Question

A boiler with a mass of 10 kg uses 54 kW to heat 20 gallons of liquid water initially at 15°C. The average specific heats for the boiler material and the water are 0.48 kJ/kg·K and 4.18 kJ/kg·K, respectively. The average density of the water is 850 kg/m³. According to the service restrictions of the ASME Boiler and Pressure Vessel Code (ASME BPVC.IV-2015, HG-101), hot water boilers should not be operating at temperatures exceeding 120°C at or near the boiler outlet. Determine the final water temperature that would exit the boiler after 30 min of heating at 54 kW. Would this be in compliance with the ASME Boiler and Pressure Vessel Code?

Answer 1