Design a plate and frame heat exchanger for the following problem:
Hot water at 0.0063 m^3/s, 82.2°C, enters a plate and frame heat exchanger and is cooled to 57.2°C. Cold water enters this same exchanger at 0.00756 m^3/s, 37.8°C. The plates are made of stainless steel (316SS) with a heat transfer area of 0.316 m^2 per plate. The plate spacing is 5.08 mm, the plate width is 381 mm, and the plate thickness is 1.016 mm.
Hint: You should use iteration method to solve this problem. Assume a value for number of plates and solve the problem to find q_c, q_h and q_by LMTD. If q_c = q_h = q_by LMTD, your assumption is good. Otherwise repeat the procedure with a new guess for number of plates.

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

On a average work day more than work place firs are reorted

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79