A car wash service uses 150 liter of pressurized (3 bar) warm water (45oC) to wash each car. It takes 10 min to wash each car. The service has 10 washing lanes, and it is open from (14:00 to 21:00) every day and 360 day per year. Each day 400 cars are washed. Fresh water at 1 bar pressure and 15oC is pressurized in a pump, then heated to desired temperature, and then delivered to the washing lanes. Assume pump operates adiabatically and its isentropic efficiency is 85%. All the other equipment of the car wash uses a total of 2 kW (for all lanes and other parts of the business) of power during operation. One person can operate 2 lanes.

Consider product is washing a car.

a. Energy input requirements as well as required components (you need to make it work) b. Identify the irreversibilities (entropy production) in the processes or in different components c. Performance on the first law (energy basis). You can use EUF, thermal efficiency, coefficient of performances as it fits the application d. Identify exergy flows and exergy destruction e. Performance on the second law basis, (exergetic efficiency)