Residential heating energy usage patterns under the COVID-19 pandemic in Korea Chihye Bae, Jae Yong Lee, Dongwoo Kim, Chungyoon Chun Indoor and Built Environment, 2025 This study examined the impact of the COVID-19 pandemic on residential heating energy consumption in South Korea, focusing on space heating and hot water production. Using data from smart meters and surveys in the Y Apartment Complex, the research analysed consumption patterns before COVID-19 (2019), during the early stages (2020) and the spread period (2021). The findings reveal significant variations in heating energy usage due to increased time spent at home and heightened hygiene awareness. During the spread period, there was a shift to consistent space heating throughout the day, with reduced night time heating and increased daytime and minimal control patterns compared to the pre-COVID-19 period. Hot water consumption was also increased overall, particularly in the early pandemic period, due to heightened hygiene awareness. Cluster analysis shows that households maintaining lower indoor temperatures pre-pandemic experienced higher consumption growth post-pandemic. Households with children and students had significantly higher increases in hot water usage. These findings enhance our understanding of the impact of COVID-19 on residential energy consumption and underscore the need for adaptive energy management strategies that can dynamically adjust practices in response to changes in occupant behaviour during significant social upheaval such as the pandemic.
Experimental study of flash tank injection on a heat pump system with a rotary compressor Acra 2016 8th Asian Conference on Refrigeration and Air Conditioning, 2016
A theoretical model for a gas injection heat pump used in electric vehicles Acra 2014 Proceedings of the 7th Asian Conference on Refrigeration and Air Conditioning, 2014
RECENT SCHOLAR PUBLICATIONS
Offline Reinforcement Learning for Optimal Control of a Greenhouse with Ground Source Heat Pump C Jang, D Kim, R Yun Energy, 141404 , 2026 2026
Field evaluation of a soft actor–critic-based control strategy for a centralized geothermal heat pump system D Kim, HJ Kim, H Tak, JY Lee Energy Conversion and Management 354, 121248 , 2026 2026
Interpretable probabilistic forecasting of building multi-energy loads using residual learning and global attention-enabled transformer: A case study for residential buildings … HJ Kim, D Kim, H Tak, JY Lee Energy and Buildings, 117424 , 2026 2026
Global-local attention-enabled multiple decoder Transformer for multi-energy load forecasting in user-level integrated energy system HJ Kim, D Kim, H Tak, JY Lee Applied Energy 396, 126255 , 2025 2025 Citations: 18
Empirical analysis of the demand-based heat supply system in district heating buildings D Kim, H Tak, JY Lee Applied Thermal Engineering 277, 127031 , 2025 2025 Citations: 8
Heat demand response of end users based on energy awareness level and energy-monitoring app usage D Kim, C Bae, JY Lee Journal of Building Engineering, 113721 , 2025 2025
Residential heating energy usage patterns under the COVID-19 pandemic in Korea C Bae, JY Lee, D Kim, C Chun Indoor and Built Environment 34 (7), 1422-1444 , 2025 2025 Citations: 1
Optimization of Centralized-Distributed cooperative heat pump systems for Performance, Costs, and environmental benefits in electrified buildings D Kim, JY Lee, H Tak, HJ Kim Applied Thermal Engineering 272, 126464 , 2025 2025 Citations: 6
Deep reinforcement learning-based residential building energy management incorporating power-to-heat technology for building electrification HJ Kim, JY Lee, H Tak, D Kim Energy 317, 134601 , 2025 2025 Citations: 15
Understanding Residents’ energy consumption Profiles: Behavioral segmentation analysis of heat energy consumption in Korean apartment residences C Bae, JY Lee, D Kim, C Chun Energy and Buildings 319, 114482 , 2024 2024 Citations: 12
A study on the impact of residents' energy usage behavior on heating energy consumption based on smart meter data and surveys C Bae, JY Lee, D Kim, C Chun Energy and Buildings 300, 113634 , 2023 2023 Citations: 18
Analytical study on changes in domestic hot water use caused by COVID-19 pandemic D Kim, T Yim, JY Lee Energy 231, 120915 , 2021 2021 Citations: 54
Energy performance evaluation of two-phase injection heat pump employing low-GWP refrigerant R32 under various outdoor conditions D Kim, DC Lee, M Lee, HJ Chung, Y Kim Energy 214, 119098 , 2021 2021 Citations: 28
Two-phase flow patterns and pressure drop of a low GWP refrigerant R-1234ze (E) in a plate heat exchanger under adiabatic conditions DC Lee, D Kim, S Yun, Y Kim International Journal of Heat and Mass Transfer 145, 118816 , 2019 2019 Citations: 36
Novel optimized operating strategies of two-phase injection heat pumps for achieving best performance with safe compression D Kim, S Myeong, D Cha, Y Kim Energy 187, 115925 , 2019 2019 Citations: 21
Evaporation heat transfer and pressure drop characteristics of R1234ze (E)/R32 as a function of composition ratio in a brazed plate heat exchanger DC Lee, D Kim, W Cho, Y Kim International Journal of Heat and Mass Transfer 140, 216-226 , 2019 2019 Citations: 37
