PRODUCT LOAD ACTIVITY 3 8.) A supply of 50 kg of chicken at 6 C contained in a box is to be frozen to -18 C in a freezer(Figure). Determine the amount of heat that needs to be removed. The container box is 1.5 kg,and the specific heat of the box material is 1.4 kJ/kg • K.m=50kgh=247 kJ/kgChickenm= 50 kgT =6°CT;=-18°CTireezing =-2.8°CCa=3.32 kJ/kg.KC3=1.77 kJ/kg.KContainer=1.5 kgCbox=1.4 kJ/kg.K

Given Mass, m = 50 kg Temperature, T1 = 6oC T2 = -18oC Specific…

3.) A supply of 50 kg of chicken at 6 C contained in a box is to be frozen to -18 C in a freezer Figure). Determine the amount of heat that needs to be removed. The container box is 1.5 kg, nd the specific heat of the box material is 1.4 kJ/kg • K.

3.) A supply of 50 kg of chicken at 6 C contained in a box is to be frozen to -18 C in a freezer Figure). Determine the amount of heat that needs to be removed. The container box is 1.5 kg, nd the specific heat of the box material is 1.4 kJ/kg • K.

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 1.82P: Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle...

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Discuss the modes of heat transfer that determine the equilibrium temperature of the space shuttle Endeavour when it is in orbit. What happens when it reenters the earths atmosphere?
8.) A supply of 50 kg of chicken at 6 C contained in a box is to be frozen to -18 C in a freezer (Figure). Determine the amount of heat that needs to be removed. The container box is 1.5 kg, and the specific heat of the box material is 1.4 kJ/kg • K. mc=50kg h=247 kJ/kg Chicken m= 50 kg T=6°C T=-18°C Tfreezing=-2.8°C Ca=3.32 kJ/kg.K Ch=1.77 kJ/kg.K Container=1.5 kg Cbox=1.4 kJ/kg.K
The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. Illustrate the order of arrangement of bricks A and B in the furnace wall (with thickness, estimated temperatures at the interface between walls A and B and at the interior and exterior surface, the transport area and direction of transfer included)
The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. If a 15 ft2 wall is to be constructed, how many bricks will be used? how many brick A and how many brick B?
The inside wall of a furnace is at 2100oF and the outside wall is at 300oF. The wall of a furnace must be designed to transmit no more than 220 Btu/hr-ft2. Two types of bricks are available for construction:TYPE A: k = 0.38 Btu/ hr-ft-R with an allowable maximum temperature of 1400oFTYPE B: k = 0.98 Btu/ hr-ft-R with an allowable maximum temperature of 2300oF Both types of bricks have the same dimensions (9” x 4.5” x 3”) but the cost for Type B brick is twice the cost of Type A brick. What is the rate of heat conduction through wall A? If a 15 ft2 wall is to be constructed, how many bricks will be used? how many brick A and how many brick B?
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2-1. Temperature Response in Cooling a Wire. A small copper wire with a diameter of 0.792 mm and initially at 366.5 K is suddenly immersed in a liquid held constant at 311 K. The convection coefficient h 85.2 W/m K. The physical properties can be assumed constant and are k =374 W/m K, c, = 0.389 kJ/kg K, and p = 8890 kg/m2. (a) Determine the time in seconds for the average temperature of the wire to drop to 338.8 K (one-half the initial temperature difference). (b) Do the same but for h 11.36 W/m2 K (c) For part (b), calculate the total amount of heat removed for a wire 1.0 m р u (A long. (a) t 5.66 s Ans. the Smou hire is lons asbume Nhere rraolius , here radlius yinder hitu x Chapter 14 Principles of Unsteady-State Heat Transfer
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