1. Czech Technical University in Prague, tywoniak@fsv.cvut.cz Jan TYWONIAK, Kateřina SOJKOVÁ Additional Installation of Mechanical Ventilation in a Campus Building – First Experiences

2. CURTAIN WALL March 2013 June 2013

3. U = 0,68 W/(m2K) opaque U = 0,19 glazing U = 0,5 (+ thermal couplings) U = 3,0 W/(m2K) opaque U = 0,6 window U = 4,0 CURTAIN WALL

4. HEAT LOSSES, HEAT GAINS Original New (2013) Difference [%] Specific transmission heat loss HT [W/K]1364360-74 Specific ventilation heat loss HV [W/K] full occupancy 550 0 Total specific heat loss H [W/K]1914910- 53 Heating load at winter design temperature (-13 °C) [kW] 6530- 53 Estimated heat gains [kW]14 0

5. HEATING OFF TEMPERATURES Number of persons per floor External air temperature for heating off [°C] No heat recovery With heat recovery (70 %) 60+10+5-8 120+6-6-13 ! Ventilation rate 25 m3/(h.pers.) Waste heat from local server Unrealistic consideration, fluctuating use,…

6. VENTILATION PROBLEM - EXAMPLE Small lecture room, 193 m3 /43 person max, real occupancy 30 A two windows fully opened 10 min B one window in tilted position

7. FLOOR PLAN

12. COMPONENTS

13. CONTROL Each lecture room separately controlled, balanced ventilation IP communication CO2 sensors, time schedule, manually, remote access

15. OBSERVATIONS

21. MONITORING

22. SERVER AND WASTE HEAT

23. USE OF WASTE HEAT

24. CONCLUSION High occupancy: different relation losses and gains Ventilation by fully opened windows not acceptable Mechanical ventilation as additional measure possible but limited Individual control, each seminar room No heating of ventilation air, no use of heating bodies Waste heat circuit in limited use (low heat demand) Observation: acceptance and comfort studies will be repeated Presented for education Intensive cooperation HVAC and construction needed Under preparation now: design of mechanical ventilation in other floors (air handling unit for 2 floors)