Preview

Heat Transfer Notes

Satisfactory Essays
Open Document
Open Document
425 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Heat Transfer Notes
Eb= blackbody emisibibility
= σT 4
T in K units W/m^2
E= εσT 4 qemit =EA Watts energy emitted recognize the direction qnet
Eᵬ= W/m^2 M
Radiation Amount of energy emitted from green color
10 nm 450 nm ~470 nm ∞

Eb ∫ Eᵬ, b ^dᵬ
0


E= ∫ ƐE ᵬ, b d ᵬ
0




0

2

E= ∫ ƐE ᵬ, b d ᵬ ∫ ƐE ᵬ, b d ᵬ

G Gij

⍴ ᵭ+ᵬ=1 Ɛ= Erad/ ( σT 4 ) Blackbody surface
Jb=Eb

Ji= ƐiσT 4 + ∑

Geometrical alpha = epsilon
Radiosity

black body surface ji­­­­­­­~~~­­­­ji Ji=Ebi Net work surface 1 node potential on )
Eb1
Eb2 eb3 connect the dots with resistors 1/A1F12
Eb1 to Eb2 net work surface 1 q1 on EB1 flows into q12 and q13 parallel q1=q12+q13 q1=energy flow from 1 to 2 and 1 to 3

three major parts outline Radiation arbitrary surface Gfi reflection pGji ƐalphaGji given part of the problem find the rest

alpha = Ɛ when exists qnet, rad =? energy conservation at steady state relationship between terms calculation problems
View factor Calculations F14=a
F12, F13, F21, F41 ect Fij sigma Fij=1
AiFij=AjFji

Fi­ l +m = Fil + Fim Ji Gij qij

i, Ji, Ai

qij=(Ji­Jj)/(1/AiFij) blackbody
Ji=Ei(T)

function of temperature Radiation network to find flux or potential 40 to 50 % ison radiation Heat exchanger
U fouling factor will increase the resistance of heat transfer. how to include into the overall equation (mcp)h Th, in Tc, out
(mcp)c Tc,in You want to know the cooling effect energy conservation Q= {mcp(Th,i­Th,o)}h
={mcp(Tc,o­Tc,i) }c Delta Tlm log mean difference Q=UA DTcm Q=HA Dt

A=Q/(U delta T) 2pirL Delta Tlm’= DeltaTlm*F
NTU
effectiveness
Ɛ­NTUmethod
Ɛ=?(Q/Qmax) NTU= UA/mcpmin qmax/Qmax design the amount of heat exchange required for a problem eplison is known NTU =UA/ mcpmin Length of a pipe thermal analysis NTU ­> eplison

You May Also Find These Documents Helpful

  • Good Essays

    4. Use the equation: q = m(SH)ΔT to solve for the amount of heat gained by the…

    • 1515 Words
    • 7 Pages
    Good Essays
  • Good Essays

    F331 Revision

    • 1350 Words
    • 8 Pages

    iii. The electromagnetic radiation absorbed by each atom has a definite frequency related to the difference in energy levels by ∆E = hv…

    • 1350 Words
    • 8 Pages
    Good Essays
  • Good Essays

    Cold Pack Essay

    • 377 Words
    • 2 Pages

    The heat that is absorbed (qsoln) should be equal but the opposite sign to the heat lost by the calorimeter (qcal¬), which is shown in the equation…

    • 377 Words
    • 2 Pages
    Good Essays
  • Good Essays

    Draw the energy-level diagram and write the electronic configuration for zirconium (element 40). (3 marks)…

    • 419 Words
    • 2 Pages
    Good Essays
  • Powerful Essays

    CHM1311 lab

    • 2683 Words
    • 12 Pages

    The formula above is used to determine the specific heat capacity (c). M represents mass and ΔT represents the change in temperature. The heat lost by the metal when placed in cold water is gained by the water. Thus, the heat gain of water must equal the heat loss of the metal.…

    • 2683 Words
    • 12 Pages
    Powerful Essays
  • Satisfactory Essays

    |Initial temperature, t1 |22.5(C ± 0.1(C |22.3( C ± 0.1(C |21.9(C ± 0.1(C |21.8( C ± 0.1(C |…

