Ecole De Technologie Superieure Research Articles

Innovation award for a past ieee industrial electronics society junior president [society news

Prof. Kamal Al-Haddad received the Innovation Award from the Ecole de Technologie Superieure of Montreal, Canada, for his invention (with coinventors Youssef Ounejjar and Luc-Andre Gregoire) “Multilevel Electric Power Converter,” U.S. Patent, US9,331,599 B2 (Figure 1). A technology transfer agreement was signed on 10 May with Ossiaco, Inc. The invention was licensed to industry for commercialization. The new patent introduced a five-level Packed U Cell converter (PUC5).

Experimental analysis of a direct expansion geothermal heat pump in heating mode

Abstract In this study, we present an experimental analysis of a direct expansion (DX) geothermal heat pump (GHP) installed in the Thermal Technology Center (TTC) of the Ecole de technologie superieure in Montreal. The residential heating system studied consists of three geothermal 30 m deep wells, which use R22 as refrigerant. During the test campaign, which ran over a one-month period in early spring, the coefficient of performance of the heat pump varied between 2.70 and 3.44, with a daily average of 2.87. The heating capacity reached a daily average of 8.04 kW, for a cooling water constant volumetric flow rate of 0.38 L s −1 . The mean the ground heat extraction rate from was 58.2 W m −1 . The tests performed helped to highlight a pressure drop coupled with a relatively large superheating revealing a flow rate mal-distribution in geothermal evaporators. The effects of some factors (condenser cooling water inlet temperature, condensing temperature, pressure drop in the evaporator, thermal properties of soil and grout) that affect DX system performance are also presented. Finally, a comparative study between the use of electricity and the DX heat pump as home heating source shows that the DX heat pump provides savings of approximately 70% over the electricity.

New anti-jamming technique for GPS and GALILEO receivers using adaptive FADP filter

Anti-jamming techniques to improve Global Positioning System (GPS) receiver's robustness have been mainly developed in military applications. None of civilian techniques can procure sufficient robustness against occasional or intentional jammers for civil GPS or GALILEO navigation receivers. The amplitude domain processing (ADP) filtering is a technique based upon Capon works and Neyman-Pearson theory. Several experiments concerning the ADP filtering have been considered at the 3DETSNAV division of LACIME laboratory at Ecole de technologie superieure (ETS), which have proved that the technique is reliable in order to eradicate powerful interference present in the spread spectrum signal. However, the results show that the ADP filter has a real limitation when submitted to multiple interference scenarios. This paper shows that working in the frequency domain is more efficient because jamming signals added to a white Gaussian noise are easier to detect and to attenuate when represented in the frequency domain. The present paper gives mathematical elements to complete the ADP theory in the frequency domain and presents the performances of an ADP in the frequency domain (FADP) filter simulated in a Matlab Simulink environment. The filter is tested with a signal composed of a GPS C/A code (Gold sequence) drowned in a white Gaussian noise in presence of one or several additional jammers (CWI, PWI, chirp). Several analyses are made upon the filter output (signal to noise ratio, attenuation and power spectral density measurements). The results of the analysis show that the FADP can eradicate any kind of jammers of 20 dB above white Gaussian noise. Correlation losses are measured; they are always under 0.5 dB. In the presence of one or two jammers, the performances of the FADP filter are better than those of the ADP filter. The FADP filter can procure up to 20 dB processing gain with a maximum of 10 dB loss on SNR in worse jamming scenario. When the number of jammers increases, the performances remain convenient, whereas the time-domain ADP filter becomes unable to be effective. In this paper, measurements are made with a number of jammers up to 15.