G - Physics – 05 – D
Patent
G - Physics
05
D
340/124, 340/154
G05D 23/20 (2006.01)
Patent
CA 2008599
ABSTRACT OF THE DISCLOSURE Rooms in a building each have a heating, venti- lating and air conditioning system (HVAC), a room control unit having a temperature controller, and various sen- sors. The control unit monitors the presence of persons in the room, determines the season, sets back the temper- ature in an empty room by a variable amount which the HVAC can restore in a given time, and restores the tem- perature to the previous user request when the user returns but to a standard temperature if the user has newly checked in. An outside hallway panel briefly dis- plays, when interrogated by a maid, a person's presence. By monitoring maid requests, door status and maid activ- ity, the unit indicates on a room map whether the room is being cleaned, clean, or ready to rent. By establishing the heat loss/gain (lg) factor of a room with the HVAC off and comparing it with the time to heat or cool the room, HVAC failures are determined. By comparing a room's lg factor with those of its neighbours, room environment failures are determined. A fire alarm is displayed immediately if more than one unit or more than one sensor reports fire; otherwise a fire alarm display is delayed briefly to reduce false alarms. Fire spread- ing is displayed on a screen room map showing in red rooms over a certain temperature. For fire, the hallway panels indicate those rooms where a person is present.
Bereskin & Parr
Electronic Energy Control Inc.
Electronic Environmental Controls Inc.
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