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The top surface (0.5 m × 0.5 m) of an oven is 60°C for a particular operating condition when the room air is 23°C. To reduce heat loss from the oven and to minimize burn hazard, it is proposed to create a 50-mm air space by adding a cover plate.
(a) Assuming the same oven surface temperature Ts for both situations, estimate the reduction in the convection heat loss resulting from installation of the cover plate. What is the temperature of the cover plate?
(b) Explore the effect of the cover plate spacing on the convection heat loss and the cover plate temperature for spacings in the range 5 ≤ L ≤ 50 mm. Is there an optimum spacing?
Evaporation of Sugar Solution in Double Effect Evaporator. A double-effect evaporator with reverse feed is used to concentrate 4536 kg/h of a 10 wt %sugar solution to 50%. Correct equations for the mass, energy balances: Correct inputs& constraints..
A string of negligible diameter is drawn down the center-line of a pipe containing a Newtonian fluid. At what velocity, w, must the string be drawn in order to vaporize the fluid?
When the J and K inputs of a JKFF are tied to logic 1, this device is known as a divide-by-2 counter. Complete the timing diagram shown in Figure P6.1.49 for this counter.
Calculate the ratio of the depletion region width W under a forward bias of 0.3 V to the equilibrium width W0, for a GaAs abrupt p-n junction with a doping level on the p-type side of NA= 2 x 1017 cm·3 and a doping level ..
the equilibrium conversion is negligible at 300 K, but becomes appreciable at temperatures above 500 K.
Discuss the consequent effects on the real and reactive power losses, and on the voltage drop across the series impedance of the transmission system.
The latter is available from the Trace Research and Development Center at the University of Wisconsin, Madison. Also try visiting the applicable websites.
Calculate the equilibrium conversion and the CSTR and PFR volumes necessary to achieve 98% of the equilibrium conversion and calculate the time to reach 90% conversion if the reactor is a batch reactor filled to the brim.
No-load test: line-to-line voltage 400 V, input power 1770 W, input current 18.5 A, and friction and wind age loss 600 W
What is the gas-phase composition if pure methane enters the reactor, and what fraction of the methane decomposes?
Design a suitable TSA system for this process. Estimate the amount of adsorbent needed, the vessel volumes, and the minimum regenerate heat requirement for your design. The activated carbon adsorbent has average bulk density 120 kg/m3 and heat cap..
Calculate the mass flow rate of distillate and bottom product per hour - the mass flow rate of liquid entering the reboiler and the vapour leaving the reboiler per hour.
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