modelHeatRecoveryVentilation
Information
Heat recovery ventilation with bypass for pure thermal modelling
Hypothesis and equations
The volume flow value can be prescribed or fixed throughout the simulation as well as the exchanger efficiency.
The enthalpy flow is defined based on the energy balance and heat exchanges between 2 air flows.
The main assumptions are:
- the air temperature is uniform in a zone: well-mixed assumption
- the air specific heat capacity is considered constant cp = constant
- the air density in a zone is constant: rho = constant
In addition the power consumption could be calculated. The default value correspond to 0.667 W/m3.h (insufflation and extraction fan).
Bibliography
none
Instructions for use
The conservation of mass in a thermal zone is imperative and is left to the user's care, otherwise the transfered work (PdV) can not be equal to zero.
By construction, this model can not ensure it. For example, for a thermal zone exchanging air with outdoor environment, two head-to-toe models should be used.
Similarly, this model can not be used alone for a single zone.
For more information refer to the user manual TF101 of CLIM2000.
Known limits / Use precautions
This model describes the heat transfer corresponding to the air renewal with heat recovery. This component is particularly important during heating periods. It can represent both an air renewal between a room and outside, and an air renewal between two rooms. For large temperature differences, prefer a pressure and temperature model.
Validations
Model validated - Gilles Plessis 02/2012
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Licensed by EDF under a 3-clause BSD-license
Copyright © EDF 2009 - 2023
BuildSysPro version 3.6.0
Author : Gilles PLESSIS, EDF (2012)
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Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Ventilation/infiltration | |||
| Boolean | use_Qv_in | false | Prescribed volume flow rate |
| Real | Qv | 0 | Constant volume flow rate for ventilation [m3/h] |
| Heat recovery | |||
| Boolean | use_Efficacite_in | false | Prescribed efficiency |
| Real | Efficacite | 0.5 | Constant efficiency [0-1] |
| Electric power consumption | |||
| Boolean | use_Pelec | false | Compute power consumption |
| Real | Pelec_spe | 0.667 | Specific power consumption for ventilation [W/m3.h] |
| Air properties | |||
| Modelica.Units.SI.Density | rhoair | 1.24 | Air density |
| Modelica.Units.SI.SpecificHeatCapacity | Cp | 1005 | Air specific heat capacity |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Blocks.Interfaces.RealInput | Qv_in | Prescribed air flow rate[m3/h] | |
| Modelica.Blocks.Interfaces.RealInput | Efficacite_in | Prescribed efficiency [0-1] | |
| Modelica.Blocks.Interfaces.BooleanInput | Bypass | True : Bypass / False : no Bypass | |
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_a | port_a | ||
| BuildSysPro.BaseClasses.HeatTransfer.Interfaces.HeatPort_b | port_b | ||
| Modelica.Blocks.Interfaces.RealOutput | PelecVentil | Puissance électrique de ventilation (W) |
Revisions
Benoît Charrier 12/2015 : Ajout du calcul de la puissance électrique liée à la ventilation, activable depuis un booléen. La puissance calculée est accessible pour les deux modes : débit commandé ou non.