Abstract
The study simulated and assessed a novel control algorithm for an innovative room-based ventilation system for renovated apartments. The novel system is a manifold of fans that connects to an air-handling unit to control the supply of airflow to each room in an apartment. The exhaust side has a 3-way damper to control the division of extract airflows. The simulation required demand-control of ventilation airflows in each room. This included CO2- and temperature-based control of supply to dry rooms and humidity- and temperature-based control of exhaust from wet rooms. The object-oriented software IDA-ICE includes a graphical interface for assembling the controls, which enabled custom simulations. The controls efficiently maintained sufficient air quality in each room and ensured balance of supply and exhaust. The room-based demand-controlled ventilation system achieved 74% savings in fan energy consumption relative to the reference constant air-volume system. The simulations indicated the need for less-resisting overflow vents in doorways to prevent infiltration heat loss when supplying bedrooms with greater airflow. Infiltration heat losses increased by 18% with closed doors despite the use of acoustic vents to assist overflow. Future measurements will aim to validate the demand-control algorithm and the performance of the novel system in real apartments.
Highlights
Many governments have targeted energy savings to reduce greenhouse gas emissions and limit anthropogenic climate change
The novel system is a manifold of fans that connects to an air-handling unit to control the supply of airflow to each room in an apartment
Infiltration heat losses increased by 18% with closed doors despite the use of acoustic vents to assist overflow
Summary
Many governments have targeted energy savings to reduce greenhouse gas emissions and limit anthropogenic climate change. Decentralised ventilation applies heat recovery in every zone or apartment, which reduces the need for ductwork This limits energy consumption due to frictional losses and limits the spread of smoke in case of fire. It enables renovation of single apartments, and it reduces the necessary time for planning and installation. This has motivated the development and application of air handling units (AHUs) that serve single apartments. These AHUs use all the conventional components of multi-dwelling AHUs, such as supply and exhaust fans, air filters and a heat exchanger, but in a smaller form.
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