Ph 213 Chapter Notes -Vaporization

Assuming that the human skin has a 1.0cm thick layer of skin tissue and a surface area of 1.5m^2, estimate the rate at which heat is conducted from inside the body to the surface if the skin temp. is 34'C (Assume a normal body temp. reads 37'C for the temp of the interior.

A combined-cycle power plant has a thermodynamic efficiency of 81%. it dumps waste heat from it's stream cycle at 5degreesC. (a) What is the max temp in it's gas turbine? If the gas turbine stage alone has 63% thermodynamic efficiency, what are (b) the intermediate temp and (c) the thermodynamic efficiency of the steam cycle alone?

BTU is defined as heat needed to raise the temp of 1 lbs of water by 1 degree F. How many kilo-calories and joules are 1 BTU