A 10-MW geothermal power plant is being considered at a location where geotherma

Question

A 10-MW geothermal power plant is being considered at a location where geothermal water at 230C is available. There are two different ways to use water:
a) Geothermal water can serve as the heat source for a closed Rankine power cycle with refrigerant-134a as the working fluid. Specify suitable temperatures and pressures for the cycle to maximize the power production per unit mass of geothermal water. Justify your selections.
b) Geothermal water can be flashed into a chamber to a lower pressure where part of the water evaporates. The liquid can be returned to the ground while the vapor can be used to drive the steam turbine. The pressure at the turbine inlet and the turbine exit are to remain above 200 kPa and 8 kPa, respectively. High pressure flash chambers yield a small amount of steam with high exergy whereas lower-pressure flash chambers yield comsiderably more steam but at a lower exergy. By trying several pressures, determine the optimum pressure of the flash chamber to maximize the power production per unit mass of geothermal water withdrawn. Assume that 10% of the produced power is used to drive the pumps and the other auxiliary equipment. A 10-MW geothermal power plant is being considered at a location where geothermal water at 230C is available. There are two different ways to use water:
a) Geothermal water can serve as the heat source for a closed Rankine power cycle with refrigerant-134a as the working fluid. Specify suitable temperatures and pressures for the cycle to maximize the power production per unit mass of geothermal water. Justify your selections.
b) Geothermal water can be flashed into a chamber to a lower pressure where part of the water evaporates. The liquid can be returned to the ground while the vapor can be used to drive the steam turbine. The pressure at the turbine inlet and the turbine exit are to remain above 200 kPa and 8 kPa, respectively. High pressure flash chambers yield a small amount of steam with high exergy whereas lower-pressure flash chambers yield comsiderably more steam but at a lower exergy. By trying several pressures, determine the optimum pressure of the flash chamber to maximize the power production per unit mass of geothermal water withdrawn. Assume that 10% of the produced power is used to drive the pumps and the other auxiliary equipment.
a) Geothermal water can serve as the heat source for a closed Rankine power cycle with refrigerant-134a as the working fluid. Specify suitable temperatures and pressures for the cycle to maximize the power production per unit mass of geothermal water. Justify your selections. a) Geothermal water can serve as the heat source for a closed Rankine power cycle with refrigerant-134a as the working fluid. Specify suitable temperatures and pressures for the cycle to maximize the power production per unit mass of geothermal water. Justify your selections.
b) Geothermal water can be flashed into a chamber to a lower pressure where part of the water evaporates. The liquid can be returned to the ground while the vapor can be used to drive the steam turbine. The pressure at the turbine inlet and the turbine exit are to remain above 200 kPa and 8 kPa, respectively. High pressure flash chambers yield a small amount of steam with high exergy whereas lower-pressure flash chambers yield comsiderably more steam but at a lower exergy. By trying several pressures, determine the optimum pressure of the flash chamber to maximize the power production per unit mass of geothermal water withdrawn. Assume that 10% of the produced power is used to drive the pumps and the other auxiliary equipment.

Explanation / Answer

a) Rankine power cycle is a thermodynamic cycle which having a ideal temperature and pressure conditions. In the rankine cycle heat converted into a mechanical work. As we know that rankine cycle is a idealized thermodynamic cycle and its pt condition also will be ideal. so we can say that for the maximize power production pressure-temperature conditions have to reach supercritical level.

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