DEveloppement d'un capteur de puissance de compresseur virtuel A vitesse variable pour un systEme de conditionnement d'air A dEbit de frigorigEne variable
Development of a virtual variable-speed compressor power sensor for variable refrigerant flow air conditioning system
Abstract This paper proposed a universal virtual variable-speed compressor power (VVCP) sensor for VRF system based on 20-coefficient model. Compressor power can be obtained by the VVCP sensor using three input parameters (frequency, condensing temperature and evaporation temperature) which are measured by system itself. The performance of the proposed VVCP sensor is evaluated using experiments data. Experimental conditions include cooling, heating and non-standard refrigerant charge levels. The result shows that the mean square percentage errors (MSPE) are 9.9% under cooling conditions and 7.96% under heating conditions. The MSPE are 9.88% at steady state and 9.75% at dynamic state when the VVCP sensor is applied under nine different refrigerant charge levels. It demonstrated that the proposed VVCP sensor can obtain compressor power under cooling, heating and non-standard refrigerant charge levels, which could be applied to do operational monitoring and fault detection and diagnosis for VRF system at low cost. Highlights Compressor frequency has a strong impact on the compressor power. Condenser and evaporator temperature have a strong impact on the compressor power. The VVCP sensor is established using 20-coefficient method. The VVCP sensor shows good accuracy under cooling conditions and heating conditions. The VVCP sensor still has good performance under non-standard refrigerant charge levels.
Compressor power . Variable refrigerant flow . Virtual variable-speed compressor power sensor . Correlation coefficient analysis . 20-coefficient model . Puissance de compresseur . Débit de frigorigène variable . Capteur virtuel de puissance de compresseur à vitesse variable . Analyse du coefficient de corrélation . Modèle 20-coefficient.
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