Calculation of comfort setpoint

File: ComfortSP.doc

Last edition: 2003-03-19

Author: Mikael Krantz

History: 2000-11-23/mikr First version.

2003-03-19/MK Updated to Menta 4.0

Description

Average outdoor temperature

The actual outdoor temperature is measured once every hour, added up, and the average outdoor temperature is calculated once every day at 7 o'clock (no adjustment for daylight saving time).

Running mean temperature

The Running mean temperature is calculated as:

TRM Running mean temperature

TDM Actual average temperature

TRMn = c.TDMn-1 + (1-c).TRMn-1

where the constant c is set default to 0.2.

Control temperature

If the running mean temperature is below 10 °C, the Control temperature is set to a fix value of 22.88 °C.

In other cases, the Control temperature is calculated as:

Tc = a * TRM + b

where

a = 0.302

b = 19.39

Inputs

(Real) Outdoor temperature, °C.

Outputs

(Real) Comfort setpoint, °C.

Parameters

(Real) TimeToCalculate 7

(Real) OutdoorLimit 10 °C

Public signals

(Real) AverageDayTemp

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