Mullions Heating/Cooling Systems
The intelligent Workplace (IW) uses heated/cooled mullions as the heating/cooling source in the winter/summer. The mullions heating and cooling system is based on the German Patent Titled, “Integrated Façade System Gartner”. The advantage of incorporating this system of heating and cooling the space are enhanced comfort level and quiet operation. The hot water produced by the heat exchanger in the basement is circulated between the mullions and the heat exchanger by the water pumps in winter. In summer, the chilled water supplied by the campus loop is circulated between the water mullions and the water pump. There is another 33-gpm mullion pump located on the fourth floor to provide additional pressure to overcome the head loss in the mullion system.
There are 26 groups of mullions in the IW. Each group had 4-5 mullions controlled by one control valve and a flow rate meter. The mullion pump currently runs at about 26 gpm (max – 32gpm) during daytime schedule.
Components of the mullion heating/cooling System
Device type |
Analog Sensor – 100 |
Device ID |
Return water temperature sensor |
Manufacturer |
Siemens |
Model |
1 – ½ inch (3.8 cm) sensor with clamps |
Part Number |
540-258 |
Installation date |
03/2011 – 04/2011 |
|
|
Device type |
Valve |
Device ID |
By-pass valve |
Manufacturer |
Johnson controls |
Model |
M9000-5000 |
Part Number |
N/A |
Installation date |
1997/1998 |
|
|
Device type |
Control valve |
Device ID |
M X - VLV |
Manufacturer |
N/A |
Model |
N/A |
Part Number |
N/A |
Installation date |
1997/1998 |
Thermistor
