Computerized economic optimization of refrigeration system design

Usta, N
Ileri, A
The purpose of this paper is to show the importance of economic optimization of large capacity or industrial refrigeration systems and to present the results and conclusions obtained by a computer software which was developed specifically to determine the economic optimum values of the design parameters of refrigeration systems. Both liquid chillers and groups of cold storage rooms operating at various levels of low temperatures are covered. Various case studies and sensitivity analyses have been performed to provide specific numerical examples and to determine the effects of certain parameters. It was found that condenser type, ambient temperature, yearly operating hours, electricity price, real interest rate and refrigerant are the most important parameters in the economic optimum design of refrigeration systems.


Data driven landslide hazard assessment using geographical information systems and remote sensing
Süzen, Mehmet Lütfi; Doyuran, Vedat; Department of Geological Engineering (2002)
The purpose of this thesis is to generate and evaluate a concise system of data driven landslide hazard assessment procedure. The Asarsuyu catchment area and Bolu Mountain highway pass are selected for this purpose In this study, three data domains, which are remote sensing products, geological maps and topographical maps are used. The landslides of four different historical periods are interpreted using aerial photographs. Land cover is extracted from satellite images. Thirteen sets of parameter maps are p...
Numerical investigation of protection measures against water hammer in the yesilvadi hydropower plant
Dursun, Samet; Bozkuş, Zafer; Department of Civil Engineering (2013)
The purpose of this thesis is to analyze protection measures against water hammer numerically and compare the results with measured field data of Yesilvadi HEPP project. Pressure relief valves are used as protective measure against water hammer in Yesilvadi HEPP project formulation. The hydropower system is investigated numerically with software, Bentley HAMMER, which uses method of characteristics for solving nonlinear equations of transient flow. Yesilvadi HEPP project is analyzed for load rejection, inst...
Automated calibration of water distribution networks
Apaydın, Öncü; Merzi, Nuri; Department of Civil Engineering (2013)
Water distribution network models are widely used for various purposes such as long-range planning, design, operation and water quality management. Before these models are used for a specific study, they should be calibrated by adjusting model parameters such as pipe roughness values and nodal demands so that models can yield compatible results with site observations (basically, pressure readings). Many methods have been developed to calibrate water distribution networks. In this study, Darwin Calibrator, a...
Optimization of water distribution networks using mixed-integer linear programming
Uzun, Eren; Altan Sakarya, Ayşe Burcu; Department of Civil Engineering (2016)
The present study aims to discuss the advantages and disadvantages of the design of water distribution networks by making use of mixed integer linear programming. The developed optimization algorithm considers the minimization of the total cost as the objective function. The total cost of water distribution network is defined as cost of pipes, reservoirs and pumps. Nodal demands, nodal pressure limits and pipe velocity limits are satisfied while optimizing the network. Energy equation is the equality constr...
Periodic stationarity conditions for periodic autoregressive moving average processes as eigenvalue problems
Ula, TA; Smadi, AA (American Geophysical Union (AGU), 1997-08-01)
The determination of periodic stationarity conditions for periodic autoregressive moving average (PARMA) processes is a prerequisite to their analysis. Means of obtaining these conditions in analytically simple forms are sought. It is shown that periodic stationarity conditions for univariate and multivariate PARMA processes can always be reduced to eigenvalue problems, which are computationally and analytically easier to deal with. Two different lumpings of the periodic process are considered along this li...
Citation Formats
N. Usta and A. Ileri, “Computerized economic optimization of refrigeration system design,” ENERGY CONVERSION AND MANAGEMENT, pp. 1089–1109, 1999, Accessed: 00, 2020. [Online]. Available: