An R-22 compressor has a 5 percent clearance volume and a displacement rate of 80 L/s and pumps against a condensing temperature of 40°C. For the two different evaporating temperatures of -10 °C, compute the refrigerant flow rate in kg/s assuming that the clearance volumetric efficiency applies.
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An R-22 compressor has a 5 percent clearance volume and a displacement rate of 80 L/s and pumps against a condensing temperature of 40°C. For the two different evaporating temperatures of -10 °C, compute the refrigerant flow rate in kg/s assuming that the clearance volumetric efficiency applies.
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- A two pass steam surface condenser is to be designed to condense 10000 kg/hr of steam having an enthalpy of 2240 kj/kg. Condenser pressure is 13.79 kpa. circulating water enters the condenser at 25 C and leaves at 40 C. the outside and inside diameter for a water tube, OD=20 mm, ID = 17 mm and water velocity of 3 m/s. if the overall coefficient of the heat transfer is 14100 kj/hr-m-C of outside tube surface, determine the amount of circulating water in m/hr.1.) Determine the refrigerant name and chemical formula of R-22 2.) An ice plant produces 20 tons of ice per day at -15oC from water at 25 oC. If miscellaneous losses are 12 % of the freezing and chilling load, calculate the refrigeration capacity of the plant, in TR.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 of the 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 an example solution spreadsheet .....
- What is the developed coefficient of conductance of a tube-in-tube condenser having a water terminal temperature of 28.9°C and 18.3°C? The rate of water discharge from a 5.4mm copper alloy tubes 3.05 meters long are surrounded by steam flow of 97 kg/min at 104.4°C.A four-effect evaporator is being considered for concentrating a fruit juice that has no appreciable boiling-point elevation. Steam is available at 143.27 kPa, and the boiling point of the 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 the third effect, and 1800W/(m2°C) in the fourth effect. Calculate the boiling-point temperatures of the product in the fi rst,second, and third effects. Assume the heating areas in all the effects are equal to 50m2 each. The mass fl ow rate of steam to the 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 from the fi rst effect leaves at 6.25% total solids, and the concentration of product leaving the second effect is 8.82% total solids.A four-effect evaporator is being considered for concentrating fruit juice that has no appreciable boiling-point elevation. Steam is available at 143.27 kPa and the boiling point of the product in the fourth effect is 45°C. The overall heat transfer coefficients are 3000W/m2°C in the first effect, 2500W/m2°C in the second effect, 2100W/m2°C in the third effect, and 1800W/m2°C in the fourth effect. Calculate the boiling-point temperature of the product in the first, second and third effects. Assume the heating areas in all the effect are equal to 50m2 each. The mass flow rate of steam to the first effect is 2400 kg/h. The feed rate to the first effect of 5% total solids fluid is 15,000kg/h, the concentrated product from the first effect leave at 6.25% total solids, and the concentration of product leaving of the second effect is 8.82% total solids.
- SOLVE THE PROBLEM AND SHOW THE DETAILED SOLUTION A steam condenser receives 10 kg per second of steam with an enthalpy of 2,570-kJ/kg. The steam condenses into liquid and leaves with an enthalpy of 160kJ/kg. Cooling water passes through the condenser with temperature increases from 13 to 24 Calculate the cooling water flow rate in kg/s.A straight-condensing 10,000 kW turbine has a guaranteed steam rate of 5.90 kg/kW.hr when exhausting at 5.0 kPa. Exhaust steam enters the condenser at 92% quality, and it is estimated that fouling will decrease the overall coefficient by 30% during operation. Cooling water is available at 18 ℃, and for design purposes, 1 ½ in OD 16 BWG Brass tubes (thickness = 0.065 in, k=62 BTU/hrftF°.) are specified with 9 C° rise in cooling water, which circulates at 5 ft/s. Inside and outside film coefficients are hi=960 and ho=1474 BTU/hrft2F°. Design a condenser for this turbine, considering tube and boundary resistance as flat surfaces and neglecting any crossflow factor. Determine the followinga) Effective overall coefficient of heat transferb) Volume flow rate of cooling waterc) Number of tubes for single passd) Length of tubesThe food storage room requires a cooling system with a capacity of 10 tons of refrigeration that operates at an evaporator temperature of -17.8 Celsius and a condenser temperature of 28 degrees Celsius. The refrigerant used is R - 717 and the system operates in saturated conditions. Determine C.O.P, refrigerant flow rate and heat loss rate in the condenser.
- A two-pass steam surface condenser is to be designed to condense10,000 kg/hr of steam having an enthalpy of 2,240 kJ/kg. Condenserpressure is 13.79 kPa. Circulating water enters the condenser at 25 OCand leaves at 40 OC. The outside and inside diameter for a water tube;OD=20 mm , ID = 17 mm and water velocity of 3 m/s. If the overallcoefficient of heat transfer is 14,100 kJ/hr-m2-OC of outside tubesurface, determine the amount of circulating water in m3/hr.A double pass water-cooled shell-and-tube type condenser has a total number of tubes equal to 42. The tubes are of 14 mm inside diameter, 16 mm outside diameter and 4 m length. The overall heat transfer coefficient is 3510 kJ/hr-m2 -°C. Cooling water enters the condenser at 25°C at a velocity of 1.5 m/s and leaves with a temperature rise of 6.5°C. (a) Calculate the outside heating surface area of the tubes in m2 ; (b) Determine the mass flow rate of water in kg/s and the volumetric flow rate in L/s (using an average density of 996.5 kg/m3 ); (c) Estimate the condensing temperature of the refrigerant; (d) If the ammonia refrigerant enters and leaves the condenser at saturation conditions, compute the mass flow rate of the refrigerant and the condenser pressure in kPa.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