MULTICAL® 803
Kamstrup A/S · Technical description · 5512-2360_A1_GB_02.2019
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7.2
Measurement of the coefficient of performance of a heat pump
7.2.1
Coefficient of Performance (COP)
In houses with heat pumps with one common heat circuit, it is expedient to measure both the released thermal
energy and the gained electrical energy, based on which the coefficient of performance (COP or CP) can be
calculated. COP is the abbreviation of ”Coefficient Of Performance”.
The calculation is based on simple proportional numbers between calculated thermal energy (E1) and the electrical
energy that is measured via pulse input B1 (In-B1):
𝐶𝐶𝐶𝐶
=
𝑇𝑇ℎ𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒
𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒
[
𝐸𝐸
1]
𝐸𝐸𝑒𝑒𝑒𝑒𝐸𝐸𝐸𝐸𝑒𝑒𝐸𝐸𝐸𝐸𝑒𝑒𝑒𝑒
𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒𝑒
[
𝐼𝐼𝑒𝑒𝐼𝐼𝐼𝐼𝐸𝐸
𝐵𝐵
1]
Electrical energy (In-B1) is registered in kWh or MWh, whereas thermal energy (E1) is either registered in kWh,
MWh, Gcal or GJ depending on the selected B code. No matter which unit you choose, the calculator calculates CP
correctly. The CP value is displayed with one decimal and is a value in the interval 0.0…19.9.
The CP value can be displayed as a current value, a monthly value or a yearly value (SCOP, Seasonal Coefficient of
Performance). In addition, the averaging period of the current CP-value as well as the current power measured at
input B can be displayed.
Current CP is averaged over a number of days and nights selected in the calculator’s configuration. The averaging
period can be selected in the interval 5…30 days. The averaging period is set to 7 days, unless otherwise stated by
the customer.
Note: If data of E1 or In-B1 are missing for a logging period, current CP is displayed as 0.0 until the data basis is
sufficient.
CP display readings
The table below shows the CP readings in the TECH loop.
Primary display Secondary
display
Display no.
Display reading
CP
(moving average)
2-023-00
Current power
of In-B1
2-023-01
Averaging period
of CP
2-023-02
Yearly date
2-023-03
Yearly data
2-023-04