Analyse de l'efficacite energetique par acquisition de donnees des recuperateurs de chaleur des eaux usees et du chauffage solaire de l'eau chaude domestique sur le site de Benny-Farm

The biggest solar heating system in Quebec's province is on Benny-Farm site. Unfortunately, the installation wasn't working for the research's period so it couldn't be studied. However, to measure with good accuracy and at low cost the solar radiation in the monitoring of a solar system, a new calibration method for photovoltaic pyranometers is presented. This new method is much simpler and polyvalent than other existing methods. It has decreased mean error by 91% and 94%, error's standard deviation by 25% and 17% and the measured solar power by 66% and 73% for the two tested pyranometers over a 15 days measuring period. This method could make possible a standard calibration by the pyranometer producer for a particular model.;Keywords. Solar heating, pyranometer, calibration, domestic hot water, drain water;The drain water heat recovery system (DWHRS) is gaining in popularity, but the configuration of these devices on Benny-Farm site has never been studied. The two buildings studied, CHANCE and CHBF, each have eight DWHRS on 24 apartments. Because the DWHRS are installed in parallel, the cold water flow is equally split on the eight DWHRS when there's a domestic hot water (DHW) demand. The DHW demand, the cold and preheated water temperatures have all been recorded every 1,5 minutes over 250 days. Although the DWHRS efficiency is well known in single family houses, differences are expected. First, chances of heat recovery on multiple DWHRS simultaneously are changing the efficiency. Also, the chances of recovering heat from batch flows (ex. bath) are increased. Finally, the heat transfer of the DWHRS with room air can modify the measure efficiency. The monitored data showed that impact of simultaneousness of DHW demand is not positive on the efficiency, but DHW demand frequency is with batch flow heat recovery. Finally, it has been demonstrated that the heat gain of preheated water with room air through the DWHRS and piping system is substantial. The measured efficiency over the summer period where cold water temperature is over 20°C is 12%. It seems that the increase of batch flow heat recovery compensate for the theoretical efficiency drop of this DWHRS configuration. From natural gas bills and monitored data, the recirculation heat loss is 50% of the DHW energy needs. Considering a 5% mortgage rate and 3% annual rise for natural gas, the return on investment without subsidy is 11,7 years for CHBF and 15,6 years for CHANCE. Even though this DWHRS configuration is good on the two studied buildings, more research is needed to identify the parameters that make this configuration a success.