2. A triple-effect evaporator with forward feed is evaporating a sugar solution with negligible boiling-point rise and containing 10 wt % solids to 35% solids. Saturated steam at 205 kPa abs is being used. The pressure in the vapor space of the third effect is 13.65 kPa. The feed rate is 25,000 kg/hr and the temperature 300 K. The liquid heat сараcity is The heat-transfer coefficients are U1 = 3,123, U2 = 1,987, and U3 = 1,136 W/m²·K. Calculate a. the surface area of each effect if each effect has the same area, b. the steam economy, Cp= 4.19 - 2.35 x, where cp is in kJ/kg K and x in weight fraction solids.

A 20% NaOH solution at a mass flow rate of 8572 kg / hr, to be concentrated up to 60% It is fed to the evaporator at 50C and 20 kPa. At 315 kPa as heating medium saturated water vapor is used. Overall heat transfer coefficient 1504 W / m2 Since K is;  a) The amount of steam to be used, b) Heat transfer area, c) Find the steam economy. NOTE: Take cp = 1.884 kJ / kgK for superheated steam and enthalpy for superheated steam Use the formula Hv = Hs + cp T in your calculations.

The plot to the right shows the 1-D steady-state solution to the Pennes bioheat equation with T = 37°C at x = 0 (body core) and T = 43°C at x = 0.01 (body surface). The thermal conductivity is 0.5 W m-l °C-'. This scenario describes some surface tissue thermal conductivity (WI(m°C)) 0.5 blood perfusion rate (1/5) T("C) 43 heating (e.g., laser). Which trace represents the highest value of the blood perfusion rate. 42 41 A 40 А. А В. В 39 38 E С.С 0.002 X(m) 0.010 0.004 0.006 0.008 D. D Е. Е

In a liquid formulation process, several ingredients are mixed into purified water. The mixing action creates an exothermic of 40,000 Btu/hr. Assume the heat capacity of the solution is approximate of water. The chill water applied to the jacket of the compounding tank enters at 42 deg F and exits at 50 deg F. The chill water GPM is