Reference : Simulation Based Assessment of Heat Pumping Potential in Non-Residential Buildings – Par...
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Engineering, computing & technology : Energy
Simulation Based Assessment of Heat Pumping Potential in Non-Residential Buildings – Part 1: Modeling
Bertagnolio, Stéphane mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Thermodynamique appliquée >]
Stabat, Pascal mailto [> >]
Soccal, Benjamin [> >]
Gendebien, Samuel mailto [Université de Liège - ULg > Département d'aérospatiale et mécanique > Turbomachines et propulsion aérospatiale >]
Andre, Philippe mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
Proceedings of the 10th REHVA World Congress - Clima 2010
10th REHVA World Congress - Clima 2010
du 9 mai au 13 mai 2010
[en] 1 Introduction
A solution to reduce the energy consumption in office and health care buildings consist in better exploiting the potential of the heat pump technology. This can be done by recovering heat at the condenser when the chiller is used to produce cold (simultaneous heating and cooling demands) or by using the chiller in heat pump mode (non-simultaneous heating and cooling demands). Both strategies appear particularly feasible when cooling and heating needs and the heat pump technology are, at least partly, present in the building, which is often the case in the tertiary sector. The analysis of these reversibility and recovery potentials is one of the subjects of the IEA-ECBCS Annex 48 project.

2 Simulation tools
A package of simulation tools is developed in order to assess the energy and environmental performances and costs of such solutions. A first tool allows a quick estimation of the potential of recovery and reversibility options, starting with limited information and using a limited amount of parameters. It consists in simulating the considered building and its secondary HVAC system in order to generate hourly values of heating and cooling system loads and to compute theoretical reversibility and recovery potentials. This first simulation run can be performed by mean of a calibrated building energy simulation tool (Trnsys, Energyplus…). Hourly values of heating and cooling loads of a given building can also be obtained through in-situ measurements.

A second tool allows to simulate the behavior of the heat pump plant and to compute its performances using the previously computed heating and cooling load profiles as inputs. The considered heat pump configuration is then compared to a classical HVAC primary system (composed of a boiler and a chiller) in terms of primary energy consumption, CO2 emissions and costs.

In this first paper, the development of such models and their implementation in an equation-based solver are described. The considered heat pump configurations are presented and the models of the main components (heat pump, boiler, thermal storage system, cooling tower and ground heat exchanger) are described. Five general configurations are considered: (1) reversible air-to-water heat pump, (2) exhaust air heat pump, (3) dual condenser heat pump, (4) water loop systems and (5) ground coupled heat pump. The modeling hypotheses, the control algorithms and the connection of these models into global heat pump systems simulation models are discussed. Finally, it is shown how simple equation-based simulation models can be connected to allow quick and robust assessment of the potential of complex heat pump systems.
Région Wallone de Belgique
IEA-ECBCS Annex 48
Researchers ; Professionals ; Students

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