If the steam used to heat the evaporator has a quality of 70% at a pressure...
If the steam used to heat the evaporator has a quality of 70% at a pressure of 29.72 psi, what is stream temperature?
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If the steam used to heat the evaporator has a quality of 70% at
a pressure...
A tomato-juice evaporator takes in juice at the rate of 1200 kg/h. If the concentrated juice...
A tomato-juice evaporator takes in juice at the rate of 1200 kg/h. If the concentrated juice contains 35% of solids and the hourly rate of removal of water is 960 kg, (a) calculate the moisture content of the original juice, (b) the quantity of steam needed per hour for heating if the evaporator works at a pressure of 25 kPa. Assume no heat losses. Assume saturated steam at 50% quality is used to heat the evaporator at a temperature of...
Steam enters a counterflow heat exchanger operating at steady state at 0.07 MPa with a quality...
Steam enters a counterflow heat exchanger operating at steady state at 0.07 MPa with a quality of 0.9 and exits at the same pressure as saturated liquid. The steam mass flow rate is 1.3 kg/min. A separate stream of air with a mass flow rate of 100 kg/min enters at 30oC and exits at 60oC. The ideal gas model with cp = 1.005 kJ/kg·K can be assumed for air. Kinetic and potential energy effects are negligible. Determine the temperature of...
Saturated steam at a pressure of 2 bar is to be used to heat a stream...
Saturated steam at a pressure of 2 bar is to be used to heat a stream of ethane. The ethane enters a heat exchanger at 16ºC and 1.5 bar at a rate of 795 m3 /min and is heated at constant pressure to 93ºC. The steam condenses and leaves the exchanger as a liquid at 27ºC. The specific enthalpy of ethane at the given pressure is 941 kJ/(kg.oC) at 16ºC and 1073 kJ/(kg.oC) at 93ºC a) Draw a flow diagram...
A boiler is at a pressure of 80 psia. Use steam tables for sea level. (i)...
A boiler is at a pressure of 80 psia. Use steam tables for sea level. (i) At what temperature does the water boil?(ii) How much heat input ( in Btu/hr) is required to heat 20 pounds per hour of water from 70 F to this boiling point? (iii) How much heat input (in Btu/hr) is needed to convert 20 pounds per hour of water from 70 F into saturated steam at 80 psi pressure?( iv) How much heat input (in...
Problem 3 Steam enters a heat exchanger at 0.1 bar with a quality of 0.95 and...
Problem 3 Steam enters a heat exchanger at 0.1 bar with a quality of 0.95 and condensate exits at 0.1 bar and 45'C. Cooling water enters the heat exchanger in a separate stream as a liquid at 20'C and exits as a liquid at 35 C with no changes in pressure. Heat transfer from the outside of the heat exchanger and changes in the kinetic and potential energies of the flowing streams can be ignored. For steady state operation, (a)...
A hydrogen stream at 293K and under atmospheric pressure has a dew point of 285K. It...
A hydrogen stream at 293K and under atmospheric pressure has a dew point of 285K. It is to be further humidified by adding saturated steam at 220kN/m2 through a nozzle at the rate of 2kg steam to 30kg of hydrogen feed. Given that the gas outlet pressure after the mixing process is latm, determine: j) humidity of the hydrogen stream, ii) bumidity of the resultant stream, and iii) temperature of the resultant stream Specific heat of hydrogen-14.6kWkgĶ Specific heat of...
3-40 In the condenser of a steam power plant the steam from the turbine enters the...
3-40 In the condenser of a steam power plant the steam from the turbine enters the condenser at 0.10 bar with a quality of 95 percent and leaves at the same pressure as a saturated liquid. The steam is condensed by transferring heat to a stream of cooling water which enters at 1.3 bars and 5°C and leaves the heat exchanger at 1.2 bars and 25°C·The environmental temperature is 5°C. Determine a. the change in stream availability (exergy) of the...
A refrigerator is operating between a high pressure of 0.7 MPa and low pressure of 0.1 MPa
A refrigerator is operating between a high pressure of 0.7 MPa and low pressure of 0.1 MPa. The Isentropic efficiency of the compressor is 0.8. The working fluid of the refrigeration cycle is R134a flowing at 0.1 kg/s. The specific heat of air is 1.005 kJ/kgk and density of air is 1.2 kg/m. Calculate a. The compressor exit temperature. b. The compressor power input. c. The evaporator cooling load. d. The coefficient of performance.e. The steam quality at the evaporator inlet.f. If the cooling load...
Q1. A double-effect evaporator is being used (in forward mode) to concentrate a sodium chloride solution...
Q1. A double-effect evaporator is being used (in forward mode) to concentrate a sodium chloride solution from 4 to 20 weight %. The solution enters the first effect at 298K at a rate of 3000 kg/h, and saturated steam at a pressure of 1.5 bars is fed into a tube bundle in the Ist effect. The steam condenses at 1.5 bars and the condensate is withdrawn at the saturation temperature corresponding to this pressure. The pressure at the second effect...
Evaporation of Sugar Solution in a Multiple-Effect Evaporator. A triple-effect evaporator with forward feed is...
Evaporation of Sugar Solution in a Multiple-Effect Evaporator. A triple-effect evaporator with forward feed is evaporating a sugar solution with negligible boiling- point rise (less than 1.0 K, which will be neglected) and containing 5 wt% solids to 25% 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 22 680 kg/h and the tempera- ture 299.9 K. The liquid heat capacity...
Problem 3 Steam enters a heat exchanger at 0.1 bar with a quality of 0.95 and condensate exits at 0.1 bar and 45'C. Cooling water enters the heat exchanger in a separate stream as a liquid at 20'C and exits as a liquid at 35 C with no changes in pressure. Heat transfer from the outside of the heat exchanger and changes in the kinetic and potential energies of the flowing streams can be ignored. For steady state operation, (a)...
A hydrogen stream at 293K and under atmospheric pressure has a dew point of 285K. It is to be further humidified by adding saturated steam at 220kN/m2 through a nozzle at the rate of 2kg steam to 30kg of hydrogen feed. Given that the gas outlet pressure after the mixing process is latm, determine: j) humidity of the hydrogen stream, ii) bumidity of the resultant stream, and iii) temperature of the resultant stream Specific heat of hydrogen-14.6kWkgĶ Specific heat of...
3-40 In the condenser of a steam power plant the steam from the turbine enters the condenser at 0.10 bar with a quality of 95 percent and leaves at the same pressure as a saturated liquid. The steam is condensed by transferring heat to a stream of cooling water which enters at 1.3 bars and 5°C and leaves the heat exchanger at 1.2 bars and 25°C·The environmental temperature is 5°C. Determine a. the change in stream availability (exergy) of the...
Q1. A double-effect evaporator is being used (in forward mode) to concentrate a sodium chloride solution from 4 to 20 weight %. The solution enters the first effect at 298K at a rate of 3000 kg/h, and saturated steam at a pressure of 1.5 bars is fed into a tube bundle in the Ist effect. The steam condenses at 1.5 bars and the condensate is withdrawn at the saturation temperature corresponding to this pressure. The pressure at the second effect...
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