8. Two smooth rubber-lined fire hose each 90 m long and having a 25 mm diameter nozzles, are connected to a 150 mm fire hydrant. Cc = 1.0 and Cv = 0.97. It is necessary to throw streams 24 m high, the nozzles being 6 m above the hydrant. Determine the horsepower that must be supplied at the hydrant. f = 0.023. Note: energy loss at the pipe is hf = fLV²/D2g or 0.0826fLQ²/D5 8 HA = 56.45 m Q = 0.0213 m³/s HP = 15.8 hp 90 m 60 mm , 24 m 6 m

Suppose a wet mixture of old bread, leaves, and soil is placed in a pile 1 m tall, and a long thermometer is struck in the middle of the pile. Every other day. the pile is aerated by throwing the mixture into a new pile. Draw a graph showing the temperature in the pile during the first two weeks and explain why these temperature changes occurs.

You serve as the president of XYZ corporation, which is an energy intensive manufacturing operation. You have four boilers to produce steam and electricity for your operations. One is a semi-suspension fired boiler with a capacity of 100 tons of coal per hour. The boiler can also burn supplemental fuel such as coconut or macadamia nut shells. The other three boilers arc peaking units and burn fuel oil. The City of Podunk has approached you about the possibility of burning solid waste as a supplemental fuel. As the president of the XYZ Corporation, you need to develop answers to many political, social, and technical questions before you make a commitment to the city. a. What specific questions would you ask your own power plant engineer about the possibility of accepting Podunk’s MSW? b. What specific additional data would you need from the city before you discuss this further?

For Problems 11.11, 11.12, and 11.13, calculate the U-factors.