Air at dry-bulb temperature of 75°F and wet-bulb temperature of 65°F is heated to 250°F and fed to a dryer. If the air leaves the dryer 50% saturated and if the dryer operation is adiabatic, obtain the water evaporated in the dryer per 100 pound dry air A. 0.22 B. 10.4 C. 3.05 D. 5.94

A single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 25 ° C. The evaporator is operated on Steam (80% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 80 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it    (a) Steam demand rate = Answer   kg / hour.    b. Steam economy when condensate temperature is released at 75 ° C. = Answer   (kg of water evaporated / kg of steam)

Steam enters the turbine of a vapor power plant at 600 lbf/in.2, 1000°F and exits as a two-phase liquid–vapor mixture at 90°F. Condensate exits the condenser at 85°F and is pumped to 600 lbf/in.2 The turbine and pump isentropic efficiencies are 90 and 80%, respectively. The net power developed is 1 MW.Determine:(a) the percent steam quality at the turbine exit.(b) the percent thermal efficiency.(c) the steam mass flow rate, in lb/h.

A single effect evaporator is used to concentrate 10 000 kg / hr of tomato juice from 5% total solids to 30% total solids. The juice enters the evaporator at 15 ° C. The evaporator is operated on Steam (85% quality) at 143.27 kPa. The vacuum in the evaporator allows the juice to boil at 75 ° C. The specific heat of the dilute material is 4.1 kJ / (kg ° C) and the concentrate product is 3.1 kJ / (kg ° C). Count it (a) Steam demand rate = Answer kg / hour. b. Steam economy when condensate temperature is released at 75 ° C. = Answer (kg of water evaporated / kg of steam)