Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN: 9781305387102
Author: Kreith, Frank; Manglik, Raj M.
Publisher: Cengage Learning
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Describe what happens to the system inside of a refrigerator or freezer in terms of heat transfer, work, and conservation of energy. Confine yourself to time periods in which the door is closed.
SANAE IV, a research station of The South African National Antarctic Programme (SANAP), is located on Vesleskarvet, Queen Maud Land. It uses an underground lake as the cold reservoir of a Carnot heat pump that maintains the temperature of a science lab at 307.8 K. To deposit 17360 J of heat in the lab, the heat pump requires 1086 J of work. Determine the temperature of water in the underground lake, in Kelvin.
Difference between thermodynamics and heat transfer
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- Q1. A 1200-Wiron is left on the ironing board with its base exposed to the air (Figure 1). About 90 percent of the heat generated in the iron is dissipated through its base whose surface area is 150 cm?, and the remaining 10 percent through other surfaces. Assuming the heat transfer from the surface to be uniform determine (a) the amount of heat the iron dissipates during a 1- hour period, in kWh and (b) the total cost of the electrical energy consumed during this 1-hour period. Take the unit cost of electricity to be $0.07/kWh. Iron 1200 W Figure 1arrow_forwardAir must be compressed in a well-insulated piston cylinder from a volume of 6.4 litres to a volume of 1 litres. If the air is initially at 398 K, what is the minimum work per unit mass of air required to carry out this compression? Give your answer in k) to the nearest whole number. For air: Co = 1.005 kj/kg K and cy= 0.718 kj/kg K.arrow_forwardIn adiabatic process, the system has Q=max. value O W=0 O Q=0 O U-0 O * A vertical piston-cylinder device contains water and is being heated on top of a range. During the process, 65 Btu of heat is transferred to the water, and heat losses from the side walls amount to 8 Btu. The piston rises as a result of evaporation, and 5 Btu of work is done by the vapor. Determine the change in the energy of the water .for this process 61 Btu O 52 Btu 55 Btu 60 Btu * hp compressor in a facility that operates at full load-75 for 2500 h a year is powered by an electric motor that has an efficiency of 93 percent. If the unit cost of electricity is $0.11/kWh, the annual electricity cost of this :compressor is 16,540 $ 19,180 $ O 5,380 $ O 14,300 $ O barometric pressure or 1 atmospheric 1 pressure is equal to 1.019 kgf/cm2 1 kgf/cm2 0.9 kgf/cm2 0 kgf/cm2 Oarrow_forward
- This question related to thermodynamicsarrow_forwardIf H is the work output of a heat engine and Q is the total heat input of an engine, then determine its thermal efficiency.arrow_forwardEnergy transfer in mechanical systems During steady-state operation, a mechanical gearbox receives 70 KW of input power through the input shaft and delivers power through the output shaft. Considering the gearbox as a thermodynamic system, the rate of convection heat transfer generated during its operation is defined by: Q = −hА(T₂ — Tƒ) where h=0.171 kW/m²-K is the convection heat transfer coefficient, A = 1.0 m² is the outer surface area of the gearbox, Tb = 300 K is the temperature of the outer surface, and Tƒ= 293 K is the temperature of the surrounding air. For the gearbox, evaluate the heat transfer rate, Q, and the power delivered through the output shaft, W.arrow_forward
- In a closed rigid (unchangeable, rigid) tank, 0.5 kg of air is present at a temperature of 300 K. There is a heat transfer of 54 kJ from the environment to the tank. The final temperature of the air in the tank is calculated in k.arrow_forwardQ1: An aluminum pan whose thermal conductivity is 237 W/m-°C has a flat bottom whose diameter is 20 cm and thickness 0.6 cm. Heat is transferred steadily to boiling water in the pan through its bottom at a rate of 700 W. If the inner surface of the bottom of the pan is 105°C, determine the temperature of the outer surface of the bottom of the pan.arrow_forwardBased on the concept of heat transfer, explain the followings: i. How can the mountain be much colder than the sea level? ii. How does our sweat control the body temperature? iii. Why is most ofaircraft is painted in white? iv. How the microwave can heat the meal? V. How does the global warming happen?arrow_forward
- A firearm can be modeled as a kind of heat engine, where the projectile acts as a piston that separates from the rest of the system during expansion. Consider a rifle with a 1.70 kg barrel made of iron [specific heat = 448 J/(kg °C)]. The rifle fires a 4.00 g bullet that exits the barrel with a speed of 350 m/s. When the propellant is ignited, 1.10% of the energy released goes into propelling the bullet (this is the thermal efficiency of the "engine"). The other 98.9% can be approximated as being entirely absorbed by the barrel, which increases in temperature uniformly for a short time before this energy is dissipated into the surroundings. What is this temperature increase (in °C)? (Round your answer to at least one decimal place.) °℃arrow_forwardAn insulated cylinder fitted with a movable piston to maintain constant pressure initially contains 100 g of ice at -10 C. Heat is supplied to the contents at a constant rate by a 100 W heater. Make a graph showing temperature of the cylinder contents as a function of time starting at t = 0, when the temperature is -10 C and ending when the temperature is 110 C. Let c = 2.0 kJ/kg Kfor specific heat of ice from -10 to 0 C and of the steam from 100 to 110 C. The specific heat of water between 0 C and 100 C is c = 4.18 X 103 J/kg K. The value of Lv = 2257 X 103 J/ kg and Lf = 333.5 X 103 J/kg.arrow_forwardThe internal and external surfaces of a brick wall, 5m x 6m, 30 cm thick and with a thermal conductivity of 0.69 W/m·°C, are kept at temperatures of 20°C and 5°C, respectively. Calculate the rate of heat transfer through the wall (Figure 2), in W. find thermodynamic system borders and surroundingsarrow_forward
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Heat Transfer – Conduction, Convection and Radiation; Author: NG Science;https://www.youtube.com/watch?v=Me60Ti0E_rY;License: Standard youtube license