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2026
4

Participation in 2026 AIK Spring Conference

Location : aT center, Seoul

Presented paper

2026 AIK Spring Conference
2026/05/16
Conferences
Professor Shukuya visited Chonnam National University for a week. We discussed ways to develop refrigerant cycle modeling by considering heat loss from piping and compressors.
We also explored how to analyze the exergy efficiency of each heat pump subsystem. Through these discussions, we were able to deepen our understanding of the true meaning of exergy analysis in heat pump systems.
Collaborative research with Prof. Shukuya in Korea
2026/04/14 → 2026/04/18
Activity
We conducted a series of research meetings and seminars in Japan with prof. Shukuya, prof. Kayo, and the Tokyo city university research group. The visit included intensive sessions at Hosei university and Tokyo city university to advance collaborative research on heat pump thermodynamic modeling and ground source heat pump exergy analysis.
The technical focus was the refinement of an air source heat pump boiler model, specifically incorporating superheating at the compressor inlet and subcooling at the condenser outlet to reflect realistic operational strategies and equipment protection. We also discussed integrating solar thermal collectors (stc) through two configurations: mains water preheating with variable tank level control and tank water circulation.
This visit provided a valuable opportunity to experience the complete logic of heat pump algorithms firsthand. The insights gained will serve as a vital foundation for enhancing our lab's future research directions
Collaborative research with Hosei university and Tokyo city university
2026/01/15 → 2026/01/30
Activity
On January 7, 2026, our lab hosted a seminar with Prof. Moonkeun Kim at Chonnam National University. The session covered global trends in refrigerant regulations, technical challenges in heat pump systems, and a comparative analysis of HVAC cultures between Korea and Europe, specifically Norway.
The discussion highlighted the divergence in refrigerant policies, noting Europe's strict F-gas phase-out favoring natural refrigerants like CO2 and propane, contrasting with the continued reliance on mixed refrigerants in the US and Asia.
Prof. Kim provided technical feedback on our Python-based simulation modeling for air source heat pump boiler model. He emphasized the necessity of validating boundary conditions—such as domestic hot water usage and ground temperatures—against literature and simplifying simulation scenarios to ensure logical consistency.
The key takeaway was the importance of considering the "well-to-wheel" environmental impact of electrification within Korea's specific energy mix and the need for system modularization to improve installation feasibility in domestic environments.
Seminar on refrigerant trends and heat pump systems with Prof. Moonkeun Kim
2026/01/07
Activity
2025
16

Participation in 2025 SAREK winter conference

공기열원 히트펌프의 연간 에너지 및 엑서지 효율 분석 presented by Habin Jo

Presented papers

2025 SAREK winter Conference
2025/11/28
Conferences

Participation in 2025 Autumn KIAEBS Conference

Location : Chungbuk National University, Cheongju

Presented papers

2025 KIAEBS Autumn Conference
2025/11/14
Conferences

Participation in 2025 KSGHE Autumn Conference

Location: Pusan national university, Pusan
토양 열저항의 변화를 고려한 지열히트펌프 보일러의 엑서지 분석 presented by Habin Jo

