Abstract
This study makes a novel attempt to analyse the effect of the bypass control and room control modes on ventilation energy saving in an 84 m2 housing unit, which is the most frequently constructed unit-type among newly constructed apartment buildings in Korea. A heat recovery ventilation system was installed. The fan power consumption was measured via field experiments and analyses were made for potential energy savings. Experiments to confirm the power-saving effect owing to the application of the room control mode were performed under the heat recovery and bypass modes, using three air flow rates (0.5, 1.0 and 1.5 ACH). Additionally, the annual energy saving based on the application of the mixed mode (both bypass and room control modes) was calculated. The results obtained showed that when the mixed mode was employed, ventilation energy saving up to 10.76%–16.56%, which is greater than that obtained using only the heat recovery mode, was realized. Additionally, compared with all-room-ventilation, 26.69%–61.84% of ventilation energy could be saved if the mixed mode was applied only to the living room.
Highlights
Building permit requests for the construction of residential apartment buildings accounted for approximately 72% of the total number of building permits that were applied for within the first half of in Korea [1]
The findings of this study indicate that a simple algorithm that can switch the heat recovery ventilation systems (HRVS) between the bypass control mode and the heat recovery mode based on temperature sensors, using occupants’ ventilation on-off system for each room as they do for the lights, would significantly reduce ventilation-associated energy consumption per year
An actual HRVS was installed in the 84 m2 type housing unit, which is the most common housing unit type among newly constructed buildings in Korea and the fan power consumption was measured using field experiments and potential fan energy savings were analysed
Summary
Building permit requests for the construction of residential apartment buildings accounted for approximately 72% of the total number of building permits that were applied for within the first half of in Korea [1]. According to the policy report of the Ministry of Land, Infrastructure and Transport in Korea, it is required that new apartments buildings that can accommodate 30 or more households, that are to be constructed as from 2025, should be designed as zero energy buildings with over 20%. Constructed buildings have low insulation levels, which result in a high rate of heat loss via the skin of the building, high heating and cooling energy consumption [3]. Recent buildings were constructed in compliance with new regulations regarding the thermal performance of the building skin. For this reason, the thermal performance of the buildings reach the level of a passive house of which airtightness is very high [4]. Owing to the introduction of heat recovery ventilation systems (HRVS) which minimise heat loss resulting from the inflow of outdoor air, energy loss from heating and cooling has further reduced [5], even though these HRVS require an additional power supply for the operation of the fan
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