furnace and determine the heat loss by conduction. What change ni hte heat los would occur, if the cubical furnace si replaced by aspherical furnace which has same inside capacity and wal thickness?

A cubical furnace 0.5m x 0.5m x 0.5m on the inside is constructed of fire brick(k = 1.04W/mK) with awal thickness of 100mm. The temperature drop across the furnace wal si 300\deg C. Calculate the shape factor for the furnace and determine the heat loss by conduction. What change ni hte heat los would occur, if the cubical furnace si replaced by aspherical furnace which has same inside capacity and wal thickness?

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.

Chapter3: Transient Heat Conduction

Section: Chapter Questions

Problem 3.36P

See similar textbooks

Similar questions

c) A steel pipe of 100 mm bore, and 10 mm bore thickness, carrying dry saturated steam at 28 bars, is insulated with a 40 mm layer of moulded insulation. This insulation in turn is insulated with a 60 mm layer of felt. The atmospheric temperature is 15 °C. Calculate: (i) the rate of heat loss by the steam per metre pipe length. (ii) the temperature of the outside Dimensions in mm surface.zzzzzzz h₂-15 W/m²K Steel k₁=50 W/mK AVALEHT Ø100 1₂ " Steam 28 bar h-550 W/m²K, Inner heat transfer coefficient = 550 W/m² K Outer heat transfer coefficient = 15 W/m² K Thermal conductivity of steel = 50 W/m K Thermal conductivity of felt = 0.07 W/m K Moulded insulation Felt Moulded insulation K₂=0.09 W/mK Thermal conductivity of moulded insulation = 0.09 W/m 40 10. A 60 15°C Felt K₁=0.07 W/mK zzzzzzzz
An oil storage tank has 20mm steel walls covered with 50mm of fiber glass insulation. if the oil temperature is kept at 150 degree Celsius, what is the rate of heat loss when the outside temperature is 20 degree Celsius and external air coefficient is 20W/m². How much would the heat loss be reduced by doubling the thickness of the insulation?
A hollow tube having an 'inside dia metes of (3m) and a wll thick ness of (0:5mm) isexpased to an enviroment at (h = 100 wht-t) and (Too=40k Whet heat generation nate in the tube will produce tube deuperatar f 250€ for kesowlm.k surface is insulated. a maximum Assume the inner O whet are the kate 7 heat.
Q2- Water flows inside a steel pipe with an ID of 2.5 cm. The wall thickness is 2 mm, and the convection coefficient on the inside is 100 Wm? C. The convection coefficient on the outside is 10 W/n C. The pipe is covered with a layer of asbestos. 1-determine the thickness of the asbestos layer at the critical insulation radius of the pipe. 2-calculate the change percent of heat transfer with and without the insulation. 3-commet on your results,
diamter of 1.5m is at 300x 3° A hot sphere having is buried in a material wnth k=1.2 Wc and the outside surface is Centerline of the Sphere is 3.75 m.Calkulate heat lass. a and at 30°C. The depth of the
To maximize production and minimize pumping costs, crude oil is heated to reduce its viscosity during transportation from a production field. (1) Consider a pipe-in-pipe configuration consisting of concentric steel tubes with an intervening insulating material. The inner tube is used to transport warm crude oil through cold ocean water. The inner steel pipe (k, = 45 W/m-K) has an inside diameter of D₁, 1 = 150 mm and wall thickness t; = 20 mm while the outer steel pipe has an inside diameter of D₁,2 = 250 mm and wall thickness to = 1;. Determine the maximum allowable crude oil temperature to ensure the polyurethane foam insulation (k = 0.055 W/m-K) between the two pipes does not exceed its maximum service temperature of 7p,max = 70°C. The ocean water is at T, = -5°C and provides an external convection heat transfer coefficient of h, = 500 W/m²K. The convection coefficient associated with the flowing crude oil is h; = 450 W/m².K. (2) It is proposed to enhance the performance of the…
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.
A ball made of steel alloy with a diameter of 2 millimeters is first heated to 800 degrees and then suddenly immersed in a water bath to cool down to 100 degrees. The materials from which the ball is made have a thermal conductivity coefficient of 54.94 w / mk, a heat capacity of 7860 kg / m3, a heat capacity of 450 j / kg. Also, the heat transfer coefficient is 41.66 2 / m2. a-)Find the temperature of the ball immersed in water after 10 seconds. b-)Find the time required to cool the ball to 400 degrees.
Can someone please help me with creating an excel spreadsheet to calculate heat transfer phenomenon from a cylindrical fuel rod to the coolant? The excel sheet needs to be able to calculate these 3 things: Heat generated in a fuel rod at a distance ‘r’ from the center; Total Heat generated in the Reactor; the maximum temperature in the fuel and the cladding surface temperature, for a fuel rod at a distance ‘r’ from the center. The fuel used in this will be UO2 and there is a thin layer of helium that will separate the fuel from the cladding material. The user input parameters will be: the thermal neutron flux at the core, thermal conductivity of fuel, thermal conductivity of helium, thermal conductivity of the cladding, thickness of the helium layer, thickness of the cladding, diameter of the fuel pellet, fuel rod location (r), Cylindrical Reactor Size, and the fuel enrichment. For the fluid the user input will be coolant temperature and the heat transfer coefficient.
A hollow tube having and a wall thick ness an 'inside dia metes of (3em) of (05mm) isexpased to an enviroment at (h= 100wh--E) and (Tooz40tWhet heat generation nate in the tube will produce Habe temperatar inner surface 7 heat. a maxeimum the 250€ for kasowlm.k e is insulatid. Assume O whet are hekate the ate
A hollow tube having and a wall thick ness of (0:5mm) isexpased to an enviroment at (h= 100w/h-E) and (Too=40tWhet heat generation nate in the tube will produce an inside diia metes of (3cm) tabe temperatar the inner 250€ for kasowlinik a maximu m surface is insulatid. A heat. Assume O whet are the kate 2 Whet are
A metal rod 1 sq.in in cross section and 6 in long heated at one end and cooled at the other. If the rate of heat input is 3BTU/hr and the difference in the temperature of the two ends is 2oF. Find: a. coefficient of thermal conductivity, W/m-K.