An air conditioner for an airport receives desert air at 45◦C, 10% relative humidity and must deliver it to the building at 20◦C, 50% relative humidity. The buildings have a cooling system with R-410a running with a high pressure of 3000 kPa and a low pressure of 1000 kPa, and their tap water is 18◦C. What should be done to the air? Find the needed heating/cooling per kg dry air.