User Manual

96
4.2.1. Procedure for meeting an efficiency class for BACS projects
Example: Single room store
The building contains an open single room store that is air conditioned using a central air handling
unit. Heating and cooling take place on the air side using heat exchangers (water-air).
Requirement: BAC class B
Approach
1. Relevant functions (e.g. 4.1) to the project are being marked in column 1 e.g. by coloring the cell.
2. Draw a line on the right-hand side for the required BAC class.
3. Select a processing function for each relevant function and the classification column (at a
minimum) must reach the required class. It is marked by an “X” in column 1.
Definition of classes
Residential Non residential
D C B A D C B A
AUTOMATIC CONTROL
4 VENTILATION AND AIR CONDITIONING CONTROL
4.1 Supply air flow control at the room level
0 No automatic control
X 1 Time control
2 Occupancy detection
4.2 Room air temp. control (all-air systems)
0 on-off control
1 variable control
X 2 Demand control
4.3 Room air temp. control (Combined air-water systems)
0 No coordination
1 Coordination
4.4 Outside air (OA) flow control
0 Fixed OA ratio/OA flow
1 Staged (low/high) OA ratio/OA flow (time schedule)
X 2 Staged (low/high) OA ratio/OA flow (occupancy)
3 Variable control
4.5 Air flow or pressure control at the air handler level
0 No automatic control
1 On off time control
X 2 Multi-stage control
3 Automatic flow or pressure control (without reset)
4 Automatic flow or pressure control (with reset)
4.6 Heat recovery control: icing protection
0 Without icing protection
X 1 With icing protection
4.7 Heat recovery control: prevention of overheating
0 Without overheating control
X 1 With overheating control
4.8 Free mechanical cooling
0 No automatic control
1 Night cooling
X 2 Free cooling
3 H,x- directed control