Life Cycle Cost Analysis of a Novel Cooling and Power Gas Turbine Engine

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Vaibhav Malhotra ◽  
W. E. Lear ◽  
J. R. Khan ◽  
S. A. Sherif
Keyword(s):  
High Pressure ◽  
Life Cycle ◽  
Cost Analysis ◽  
Life Cycle Cost ◽  
Cost Savings ◽  
Life Cycle Costs ◽  
Life Cycle Cost Analysis ◽  
Absorption Refrigeration ◽  
Power Capacity ◽  
Turbine Engine

A life cycle cost analysis was performed to compare life cycle costs of a novel gas turbine engine to those of a conventional microturbine with similar power capacity. This engine, called the high-pressure regenerative turbine engine (HPRTE), operates on a pressurized semiclosed cycle and is integrated with a vapor absorption refrigeration system. The HPRTE uses heat from its exhaust gases to power the absorption refrigeration unit, which cools the high-pressure compressor inlet of the HPRTE to below ambient temperatures and also produces some external refrigeration. The life cycle cost analysis procedure is based on principles laid out in the Federal Energy Management Program. The influence of different design and economic parameters on the life cycle costs of both technologies is analyzed. The results of this analysis are expressed in terms of the cost ratios of the two technologies. The pressurized nature of the HPRTE leads to compact components resulting in significant savings in equipment cost versus those of a microturbine. Revenue obtained from external refrigeration offsets some of the fuel costs for the HPRTE, thus proving to be a major contributor in cost savings for the HPRTE. For the base case of a high-pressure turbine (HPT) inlet temperature of 1373 K and an exit temperature of 1073 K, the HPRTE showed life cycle cost savings of 7% over a microturbine with a similar power capacity.

Life Cycle Cost Analysis of a Novel Cooling and Power Gas Turbine Engine

2005 ◽  
Author(s):  
Vaibhav Malhotra ◽  
W. E. Lear ◽  
J. R. Khan ◽  
S. A. Sherif
Keyword(s):  
High Pressure ◽  
Life Cycle ◽  
Cost Analysis ◽  
Life Cycle Cost ◽  
Cost Savings ◽  
Life Cycle Costs ◽  
Life Cycle Cost Analysis ◽  
Absorption Refrigeration ◽  
Power Capacity ◽  
Turbine Engine

A Life cycle cost analysis (LCCA) was performed to compare life cycle costs of a novel gas turbine engine to that of a conventional microturbine with similar power capacity. This engine, called the High Pressure Regenerative Turbine Engine (HPRTE) operates on a pressurized semiclosed cycle and is integrated with a Vapor Absorption Refrigeration System (VARS). The HPRTE uses heat from its exhaust gases to power the absorption refrigeration unit which cools the high-pressure compressor inlet of the HPRTE to below ambient temperatures and also produces some external refrigeration. The life cycle cost analysis procedure is based on principles laid out in the Federal Energy Management Program (FEMP). The influence of different design and economic parameters on the life cycle costs of both technologies is analyzed. The results of this analysis are expressed in terms of the cost ratios of the two technologies. The pressurized nature of the HPRTE leads to compact components resulting in significant savings in equipment cost versus those of a microturbine. Revenue obtained from external refrigeration offsets some of the fuel costs for the HPRTE, thus proving to be a major contributor in cost savings for the HPRTE. For the base case of a high-pressure turbine (HPT) inlet temperature of 1373 K and an exit temperature of 1073 K, the HPRTE showed life cycle cost savings of 7% over a microturbine with a similar power capacity.

A Life Cycle Cost Analysis Approach for Selection of a Typical Heavy Usage Multistage Centrifugal Pump

2006 ◽  
Author(s):  
Laxman Y. Waghmode ◽  
Ravindra S. Birajdar ◽  
Shridhar G. Joshi
Keyword(s):  
Life Cycle ◽  
Cost Analysis ◽  
Centrifugal Pump ◽  
Life Cycle Cost ◽  
Lifetime Cost ◽  
Maintenance Cost ◽  
Life Cycle Costs ◽  
Life Cycle Cost Analysis ◽  
Initial Cost ◽  
Multistage Centrifugal Pump

It is well known that the pumps are the largest consumers of industrial motor energy and account for more than 25% of electricity consumption. The life cycle cost of a pump is the total lifetime cost associated with procurement, installation, operation, maintenance and its disposal. For majority of heavy usage pumps, the lifetime energy and/or maintenance cost will dominate the life cycle costs. Hence a greater understanding of all the cost components making up the total life cycle costs should provide an opportunity to achieve a substantial savings in energy and maintenance costs. This will further enable optimizing pumping system efficiency and improving pump and system reliability. Therefore in this context, the life cycle cost analysis of heavy usage pumps is quite important. This paper focuses on an application of a methodology of determining the life cycle cost of a typical heavy usage multistage centrifugal pump. In this case, all the cost components associated with the pump-set have been determined and classified under different categories. The data with regard to initial investment costs, operation costs, maintenance and repair costs and disposal costs for the pump considered for this case study was collected from the concerned pump manufacturer along with the unit cost of each component, quantity used and their weights. By applying the principles of reliability and maintainability engineering and using the data obtained from the design, manufacturing and maintenance departments, the component-wise values of MTBF (Mean Time Between Failures) and MTTR (Mean Time To Repair) were estimated. The results of the life cycle cost analysis of the specimen pump were compared with the life cycle costs of similar pumps reported in the literature. From this comparison of results, it can be concluded that, the initial cost of the pump is the only a fraction of the total life cycle cost. The operating cost of the pump dominates the life cycle costs especially in case of heavy usage pumps. The maintenance cost varies approximately from 0.6 to 2.5 times the initial cost of the pump. The life cycle cost of the pump varies approximately from 12 to 33 times the initial cost of the pump. The operation and maintenance cost is almost 92 to 97 per cent of the life cycle cost. The detailed analysis carried out in this paper is expected to provide guidelines to the pump manufactures/practicing engineers in selecting a heavy usage multistage centrifugal pump based on the total lifetime cost rather than only on initial price.

