Consider a concentric tube annulus for which the inner and outer diameters are 25 and 50 mm. water enters the annular region at 0.03 kg/s and 25°c. if the inner tube wall is heated electrically at a rate (per unit length) of q′ = 3000 w/m, while the outer tube wall is insulated, how long must the tubes be for the water to achieve an outlet temperature of 85°c? what is the inner tube surface temperature at the outlet, where fully developed conditions may be assumed?

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces. a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.

List and describe the parts of boxford cnc milling machine with pictures?

The ivanpah solar thermal power plant cost $2.2 billion to build. the gross plant electric output is 392 mw, and the net output is 377 mw. the planned capacity factor was 27.4%, but the actual capacity factor in 2016 was 20.5%. at best the plant thermal efficiency appears to be 18%. in addition, for the daily startup process, the solar plant also burned 1.3x10^12 btu of natural gas in 2016. the cost of natural gas in 2016 was about $2.5 per million btu. assuming a levelized annual fixed charge rate of 7%, determine (a) the capital cost (c/kwh) and (b) the fuel cost (e/k wh) for the electricity in 2016.