Acooling tower for an engineering process takes in air at 20 °c dry bulb with a relative humidity of 70% and discharges air at 29 °c dry bulb with a relative humidity of 95%. the air flow is recorded to be 400 m per hour at the inlet point. what is the quantity of heat energy being produced by the process and how much will it cost in top-up water alone, for an 8 hour shift, if the top-up water costs €0.20/litre. you may assume the air and humidity values are consistent during the complete 8hr shift.