3.7.5.6 Radiant Cooling

90.1-2016 BM

This section describes a floor-based radiant cooling system and the inputs required.

 

Hydronic Tubing Length

Applicability

Floor-based radiant cooling systems

Definition

The length of the hydronic tubing in the slab

Units

ft

Input Restrictions

As designed

Baseline building

Not applicable

 

Hydronic Tubing Inside Diameter

Applicability

Floor-based radiant cooling systems

Definition

The inside diameter of the hydronic tubing in the slab

Units

ft

Input Restrictions

As designed, between a minimum of ½” and a maximum of ¾”

Baseline building

Not applicable

 

Temperature Control Type

Applicability

Floor-based radiant cooling systems

Definition

The temperature used for control (operative temperature, mean air temperature, mean radiant temperature, ODB, OWB

Units

None

Input Restrictions

Fixed at Mean Air Temperature for calculations

Baseline building

Not applicable

 

Rated Flow Rate

Applicability

Floor-based radiant cooling systems

Definition

The temperature used for control (operative temperature, mean air temperature, mean radiant temperature, ODB, OWB

Units

None

Input Restrictions

Fixed at Mean Air Temperature for calculations

Baseline building

Not applicable

 

Cooling Control Temperature

Applicability

Variable Flow Systems

Definition

The temperature used for control (operative temperature, mean air temperature, mean radiant temperature, ODB, OWB

Units

None

Input Restrictions

Fixed at Mean Air Temperature for calculations

Baseline building

Not applicable

 

Condensation Control Type

Applicability

Floor-based radiant cooling systems

Definition

The temperature used for control (operative temperature, mean air temperature, mean radiant temperature, ODB, OWB

Units

None

Input Restrictions

Fixed at Mean Air Temperature for calculations

Baseline building

Not applicable

 

Condensation Control Dewpoint Offset

Applicability

Floor-based radiant cooling systems

Definition

The temperature difference above dewpoint that is the minimum cold water supply temperature

Units

None

Input Restrictions

Fixed at 2°F above dewpoint

Baseline building

Not applicable

 

Rated Pump Power Consumption

Applicability

Floor-based radiant cooling systems

Definition

The rated pump power at design conditions

Units

Watts

Input Restrictions

As Designed

Baseline building

Not applicable

 

Motor Efficiency

Applicability

Floor-based radiant cooling systems

Definition

The pump motor efficiency

Units

Decimal fraction

Input Restrictions

As Designed

Baseline building

Default motor efficiency from Standard 90.1-2010 Table 10.8 (Table numbering may change) based on motor nameplate hp

 

Fraction of Motor Heat to Fluid

Applicability

Floor-based radiant cooling systems

Definition

Fraction of the heat from the motor inefficiencies that enters the fluid stream

Units

none

Input Restrictions

As designed. Default is 0.

Baseline building

Not applicable

 

Cooling High Water Temperature

Applicability

Floor-based radiant cooling systems

Definition

The high temperature used for control. If the water temperature is above the high temperature, the control temperature is set to the low control temperature.

Units

°F

Input Restrictions

As designed

Baseline building

Not applicable

 

Cooling Low Water Temperature

Applicability

Floor-based radiant cooling systems

Definition

The temperature used for control of the water temperature.  If the water temperature of the radiant cooling is below this temperature, cooling is disabled.

Units

°F

Input Restrictions

Fixed at 55°F

Baseline building

Not applicable

 

Condensation Control Type

Applicability

Floor-based radiant cooling systems

Definition

The simulation program may have a means of detecting when condensation is likely to occur on floor surfaces in the space.  When this occurs, the simulation can shut off the system to prevent condensation from occurring.

Units

List:  None, Simple, Variable

Input Restrictions

As designed

Baseline building

Not applicable