The following table describes the attributes used by the Heat Recovery Enthalpy Suitability Determination modules.
|
Name |
Type 1 |
Description |
Default Value |
|---|---|---|---|
|
Deadband |
Provides an input to make sure the return air and outdoor air conditions are different so that heat recovery operations are possible. |
5 °C, 10 °F |
|
|
Elevation |
Indicates the distance above or below sea level and is used for psychrometric calculations. |
0 ft, 0 m Display Precision: 1s |
|
|
Exhaust Air Temperature |
Exhaust air temperature. |
25 °C, 77 °F |
|
|
Heat Recovery Diff |
Heat recovery temperature suitability differential. Once heat recovery is suitable, the difference between Exhaust Air Temperature and OA Temperature must decrease by the Heat Recovery Diff value below the setpoint to make heat recovery unsuitable. |
1 °C, 2 °F |
|
|
Heat Recovery isAllowed |
Contains a network input that can be used to make heat recovery suitable or not suitable. True means heat recovery may be suitable and False means not suitable. |
True |
|
|
HR-AVAILABLE (Heat Recovery Suitability) |
G, V |
Used to determine whether the heat recovery is used for cooling control or heating control, or if the heat recovery is unsuitable for either control. |
Set Name: AHU HR Suit |
|
HRT-SP (Heat Recovery Setpoint) |
Contains the heat recovery temperature suitability setpoint. If the OA Temperature minus the Exhaust Air Temperature is greater than the Setpoint, Heat Recovery is suitable for cooling. If the Exhaust Air Temperature minus the OA Temperature is greater than the Setpoint, Heat Recovery is suitable for heating; otherwise, heat recovery is not suitable. |
6 °C, 11 °F |
|
|
Low Limit Process Variable |
Contains the low limit process variable that may be the glycol temperature in a glycol loop or the exhaust air leaving air temperature for an enthalpy wheel. The low limit process variable must be reliable for heat recovery to be suitable. |
7 °C, 45 °F |
|
|
OA Humidity |
Indicates the outdoor air humidity. |
45.0% RH |
|
|
OA Temperature |
Contains the outdoor air temperature. If the temperature difference between the exhaust air temperature and the outdoor air temperature is large enough, heat recovery may be suitable. |
25 °C, 77 °F |
|
|
Return Air Humidity |
Indicates the return air humidity. |
30.0% RH |
|
|
Return Air Temperature |
Return air temperature. |
25 °C, 77 °F |
|
|
Supply Fan Status |
Indicates the operating status of the AHU supply fan, where Running equals True and Off equals False. |
True |
|
|
Unit Set |
Indicates the units of measurement used at the site. |
SI, IP Set Name: Unit Set |