Presented papers

by Habin Jo
2025 KSGHE Autumn Conference
2025/11/03
Conferences
We invited Professor Shukuya to Chonnam National University for a week to collaborate with us.
During his visit, we held intensive discussions on the exergy balance equation of the refrigerant cycle at each state point. We also discussed the exergy balance of a photovoltaic panel system, considering the efficiency of subsystems like the controller, DC/AC converter, and battery.
Additionally, Professor Shukuya gave a seminar for graduate students on the topic, ‘How the exergy concept can be applied in the built environment’. The seminar provided valuable insights, helping to shift our perspective from purely energy-centric thinking to a more comprehensive approach considering both energy and exergy.
Collaborative research with Prof. Shukuya in Korea
2025/10/22 → 2025/10/29
Activity
This forum addressed the next steps for green buildings in achieving carbon neutrality, moving beyond conventional methods to explore new technological shifts. The discussions highlighted Korea's significant dependence on imported energy and the limitations of current solutions like hydrogen fuel cells, which face challenges with economic viability and emissions. The central theme was overcoming the shortcomings of traditional Building Energy Management Systems (BEMS), which are often underutilized due to complexity and a lack of expert staff.
Researchers introduced a transformative approach using advanced AI, centered on neuromorphic (brain-inspired) AI to analyze basic electrical patterns from distribution panels, allowing the system to infer building activity without costly sensors. This is paired with federated learning, a technique that trains a central AI model without compromising the data privacy of individual buildings.
Practical case studies grounded these futuristic concepts, demonstrating that even simple, occupant-involved control strategies could significantly reduce gas use. The forum's key takeaway was the clear shift toward creating autonomous, intelligent energy management systems. The vision is for AI agents to act as digital "facility managers," solving persistent real-world problems of high implementation costs and the shortage of specialized personnel.
The 2nd Green Building Future Forum 2025
2025/09/11
Activity
Location: Resom Resort, Jecheon, South Korea
Opening address at the workshop
This workshop gathered experts to advance Korea's policies on green remodeling for public buildings. The core focus was on developing more practical and effective standards for improving energy efficiency in existing buildings.
The discussion session was active with relevant experts
Discussions revolved around moving beyond simple metrics to more accurately evaluate a building's actual energy performance. Participants also addressed common real-world challenges, such as the difficulty of collecting reliable energy data.
A key takeaway was the collective agreement on shifting focus from design-based predictions to measuring actual, operational energy savings after a project is completed. The event underscored that successful green remodeling depends on the synergy of sound policy, reliable data, and expert collaboration.
Workshop on Public Green Remodeling Policies and Research
2025/09/03 → 2025/09/04
Activity

Participation in 2025 COBEE conference

Location : Eindhoven university of Technology, Netherland
Exergetic Comparison of DHW Systems: Electric, Gas, and Heat Pump Boilers presented by Habin Jo

Presented papers

2025 COBEE Conference
2025/07/08
Conferences
During our visit to the Technical University of Denmark (DTU), we observed various experimental systems. Particularly notable was a ceiling-mounted radiant panel, where each section can be independently controlled by a working fluid circulating through internal pipes.
Ongun, an Associate Professor at DTU, explains to Habin how the radiant panel works.
An Exergetic Evaluation of Building Systems: A Case Study of Heat Pumps and Solar Assisted Water Heaters presented by Habin Jo
Privacy-Preserving AI for Buildings: Transfer Learning Framework Using Anonymized Energy Data by Wonjun Choi
We were also given the opportunity to present our research to DTU researchers, leading to an active discussion on the presented topics
Visit to Technical University of Denmark
2025/07/02
Activity

Participation in 2025 SAREK Summer Conference

Location: Alpensia Resort, Pyeongchang
Suhyun, Prof. Wonjun and Habin
태양열 보조 급탕 시스템의 엑서지 성능 분석 presented by Habin Jo
토양 열저항의 시간 변화를 고려한 지열교환기 엑서지 분석 presented by Suhyun Park

Presented Papers

by Habin Jo
by Suhyun Park
2025 SAREK Summer Conference
2025/06/18 → 2025/06/20
Conferences
We are thrilled to announce that Suhyun Park has been selected as one of only 50 recipients nationwide for the prestigious Graduate School Presidential Science Scholarship!
This remarkable achievement is a testament to her dedication and hard work.
Congratulations on this well-deserved recognition!
Suhyun Awarded Graduate School Presidential Science Scholarship
2025/06/05
Awards and Honors

Participation in 2025 AIK Spring Conference

Location : Global Education Center for Engineers, Seoul National University

Presented paper

2025 AIK Spring Conference
2025/05/02
Conferences

Participation in BRL Kickoff Meeting

Location : G&R Hub, Chonnam National University
Group of researcher from the BRL
We are launching a follow-up research project under the BRL (Basic Research Laboratory) program, which will run for the next three years starting from March 2025.
The main theme of this BRL follow-up research is Integrated design and operation framework for Geo-TABS using energy geo-structures.
Before officially starting the research, we held a kickoff meeting at G&R Hub to discuss the overall direction and key goals of the project.
2025 BRL Kickoff Meeting
2025/04/04
Activity
We visited Tokyo City University for two weeks to collaborate with Prof. Shukuya on modeling domestic hot water systems.
During the visitation, we discussed how to divide domestic hot water system into subsystems and how to develop physical model equations. Additionally, we deliberated on methods to reduce exergy consumption and explored the potential application of renewable energy sources to domestic hot water systems based on the results of the exergy analysis.
It was a valuable opportunity to experience the entire process of energy system analysis. The topics we discussed during the visitation will serve as a foundation to enhance our future research directions.
Collaborative research with Prof. Shukuya and Prof. Kayo
2025/01/08 → 2025/01/22
Activity
2024
7

