Effectiveness, ntu for heat exchangers. problem 4.9-4, p351. outlet temperature and effectiveness of an exchanger. hot oil at a flow rate of 3.00 kg/s (cp = 1.92 kj/kg×k) enters an existing counterflow exchanger at 400 k and is cooled by water entering at 325 k (under pressure) and flowing at a rate of 0.70 kg/s. the overall u = 350 w/m2 ×k and a = 12.9 m2. calculate the heat transfer rate and the exit oil temperature.

An ideal otto cycle with air as the working fluid has a compression ratio of 8. the minimum and maximum temperatures in the cycle are 300 k and 1340 k. use constant specific heats at room temperature to determine (a) the amount of heat transferred to the air during the heat- addition kj/kg, (b) the thermal efficiency, and (c) the thermal efficiency of a carnot cycle ope limits. process, in rating between the same temperature

You are making beer. the first step is filling the glass carboy with the liquid wort. the internal diameter of the carboy is 15 in., and you wish to fill it up to a depth of 2 ft. if your wort is drawn from the kettle using a siphon process that flows at 3 gpm, how long will it take to fill?

A-mn has a cubic structure with a0 0.8931 nm and a density of 7.47 g/cm3. b-mn has a different cubic structure, with a0 0.6326 nm and a density of 7.26 g/cm3. the atomic weight of manganese is 54.938 g/mol and the atomic radius is 0.112 nm. determine the percent volume change that would occur if a-mn transforms to b-mn.