Superheated steam at 90 bar, 625 °C (State 1) undergoes a 3-step process: (i.) First, it is throttled by a valve to 16 bar (State 2). (ii.) Next, it is isochorically cooled to a saturated vapor (State 3). (iii.) Finally, it is compressed isentropically back to the original 90 bar pressure (State 4).

Required information NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. An air-conditioning system operates at a total pressure of 1 atm and consists of a heating section and a humidifier that supplies wet steam (saturated water vapor) at 100°C. Air enters the heating section at 10°C and 70 percent relative humidity at a rate of 32 m /min, and it leaves the humidifying section at 20°C and 60 percent relative humidity. Use data from the tables. Sat. vapor 100°C Heating coils Humidifier 10°C Air 20°C 70% 60% ymYmin P=1 atm Determine the temperature and relative humidity of air when leaves the heating section. The temperature is °C. The relative humidity is %.

What is the critical pressure of R-134a, in kPa?