In a heating system, liquid water flows in a circular tube at a mass flow rate of 3.5 g/s. The water enters the tube at 5°C, where it is heated at a rate of 1025 W. The tube surface is maintained at a constant temperature. The effectiveness of the system to heat water in the tube has been determined to have a number of transfer units of NTU = 2. According to the service restrictions of the ASME Boiler and Pressure Vessel Code, hot water heaters should not be operating at temperatures exceeding 120°C at or near the heater outlet. The inner surface of the tube is lined with polyvinylidene chloride (PVDC) lining. According to the ASME Code for Process Piping, the recommended maximum temperature for PVDC lining is 79°C. Take the specific heat of water at 40°C as cp = 4179 J/kg·K.
In a heating system, liquid water flows in a circular tube at a mass flow rate of 3.5 g/s. The water enters the tube at 5°C, where it is heated at a rate of 1025 W. The tube surface is maintained at a constant temperature. The effectiveness of the system to heat water in the tube has been determined to have a number of transfer units of NTU = 2. According to the service restrictions of the ASME Boiler and Pressure Vessel Code, hot water heaters should not be operating at temperatures exceeding 120°C at or near the heater outlet. The inner surface of the tube is lined with polyvinylidene chloride (PVDC) lining. According to the ASME Code for Process Piping, the recommended maximum temperature for PVDC lining is 79°C. Take the specific heat of water at 40°C as cp = 4179 J/kg·K.
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