Composite fouling characteristics of CaCO3 and CaSO4 in plate heat exchangers at various operating and geometric conditions KS Song, J Lim, S Yun, D Kim, Y Kim International Journal of Heat and Mass Transfer 136, 555-562 , 2019 2019 Citations: 74
Comparative thermal performance evaluation between ultrathin flat plate pulsating heat pipe and graphite sheet for mobile electronic devices at various operating conditions DS Jang, D Kim, SH Hong, Y Kim Applied Thermal Engineering 149, 1427-1434 , 2019 2019 Citations: 58
An experimental study on the evaporation heat transfer and pressure drop of R-1234ze (E) in a shell and plate heat exchanger CU Jo, DC Lee, D Kim, Y Kim 25th IIR International Congress of Refrigeration, ICR 2019, 474-479 , 2019 2019
극저온 지역난방시스템에서의 캐스케이드 열 공급에 대한 연구 이민우， 김동우， 이상헌， 이정훈， 김용찬 대한기계학회 춘추학술대회, 1935-1938 , 2018 2018
MOST CITED SCHOLAR PUBLICATIONS
Performance comparison between R410A and R32 multi-heat pumps with a sub-cooler vapor injection in the heating and cooling modes IY Cho, HJ Seo, D Kim, Y Kim Energy 112, 179-187 , 2016 2016 Citations: 111
Thermal comfort and energy saving in a vehicle compartment using a localized air-conditioning system MS Oh, JH Ahn, DW Kim, DS Jang, Y Kim Applied Energy 133, 14-21 , 2014 2014 Citations: 107
Evaporation heat transfer coefficient and pressure drop of R-1233zd (E) in a brazed plate heat exchanger DC Lee, D Kim, S Park, J Lim, Y Kim Applied Thermal Engineering 130, 1147-1155 , 2018 2018 Citations: 100
Performance comparison among two-phase, liquid, and vapor injection heat pumps with a scroll compressor using R410A D Kim, Y Jeon, DS Jang, Y Kim Applied Thermal Engineering 137, 193-202 , 2018 2018 Citations: 97
Flow patterns and heat transfer characteristics of flat plate pulsating heat pipes with various asymmetric and aspect ratios of the channels DS Jang, JS Lee, JH Ahn, D Kim, Y Kim Applied Thermal Engineering 114, 211-220 , 2017 2017 Citations: 83
Composite fouling characteristics of CaCO3 and CaSO4 in plate heat exchangers at various operating and geometric conditions KS Song, J Lim, S Yun, D Kim, Y Kim International Journal of Heat and Mass Transfer 136, 555-562 , 2019 2019 Citations: 74
Comparative evaluation of flow boiling heat transfer characteristics of R-1234ze (E) and R-134a in plate heat exchangers with different Chevron angles D Kim, DC Lee, DS Jang, Y Jeon, Y Kim Applied Thermal Engineering 132, 719-729 , 2018 2018 Citations: 73
Comparative thermal performance evaluation between ultrathin flat plate pulsating heat pipe and graphite sheet for mobile electronic devices at various operating conditions DS Jang, D Kim, SH Hong, Y Kim Applied Thermal Engineering 149, 1427-1434 , 2019 2019 Citations: 58
Effects of ejector geometries on performance of ejector-expansion R410A air conditioner considering cooling seasonal performance factor Y Jeon, J Jung, D Kim, S Kim, Y Kim Applied Energy 205, 761-768 , 2017 2017 Citations: 58
Performance characteristics of an R600a household refrigeration cycle with a modified two-phase ejector for various ejector geometries and operating conditions Y Jeon, S Kim, D Kim, HJ Chung, Y Kim Applied Energy 205, 1059-1067 , 2017 2017 Citations: 58
Optimization of the injection-port geometries of a vapor injection scroll compressor based on SCOP under various climatic conditions D Kim, HJ Chung, Y Jeon, DS Jang, Y Kim Energy 135, 442-454 , 2017 2017 Citations: 57
Analytical study on changes in domestic hot water use caused by COVID-19 pandemic D Kim, T Yim, JY Lee Energy 231, 120915 , 2021 2021 Citations: 54
Condensation heat transfer characteristics of R245fa in a shell and plate heat exchanger for high-temperature heat pumps J Lim, KS Song, D Kim, DC Lee, Y Kim International Journal of Heat and Mass Transfer 127, 730-739 , 2018 2018 Citations: 53
Comparative performance evaluation of self-humidifying PEMFCs with short-side-chain and long-side-chain membranes under various operating conditions D Cha, SW Jeon, W Yang, D Kim, Y Kim Energy 150, 320-328 , 2018 2018 Citations: 47
Evaporation heat transfer and pressure drop characteristics of R1234ze (E)/R32 as a function of composition ratio in a brazed plate heat exchanger DC Lee, D Kim, W Cho, Y Kim International Journal of Heat and Mass Transfer 140, 216-226 , 2019 2019 Citations: 37
Comparative performance evaluation of conventional and condenser outlet split ejector-based domestic refrigerator-freezers using R600a Y Jeon, D Kim, J Jung, DS Jang, Y Kim Energy 161, 1085-1095 , 2018 2018 Citations: 37
Two-phase flow patterns and pressure drop of a low GWP refrigerant R-1234ze (E) in a plate heat exchanger under adiabatic conditions DC Lee, D Kim, S Yun, Y Kim International Journal of Heat and Mass Transfer 145, 118816 , 2019 2019 Citations: 36
Performance evaluation of a gas injection CO2 heat pump according to operating parameters in extreme heating and cooling conditions HJ Chung, C Baek, H Kang, D Kim, Y Kim Energy 154, 337-345 , 2018 2018 Citations: 32
Energy performance evaluation of two-phase injection heat pump employing low-GWP refrigerant R32 under various outdoor conditions D Kim, DC Lee, M Lee, HJ Chung, Y Kim Energy 214, 119098 , 2021 2021 Citations: 28
Analysis of two-phase injection heat pump using artificial neural network considering APF and LCCP under various weather conditions D Kim, KS Song, J Lim, Y Kim Energy 155, 117-127 , 2018 2018 Citations: 26
