HW5 spring 2011

# HW5 spring 2011 - The cooling water enters at 5°C and...

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CHEG 2313 Thermo I HW#5 Spring 2011 Due Wednesday, March 2, 2011 in class. 1. Water is to be heated from a pipeline temperature of 15°C to 85°C using superheated steam at 550°C and 3 MPa in a steady-state process to produce 15 kg/s of heated water. The heating is to be done in a mixing tank by directly injecting the steam, all of which condenses. Determine the two inlet mass flows needed to meet the desired hot water flow rate. Assume no heat loss. (7 pts) 2. You are fermenting 100 L of apple juice to make apple cider. The apple juice starts at 5°C and needs to be maintained at no higher than 12°C to produce the tastiest cider. During the fermentation process, heat is produced at a rate of 10 J/kg*s. Heat is to be removed by flowing cooling water around the fermentation vessel.
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Unformatted text preview: The cooling water enters at 5°C and exits at 10°C. Given: ( 29 ( 29 mL g juice apple K kg kJ juice apple C v 04 . 1 / ; * 7 . 2 . = = ρ a) How long will it take the apple juice to reach 12°C? (5 pts) b) At what flowrate should cooling water be supplied? (5 pts) Assume the cooling water is turned on the moment the apple juice reaches 12°C. 3. A horizontal frictionless piston-and-cylinder system is subjected to 1.013 bar external pressure. The piston and cylinder do not conduct heat, but heat can be added to the steam by a heating coil. The steam has an initial temperature of 300°C and enough heat is added to increase the temperature by 200°C. Determine the work, heat and entropy of generation for this process. (8 pts)...
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