Demonstration of a Novel Combined Cooling and Power Gas Turbine with Water Harvesting

Khan, Junaid; Lear, W. E.; Sherif, S. A.; Crittenden, John

doi:10.2514/6.2005-571

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…The model results were then compared with the experimental values, and the difference between the two was found to be within the acceptable limits, thus validating the computer code of the combined HPRTE/VARS cycle. The experimental results and the validation of the code are given in Khan et al [24,25]. Optimization is the process of finding the conditions that give maximum or minimum values of a function.…”

Section: Solution Methodsmentioning

confidence: 99%

Modeling and optimization of a novel pressurized CHP system with water extraction and refrigeration

Khan

2008

Int. J. Energy Res.

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SUMMARYA novel cooling, heat, and power (CHP) system has been proposed that features a semi-closed Brayton cycle with pressurized recuperation, integrated with a vapor absorption refrigeration system (VARS). The semi-closed Brayton cycle is called the high-pressure regenerative turbine engine (HPRTE). The VARS interacts with the HPRTE power cycle through heat exchange in the generator and the evaporator. Waste heat from the recirculated combustion gas of the HPRTE is used to power the absorption refrigeration unit, which cools the high-pressure compressor inlet of the HPRTE to below ambient conditions and also produces excess refrigeration in an amount that depends on ambient conditions. Water produced as a product of combustion is intentionally condensed in the evaporator of the VARS, which is designed to provide sufficient cooling for the inlet air to the high-pressure compressor, water extraction, and for an external cooling load. The computer model of the combined HPRTE/VARS cycle predicts that with steam blade cooling and a medium-sized engine, the cycle will have a thermal efficiency of 49% for a turbine inlet temperature of 14008C: This thermal efficiency, is in addition to the large external cooling load, generated in the combined cycle, which is 13% of the net work output. In addition, it also produces up to 1.4 kg of water for each kg of fuel consumed, depending upon the fuel type. When the combined HPRTE/VARS cycle is optimized for maximum thermal efficiency, the optimum occurs for a broad range of operating conditions. Details of the multivariate optimization procedure and results are presented in this paper.

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Section: Solution Methodsmentioning

confidence: 99%

Modeling and optimization of a novel pressurized CHP system with water extraction and refrigeration

Khan

2008

Int. J. Energy Res.

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“…NO x levels will be dictated primarily by fuelbound nitrogen levels, not by the thermal (Zeldovich) chemical mechanism, which is usually dominant. The demonstrator engine, discussed by Khan et al [4], reduced CO by two orders of magnitude. A visual examination of the exhaust stack during the current experiments showed no visible sign of smoke, implying complete combustion.…”

Section: Introductionmentioning

confidence: 99%

“…In one of the previous works on the modified HPRTE cycle performed by Khan et al [4], J. R. KHAN a one-ton vapor compression refrigeration unit was used for cooling the recirculated air before it was mixed with the incoming fresh air. About 1.3 l of water was extracted in the evaporator for about 20 l of fuel consumed.…”

Section: Introductionmentioning

confidence: 99%

Modeling and experimentation of a novel pressurized CHP system with water extraction

Khan

2008

Int. J. Energy Res.

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SUMMARYA novel cooling and power cycle is proposed, which combines a semi-closed cycle gas turbine called the high-pressure regenerative turbine engine (HPRTE) with a vapor absorption refrigeration system (VARS). This combined HPRTE/ VARS cycle is capable of producing power, water and refrigeration effect for external loads. In a previous study, the combined cycle was modeled using zero-dimensional steady-state thermodynamics, with specified values of polytrophic efficiencies and pressure drops for the turbo-machinery and heat exchangers. In this study, a modified version of the combined HPRTE/VARS cycle is experimentally investigated for the demonstration of the combined cycle concept and for the model validation. This modified HPRTE has two water-cooled heat exchangers instead of the absorption refrigeration system. The model of the original combined HPRTE/VARS cycle was modified to simulate the performance of the modified HPRTE cycle. Temperatures, pressure, mass flow rates and other overall cycle parameters obtained from the computer model are compared with the corresponding experimental values of the modified cycle. The agreement between the values is found to be within acceptable limits. In addition, the uncertainty analysis of the experimental data is undertaken to find the uncertainty in the final output variables: thermal efficiency and nondimensional water extraction parameter.

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A novel pressurized CHP system with water extraction and refrigeration

Khan¹,

Lear²,

Sherif³

et al. 2010

Applied Thermal Engineering

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Demonstration of a Novel Combined Cooling and Power Gas Turbine with Water Harvesting

Cited by 6 publications

References 5 publications

Modeling and optimization of a novel pressurized CHP system with water extraction and refrigeration

Modeling and optimization of a novel pressurized CHP system with water extraction and refrigeration

Modeling and experimentation of a novel pressurized CHP system with water extraction

A novel pressurized CHP system with water extraction and refrigeration

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