The Stillwater geothermal power plant in Nevada, which started full commercial operation in 1986, is designed to operate with seven identical units. Each of these seven units consists of a pair of power cycles, labeled Level I and Level II, operating on the simple Rankine cycle using an organic fluid as the working fluid. The heat source for the plant is geothermal water (brine) entering the vaporizer (boiler) of Level I of each unit at 325°F at a rate of 384,286 lbm/h and delivering 22.79 MBtu/h ("M" stands for "million"). The organic fluid that enters the vaporizer at 202.2°F at a rate of 157,895 Ibm/h leaves it at 282.4°F and 225.8 psia as saturated vapor. This saturated vapor expands in the turbine to 95.8°F and 19.0 psia and produces 1271 kW of electric power. About 200 kW of this power is used by the pumps, the auxiliaries, and the six fans of the condenser. Subsequently, the organic working fluid is condensed in an air-cooled condenser by air that enters the condenser at 55°F at a rate of 4,195,100 lbm/h and leaves at 84.5°F. The working fluid is pumped and then pre heated in a preheater to 202.2°F by absorbing 11.14 MBtu/h of heat from the geothermal water (coming from the vaporizer of Level II) entering the preheater at 211.8°F and leaving at 154.0°F. Taking the average specific heat of the geothermal water to be 1.03 Btu/lbm. °F, determine (a) the exit temperature of the geothermal water from the vaporizer, (b) the rate of heat rejection from the working fluid to the air in the condenser, (c) the mass flow rate of the geothermal water at the pre heater, and (d) the thermal efficiency of the Level I cycle of this geothermal power plant. GeneratorElectricityVapor111110Turbine3.VaporizerVaporCondenser-5Fluid pumpWorking fluidLand surfaceProduction pump6 PreheaterS2InjectionpumpCooler geothermal brineHot geothermal brineSchematic of a binary geothermal power plant.m8Airgeo 1. The Stillwater geothermal power plant in Nevada, which started fullcommercial operation in 1986, is designed to operate with seven identicalunits. Each of these seven units consists of a pair of power cycles, labeledLevel I and Level II, operating on the simple Rankine cycle using an organicfluid as the working fluid. The heat source for the plant is geothermal water(brine) entering the vaporizer (boiler) of Level I of each unit at 325°F at a rateof 384,286 lbm/h and delivering 22.79 MBtu/h (“M” stands for “million”).The organic fluid that enters the vaporizer at 202.2°F at a rate of 157,895Ibm/h leaves it at 282.4°F and 225.8 psia as saturated vapor. This saturatedvapor expands in the turbine to 95.8°F and 19.0 psia and produces 1271 kWof electric power. About 200 kW of this power is used by the pumps, theauxiliaries, and the six fans of the condenser. Subsequently, the organicworking fluid is condensed in an air-cooled condenser by air that enters thecondenser at 55°F at a rate of 4,195,100 lbm/h and leaves at 84.5°F. Theworking fluid is pumped and then pre heated in a preheater to 202.2°F byabsorbing 11.14 MBtu/h of heat from the geothermal water (coming fromthe vaporizer of Level II) entering the preheater at 211.8°F and leaving at154.0°F. Taking the average specific heat of the geothermal water to be 1.03Btu/lbm °F, determine (a) the exit temperature of the geothermal waterfrom the vaporizer, (b) the rate of heat rejection from the working fluid tothe air in the condenser, (c) the mass flow rate of the geothermal water atthe pre heater, and (d) the thermal efficiency of the Level I cycle of thisgeothermal power plant.

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The Stillwater geothermal power plant in Nevada, which started full commercial operation in 1986, is designed to operate with seven identical units. Each of these seven units consists of a pair of power cycles, labeled Level I and Level II, operating on the simple Rankine cycle using an organic fluid as the working fluid. The heat source for the plant is geothermal water (brine) entering the vaporizer (boiler) of Level I of each unit at 325°F at a rate of 384,286 lbm/h and delivering 22.79 MBtu/h ("M" stands for "million"). The organic fluid that enters the vaporizer at 202.2°F at a rate of 157,895 Ibm/h leaves it at 282.4°F and 225.8 psia as saturated vapor. This saturated vapor expands in the turbine to 95.8°F and 19.0 psia and produces 1271 kW of electric power. About 200 kW of this power is used by the pumps, the auxiliaries, and the six fans of the condenser. Subsequently, the organic working fluid is condensed in an air-cooled condenser by air that enters the condenser at 55°F at a rate of 4,195,100 lbm/h and leaves at 84.5°F. The working fluid is pumped and then pre heated in a preheater to 202.2°F by absorbing 11.14 MBtu/h of heat from the geothermal water (coming from the vaporizer of Level II) entering the preheater at 211.8°F and leaving at 154.0°F. Taking the average specific heat of the geothermal water to be 1.03 Btu/lbm. °F, determine (a) the exit temperature of the geothermal water from the vaporizer, (b) the rate of heat rejection from the working fluid to the air in the condenser, (c) the mass flow rate of the geothermal water at the pre heater, and (d) the thermal efficiency of the Level I cycle of this geothermal power plant.

