Abstract
A ventilated window system enhanced by phase change material (PCM) has been developed, and its energy-saving potential examined in previous works. In this paper, the ventilation control strategies are further developed, to improve the energy-saving potential of the PCM energy storage. The influence of ventilation airflow rate on the energy-saving potential of the PCM storage is firstly studied based on an EnergyPlus model of a sustainable low energy house located in New York. It shows that in summer, the optimized ventilation airflow rate is 300 m3/h. The energy-saving of utilizing a ventilated window with PCM energy storage is 10.1% compared to using a stand-alone ventilated window, and 12.0% compared to using a standard window. In winter, the optimized ventilation airflow rate is 102 m3/h. The energy-saving of utilizing a ventilated window with PCM energy storage is 26.6% compared to using a stand-alone ventilated window, and 32.8% compared to using a standard window. Based on the optimized ventilation airflow rate, a demand control ventilation strategy, which personalizes the air supply and heat pump setting based on the demand of each room, is proposed and its energy-saving potential examined. The results show that the energy savings of using demand control compared to a constant ventilation airflow rate in the house is 14.7% in summer and 30.4% in winter.
Highlights
To decrease the high energy consumption of the building sector, especially from space heating/cooling, it is essential to adopt renewable energy and highly energy-efficient building equipment for both new and existing buildings
This paper proposes and examines different ventilation control strategies based on a low energy residential house built after the German passive house standard
The relatively hot ambient air is ventilated through the cool phase change material (PCM) energy storage before being supplied to the indoor room; by natural ventilation outdoor airflow through the ventilated windows (VW), heat accumulated in the window cavity is removed
Summary
To decrease the high energy consumption of the building sector, especially from space heating/. Diaconu [25] studied different occupancy patterns and ventilation strategies on the energy-saving potential of buildings with a PCM-enhanced wall system and found out that the occupant pattern, which is directly associated to the HVAC set point, has a big influence on the energy-saving potential Those occupancy patterns are based on the assumption that the building is one thermal zone with one function, and the ventilation strategies are quite simple, and the demand of the room is not considered in the ventilation strategies. The house is located in New York, US It includes the influence of different ventilation airflow rates as well as a demand control strategy on the energy-saving potential of the PCM energy storage. The energy consumption of the house with PCMVW is compared to the house with VW and SW under different ventilation airflow rates in summer and winter, respectively; the energy demand of the house with PCMVW under constant ventilation airflow rate is compared to it under demand controlled ventilation strategy
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