Part I

In the energy balance equations there are several different temperature variables that are used.

List each of the T variables and explain what it represents.

Part II

Read the following problem statement and determine which temperature values should be used in a reactor energy balance and where.

A CSTR is used for the reaction A+BC. A is fed to the reactor at 50 ^oC, B is fed at 100 ^oC, and an inert feed at 20^oC is also added. When running properly, the reactor should operate between 150 and 160 ^oC. Cooling water at 20 ^oC flows through a jacket around the reactor at a sufficiently high flowrate that its temperature rise is negligible. The average ambient air temperature is 0^oC. The reactor operator drinks 60 ^oC coffee in the morning and 5^oC pop in the afternoon. The following property data is available for A, B, and C: Heats of formation at 293 K, heat capacities as a function of temperature that are valid over the range 0-250 ^oC, and thermal conductivities at 100 ^oC.