100-kg of r-134a at 200 kpa are contained in a pistoncylinder device whose volume is 12.322 m3. the piston is now moved until the volume is one-half its original size. this is done such that the pressure of the r-134a does not change. determine the final temperature and the change in the total internal energy of the r-134a.

Apiping systems consists of 6 m of 6-std type k and 12 m of 4-std type k, both drawn copper tubing. the system conveys ethylene glycol at a rate of 0.013 m3/s. the pressure drop across the system is to be calculated. there are two 90° elbows in the 6-in pipe, a reduction from the 6-in pipe to the 4-in pipe and four 90° elbows in the 4-in pipe. all fittings are soldered (same as flanged) and regular. the inlet and outlet of the system are at the same height.