Correction Factors for external Heat Meters

Usually the solar panel is filled with glycol. Glycol has a lower heat capacity than water.

The correction factors of the heat power and energy are given in the next table:

Table 7.   Correction factors for heat power and energy for water meters

Glycol concentration

Heat capacity of the solar fluid

Correction factor for solar power and energy

POW-01 = 0

POW-02 = 0

Psolar = Pwater * 1

POW-01 > 0

POW-02 = 0

Psolar = Pwater * (POW-01 * CFglycol+(100 - POW-01)*CFwater)/100

CFglycol = POW-03  heat capacity of glycol

POW-01 = 0

POW-02 > 0

Psolar = Pwater * POW-02/4,187 (dependends on temperature)

POW-01 > 0

POW-02 > 0

Psolar = Pwater * POW-02/4,187


Psolar is the solar power; Pwater is the heating power of the external meter.

Cwater = 4,187 kJ/(kg·K) heat capacity water


The heat energy is the value connected at the input “TotSolEnergyIn” and is multiplied by the same correction factors as the heat power and displayed at the output “TotSolEnergy”.

Table 8.   Parameter List

Description

Value Range

Default Value

Unit

CFG-01: solar power calculation

0; 1 = using a flow signal

2 = external heat meters

0.. 2

1

1

POW-01: collector glycol concentration

0…100

50

%

POW-02: collector fluid heat capacity – cF

0…120

0

kJ/(kg·K)

POW-03:  glycol heat capacity at 0 °C

0…120

2,277

kJ/(kg·K)

CO2-01: kg of CO2 saved per kWh of fuel

0,00000...1,00000

0,310

Kg/ kWh