Participation in 2024 ASim conference

Location : Osaka university nakanoshima center, Japan
Comparison of pseudo unsteady-state and fully unsteady-state thermal exergy analyses for internally and externally insulated building envelopes presented by Habin Jo

Presented papers

2024 ASim Conference
2024/12/13
Conferences

Participation in 2024 SAREK Winter Conference

Location : The Korea Science and Technology Center, Seoul
준 비정상상태와 완전 비정상상태 엑서지 분석법의 비교: 내단열과 외단열 건물 외피에 대한 사례 연구 presented by Habin Jo
공기열원 및 지열원 히트펌프의 냉방운전 엑서지 성능 비교 presented by Suhyun Park
비지도 대조학습 시계열 인코더를 이용한 전이학습: 소스 데이터셋 선택에 따른 예측 성능 변화 presented by Wonjun Choi
Suhyun, Ahyeon, Prof. Wonjun and Habin

Presented papers

by Habin Jo
2024 SAREK Winter Conference
2024/11/29
Conferences

Participation in 2024 Autumn KIAEBS Conference

Location : Jeju National University, Jeju
준 비정상상태와 완전 비정상상태 엑서지 분석법의 시공간적: 열확산계수와 시스템 길이에 따른 적절성 분석 presented by Habin Jo
미국 에어비앤비 리뷰를 활용한 실내환경품질 분석 presented by Suhyun Park
데이터 프라이버시 보호를 위한 익명화된 시계열 데이터 기반의 전이학습 프레임워크 개발 presented by Wonjun Choi
단체사진 좌측부터 (조하빈, 최원준, 고아현, 박수현)

Presented papers

by Habin Jo
2024 KIAEBS Autumn Confernece
2024/11/15
Conferences

Excellent presentation paper by The Society of Air-conditioning and Refrigerating Engineers of Korea (SAREK)

We received the Excellent Presentation Paper Award at the 2024 Summer Conference of the Society of Air-conditioning and Refrigerating Engineers of Korea.
Congratulations!

Awarded Paper

•
by Sieun Kim
Excellent presentation paper award at the summer conference of SAREK 2024
2024/06/21
Awards and Honors
We are delighted to announce that Habin Jo has been selected as a recipient of the National Research Foundation's Master's Student Research Grant. This recognition reflects his exceptional talent and dedication.
Congratulations, Habin!
Habin Awarded Master's Student Research Grant (National Research Foundation)
2024/03/29
Awards and Honors
We visited Tokyo city university and had a meeting with professor Shukuya for about 20 days.
We discussed how to simplify from the complex building model to the simple RC(Resistance capacitance) model to get insight before the main modeling by simulating the simplified model.
By deriving the energy balance equation from the physical model and solving it using matrix calculations, we were able to understand the overall process of RC model numerical calculation.
We discussed thermodynamics, heat exchange between fluid and pipe, thermodynamic limit temperature, and so on.
We also took the lectures on the role of HVAC systems from a perspective, which gave us the insights to interpret them from an exergy perspective.
International collaborative research with Prof. Shukuya
2024/01/15 → 2024/02/04
Activity
2023
19

Participation in 2023 SAREK Winter Conference

Location : The Korea Science and Technology Center, Seoul
외피 단열재 위치에 따른 동적 정상상태 엑서지 분석법의 적절성 presented by Habin Jo
복사와 대류 엑서지 전달을 고려한 건물 외피에 대한 계절별 비정상상태 엑서지 분석 presented by Sieun Kim

