Heat - thermodynamics, Mechanical Engineering

Heat:

Sol: Heat can be energy transferred across the boundary of a system because of temperature difference between system and surrounding. The heat is transferred by the processes such as conduction, convection and radiation. The main characteristics of heat are:
1. Heat flows from a system at a higher temperature to a system at a lower temperature.

2. The heat exists only during transfer into or out of system.

3. Heat is positive when it flows into system and negative when it flows out of system.

4. Heat is generally a path function.

5. It is not property of system as it does not represent an exact differential dQ. It is thus represented as Q.

Heat required to raise temperature of a body or system, Q = mc (T2 - T1) Here, m = mass, kg

T1, T2  = Temperatures in °C or K. c = specific heat, kJ/kg-K.

Specific heat for gases is the specific heat at constant pressure (Cp) and constant volume (cv) Also; mc = thermal or heat capacity, kJ.

mc = water equivalent, kg.

 

 

Posted Date: 10/15/2012 1:45:49 AM | Location : United States







Related Discussions:- Heat - thermodynamics, Assignment Help, Ask Question on Heat - thermodynamics, Get Answer, Expert's Help, Heat - thermodynamics Discussions

Write discussion on Heat - thermodynamics
Your posts are moderated
Related Questions
Q. Mechanical design of the blowdown systems? Mechanical design of the blowdown systems shall be sized for a continuous blowdown of a minimum of 1.0% of MCR. Fabricator may re

HOW TO GO ABOUT WRITING A TERM PAPER TITLED: APPLICATION OF TURBULENT FLOW IN MECHANICAL ENGINEERING.

Creation phase of Paver machine: Objective: "To generate alternative methods for providing the function, through creative thinking, brainstorming and even speculation."

Overhead Bridge Crane Figure below shows a jib crane. In this type of crane the hook can move in a circular path. A jib crane is preferred where lifting of the jobs is requ

Design of a Bicycle Frame : Figure  depicts a simple bicycle frame, which is to be built of hollow aluminium tubing with outside diameter of 20 mm and wall thickness of 2 mm. The f

Q. Air-Gas Cross-Limiting and Air-Gas Ratio Control? The Steam Generator firing demand signal is directed to two discrete signal selectors. A low signal selector ensures that

V acuu m (Or Vacuum pressure) (P vacc ): It is pressure of fluid, which is always less than atmospheric pressure. Pressure in a steam condenser is one such examp

Dry Saturated Steam - thermodynamics: A dry saturated steam is single phase medium. It does not have any water particle. It can be obtained on complete evaporation of water at

Plate clutch pressure:  Check plate clutch pressure for any step using a straight edge.

Special Tool: Use special tools wherever applicable. Special tools are designed to dismantle or assemble a specific part or assemblies without causing damage to them. Cleaning