Two insulated tanks, labelled a and b, are connected by a valve that is initially closed. tank a contains air at 100 kpa and 350 k and has a volume of 0.75 m3. tank b contains air at 800 kpa and 1000 k and has a volume of 0.5 m3. find the final temperature and pressure of the air after the valve is opened and the contents of the two tanks have mixed.

Refrigerant-134a enters the compressor of a refrigerator as superheated vapor at 0.14 mpa and -10°c at a rate of 0.05 ka/s and leaves at 0.8 mpa and 50°c. the refrigerant is cooied in the condenser to 0.72 mpa and 26'c. it is then throttled to 0.15 mpa. sketch the t-s diagram for the system and evaluate: 6) the rate of heat removai from the refrigerated space (kw), it) the power input to the compressor (kw), ii) the isentropic efficiency of the compressor (%), and iv) the cop of the refrigerator.