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Evaluation efficiency of low-power fans used in the means of transport

Nygard Adam, Bartoszewicz Jarosław

Combustion Engines

2020

R. 59, nr 4

15--20

The article presents test results on low-power fans used in the means of transport. Fans evaluation was in the context of energy efficiency. Interest in scientific topics related to low-power fans has its source in the reports of the Chief Inspector of Environmental Protection on the state of the natural environment in Poland and European Union reports assessing our natural environment. The goal of the article is to compare experimental results with Minister of Economy Regulation of March 11th, 2014, which introduces changes in accordance to European Parliament and Council Directive 2009/125/WE, with regard to ecodesign requirements for fans driven by motors with an electric input power between 125 W and 500 kW.

Constructing improvement plan for inputs through dialogue with DM about DEA-Efficiency for DMUs

Uemura Y.

Control and Cybernetics

1999

Vol. 28, no 1

133-139

Evaluation of efficiency of the DMUs (Decision Making Units) in a company is a very important problem. Thus, the studies of evaluation of efficiency are being actively carried out on the basis of the production functions, for example Cobb-Douglas production function and fuzzy loglinear production function (fuzzy Cobb-Douglas model). Recently, DEA (Data Envelopment Analysis) was applied to evaluation of efficiency, in the sense of benchmarking evaluation. After having evaluated DMUs by DEA, we obtain the improvement plan for every input in the inefficient DMUs. Though we many not be able to decrease inputs at one time according to the DEA plan, it is natural to construct some phased improvement plans for decreasing the inputs. First, we propose to support the construction of some phased improvement plans by the sensitivity analysis for the evaluated efficiency by applicatiion of definite limits to the decrease of inputs. Second, we evaluate this method by applying it to the case of bank data.