Presented papers

by Sieun Kim
by Habin Jo
2023 SAREK Winter Conference
2023/11/27
Conferences

Participation in 2023 Autumn KIAEBS Conference

Location : Pusan National University, Busan
지열교환기 설계 파라미터 불확실성에 기인한 지열교환기 출구 유체 온도 변동성 분석 presented by Yoonseong Kim
균일 물질의 열확산계수 및 시스템 길이에 따른 동적 엑서지 분석법의 적절성 검토 presented by Habin Jo

Presented papers

by Habin Jo
by Yoonseong Kim
2023 KIAEBS Autumn Conference
2023/11/10
Conferences
Excellent presentation paper award at the autumn conference of KIAEBS 2023

Participation in 2023 KSES Autumn Conference

Location : Sono Calm Convention Center, Yeosu
Prof. Wonjun, Student Euntak, Sieun and Suhyun
전역 민감도 분석 기반의 지열교환기 설계 길이 불확실성 분석 presented by Euntak Shin
복사와 대류를 고려한 건물 외피에 대한 비정상상태 엑서지 분석 presented by Sieun Kim

Presented papers

by Euntak Shin
by Sieun Kim
2023 KSES Autumn Conference
2023/11/07
Conferences

Participation in 2023 Autumn KSGHE Conference

Location: Chosun University, Gwangju
ASHRAE 지열교환기 설계법에 대한 전역 민감도 분석 Euntak Shin
토양 열응답 함수 불확실성에 의한 지열히트펌프 입구 유체 온도 변화의 확률론적 분석 Yoonseong Kim
The latest research trends and technological advancements in the geothermal and hydrothermal fields were actively shared at the 2023 KSGHE Autumn Conference. There were a total of 33 oral presentations and 43 poster presentations.
Me and Yoonseong presented in the Ground Source Heat Pump session. It was a unique experience because we had previously presented in the same session with other researchers in same field at another conferences like SAREK.
In the past, I couldn't fully concentrate on the presentations of other researchers in the same field because of nervousness about my upcoming presentation. However, meeting them again in the same session made me more focused on their research methodologies and directions.
Moreover, I felt that I could learn more about the aspects I didn't know through the presentations of others.
2023 KSGHE Autumn Conference
2023/10/12
Conferences
A new paper titled, has been published in Energy and Buildings.

Paper link

Summary

Data-driven time-series forecasting models for model predictive control of building energy systems have an autoregressive structure that accepts historical data as input. One customary practice is to encode the past 24 h of data to extract daily periodicity information when forecasting 24 h ahead. However, deep learning models have different forecasting mechanisms than traditional time-series models that decompose periodicity. This study focuses on the impact of encoding length in deep learning models used for building energy demand forecasting.
To investigate this, we developed an interpretable deep learning model using an attention mechanism and gated recurrent units. We tested three different encoding lengths: 8 hours, 24 hours, and 168 hours for 24-h-ahead forecasting of zone temperatures and loads.
Interpretable deep learning model for load and temperature forecasting: Depending on encoding length, models may be cheating on wrong answers
2023/08/11
Papers
A new paper titled has been published in Case Studies in Thermal Engineering.

Paper link

Summary

This paper presents a novel real-time probabilistic estimation method for determining the thermal properties of backfill material used in underground power transmission lines and ground heat exchangers. The proposed method combines a fast linear analytical model, Bayesian inference, and Jensen-Shannon divergence to enable real-time sequential estimations during field experiments, quantify the estimation uncertainty, and determine the estimation convergence. The method can capture the contextual information affecting the estimation uncertainty, such as the quality of the experiment and the construction state of the backfill. Thus the application of the developed estimation method can lead to significant cost savings by avoiding unnecessary and prolonged experiments.
Real-time probabilistic backfill thermal property estimation method enabling estimation convergence judgment
2023/06/27
Papers
Excellent presentation paper award at the summer conference of SAREK 2023

