Transient cooling What heat transfer mechanisms are being ignored, at least as possibilites, and where would they occur?
Q: An air at state point 1 (50°C dry bulb temperature and 25°C wet bulb temperatu experiences a…
A: Evaporating Cooling
Q: Earlier experiments have shown that a certain component cools in air according to Newton's cooling…
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Q: Calculate the heat and work requirements, AU, and AH of the air of each path. The following heat…
A: Given that: At initial state P = 100 kPa, T = 298.15 K At final state P = 500 kPa, T = 298.15 K…
Q: Two types of heating profiles in thermal processing are ________ and
A: In case of thermal processing of food mainly two types of heating profiles are present.
Q: A countercurrent tunnel dryer was used to dry the ape slices from an initial moisture content of 70%…
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Q: 13- In a drying process, the moisture content of 25 kg of food will be reduced from 88% to 8%. The…
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Q: A steel plate with a thickness of 11 cm is placed in a heat treatment furnace at a temperature of…
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Q: Heat transfer to and from a reaction flask is often a critical factor in controlling reaction rate.…
A: The difference between the bath temperature and the temperature within the flask, ∆T, determines the…
Q: 11- A south wall group D at (32 oN, Kw = 0.65). Th %3D room temperature is (24 oC). The maximum…
A: Given:kw=0.65T∞=24o CTo=42o C∆T=12o C
Q: A dancing hall is to be maintained at a temperature of 27°C dry bulb and 20°C wet bulb temperatures.…
A: Given that , Dry bulb temperature = 27 °CWet bulb temperature = 20 °C heat loadQs = 130 kW…
Q: Trasient Cooling What are some of the factors and assumptions that would casue a different between…
A: The heat transfer coefficient is the heat exchanged per unit range per kelvin. Hence the area is…
Q: a) What regions show the largest oceanic latent heat loss? b) What regions show the saltiest…
A: given; a) What regions show the largest oceanic latent heat loss? b) What regions show the saltiest…
Q: Q3/Condensing steam at 1 atm is used to maintain a vertical plate 20 cm high and 3.0 m wide at a…
A: Given DataT∞=100°CTw=20°CH=20cm=0.2mW=3m
Q: In a drying process, the moisture content of 35 kg of food will be reduced from 82% to 6%. The air…
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Q: Wet material, containing 215% moisture (dry basis) is to be dried at the rate of 1.5 kg/sec in a…
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Q: A large piece of biological tissue has to be kept at a temperature as low as possible without…
A: Given Information:Freezing temperature of water Tw=273 KMolecular weight of water Mw= 18Latent heat…
Q: Problem I: Determine the amount of heat removed from 1.5 kg of bologna (sausage) when cooled from…
A: Problem 1 Mass m=1.5 kgMoisture content =59%Fat=22%As it won't be frozen so oil content in…
Q: (B) Cylindrical Water cans (diameter 6.5cm and length 15cm) are to be cooled from initial…
A: Introduction: Convection is the transmission of heat energy between a stationary surface and a…
Q: 200 kg of pork is to be cooled from 20 to 5 C, then frozen and cooled to -20 C. The moisture content…
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Q: Steel balls (diamęter 21 mm, p=7833 kg/m, k 54 W/m-°C, Cp= 0.465 kJ/kg-°C ɑ = 1.474x10 m /s) are…
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Q: In a drying process, the moisture content of 35 kg of food will be reduced from 82% to 6%. The air…
A:
Q: DISCUSSION/CONCLUSION (Present your findings and discuss the results of the experiment) Guide…
A: The values of h1, k1,h2 and L1 are not specifie in the question so iam solving question with…
Q: Juice in cans 150 mm long and 60 mm in diameter is initially at 27°C and is to be cooled by…
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Q: It is cooled by passing air over the glass plate at 600°C. The heat transfer coefficient is 5 W/…
A: Given data: h=5 W/m2·KdTdx=-15°C/mm=-15000 °C/mk=1.4 W/m·Kε=0.8TS=600°C Need to determine the lowest…
Q: Steel balls (diameter 21 mm, p 7833 kg/m', k 54 W/m:°C, Cp 0.465 kJ/kg.°C, and a = 1.474x10 m/s) are…
A: We will use lumped parameter analysis for this problem critical length Lc = Volume / area =Diameter…
Q: A liquid flows inside a 3-cm diameter pipe, 5 meters long with an entering temperature of 350 °C.…
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Q: 7.In the following, which one cannot enhance the convection heat transfer? ( )
A: Option (A) Replacing forced convection by natural convection. Is correct option
Q: Example 22.2. A thin slab of meat is to be cooled from 34°C to a temperature of 5°C with the help of…
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Q: 19 mm diameter steel balls are quenched by heating to 989 K followed by slow cooling to 400 K in an…
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Q: A well-built, wood-framed, single-family detached residence in Manila, Philippines, has a 15 ft by…
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Q: Transient cooling, What is the thermal length and why is it considered important in the transient…
A: given; What is the thermal length and why is it considered important in the transient cooling…
Q: The global average sensible heat flux is 17 W/m2. Use the following information to estimate the…
A: GivenSHF=17 W/m2Q=520×1012 m3/yrLHV=2.5×103 kJ/kg=2.5×106 J/kg R=6400km
Q: Steel balls 12 mm in diameter are annealed by heating to 1100 K and then slowly cooling to 360 K in…
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Q: 7.) 200 kg of pork is to be cooled from 20 to 5 C, then frozen and cooled to -20 C. The moisture…
A: Given: m = 200 kg L = 236.175 kJ/kg Cp1 = 3.5 kJ/kgK Cp2 = 1.7 kJ/kgK
Q: HEAT AND MASS TRANSFER ISSUES. 1- How is the global heat transfer coefficient calculated for the…
A: We are suppose to solve only one question. Please post other question as a separate question.
