Virtual Air Temperature Function for Room Thermostats Ondej

Virtual Air Temperature Function for Room Thermostats Ondřej NEHASIL, Jana HORVÁTHOVÁ, Alžběta DEDEROVÁ-KOHOUTKOVÁ, Martin KNY CTU in Prague, University Centre for Energy Efficient Buildings, Třinecká 1024, 273 43 – Buštěhrad, Czech Republic

Comfort. What does it mean? Download full paper at www. cesb. cz/19/8888 1174

Comfort. What does it mean? Source: http: //images. google. com/ Download full paper at www. cesb. cz/19/8888 1174

Thermal comfort § Comfort is extremely subjective quantity. § Thermal comfort is only a small part of overall comfort. § There is a lack of incentives in the workplace, that would make us happy and comfortable. § Subsequently we become more sensitive to quality of indoor environment, including thermal comfort. § People often complain about thermal comfort when something else is bothering them. Source: http: //www. phsc. co. uk/thermal-comfort-in-your-workplace/ Download full paper at www. cesb. cz/19/8888 1174

Thermal comfort: Objective or subjective? § State of the art on the scientific level: Connection between subjective feeling and objective measurement has been already discovered and described. § P. O. Fanger compiled thermal comfort equation and introduced Predicted Mean Vote (PMV). Download full paper at www. cesb. cz/19/8888 1174

State of the art on practical level § Equitherm regulation, thermostatic heads REGULATOR 21°C t_int t_ext Boiler a) b) c) d) ON/OFF t_w 0 -10 V Open. Therm TRV Radiator Download full paper at www. cesb. cz/19/8888 1174

State of the art on practical level § Equitherm regulation, thermostatic heads § Simple room thermostat THERMOSTAT Ekvi T t_ext t_w Boiler 21°C a) 0/1 Hystesis b) 0 -1 PWM c) 0 -1 continuous Radiator THERMOSTAT 21°C a) 0/1 Hysteresis b) 0 -1 PWM c) 0 -1 continuous Radiator Download full paper at www. cesb. cz/19/8888 1174

State of the art on practical level BMS: DDC/PLC Ekvi T IRC terminal 21°C IRC terminal § Equitherm regulation, thermostatic heads § Simple room thermostat § Building management system 21°C Bus communication t_ext a) 0 -10 V b) 2 x relay driver c) Bus communication Boiler a) b) c) d) ON/OFF t_w 0 -10 V Open. Therm Radiator Download full paper at www. cesb. cz/19/8888 1174

Our solution § Room thermostat operated in the means of thermal comfort. § Temperature setpoint is not set manually, but calculated using activity, clothing, expected thermal comfort and other user inputs. § Building and room properties such as thermal accumulation or air tightness are taken into account. § The mean radiation temperature is calculated in a simplified manner. Download full paper at www. cesb. cz/19/8888 1174

Working principle Sensors t/RH, ambient t Actual user setting CLO, MET, desired PMV t. SET calculation Thermostat, IRC, BMS, … Initial preset Thermal mass, U value, no. of openings… Download full paper at www. cesb. cz/19/8888 1174

A prototype of room thermostat Download full paper at www. cesb. cz/19/8888 1174

Thank you for your attention! Ondřej NEHASIL ondrej. nehasil@fsv. cvut. cz Scan QR or download full paper at www. cesb. cz/19/ 1174