(c) Specify the action of the control valve and controller. (d) Determine the valve opening f() at the design flow rate. (e) Determine the current signal from the pressure transmitter at the design flow rate.

Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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I need parts c,d,e

DIGHET P
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 average latent heat of vaporization is 125 Btu/lbm. The cooling water
inlet and outlet temperatures are 80°F and 110°F, respectively.
(a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is
62.4 lb/ft³ and its specific heat is 1.0 Btu/lbm °F. Also, 7.48 gal of liquid = 1 ft³ 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 squared. A control valve is installed 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 sensor/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.
The cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional to
the volumetric flow rate squared. A control valve is installed 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 sensor/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 coefficient Cy if the flow rate through a wide-open valve must be twice the
design flow rate.
(c) Specify the action of the control valve and controller.
(d) Determine the valve opening f(/) at the design flow rate.
(e) Determine the current signal from the pressure transmitter at the design flow rate.
Vapor
Cooling
Water In
Condenser
Good
PC
Reflux
Liquid
Cooling
Water Out
Transcribed Image Text:DIGHET P 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 average latent heat of vaporization is 125 Btu/lbm. The cooling water inlet and outlet temperatures are 80°F and 110°F, respectively. (a) Calculate the cooling water flow rate in gpm at the design conditions. Assume the density of water is 62.4 lb/ft³ and its specific heat is 1.0 Btu/lbm °F. Also, 7.48 gal of liquid = 1 ft³ 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 squared. A control valve is installed 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 sensor/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. The cooling water pressure drop through the condenser is 5 psi at the design conditions and it is proportional to the volumetric flow rate squared. A control valve is installed 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 sensor/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 coefficient Cy if the flow rate through a wide-open valve must be twice the design flow rate. (c) Specify the action of the control valve and controller. (d) Determine the valve opening f(/) at the design flow rate. (e) Determine the current signal from the pressure transmitter at the design flow rate. Vapor Cooling Water In Condenser Good PC Reflux Liquid Cooling Water Out
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