330 W 06 HW #4 (previous HW was actually #3) – Due Feb 3, 2006 1. Sandler 3.26 part a only (3 rd ed.) = 5.1 part a only (4 th ed.) Extra part of this problem: if we could somehow replace the Joule-Thompson expansion in the air conditioner with a small turbine that expands the gas adiabatically and reversibly (doing some work that could be used to charge the car battery for example), how would the answers to part (a) change? Assume the temperatures are the same as in part a. Also, don’t include the work in this turbine-expander in the work needed to run the air conditioner. 2. Sandler 3.29 (3 rd ed.) = 5.4 (4 th ed.) 3. Sandler 3.35 (3 rd ed.) = 5.6 (4 h ed.) On Monday January 30 I will (try to) quickly cover air conditioners and liquifaction – both of which make use of the Joule-Thompson process – and then we will start the material on thermodynamic relations (“real substances”) in Ch. 4 (3 rd edition) or Ch. 6 (4 th edition).