1 / 19

# OCN 5401 - PowerPoint PPT Presentation

OCN 5401. Chapter 3 Heat Transfer Instructor: Dr. George A. Maul gmaul@fit.edu / X 7453. Heat Flux (W·m -2 = J·s -1 ·m -2 ). Q s – radiation from the sun Q b – back radiation from Earth Q e – evaporative heat loss or gain Q h – sensible heat loss or gain

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.

## PowerPoint Slideshow about 'OCN 5401' - jack-park

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

### OCN 5401

Chapter 3

Heat Transfer

Instructor: Dr. George A. Maul

gmaul@fit.edu / X 7453

Heat Flux(W·m-2 = J·s-1·m-2)

• Qs – radiation from the sun

• Qb – back radiation from Earth

• Qe – evaporative heat loss or gain

• Qh – sensible heat loss or gain

• Qv – advective heat loss or gain

Qt = Qs – Qb – Qe – Qh – Qv

reflected

V1

V2

scattered

refracted

absorbed

Index of Refraction (η2/η1) = V1/V2

ηwater-air = 1.333 (at 20°C)

transmitted

Willebrord Snell

Max Planck

CSUN: What is the solar constant?

where

If TSUN = 5775K, QSUN = ?

Solar Heating

Inflow = Outflow

CSUN(1-A)πr2 = 4πr2σT4

If A=0.3 and CSUN=1367 W·m-2, what is T=?

requires an extra term

QGHE: What is the greenhouse effect?

TEarth: What is Earth’s temperature?

A: Is Earth’s albedo fixed?

How would Earth’s temperature change if the albedo changed from 30% to 29%?

minus

If TEARTH(A=30%) = 288K, TEARTH(A=29%) = ?

Relative Humidity (RH) and Saturation Vapor Pressure (e from 30% to 29%?s)

Example: RH = ?

Tair = 30°; Tdew point = 10°

es = 39 mb; eair = 12 mb

Evaporation from the Sea Surface from 30% to 29%?

Qe = ρwaterE·L

E is in meters per second, and latent heat of evaporation

L= 2495 x 103 J·kg-1

Seasonal Thermocline from 30% to 29%?

Seasonal Sea Level from 30% to 29%?

Satellite Imagery from 30% to 29%?

Infrared Image

Chapter 3

Questions?