Heat Transfer Radiation Lab Report
Module : Heat Transfer – Free Convection and Radiation Laboratory
Date : 22nd March 2012
CONTENTS
INTRODUCTION 3
AIMS & OBJECTIVES 3
Objectives 3 To investigate Free Convection and Radiation 3 Theory 3
EXPERIMENT 3
Apparatus Used 3 Procedure 4
RESULTS, CALCULATIONS, OBSERVATIONS & CONCLUSIONS 5
Observations During Tests 5 Table 1 5 Table 2 5
Calculations 6
Calculating Power (Watts) 6 Calculating Heat Transfer Emissivity (Ɛ) 6 Emisssivity of a black body 6 Calculating Q rad 6 Calculating Q rad 6 Calculating Q conv 7 Equation for Free Convection 7 Percentage values calculation 7 Absolute Pressure calculation 7 Graph of Pressure Against Temp Difference 8
Conclusions 8
Conclusion 11 Typical Examples of Heat Transfer 12 References 13
List of Figures, Tables & Graphs 14
Heat Transfer Laboratory Sheet I 14
Heat Transfer – Free Convection and Radiation Laboratory
INTRODUCTION
The purpose of this lab is to understand natural and forced convection on a cylinder by measuring surface and ambient temperatures and relating the data to convection heat transfer equations.
AIMS & OBJECTIVES
Objectives
To investigate Free Convection and Radiation
1. Determine the emissivity (Ɛ) of an element experimentally. 2. Determine the Heat transfer coefficients by free convection
Theory
Natural Convection: Heat transfer through circulation of fluid due solely to gravity
Forced Convection: Heat transfer through circulation of fluid due to forced fluid movement (fan, pump, etc.)
Radiation: Heat transferred by surface photon emission, typically only significant at T>>Room Temp.
EXPERIMENT
Apparatus Used
Figures 1 below shows the vacuum pump vessel and measuring equipment used
The apparatus consisted of a heated element which was suspended inside a [pressure vessel. The air pressure in the vessel was varied by the use of either a bleed valve or
Date : 22nd March 2012
CONTENTS
INTRODUCTION 3
AIMS & OBJECTIVES 3
Objectives 3 To investigate Free Convection and Radiation 3 Theory 3
EXPERIMENT 3
Apparatus Used 3 Procedure 4
RESULTS, CALCULATIONS, OBSERVATIONS & CONCLUSIONS 5
Observations During Tests 5 Table 1 5 Table 2 5
Calculations 6
Calculating Power (Watts) 6 Calculating Heat Transfer Emissivity (Ɛ) 6 Emisssivity of a black body 6 Calculating Q rad 6 Calculating Q rad 6 Calculating Q conv 7 Equation for Free Convection 7 Percentage values calculation 7 Absolute Pressure calculation 7 Graph of Pressure Against Temp Difference 8
Conclusions 8
Conclusion 11 Typical Examples of Heat Transfer 12 References 13
List of Figures, Tables & Graphs 14
Heat Transfer Laboratory Sheet I 14
Heat Transfer – Free Convection and Radiation Laboratory
INTRODUCTION
The purpose of this lab is to understand natural and forced convection on a cylinder by measuring surface and ambient temperatures and relating the data to convection heat transfer equations.
AIMS & OBJECTIVES
Objectives
To investigate Free Convection and Radiation
1. Determine the emissivity (Ɛ) of an element experimentally. 2. Determine the Heat transfer coefficients by free convection
Theory
Natural Convection: Heat transfer through circulation of fluid due solely to gravity
Forced Convection: Heat transfer through circulation of fluid due to forced fluid movement (fan, pump, etc.)
Radiation: Heat transferred by surface photon emission, typically only significant at T>>Room Temp.
EXPERIMENT
Apparatus Used
Figures 1 below shows the vacuum pump vessel and measuring equipment used
The apparatus consisted of a heated element which was suspended inside a [pressure vessel. The air pressure in the vessel was varied by the use of either a bleed valve or
References: Physics Education, 25, 176 - 179 (1990). NO SI 143008); website www.e-prolab.com/comlab/. assessment, Amer. J. Phys., 58 (10), 956 - 960 (1990). SHEFFIELD HALLAM UNIVERSITY FACULTY OF ACES (2009), Process Engineering Lab Sheet. Multi Hole Extrusion Suranaree University of Technology, Last accessed 7th April 2009 at: http://www.sut.ac.th/Engineering/metal/pdf/metform/04_extrusion.pdf