Multiple Evaporator Systems it may be required to
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- A condenser of a steam power plant indicates a vacuum of 65 cm of Hg when barometer reads 75 cm Hg. The condensing steam has a temperature of 45 o C and a dryness fraction 0.9. Calculate: (i) the amount of air to be handled by the pump per min. if the rate of steam condensation is 2000 kg/hr. (ii) vacuum efficiency of the condenser.Air enters a humidifier at 34.25°C and 30% RH. If the air leaves the humidifier at 70% RH. Determine: The exit dry-bulb temperature of the air in °C.The saturation effectiveness in %.a supply tank having 14m long and 1.7m diameter is used to store fuel oil with 34degree API at 110degree C. if the tank is used for diesel power plant consuming 62 kg/hr of fuel, determine the number of days the supply tank can hold continuous operation.
- Benzene at 20 0C is pumped from one storage tank to a reactor (density=878 kg/ m3 ). Volumetric flow rate of benzene is 9.5x 10-4 m3 /s. The difference in the elevations of the two unit is 40m. The tank whichserves as a source is open to the atmosphere while the tank which receives the benzene has a pressure of P2 kPa abs in the vapor space above the benzene. 1‐in, schedule‐40 steel pipe and 2‐in Sch‐40 steel pipe isused in suction and discharge line respectively. Total friction loss of the system given as 135 J/kg . Pressure gauges in the pipeline at the inlet and outlet of the pump read (P3) 34.5kPa and (P4) 1051.6kPa, respectively. Efficiency of pump is %75 a) Calculate the power of pump (kW). (Fluid Mechanics Question) (Please answer it detailed and step by step)using EES, plot the enthalpy of vaporization of refrigerant 134a as a dunction of temp over the temp range -20 C to 80 C by using the clapeyron eqyation and the refrigerant 134a data in the software. Discuss your result give EES CODEThe evaporator design temperature may in some cases operate at a slightly ____(higher or lower) pressure and temperature on high-efficiency equipment because the evaporator is larger.
- Design a hydrocooling unit to cool down fruits and vegetables from 30 °C to 5 °C in 20 minutes at a rate of 20,000 kg of fruit or vegetables/h. The design must fulfill the following requirements: The unit will be an immersion flooded system. It must be able to cool down and transport the products in chill water. The tank has the following dimensions approximate. three meters wide and up to 90 cm hight. The water will circulate and be cooled through the evaporation section of a refrigeration system. The refrigerant temperature inside the coils will be -2 °C, and the water temperature must not drop below 1 °C and must not exceed 6 °C. Assuming reasonable values for the average density, specific heat, and porosity of the product (the fraction of the volume of air in a box), recommend reasonable values for: The speed of the water through the canal, the capacity of the cooling system. the compressor power.An aqua ammonia absorption plant operates between pressures at 206.8 and 1378 kPaa. The strongsolution enters the generator saturated at 82.2°C and the weak solution leaves the generator saturated at93.3°C. Saturated vapor leaves the generator with a concentration of 0.993 kg NH3 /kg mixture. Assuming thatthe strong solution leaving the absorber is saturated, neglecting pump work and heat losses, calculate perkg/min flow of refrigerant through the evaporator:a. the mass flow of strong solution entering the generator in kg/minb. the mass flow of weak solution leaving the generator in kg/minc. the enthalpy of the weak solution entering the absorber in kJ/kg weak solution and the heat rejected in the absorber in kW Saturated liquid at 1378 kPaa and 82.2°C has a concentration of 0.46 kg NH3 /kg mixture and an enthalpy of209.2 kJ/kg of mixture, saturated liquid at 1378 kPaa and 93.3°C has a concentration of 0.41 kg NH3 /kg mixtureand an enthalpy of 255.68 kJ/kg of mixture, saturated liquid…Design a hydrocooling unit that can cool fruits and vegetables from 30°C to 5°C at a rate of 20,000 kg/h under the following conditions: The unit will be of flood type that will cool the products as they are conveyed into the channel filled with water. The products will be dropped into the channel filled with water at one end and picked up at the other end. The channel can be as wide as 3 m and as high as 90 cm. The water is to be circulated and cooled by the evaporator section of a refrigeration system. The refrigerant temperature inside the coils is to be -2°C, and the water temperature is not to drop below 1°C and not to exceed 6°C. Assuming reasonable values for the average product density, specific heat, and porosity (the fraction of air volume in a box), recommend reasonable values for the quantities related to the thermal aspects of the hydrocooler, including (a) how long the fruits and vegetables need to remain in the channel, (b) the length of the channel, (c) the water…
- A 15-ton refrigeration system is used to make ice. The water is available at 20°C. Refrigerant12 is used with saturated temperature limits of -25°C and 54°C. Determine (a) the COP, (b) therefrigerant flow rate, (c) the temperature at discharge of the compressor, (d) the volume flowrate, and (e) the maximum kg of ice manufactured per day.Engineer CoolAir is working on designing an air conditioning unit that handles the combined air flow from two food processing rooms with the following quantities: 4000 ft^3/ min at 80° F wet bulb and 50% saturated; 3000 ft^3/min at 70° F dry bulb and 65°F wet bulb temperatures. (a) What is the total mass flow rate? (b) What is the dry bulb temperature? (c) what is the wet bulb temperature?8.3 A four-effect evaporator is being considered for concentratinga fruit juice that has no appreciable boiling-point elevation.Steam is available at 143.27 kPa, and the boiling point ofthe product in the fourth effect is 45°C. The overall heat-transfer coeffi cients are 3000 W/(m 2 °C) in the fi rst effect,2500W/(m2 °C) in the second effect, 2100W/(m2°C) in thethird effect, and 1800W/(m2°C) in the fourth effect. Calculatethe boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all theeffects are equal to 50m2 each. The mass fl ow rate of steam tothe fi rst effect is 2400kg/h, the feed rate to the fi rst effect of 5%total solids fl uid is 15,000kg/h, the concentrated product fromthe fi rst effect leaves at 6.25% total solids, and the concentrationof product leaving the second effect is 8.82% total solids. Make it in the form of a spreadsheet for solving the example problem no. 8.2 and 8.3