|
Evaporative Condenser Power |
|
|---|---|
|
Applicability |
Direct expansion systems with an evaporatively cooled condenser |
|
Definition |
The power of the evaporative precooling unit. This includes any pump(s) and/or fans that are part of the precooling unit. |
|
Units |
Watts |
|
Input Restrictions |
As designed |
|
Baseline Rules |
Not applicable |
|
Evaporative Condenser Effectiveness |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
|
Applicability |
Direct expansion systems with an evaporatively cooled condenser |
||||||||
|
Definition |
The effectiveness of the evaporative precooling unit for a condenser. Effectiveness is defined as follows: (Equation 3.7.5.3-4) $$DirectEFF=\frac{T_{db}-T_{direct}}{T_{db}-T_{wb}}$$ Where
|
||||||||
|
Units |
Ratio |
||||||||
|
Input Restrictions |
As designed |
||||||||
|
Baseline Rules |
Not applicable |
||||||||
|
Evaporative Condenser Operation Range |
|
|---|---|
|
Applicability |
Direct expansion systems with an evaporative cooled condenser. |
|
Definition |
The temperature range within which the evaporative condenser operates. Two values are provided: Tmaximum The threshold outside air dry-bulb temperature below which evaporative condenser operates. Tminimum The threshold outside air dry-bulb temperature above which evaporative condenser operates. |
|
Units |
Degrees Fahrenheit (°F) |
|
Input Restrictions |
As designed |
|
Baseline Rules |
Not applicable |
|
Evaporative Condenser Power |
|
|---|---|
|
Applicability |
DX systems with an evaporatively cooled condenser |
|
Definition |
The power of the evaporative precooling unit. This includes any pump(s) and/or fans that are part of the precooling unit. |
|
Units |
Watts |
|
Input Restrictions |
As designed |
|
Baseline Building |
Not applicable |
|
Evaporative Condenser Effectiveness |
|||
|---|---|---|---|
|
Applicability |
DX systems with an evaporatively cooled condenser |
||
|
Definition |
The effectiveness of the evaporative precooling unit for a condenser. Effectiveness is defined as follows:
Where: DirectEFF = The direct stage effectiveness Tdb = The outside air dry-bulb temperature Twb = The outside air wet-bulb temperature Tdirect = The direct stage leaving dry-bulb temperature (at the condenser inlet) |
||
|
Units |
Ratio |
||
|
Input Restrictions |
As designed |
||
|
Baseline Building |
Not applicable |
||
|
Evaporative Condenser Operation Range |
|
|---|---|
|
Applicability |
DX systems with an evaporatively cooled condenser |
|
Definition |
The temperature range within which the evaporative condenser operates. Two values are provided: Tmaximum = The threshold outside air dry-bulb temperature below which evaporative condenser operates. Tminimum = The threshold outside air dry-bulb temperature above which evaporative condenser operates. |
|
Units |
Degrees Fahrenheit (°F) |
|
Input Restrictions |
As designed |
|
Baseline Building |
Not applicable |
G3.2 New Construction/Major Alterations
Not applicable to the baseline.
G3.3 Minor Alterations
If applicable based on the scope of the alteration, model the baseline efficiency according to 90.1 2022 Tables 6.8.1-1, 7 as applicable.