Condenser Water Loop
The Condenser Water Loop features a supply side with Cooling Towers, pumps, pipes, and control devices. The demand side may include chillers, heat exchangers, and WCPU cooling and heating coils. Cool water, generated by Cooling Towers through evaporation, is distributed by pumps to the demand side for efficient cooling and heating processes.
System
Min. Loop Temp.
Specify the Min. Loop Temp defines the maximum allowable temperature in Celsius for this loop.
Max Loop Temp.
Specify the Max Loop Temp., establishing the minimum allowable temperature in Celsius for this loop.
Load Distribution Scheme
Specify the Load Distribution Scheme, choosing from Optimal, Sequential Load, Uniform Load, Sequential Uniform PLR, and Uniform PLR. This scheme determines the algorithm for sequencing equipment operation to meet plant loop demand effectively.
Design Loop Exit Temp.
Specify the Design Loop Exit Temp., determining the water temperature in degrees Celsius at the exit of the supply side of the plant loop. This represents the temperature of the water supplied to the demand side of the loop.
Design Loop Temp. Difference
Specify the Design Loop Temp. Difference, indicating the design temperature rise (for cooling or condenser loops) or fall (for heating loops) in degrees Celsius across the demand side of a plant loop. This temperature difference guides component models in determining flow rates needed to meet design capacities.
Sizing
Sizing Option
Specify the Sizing Option, offering a choice between Coincident and Non-coincident. Coincident sizing triggers additional iterations, using coincident flow rates of each plant loop component to size the total loop flow rate. Non-coincident sizing sums up the component flow rates to determine plant loop flow rates.
Sizing Method
Specify the Sizing Method as Autosize or Manual. For Manual sizing, ensure all numerical fields are completed with valid entries.
Min. Loop Flow Rate
Specify the Min. Loop Flow Rate is a numeric field indicating the minimum loop flow rate in cubic meters per second.
Max. Loop Flow Rate
Specify the Max. Loop Flow Rate is another numeric field indicating the maximum loop flow rate in cubic meters per second. This parameter is utilized when the user opts to autocalculate the loop volume.
Plant Loop Volume
Specify the Plant Loop Volume, a numeric field indicating the volume of the plant loop in cubic meters. This encompasses both the demand and supply sides of the loop. This volume is crucial for loop capacitance calculation.
The autocalculate option sets the loop volume to the product of the Maximum Loop Flow Rate and the user-input Loop Circulation Time, defaulting to 2 minutes. A zero volume indicates no fluid heat capacity, while an excessively large capacitance may lead to unrealistic time delays and poor response to temperature setpoint changes.
Setpoint Manager
Setpoint Manager Type
Specify the Setpoint Manager Type, determining the control strategy for the supply side components on the loop. Choose between Constant or Follow Outdoor Air Temperature. Constant implies a steady hot water supply temperature, while Follow Outdoor Air Temperature means the condenser water supply temperature from Cooling Towers will vary based on outdoor wet bulb temperature, with user input for offset, minimum, and maximum temperatures.
Setpoint Manager Schedule Value
Specify the Setpoint Manager Schedule Value when the Setpoint Manager Type is Constant. This field sets the constant supply temperature for the output of the cooling towers on the condenser water loop.
Setpoint at Outdoor Low Temperature
Specify the Setpoint at Outdoor Low Temperature, relevant when the Setpoint Manager Type is Outdoor Air Reset. This field sets the supply air temperature setpoint in degrees Celsius at the outdoor low temperature for the first reset rule.
Outdoor Low Value
Specify the Outdoor Low Value, applicable with the Setpoint Manager Type as Outdoor Air Reset. This field indicates the outdoor air low temperature in degrees Celsius for the first supply air temperature reset rule.
Setpoint at Outdoor High Temperature
Specify the Setpoint at Outdoor High Temperature, applicable with the Setpoint Manager Type as Outdoor Air Reset. This field designates the outdoor air low temperature in degrees Celsius for the first supply air temperature reset rule, typically corresponding to the maximum supply temperature at this outdoor air temperature.
Outdoor High Value
Specify the Outdoor High Value, a field relevant when the Setpoint Manager Type is Outdoor Air Reset. This field represents the outdoor air high temperature in degrees Celsius for the first supply air temperature reset rule.
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