    • 1231 Words
    • 5 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Heat, also called thermal energy, can be transmitted through space (radiation), by moving fluids (convection), or through direct contact. This final method, called conduction, is explored in the Heat Transfer by Conduction Gizmo™.…

    • 837 Words
    • 4 Pages
    Satisfactory Essays
  • Satisfactory Essays

    nonof

    • 1595 Words
    • 7 Pages

    EE 3CL4, §9 1 / 30 Tim Davidson Frequency Domain Approach to Compensator Design Lead Compensators Lag Compensators EE3CL4: Introduction to Linear Control Systems Section 9: Design of Lead and Lag Compensators using Frequency Domain Techniques Tim Davidson McMaster University Winter 2013 EE 3CL4, §9 2 / 30 Outline Tim Davidson Frequency Domain Approach to Compensator Design Lead Compensators 1 Frequency Domain Approach to Compensator Design Lag Compensators 2 Lead Compensators 3 Lag Compensators EE 3CL4, §9 4 / 30 Frequency domain analysis Tim Davidson Frequency Domain Approach to Compensator Design Lead Compensators Lag Compensators • Analyze closed loop using open loop transfer function • • • • • L(s) = Gc (s)G(s)H(s). Nyquist’s stability criterion 1 Gain margin: |L(jωx )| , where ωx is the frequency at which ∠L(jω) reaches −180◦ Phase margin, φpm : 180◦ + ∠L(jωc ), where ωc is the frequency at which |L(jω)| equals 1 Damping ratio: φpm = f (ζ)…

    • 1595 Words
    • 7 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Chemistry Notes

    • 576 Words
    • 3 Pages

    Chapter 6 practice MULTIPLE CHOICE 1. The formula for acetic acid, CH3CO2H, is an example of a(n) a.|condensed formula.| b.|mathematical formula.| c.|structural formula.| d.|molecular formula.| ANS: A OBJ: Goal #3.1: Interpret, predict, and write formulas for ionic and molecular compounds 3. Which of the following statements are correct?…

    • 576 Words
    • 3 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Specific Heat: The specific heat is the amount of heat per unit mass required to raise the…

    • 337 Words
    • 2 Pages
    Satisfactory Essays
  • Better Essays

    where δQ is the amount of energy the system gains by heating, T is the temperature of the system, and dS is the change in entropy. The equal sign will hold for a reversible process. For a reversible isentropic process, there is no transfer of heat energy and therefore the process is also adiabatic. For an irreversible process, the entropy will increase. Hence removal of heat from the system (cooling) is necessary to maintain a constant internal entropy for an irreversible process in order to make it isentropic. Thus an irreversible isentropic process is not adiabatic. For reversible processes, an isentropic transformation is carried out by thermally "insulating" the system from its surroundings. Temperature is the thermodynamic conjugate variable to entropy, thus the conjugate process would be an isothermal process in which the system is thermally "connected" to a constant-temperature heat bath.…

    • 907 Words
    • 4 Pages
    Better Essays
  • Good Essays

    This experiment was conducted twice firstly with a 1kg aluminium block and then exactly the same procedure was carried out using a 1kg copper block, both blocks have a hole in the centre to insert the heating element and another hole to insert the thermometer.…

    • 953 Words
    • 4 Pages
    Good Essays
  • Satisfactory Essays

    Chem Notes

    • 2011 Words
    • 9 Pages

    For a reaction in solution we use the following equation energy change = mass of solution x heat capacity x temperature change Q N = m (g) cp (J g-1K-1) x ∆T ( K) Copyright(J) Goalby Bancroft's School x…

    • 2011 Words
    • 9 Pages
    Satisfactory Essays
  • Satisfactory Essays

    Honda Written Exam

    • 267 Words
    • 2 Pages

    In HERO written, 25 technical questions/ 15 aptitude/ 10 english questions were there in 30 mins….…

    • 267 Words
    • 2 Pages
    Satisfactory Essays
  • Good Essays

    nonlinear

    • 881 Words
    • 4 Pages

    temperatures below TC = 120 C, ni 6¼ 0. Thus, in the framework used above,…

    • 881 Words
    • 4 Pages
    Good Essays

Related Topics