Solve d) & e) The overhead vapor from a distillation column is totally condensed in a water-cooled condenser at 120°F and220 psig, and the condensed stream is sent to a reflux drum at the same temperature and pressure, The vapordesign flow rate is 10,000 lbm/hr, and the avcrage latent heat of vaporization is 125 Btu/lbm. The cooling waterinlet and outlet temperatures are 80°F and I 10°F, respectively.(a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is62.4 Ib/fn' and its specific heat is 1.0 Btu/lbm"F. Also, 7.48 gal of liquid = 1 ft' of liquid.(Note - If you cannot calculate a cooling water flow rate in part (a), assume the cooling water flow rate is 100gpm at design conditionsThe cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional tothe volumetric flow rate squred, A control valve is instulled in the cooling water line, and the total pressuredrop over the condenser and control valve is constant at 35 psi. The pressure in the reflux drum is measured bya pressure senson/transmitter that has a range of 150-250 psig and an output signal range of 4-20 mA. Aproportional controller with a gain of Ke = 4 is used to control pressure in the reflux drum by manipulating thecooling water flow rate. The current signal (mA) from the controller is converted to an air pressure signal(psig) in the I/P transducer.(b) Determine the valve size cocfficient Cy if the flow rate through a widc-open valve must be twice thedesign flow rate.(c) Specify the action of the control valve and controller.(d) Determine the valve opening fi) at the design flow rate.(e) Determine the current signal from the pressure transmitter at the design flow rate.VaporCoolingWater InCoolingWater OutCondenserPCITRefluxLiquid

calculate the cooling water flow rate:-25,500lbhr125Btulblb °FBtu125°F7.48 gal62.3 lbhr60 min=255…

ct and outlet temperatures are 80°F and I 10 F, respectively. Verage latent heat of vaporization is 125 Btu/lbm. The cool ing water (a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is 62.4 Ib/n' and its specific heat is 1.0 Btu/lbm"F. Also, 7.48 gal of liquid = I ft' of liquid. ote - If you cannot calculate a cooling water flow rate in part (a), assume the cooling water flow rate is 100 n at design conditions e cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional to volumetric flow rate squercd, A control val ve is installrd in the coolinit water line d the tote

ct and outlet temperatures are 80°F and I 10 F, respectively. Verage latent heat of vaporization is 125 Btu/lbm. The cool ing water (a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is 62.4 Ib/n' and its specific heat is 1.0 Btu/lbm"F. Also, 7.48 gal of liquid = I ft' of liquid. ote - If you cannot calculate a cooling water flow rate in part (a), assume the cooling water flow rate is 100 n at design conditions e cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional to volumetric flow rate squercd, A control val ve is installrd in the coolinit water line d the tote

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter47: High-pressure, Low-pressure, And Absorption Chilled-water Systems

Section: Chapter Questions

Problem 13RQ: The subcooling temperature in a condenser can be measured by taking the difference between the A....

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.

Question

Solve d) & e)

The overhead vapor from a distillation column is totally condensed in a water-cooled condenser at 120°F and
220 psig, and the condensed stream is sent to a reflux drum at the same temperature and pressure, The vapor
design flow rate is 10,000 lbm/hr, and the avcrage latent heat of vaporization is 125 Btu/lbm. The cooling water
inlet and outlet temperatures are 80°F and I 10°F, respectively.
(a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is
62.4 Ib/fn' and its specific heat is 1.0 Btu/lbm"F. Also, 7.48 gal of liquid = 1 ft' of liquid.
(Note - If you cannot calculate a cooling water flow rate in part (a), assume the cooling water flow rate is 100
gpm at design conditions
The cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional to
the volumetric flow rate squred, A control valve is instulled in the cooling water line, and the total pressure
drop over the condenser and control valve is constant at 35 psi. The pressure in the reflux drum is measured by
a pressure senson/transmitter that has a range of 150-250 psig and an output signal range of 4-20 mA. A
proportional controller with a gain of Ke = 4 is used to control pressure in the reflux drum by manipulating the
cooling water flow rate. The current signal (mA) from the controller is converted to an air pressure signal
(psig) in the I/P transducer.
(b) Determine the valve size cocfficient Cy if the flow rate through a widc-open valve must be twice the
design flow rate.
(c) Specify the action of the control valve and controller.
(d) Determine the valve opening fi) at the design flow rate.
(e) Determine the current signal from the pressure transmitter at the design flow rate.
Vapor
Cooling
Water In
Cooling
Water Out
Condenser
PC
IT
Reflux
Liquid

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