An ion exchange resin is used to soften water. The ion exchange resin has a volume of 0.15 m3and a resin capacity of 63 kg CaCO3/m3. The flow of water is measured as 2500 L/day, the influent hardness is 340 mg/L as CaCO3 and the desired hardness is 70 mg/L as Ca CO3. If 25% of the water is bypassed, how long can the resin operate before all sites are saturated and regeneration required?

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.