Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
The term you are looking at is the room temperature. The subscript 'k' is the time step.
| | 2 | No.2 Revision |
The term you are looking at is the room temperature. temperature (as denoted by the 'r'). The subscript 'k' is the time step.
Edit: looking at this a bit more thoroughly I think the subscript 'k' is actually the target temperature for the space, although that isn't stated within the image you have linked it would make more sense.
