HCRV: Heating curve

Connecting thread

E

Description

TOaEf

pa

Effective outside temperature

Issued by the heating release algorithm HRA (FB113). Average of the present and low-pass filtered outside temperature. The outside temperature filter includes the fact that the room temperature's response to the outside temperature changes is delayed and attenuated.

TOa

pa

Outside air temperature

Must be interconnected only for wind compensation.

SpTR

pa

Room temperature setpoint

To be interconnected only for room temperature controls or pre-control for room heating groups. For these applications, the set heating curve always applies to the nominal room temperature setpoint of 20°C / 68 °F. Other room temperature setpoints must be defined via this input.

SrItyFil

pa

Solar radiation intensity filtered.

To be interconnected only with FILTER (FB127).

WdSpdFil

pa

Filtered wind speed.

To be interconnected only for wind compensation with HRA (FB113) or FILTER (FB127).

SpcTFl

pa

Setpoint corr.flow temp.

Correction of the flow temperature setpoint (e.g. by room controller).

SpTFlMax

pa

Max.flow temp.setpoint.

Maximum flow temperature setpoint.

Note: The following influences of the flow temperature setpoint must be considered, i.e. plant protection is limited.

SpTFlMin

pa

Min.flow temp.setpoint.

Minimum flow temperature setpoint.

Note: The following influences of the flow temperature setpoint must be considered, i.e. plant protection is limited.

TOaDsgn

pax

Design outside temperature.

Defined as per the planning data of the heating plant.

SpTFlDs

pa

Flow temperature setpoint for design outside temperature.

Defined as per the planning data of the heating plant.

TOaHi

pax

Outside temperature high.

Should be in the upper range of the outside temperatures during the heating period. The entered default value is limited internally so that the contributory point ([TOaHi] / [SpTFlHi]) is always to the right of the design point (TOaDsgn/SpTFlDs).

SpTFlHi

pa

Flow temperature setpoint for highest outside temperature.

Defined as per the planning data of the heating plant. The entered default value is limited internally so that the contributory point ([TOaHi] / [SpTFlHi]) is always to the right below of the design point ([TOaDsgn] / [SpTFlDs]).

ExpRad

pa

Radiator exponent

The higher [ExpRad], the stronger the breakpoint of the heating curve, i.e., the greater the deviation of the heating curve from the straight line.

Recommended setting for typical heating systems:

Radiators 1.3
Plate heaters 1.2 ... 1.3
Convectors 1.25 ... 1.45
Floor heating 1.1.

DTRSrNom

pa

Room temp. increase at nominal solar radiation.

Based on nominal conditions (nominal room temperature, design outside air temperature, solar radiation intensity = 0), if the solar radiation intensity increases to a nominal value of 1000 W/m² / 93 W/ft² and if no solar compensation were to take place.

If the input [SrltyFil] is interconnected and solar compensation is still not wanted, set [DTRSrNom] to 0.

DTRWdNom

pa

Room temperature drop at nominal wind speed.

Based on nominal conditions (nominal room temperature, design outside air temperature, wind speed 0), if the wind speed increases to a nominal value of 20 m/s / 4000 ft/min and if no wind compensation were to take place.

If the input [WdSpdFil] is interconnected and wind compensation is not wanted, set [DTRWdNom] to 0.

SlpeInit

pa

Slope initialization.

Effective only if interconnected to the adaptation block. Without adaptation block [SlpeInit] = 0 (default value).

Connecting thread

E

Description

SpTFl

a

Flow temperature setpoint

Defined by the heating curve. Comprises any corrections to include deviations of the nominal room temperature setpoint and for solar and wind compensation.

Slpe

a

Slope.

Output for use in subsequent blocks (e.g., in room temperature controller with slope-dependent gain).

SpcSrWd

a

Setpoint correction for solar radiation and wind.

TOaBp

a

Outside temperature at breakpoint.

Graphical output of the heating curve.

SpTFlBp

a

Flow temperature setpoint at breakpoint.

Graphical output of the heating curve.

TOaBase

a

Base point for outside temperature.

Graphical output of the heating curve.