Chapter 5: Insulation: Materials and Techniques
59
CHAPTER 5: INSULATION: MATERIALS AND
TECHNIQUES
An energy efficient building envelope contains both a thermal barrier and an air barrier. The key to an
effective thermal barrier is proper installation of
Proceedings of International Conference on Advances in Mechanical Engineering
May 29-31, 2013, COEP, Pune, Maharashtra, India.
Paper ID ICAME2013 S7/013
STUDY OF ENERGY CONSERVATION IN PRESSURE COOKER
V. S. Manka
Department of Mechanical Engineering,
Coll
Pressure Cooker
Pressure cooking is largely an industrial process but many domestic kitchens also
pressure cook. Thorough analysis of a pressure cooker can be tedious because they
are transient. Usually an open-system is used.
Also, at the beginning of op
White Paper - Thermowell Calculations
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Introduction
Cooking sector - one of the major energy consuming sector
It consumes significant amount of energy
Our Project deals with the heat analysis of domestic pressur
Chapter 11 Fundamentals of Thermal Radiation
Atmospheric and Solar Radiation
11-50C The solar constant represents the rate at which solar energy is incident on a surface normal to sun's rays at the outer edge of the atmosphere when the earth is at its mea
Chapter 11 Fundamentals of Thermal Radiation
Chapter 11 FUNDAMENTALS OF THERMAL RADIATION
Electromagnetic and Thermal Radiation
11-1C Electromagnetic waves are caused by accelerated charges or changing electric currents giving rise to electric and magneti
Chapter 10 Boiling and Condensation Review Problems 10-72 Steam at a saturation temperature of Tsat = 40 C condenses on the outside of a thin horizontal tube. Heat is transferred to the cooling water that enters the tube at 25 C and exits at 35 C. The rat
Chapter 10 Boiling and Condensation
Condensation Heat Transfer
10-34C Condensation is a vapor-to-liquid phase change process. It occurs when the temperature of a vapor is reduced below its saturation temperature Tsat. This is usually done by bringing the
Chapter 10 Boiling and Condensation 10-21 Water is boiled at 1 atm pressure and thus at a saturation (or boiling) temperature of Tsat = 100 C by a horizontal nickel plated copper heating element. The maximum (critical) heat flux and the temperature jump o
Chapter 10 Boiling and Condensation
Chapter 10 BOILING AND CONDENSATION
Boiling Heat Transfer
10-1C Boiling is the liquid-to-vapor phase change process that occurs at a solid-liquid interface when the surface is heated above the saturation temperature of
Chapter 9 Natural Convection 9-103E The components of an electronic device located in a horizontal duct of rectangular cross section is cooled by forced air. The heat transfer from the outer surfaces of the duct by natural convection and the average tempe
Chapter 9 Natural Convection
Review Problems 9-94E A small cylindrical resistor mounted on the lower part of a vertical circuit board. The approximate surface temperature of the resistor is to be determined. Assumptions 1 Steady operating conditions exist
Chapter 9 Natural Convection
Combined Natural and Forced Convection 9-72C In combined natural and forced convection, the natural convection is negligible when Gr / Re2 01 . Otherwise it is not. . 9-73C In assisting or transverse flows, natural convection
Chapter 9 Natural Convection 9-32 A fluid flows through a pipe in calm ambient air. The pipe is heated electrically. The thickness of the insulation needed to reduce the losses by 85% and the money saved during 10-h are to be determined. Assumptions 1 Ste
Chapter 9 Natural Convection
Chapter 9 NATURAL CONVECTION
Physical Mechanisms of Natural Convection 9-1C Natural convection is the mode of heat transfer that occurs between a solid and a fluid which moves under the influence of natural means. Natural conv
Chapter 8 Internal Forced Convection
Review Problems 8-61 Geothermal water is supplied to a city through stainless steel pipes at a specified rate. The electric power consumption and its daily cost are to be determined, and it is to be assessed if the fri
Chapter 8 Internal Forced Convection 8-53 Hot air enters a sheet metal duct located in a basement. The exit temperature of hot air and the rate of heat loss are to be determined. Assumptions 1 Steady flow conditions exist. 2 The inner surfaces of the duct
Chapter 8 Internal Forced Convection
Chapter 8 INTERNAL FORCED CONVECTION
General Flow Analysis 8-1C Liquids are usually transported in circular pipes because pipes with a circular cross-section can withstand large pressure differences between the inside
Chapter 7 External Forced Convection 7-99 Wind is blowing over the roof of a house. The rate of heat transfer through the roof and the cost of this heat loss for 14-h period are to be determined. Assumptions 1 Steady operating conditions exist. 2 The crit
Chapter 7 External Forced Convection Special Topic: Thermal Insulation 7-73C Thermal insulation is a material that is used primarily to provide resistance to heat flow. It differs from other kinds of insulators in that the purpose of an electrical insulat
Chapter 7 External Forced Convection 7-52 A steam pipe is exposed to a light winds in the atmosphere. The amount of heat loss from the steam during a certain period and the money the facility will save a year as a result of insulating the steam pipe are t
Chapter 7 External Forced Convection
Flow Across Cylinders And Spheres 7-35C For the laminar flow, the heat transfer coefficient will be the highest at the stagnation point which corresponds to 0 . In turbulent flow, on the other hand, it will be highest
Chapter 7 External Forced Convection
Chapter 7 EXTERNAL FORCED CONVECTION
Drag Force and Heat Transfer in External Flow 7-1C The velocity of the fluid relative to the immersed solid body sufficiently far away from a body is called the free-stream velocity
Chapter 6 Fundamentals of Convection 6-39 The oil in a journal bearing is considered. The velocity and temperature distributions, the maximum temperature, the rate of heat transfer, and the mechanical power wasted in oil are to be determined. Assumptions
Chapter 6 Fundamentals of Convection
Chapter 6 FUNDAMENTALS OF CONVECTION
Physical Mechanisms of Forced Convection 6-1C In forced convection, the fluid is forced to flow over a surface or in a tube by external means such as a pump or a fan. In natural con
Chapter 5 Numerical Methods in Heat Conduction
Special Topic: Controlling the Numerical Error
5-96C The results obtained using a numerical method differ from the exact results obtained analytically because the results obtained by a numerical method are ap
Chapter 5 Numerical Methods in Heat Conduction 5-84 A uranium plate initially at a uniform temperature is subjected to insulation on one side and convection on the other. The transient finite difference formulation of this problem is to be obtained, and t
Chapter 5 Numerical Methods in Heat Conduction
Transient Heat Conduction
5-63C The formulation of a transient heat conduction problem differs from that of a steady heat conduction problem in that the transient problem involves an additional term that repr
Chapter 5 Numerical Methods in Heat Conduction
Two-Dimensional Steady Heat Conduction
5-43C For a medium in which the finite difference formulation of a general interior node is given in its g node l 2 simplest form as Tleft Ttop Tright Tbottom 4Tnode 0: