3.7.5.4 Evaporative Condenser

90.1-2016 BM

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

DirectEFF

The direct stage effectiveness

Tdb

The entering air dry-bulb temperature

Twb

The entering air wet-bulb temVOperature

Tdirect

The direct stage leaving dry-bulb temperature

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