Anew counter flow heat exchanger was installed to replace the old heat exchanger. the new heat exchanger has an overall heat transfer coefficient of 280 w/m²k. an ethylene glycol enters the tube side at 90°c and exits at 70°c while water enters the shell side at 25°c and leaves at 40°c. after a few months, the heat exchanger gives a fouling factor of 0.0005 m².kw. if the surface area is 90 m² and the specific heats at constant pressure for ethylene glycol and water are 2.43 kj/kg. k and 4.2 kj/kg. k respectively, determine: i)-the rate of heat transfer in the heat exchanger ( watts), and (ii) the mass flow rates of both working fluids (kg/s).

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.

Agas contained within a piston-cylinder assembly e end nation about same energy states, 1 and 2, where pi 10 bar, v undergoes two processes, a and b, between the sam 0.1 m3, ui-400 kj and p2 1 bar, v2 1.0 m2, u2 200 kj: process a: process from 1 to 2 during which the pressure- volume relation is pv constant process b: constant-volume process from state 1 to a pressure of 2 bar, followed by a linear pressure-volume process to +20 0 state 2 kinetic and potential energy effects can be ignored. for each of the processes a and b, (a) sketch the process on p-v coordinates, (b) evaluate the work, in kj, and (c) evaluate process the heat transfer, in kj

Aspherical thermocouple measurement errors a spherical thermocouple made of constantin transfer coefficient between the gas and the thermocouple is h used to measure the temperature of a gas. the heat 400 w/m2 k. calculate the maximum diameter d of the thermocouple if the thermocouple's measurement error should be w 23 within 5% of the initial temperature difference in 5 seconds. for constantin, k 8920 kg/m3, and c 410 j/kg. k.