Elements Of Electromagnetics

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ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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The Stillwater geothermal power plant in Nevada, which started full commercial operation in 1986, is designed to operate with seven identical units. Each of these seven units consists of a pair of power cycles, labeled Level I and Level II, operating on the simple Rankine cycle using an organic fluid as the working fluid. The heat source for the plant is geothermal water (brine) entering the vaporizer (boiler) of Level I of each unit at 325°F at a rate of 384,286 lbm/h and delivering 22.79 MBtu/h ("M" stands for "million"). The organic fluid that enters the vaporizer at 202.2°F at a rate of 157,895 Ibm/h leaves it at 282.4°F and 225.8 psia as saturated vapor. This saturated vapor expands in the turbine to 95.8°F and 19.0 psia and produces 1271 kW of electric power. About 200 kW of this power is used by the pumps, the auxiliaries, and the six fans of the condenser. Subsequently, the organic working fluid is condensed in an air-cooled condenser by air that enters the condenser at 55°F at a rate of 4,195,100 lbm/h and leaves at 84.5°F. The working fluid is pumped and then pre heated in a preheater to 202.2°F by absorbing 11.14 MBtu/h of heat from the geothermal water (coming from the vaporizer of Level II) entering the preheater at 211.8°F and leaving at 154.0°F. Taking the average specific heat of the geothermal water to be 1.03 Btu/lbm. °F, determine (a) the exit temperature of the geothermal water from the vaporizer, (b) the rate of heat rejection from the working fluid to the air in the condenser, (c) the mass flow rate of the geothermal water at the pre heater, and (d) the thermal efficiency of the Level I cycle of this geothermal power plant.

Generator
Electricity
Vapor
1
11110
Turbine
3.
Vaporizer
Vapor
Condenser
-5
Fluid pump
Working fluid
Land surface
Production pump
6 Preheater
S
2
Injection
pump
Cooler geothermal brine
Hot geothermal brine
Schematic of a binary geothermal power plant.
m
8
Air
geo

1. The Stillwater geothermal power plant in Nevada, which started full
commercial operation in 1986, is designed to operate with seven identical
units. Each of these seven units consists of a pair of power cycles, labeled
Level I and Level II, operating on the simple Rankine cycle using an organic
fluid as the working fluid. The heat source for the plant is geothermal water
(brine) entering the vaporizer (boiler) of Level I of each unit at 325°F at a rate
of 384,286 lbm/h and delivering 22.79 MBtu/h (“M” stands for “million”).
The organic fluid that enters the vaporizer at 202.2°F at a rate of 157,895
Ibm/h leaves it at 282.4°F and 225.8 psia as saturated vapor. This saturated
vapor expands in the turbine to 95.8°F and 19.0 psia and produces 1271 kW
of electric power. About 200 kW of this power is used by the pumps, the
auxiliaries, and the six fans of the condenser. Subsequently, the organic
working fluid is condensed in an air-cooled condenser by air that enters the
condenser at 55°F at a rate of 4,195,100 lbm/h and leaves at 84.5°F. The
working fluid is pumped and then pre heated in a preheater to 202.2°F by
absorbing 11.14 MBtu/h of heat from the geothermal water (coming from
the vaporizer of Level II) entering the preheater at 211.8°F and leaving at
154.0°F. Taking the average specific heat of the geothermal water to be 1.03
Btu/lbm °F, determine (a) the exit temperature of the geothermal water
from the vaporizer, (b) the rate of heat rejection from the working fluid to
the air in the condenser, (c) the mass flow rate of the geothermal water at
the pre heater, and (d) the thermal efficiency of the Level I cycle of this
geothermal power plant.

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