You are designing a heating system for an incubator. You are testing the performance of the heater and measure the pressure, temperature and relative humidity going into the heater to be 98 kPa, 17C, and 40%, respectively. The temperature leaving the heater and going into the incubator is 25C. The air is entering the heater at 5 m³/min. a) How much heat is transferred by the heater? b) has the relative humidity at the exit increased or decreased? Explain your answer. For extra practice, if the volume of air entering the heater is doubled, how does this affect a) and b)?