scholarly journals Life-cycle cost analysis of bridges subjected to fatigue damage

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Stefano Sacconi ◽  
Laura Ierimonti ◽  
Ilaria Venanzi ◽  
Filippo Ubertini
Keyword(s):  
Life Cycle ◽  
Cost Analysis ◽  
Fatigue Damage ◽  
Life Cycle Cost ◽  
Traffic Monitoring ◽  
Traffic Load ◽  
Life Cycle Costs ◽  
Life Cycle Cost Analysis ◽  
Damage Estimation ◽  
Engineering Demand Parameter

AbstractLife-cycle cost analysis (LCCA) is a decision-making tool particularly useful for the design of bridges as it predicts lifetime expenses and supports the inspections management and the maintenance activities. LCCA allows to consider uncertainties on loads, resistances, degradation and on the numerical modelling and structural response analysis. It also permits to consider different limit states and different types of damage in a unified framework. Among the types of damages that can occur to steel and steel-concrete composite bridges, fatigue is one of the most dangerous ones, as it may lead to sudden and fragile rupture, even at operational traffic levels. In this context, the present paper proposes a framework for LCCA based on the use of the Pacific Earthquake Engineering Research (PEER) equation which is for the first time utilized for fragility and cost analysis of bridges subjected to fatigue, highlighting the possibility of treating the problem of fatigue damage estimation with an approach similar to the one currently adopted for damage induced by other hazards, like earthquake and wind. To this aim, a damage index computed through the Palmgren-Miner’s rule is adopted as engineering demand parameter. The framework is applied to a composite steel-reinforced concrete multi-span roadway bridge by evaluating the fatigue limit state from different traffic load models, i.e. a Technical Code-based model and a model based on results of Weigh in Motion monitoring system. The evolution over time of the probability of failure and the life-cycle costs due to fatigue damage induced by heavy traffic loads are investigated for different probability distributions of the engineering demand parameter and for different fragility models. The comparison between the fatigue failure probabilities and the life-cycle costs obtained with the two traffic models, encourages the adoption of traffic monitoring systems for a correct damage estimation.

Introducing Life Cycle Cost Analysis in an Undergraduate Gas Turbine Engine Design Capstone Course

2020 ◽  
Author(s):  
Aaron R. Byerley ◽  
Steve A. Brandt
Keyword(s):  
Life Cycle ◽  
Cost Analysis ◽  
Gas Turbine ◽  
Life Cycle Cost ◽  
Gas Turbine Engine ◽  
Production Costs ◽  
Life Cycle Cost Analysis ◽  
Decision Matrix ◽  
Turbine Engine ◽  
Engine Design

Abstract The purpose of this paper is to introduce the basics of life cycle cost analysis for use in an undergraduate, senior-level capstone, gas turbine engine design course. This paper will support the heightened interest within the military acquisition community that now requires life cycle cost analysis to be included in the proposals submitted by defense contractors. The capstone design course includes both the gas turbine engine cycle selection and engine component design that supports a particular aircraft application. While the students have been taught how to estimate the fuel costs, engine development costs, and the time-varying production costs of engines, they have not yet been provided instruction on how to factor all three types of costs into an engineering economics, time-value-of-money, present value analysis. This paper will fill that gap and serve as a resource for the students who must now consider life cycle cost as an element in their design decision matrix along with engine performance, technical risk, and development time. The typical case compares an engine where the upfront development and production costs associated with a more advanced level of technology are high early on in the life cycle but over time has a lower fuel cost compared to an engine with a lower development and production cost but with a higher fuel cost. This paper illustrates how the aerodynamics, thermodynamics, and engineering economics can be brought together to inform and defend a decision about which of the two (or more) alternatives is best. The engineering economic analysis is spreadsheet based and uses inflation adjusted, total annual costs to calculate the present value for use in a decision matrix.

Economic Evaluation of Multislice Computed Tomography Scanners Through a Life Cycle Cost Analysis

2011 ◽  
Vol 4 (5) ◽  
pp. 158-161 ◽  
Author(s):  
A. Morfonios A. Morfonios ◽  
◽  
D. Kaitelidou D. Kaitelidou ◽  
G. Filntisis G. Filntisis ◽  
G. Baltopoulos G. Baltopoulos ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Life Cycle ◽  
Economic Evaluation ◽  
Cost Analysis ◽  
Life Cycle Cost ◽  
Multislice Computed Tomography ◽  
Life Cycle Cost Analysis ◽  
Tomography Scanners
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