Abstract: This paper shows a discussion for selection of thermodynamic operating conditions in an absorption heat transformer (AHT). An AHT is the only thermal machine that increases the source temperature using heat for does it with a negligible mechanical energy. Thermodynamic parameters for AHT are the same than for heat pumps: Coefficient of performance (COP) and Gross Temperature Lift (GTL). Those parameters are not linearly correlated. Instead GTL increases its value when COP decrease. The criterion for an optimal design is based on an objective function with COP and GTL. This paper use AHT thermodynamic data operating with Carrol – water for show the best design operating conditions.

• Publication Date: 19-Aug-2016
• DOI: 10.15224/978-1-63248-102-3-63
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Abstract: The diagnosis of Induction Motors (IMs) is crucial to avoid unexpected economic losses due to their failures. To reduce the cost associated to its maintenance, a recent trend is the integration of diagnostic procedures in the electronic equipment that control the motor, such as variable speed drives (VSD)s. This paper presents a new methodology to detect rotor asymmetries and unbalanced contact resistances in IMs fed from VSDs, at standstill. The proposed approach is a non-invasive technique, can be executed on-line, and is not expensive because this method does not need extra hardware or additional sensors. Besides, the results of the proposed diagnostic method are presented in a very graphical and easy to understand way, alike to a dartboard, which makes it easily understandable by non-qualified personal maintenance. The proposed methodology is validated experimentally with a commercial induction motor with different rotors, both healthy and faulty.

• Publication Date: 19-Aug-2016
• DOI: 10.15224/978-1-63248-102-3-72
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