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final homework 2009

# final homework 2009 - EML 4930/6417 Final Homework...

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EML 4930/6417 Final Homework Assignment Worth 100 pts 1. You are going to do a preliminary design for a hydronic solar system for a 24,050 sq. ft classroom/laboratory building at a university campus. The cooling load calculation for the laboratory spaces indicates a cooling load of 70 tons and the classroom section has a cooling load of 50 tons. Consider an ammonia water/absorption cycle with a generator operating at 200 deg F and a condenser at 100 deg F. Assume the absorber also operates at 100 deg F. The absorption chiller provides 120 tons of refrigeration capacity with an evaporator operating at 40 deg F. Find the following assuming an ideal absorption cycle: a. Cooling water flow rate (gpm) required for the condenser assuming cooling water is available from a cooling tower at 85 deg F and must return to the tower at 95 deg F. What size schedule 40 steel pipe would you provide for this cooling water? b. Cooling water flow rate (gpm) required for the absorber assuming cooling water is available from a cooling tower at 85 deg F and must return to the tower at 95 deg F. What size schedule 40 steel pipe would you provide for this cooling water? c. If the cooling tower is 25 feet tall and there is 900 equivalent feet of pipe and fittings in the distribution piping, select a B&G base mounted pump with a non- overloading motor (1750 rpm) for the cooling water distribution. Assume the pressure drop in the absorption chiller condenser is 11.7ft and in the absorber is 25 ft of head and that they are piped in parallel (therefore, only one of these would be in the longest run of pipe). Provide a pump summary sheet for the selection and a copy of the pump curve showing the operating point. d. Chilled water flow rate (gpm) required for the evaporator assuming chilled water is supplied to the building at 45 deg F and returns to the chiller at 55 deg F. What size schedule 40 steel pipe would you provide for this cooling water?

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• Fall '08
• Staff
• pressure drop, Heating, ventilating, and air conditioning, hot water, water system, Chiller, absorption chiller

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final homework 2009 - EML 4930/6417 Final Homework...

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