Air is heated from an initial temperature of 300 K to a final temperature of 1200 K. Considering the variability of the specific heats, determine the change in specific internal energy and the change in specific enthalpy for the process.

Given: T1 = 300 K; T2 = 1200 K

What will be an ideal response?


From the air tables on on-line air properties: h1 = 300.19 kJ/kg, u1 = 214.07 kJ/kg
h2 = 1277.79 kJ/kg; u2 = 933.33 kJ/kg
So, ?h = h2 – h1 = 977.6 kJ/kg
?u = u2 – u1 = 719.3 kJ/kg

Trades & Technology

You might also like to view...

In most cases, if the beveling equipment is in good working order, your cut should be _____ and you should see little to no light coming from under the root face.? ?  

A. heavy? B. deep? C. round? D. square?

Trades & Technology

Which of the following systems will require de-powering the high voltage (HV) system during service?

A) Tire rotation B) Oil change C) Electric AC compressor replacement D) Air filter replacement

Trades & Technology

________ signaling uses a separate wire pair to carry signaling information, thus requiring a four-wire circuit between switches, one pair for normal voice conversation and the other for signaling

Fill in the blank(s) with correct word

Trades & Technology

The designer must always be alert to the processes involved in manufacturing and ______________

Fill in the blank(s) with correct word

Trades & Technology