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You've experienced convection cooling if you've ever extended your hand out the window of a moving vehicle or into a flowing water stream. With the surface of your hand at a temperature of
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Chapter 1 Solutions
Introduction to Heat Transfer
- The heat transfer rate from hot air by convection at 100C flowing over one side of a flat plate with dimensions 0.1m0.5m is determined to be 125 W when the surface of the plate is kept at 30C. What is the average convection heat transfer coefficient between the plate and the air?arrow_forwardDetermine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.arrow_forwardThe air-conditioning system in a Chevrolet van for use in desert climates is to be sized. The system is to maintain an interior temperature of 20C when the van travels at 100 km/h through dry air at 30C at night. If the top of the van is idealized as a flat plate 6 m long and 2 m wide and the sides as flat plates 3 m tall and 6 m long, estimate the rate at which heat must be removed from the interior to maintain the specifiedarrow_forward
- 3.16 A large, 2.54-cm.-thick copper plate is placed between two air streams. The heat transfer coefficient on one side is and on the other side is . If the temperature of both streams is suddenly changed from 38°C to 93°C, determine how long it takes for the copper plate to reach a temperature of 82°C.arrow_forwardUsing Table 1.4 as a guide, prepare a similar table showing the orders of magnitude of the thermal resistances of a unit area for convection between a surface and various fluids.arrow_forwardYou are cooling the door to a large heat-treating oven, which is 3.50 m tall by 1.30 m wide, with a large fan blowing air at 25.0°C over the outside of the door. The convection coefficient associated with this cooling process is h = 57.0 W/(m2-K). The outside surface temperature of the door is 58.0°C. Find the heat transfer rate q, in units of Watts, associated with this cooling process.arrow_forward
- A spherical ball with a diameter of 5 cm is suspended in the middle of a room with a temperature of 20°C. The temperature of the ball is 70°C. The heat transfer coefficient of the ball is 15 W/(m2.°C) and the emissivity of the ball surface is 0.8.What is the total heat transfer rate from the ball to the air assuming both temperatures are constant? Heat conduction through the suspension system can be neglected.arrow_forwardConvection. A thin 100 cm long and 10 cm wide horizontal plate is placed in a large tank full of water at 60°C. At what uniform temperature, in °C, should be maintained in the plate if the rate of heat supplied to the plate is 2 kW as heat is dissipated from either side? The convection heat transfer coefficient at the lower side is h, = 384.5 W/m²K and h,= 3215.5 W/m²K at the upper side.arrow_forward1. PLEASE ANSWER ASAParrow_forward
- Ground turkey was made into me at balls and refrigerated at 2 ° C before being deep fried. The diameter of each meat ball is 9cm. To make sure that the meat balls are safe to be consumed, they must be cooked over 70 ° C. Assume that the cooking oil is at a constant temperature of 180 ° C and has a heat transfer coefficient of 50 W/(m 2 ∙ K). The conductivity and specific heat of the ground turkey are approximated at 2 W/( m∙K ) and 4 kJ/( kg ∙ K) respectively. The density of the ground turkey is 500kg/ m 3 . a) During the deep- frying process, do you anticipate that each meat ball has a uniform temperature distribution throughout its volume? Please show calculation to support your answer (5 pts) . b) Please calculate the minimum time required for cooking (1 5 p ts). c) When served, what are the surface and center temperatures of each meat ball ( 15 pts).arrow_forwardA flat aluminum plate 8 m long and 1.5 m wide has a surface temperature of 180°C. For its cooling, air at 1 atm and speed of 10 m/s circulates at 20°C parallel to the length of the plate.a) Determine the rate of heat transfer by convection in steady state. b) In order to increase the heat dissipation from the plate, the engineers considered placing rectangular fins of the same material (Kaluminium = 200 W/m.K). The fins are 50 mm long and 0.5 mm thick and the placement density is 75 fins per unit length of the plate (the fins are equally spaced and span the entire width of the plate). The convective coefficient of the air over the plate resulting from the placement of fins is 10 W/m².K. Determine the heat transfer rate and percentage increase over part (a).arrow_forwardA spherical pellet (ρ =1000 kg/m3 , c = 1000 J/(kg⋅K)) with a radius ro = 1 cm is cooled from an initial temperature of 200°C by immersion in water bath at 10°C with a convection coefficient h = 100 W/(m2 K). Evaluate the temperature in the center and on the surface of the pellet after 10 s of immersion for two cases: (a) Thermal conductivity of the pellet k = 0.1 W/(m⋅K) (b) Thermal conductivity of the pellet k = 5 W/(m⋅K)arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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