Q: Activity 1. What are the mechanisms of heat transfer? How are they distinguished from each other?
A: There are three mechanism of heat transfer which are Conduction Convection Radiation
Q: xplain the cooling effect of evaporation in terms of latent heat of evaporation.
A: To explain the cooling effect of evaporation in terms of latent heat of evaporation.
Q: A logging firm in Isabela operates a diesel electric plant to supply its electrical energy…
A: Given data, Mass flow rate of fuel is m˙f=250 gallons/24 hrm˙f=25024×0.85×3.78m˙f=33.47 kg/hr here,…
Q: Why are the transient temperature charts prepared using nondimensionalized quantities such as the…
A: The transient temperature charts depend on the following variables.
Q: A 12-by-12 inches ingot iron casting 60-in high is stripped from its mold while its temperature is…
A: Given: The area of ingot, A = 12 in x 12 in The height of ingot, h = 60 in The temperature of ingot,…
Q: idence in Manila, Philippines, has a room with south-facing fixed windows with draperies. The fixed…
A: given:area A=100ft2
Q: et material, containing 215% moisture (dry basis) is to be dried at the rate of 1.5 kg/sec in a…
A: Given:Temperature of air in drying medium=373 KPartial pressure of water vapor=1.4 kPaTemperature of…
Q: Compute the amount of cooling water required to chill 300 kg of pineapple from 23.0C to 9.00C.…
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Q: How could updrafts and downdrafts contribute to cloud droplet or ice crystal growth?
A: During the updraft the adiabatic cooling of the air takes place and moist air releases the latent…
Q: (B) Cylindrical Water cans (diameter 6.5cm and length 15cm) are to be cooled from initial…
A: Answer: The initial rate of cooling of the cylindrical water can: ◆ Horizontal orientation: 3.06227…
Transient cooling
What heat transfer
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- a) A turbine blade 6 cm long and having a cross sectional area 4.65 cm and perimeter 12 cm is made of stainless steel (k=23.3 Wim K). The temperature at the root is 500 C. The blade is exposed to a hot gas at 870 °C. The heat transfer coefficient between the blade surface and gas is 442 W/im K. Determine the temperature distribution and rate of beat flow at the root of the blade, Assume the tip of the blade to be insulated. b) The hot combustion gases of a fumace are separated from the ambient air and its surounding, which are at 20°C, by a brick wall 0.5 m thick. The brick has a themal conductivity of 5 W/mk and a surface emissivity of 0.6. Under steady-state conditions an Page no.1 of 1 outer surface temperature of 120°C is measured Free convection heat transter to the air adjoining the surface is characterized by a convection coefficient of 15 Wim K What is the brick inner surface temperatureSteel balls (diameter = 21 mm, p = 7833 kg/m , k = 54 W/m•°C, Cp = 0.465 kJ/kg.°C, and a = 1.474x10 m /s) are annealed by heating them first to 870°C in a furnace and then allowing them to cool slowly to 85°C in ambient air at 27°C. What is the total rate of heat %3D transfer from the balls to the ambient air, when 2367 balls are to be annealed per hour (kW)? Select one: A. 11.15 B. 9.12 C. 9.85 D. 8.38 E. 10.50HEAT TRANSFER(a) With the aid of an example, explain the principle behind natural convective heat transfer.
- Sample Problem • Four metric tons of pork are to be stored at a temperature of -12°C in 8 hours. The product enters the chiller at a temperature of 21°C and the specific heats above and below freezing are 0.86 kCal/kg-°C and 0.51 kcal/kg-°C, respectively, and its latent heat of fusion is 48 kCal/kg. If the freezing temperature of the product is -5°C, determine the product load in kCal/hr. TCLQu: Ball bearing ro-4 mm leaving the oven at a uniform temperature of 900 °C ar exposed to air for a while before they are dropped in to the water for quenching Determine the time they can stand the air before their temperature falls below 850 also find the total rate of heat transfer .Take for the balls k 54 W/m .°C , p= 783 kg/m', C,-0.456 kJ/kg.°C %3D Ans : 163 s , 543 W Furmace2-D: A fin may be manufactured as an integral part of a surface by using a casting or extrusion process, or it may be separately brazed or adhered to the surface. From thermal considerations, which option is preferred? 2-E: What is the difference between steady-state and transient heat transfer processes? Give an example for each of them. 2-F: What is the physical interpretation of the Biot number? 2-G: For flow over a flat plate, sketch variation of local convective heat transfer coefficient, h(x), versus the distance along the plate x for laminar, transition, and turbulent flow regimes.
- It has been suggested that a heat engine could be developedthat made use of the temperature difference between waterat the surface of the ocean and water several hundredmeters deep. In the tropics, the temperatures may be 27°Cand 4°C, respectively. (a) What is the maximum efficiencysuch an engine could have? (b) Why might such an enginebe feasible in spite of the low efficiency? (c) Can you imagineany adverse environmental effects that might occur?A vertical furnace wall is made-up on an inner wall of firebrick 20 cm thick followed by insulating brick 15 cm thick and an outer wall of steel 1 cm thick. The surface temperature of the wall adjacent to the combustion chamber is 1200oC while that of the outer surface of steel is 50oC. The thermal conductivities of the wall material in W/m-K are firebrick, 10; insulating brick, 0.26; and steel, 45; neglecting film resistances and contact resistance of joints, determine the percent of the total maintenance due to insulating brick.A spherical container having an outer radius r2 and inner radius r1 (with thermal conductivity, k) is filled with radioactive material generating constant heat at a rate of qdot. Fluid flows across the container at Tinfinity and convection coefficient h. Obtain a relation for the variation of temperature through the spherical container assuming steady state.