2_MAE 334Woodward - lab3

# 2_MAE 334Woodward - lab3 - MAE 334 Lab 3 If the apparatus...

This preview shows page 1. Sign up to view the full content.

MAE 334 Lab 3 If the apparatus were perfectly insulated, all of the mechanical work would go into heating the cylinder. Actually, some heat is continually lost to the surroundings. If P is the rate of mechanical work (in Watts) and Q is the rate of heat loss to the surroundings (also in Watts), the calorimeter gains energy at a rate: (1) Q P dt dE = For the calorimeter, the relationship between energy gain and temperature rise is proportional to its thermal capacity: dt dT cm dt dE cal = (2) Here, the thermal capacity in Joules per degree Celsius (J/C) is the product of the specific heat of aluminum ( ) and the mass of the calorimeter ( ). Also, the heat loss to the surroundings is proportional to the temperature difference between the cylinder and the laboratory surroundings: c cal m (3) ) ( lab T T H Q = where the overall convection factor H in Watts per degree Celsius (W/C) is the product of the convective heat transfer coefficient (h) and the surface area of the calorimeter (A). Thus,
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Ask a homework question - tutors are online