.BuildSysPro.Systems.HVAC.Production.HeatPump.FixedSpeed.HPHeatingAir2Water

Information

Air/water heat pump with fixed speed compressor - polynomial model adapted to variable time step

Hypothesis and equations

This is an air/water heat pump with on/off (intermittently controlled) operation (fixed speed) for the heating mode only.

The model is minimalist in terms of parameters to inform and is based on an empirical approach to determining the power in steady state according to indoor and outdoor temperatures conditions. The transitional regime is modelled using a time constant for the power supplied.

The start regulation is determined by the input Boolean "u" : TRUE the HP must be in operation and FALSE the HP must be stopped.

The HP operates in all or nothing. Start and stop phases are given by the associated control system. To protect the machine, it is common that minimum on and off times are defined (DtminOn and DtminOff), they intervene in internal control of the machine.

Bibliography

none

Instructions for use

Two parameter choices are possible:

1. Indication of nominal power and COP (warning, a too large a gap of these values with those by default could result in unreliable modelling of a real machine)
2. Indication of 3 operating points, the empirical model approach requires three operating points which delimit the model temperature range

Known limits / Use precautions

For empirical approach, pay special attention to the choice of operating temperatures range.

Degradation related to icing/de-icing is rather grossly given without dynamic (10% degradation of the power supplied for outside temperatures below 2°C).

Not suitable for variable speed.

Validations

Validated model according to air/air HP with TIL - Hubert Blervaque, Sila Filfli 02/2013

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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Hubert BLERVAQUE, Sila FILFLI, EDF (2013)
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Revisions

Benoît Charrier 05/2015 : Suppression des connecteurs T & m_flow.

Hubert BLERVAQUE (externe) 03/2021 (on version 3.4.0): adding a parametrization option on the water pump operation, see "PumpOperation"