A thermal wheel is used to recover energy from the extract air leaving a building at...
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A thermal wheel is used to recover energy from the extract air leaving a building at 5 kg/s mass flow rate and 23 °C dry bulb temperature. The heat is used to preheat the fresh air supply coming in at 5.5 kg/s and temperature of 12 °C. The thermal wheel speed is 20 rev/ min. (a) Draw a schematic of a typical thermal wheel with the temperature distribution of the air across the wheel  assume counter flow. (20%) (b) Using the data below calculate; i. ii. iii. The effectiveness of the matrix wheel. The rate of actual heat recovery. The temperatures of the air leaving the wheel. (40%) (10%) (10%) c) Calculate the temperature of the air leaving the wheel if the speed is increased to 25 revs/min. (20%) Data Assume mass of the thermal wheel is 25 kg Specific heat capacity of Air, cp air = 1.005 kJ/kgK Specific heat capacity of Matrix, Cp matrix = 0.4 kJ/kgK Heat transfer coefficient for extract air stream = 20 W/m²K Heat transfer coefficient for supply air stream = 25 W/m²K Face area for the wheel = 1.2 m² Width of the wheel = 0.2 m Assume the matrix has a surface area to volume ratio of 3200 m²/m³ A thermal wheel is used to recover energy from the extract air leaving a building at 5 kg/s mass flow rate and 23 °C dry bulb temperature. The heat is used to preheat the fresh air supply coming in at 5.5 kg/s and temperature of 12 °C. The thermal wheel speed is 20 rev/ min. (a) Draw a schematic of a typical thermal wheel with the temperature distribution of the air across the wheel  assume counter flow. (20%) (b) Using the data below calculate; i. ii. iii. The effectiveness of the matrix wheel. The rate of actual heat recovery. The temperatures of the air leaving the wheel. (40%) (10%) (10%) c) Calculate the temperature of the air leaving the wheel if the speed is increased to 25 revs/min. (20%) Data Assume mass of the thermal wheel is 25 kg Specific heat capacity of Air, cp air = 1.005 kJ/kgK Specific heat capacity of Matrix, Cp matrix = 0.4 kJ/kgK Heat transfer coefficient for extract air stream = 20 W/m²K Heat transfer coefficient for supply air stream = 25 W/m²K Face area for the wheel = 1.2 m² Width of the wheel = 0.2 m Assume the matrix has a surface area to volume ratio of 3200 m²/m³
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Related Book For
Essentials of Federal Taxation 2019
ISBN: 9781260190045
10th edition
Authors: Brian Spilker, Benjamin Ayers, John Robinson, Edmund Outslay, Ronald Worsham, John Barrick, Connie Weaver
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