SCIENCE help!!!!!!.....10 POINTS!?

Question

does anyone know a method that can measure heat trasnfer?

apart from the r-value....

PLEASE HELP

Answer 1

The basic equation is

q = m*Cp*delta-T

where q is the heat transfer rate, m is the mass flow rate, Cp is the specific heat of air and delta-T is the temperature difference.

This equation applies to both sides of the heat exchanger, and the q's must be equal. Your equation is using CFM, which is a measure of volumetric flow rate rather than mass flow rate. To convert, use

m = Q*rho

where Q is the volumetric flow rate and rho is the density of air.

You need to keep track of the units of measurement in all of these equations. It's possible that the 4.5 factor in your equation takes care of the gas properties (specific heat and density) and the units, but I couldn't say for certain without access to my reference books (don't keep them at home!).