In the present work a new mathematical model using Matlab-Simulink has been realized. This model allows the simulation of an air conditioned space in a dynamic mode, and can evaluate both the accomplishment of the desired human comfort within the conditioned space and the variation of energy request due to different measurements of volume flow rate, as requested by legislation on non-residential buildings. The present model has been applied to a hospital room, but can be used for other types of buildings, as well. The HVAC system in the study uses external air supply, with both constant or variable flow rate, and includes three different ways of air treatment: heating and vapor humidification in winter, cooling and dehumidification in summer, and ventilation only, otherways. The model uses the calculation of external air flow rate, as requested by UNI-CTI 10339 and UNI-EN 13779 rules, in order to fulfill the control of indoor air quality. Moreover we have evaluated which are the best conditions to ensure the requested performances at the lowest energetic cost. Finally, the study estimated the energetic gain deriving from the installation of a cross-flow air-air heat recovery, and using carbon dioxide sensors within the conditioned space.
DYNAMIC SIMULATION OF HVAC SYSTEMS: EVALUATION OF ENERGY AND COMFORT PERFORMANCE IN HOSPITAL ROOMS
VALDISERRI, PAOLO;
2012
Abstract
In the present work a new mathematical model using Matlab-Simulink has been realized. This model allows the simulation of an air conditioned space in a dynamic mode, and can evaluate both the accomplishment of the desired human comfort within the conditioned space and the variation of energy request due to different measurements of volume flow rate, as requested by legislation on non-residential buildings. The present model has been applied to a hospital room, but can be used for other types of buildings, as well. The HVAC system in the study uses external air supply, with both constant or variable flow rate, and includes three different ways of air treatment: heating and vapor humidification in winter, cooling and dehumidification in summer, and ventilation only, otherways. The model uses the calculation of external air flow rate, as requested by UNI-CTI 10339 and UNI-EN 13779 rules, in order to fulfill the control of indoor air quality. Moreover we have evaluated which are the best conditions to ensure the requested performances at the lowest energetic cost. Finally, the study estimated the energetic gain deriving from the installation of a cross-flow air-air heat recovery, and using carbon dioxide sensors within the conditioned space.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
