Abstract
In the international movement to combat the threat of climate change, the timely implementation of residential energy-saving practises is becoming an urgent issue. Because the number of apartments is increasing, we analysed data from home energy management systems (HEMSs) and data from questionnaire surveys of 309 households in a condominium. We focused on the seasonal variation in air-conditioning (AC) use in living-dining rooms to determine the tendency of energy use for heating/cooling related to the characteristics of flats, the profiles of residents, and energy-saving behaviours. In winter, 80% of residents mainly used gas floor heating rather than AC and 24% did not use AC in winter. In households where someone stays home for long hours, they prefer gas floor heating rather than AC in winter. These households also tend to engage in energy-saving behaviours to adjust the indoor thermal environment. There are several types of energy-saving lifestyles; therefore, effective energy-saving measures should be considered for both energy efficiency and the thermal comfort of residents.
Highlights
IntroductionGlobal recognition of the requirement for an effective and progressive response to the urgent threat of climate change led to the enactment of the Paris Agreement [1]
The reduction target for greenhouse gas (GHG) emissions became 26% by 2030 compared to that of 2013. This nationally determined contribution (NDC) included a reduction of 40% in the residential sector, which accounts for 14% of the energy consumed in Japan [3]
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Summary
Global recognition of the requirement for an effective and progressive response to the urgent threat of climate change led to the enactment of the Paris Agreement [1] This was unveiled at the Conference of Parties to the United Nations Framework Convention on Climate Change 21 (COP 21) held in 2015. The reduction target for greenhouse gas (GHG) emissions became 26% by 2030 compared to that of 2013 This NDC included a reduction of 40% in the residential sector, which accounts for 14% of the energy consumed in Japan [3]. To realise this NDC, the Japanese government has designed global warming countermeasures [4]. The approach for the residential sector includes methods to achieve higher energy-saving performances in buildings, the introduction of energy-saving appliances, including fuel cell cogeneration systems (CGS) for residences, and home energy management systems (HEMS)
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