Participation in 2023 SAREK

Location : YongPyong resort, Pyeongchang
건축재료의 열확산계수와 시스템 두께에 따른 동적상태와 비정상상태 엑서지 분석법 비교 presented by Habin Jo
복사와 대류를 고려한 건물 외피에서의 비정상상태 엑서지 분석 presented by Sieun Kim
건물 도메인을 포함한 설계 파라미터들의 불확실성이 지열교환기 설계 길이 불확실성에 미치는 영향 분석 presented by Euntak Shin
다양한 지열교환기 클러스터의 열응답 함수 불확실성에 관련된 변수 기여도의 시간적 변화 분석 presented by Yoonseong Kim
From 21 to 23 June 2023, Euntak, Yoonseong, Habin and Sieun had the opportunity to present our paper at the YongPyong Resort in Pyeongchang.
Through this academic presentation, we were able to participate in various knowledge sharing and discussions on building energy use and energy-efficient equipment technologies. It was an opportunity to broaden our knowledge by sharing opinions with various people, not only academics but also those who are working in the field.
2023 SAREK Summer Conference
2023/06/21 → 2023/06/23
Conferences

Participation in 2023 IAQVEC

Location : Tokyo Big Sight, Japan
Uncertainty quantification of borehole heat exchanger design length based on a global sensitivity analysis, presented by Euntak Shin
Comparison of dynamic and unsteady-state exergy analyses for materials with different thermal diffusivities presented by Habin Jo
Euntak and Habin had an opportunity to present their academic papers on building energy usage and techniques for the built environment at Tokyo Big Sight during the period of May 20th to 23rd, 2023. This international event offered a diverse range of building physics-related topics, providing a unique platform for knowledge exchange and constructive discussions beyond traditional academic conferences. This presentation opened up new perspectives and insights related to their area of expertise.

Presented papers

by Euntak Shin
by Habin Jo
2023 IAQVEC Conference
2023/05/20 → 2023/05/23
Conferences
Location: Institute of Industrial Science, The University of Tokyo
The IEA Annex 87 meeting was held at the Institute of Industrial Science in Tokyo univ. The topic of Annex 87 was Energy and indoor environmental quality performance of personalized environmental control systems (PECS). During the meeting, the subtask leaders presented their advancements and findings in their subtask. The participants engaged in discussions and shared feedback actively.
Throughout the meeting, it helped to understand the requirements, standards, and guidelines for PECS can vary greatly depending on the use of the building. It was also informative to know about the different technologies required to achieve PECS.
IEA Annex 87 Expert Meeting
2023/05/19
Activity
Location: Institute of Industrial Science, The University of Tokyo
The IEA Annex 37 meeting was held at the Institute of Industrial Science at Tokyo univ. The topic of Annex 37 was Smart Design and Control of Energy Storage Systems. During the meeting, the subtask leaders presented and shared updates on their respective subtasks and actively participate in discussions and feedback.
The meeting provided insights into the energy storage systems, with a particular emphasis on demand-side management strategies. Through Annex 37, helped an understanding of the utilization of phase change materials (PCMs) as a solution for energy storage systems.
After the meeting, we had a tour of the laboratory equipment.
IEA Annex 37 Expert meeting
2023/05/18
Activity

2023 Spring Conference of Architectural Institute of Korea

Date: 2023.04.26 ~ 2023.04.28
Location: BEXCO Exhibition Center 2, Haeundae, Busan
Prof. Wonjun Choi, student Euntak, Yoonseong, and Habin presented at the Spring Conference held at BEXCO Exhibition Center 2 (Haeundae, Busan) from April 26 (Wed) to 28 (Fri), 2023.
전역 민감도 분석을 이용한 지중열 교환기 설계 길이의 불확실성 산정 presented by Euntak Shin
전역 민감도 분석을 활용한 토양 열응답 함수 관련 변수의 시간에 따른 기여도 변화 분석 presented by Yoonseong Kim
열확산계수가 다른 균일물질에 대한 동적 엑서지 분석법과 비정상상태 엑서지 분석법의 비교 presented by Habin Jo
2023 AIK Spring Conference
2023/04/26 → 2023/04/28
Conferences
A new paper titled, has been published.

Paper link

Summary

Buildings and their energy systems are characterized by unique and complex features that can evolve over time. Moreover, building data is highly seasonal, which means that it is subject to variations according to the time of the year. Therefore, an effective deep learning model with exceptional adaptability (i.e., high performance with little data) is required to accurately forecast and control the energy systems of buildings.
Performance evaluation of deep learning architectures for load and temperature forecasting under dataset size constraints and seasonality
2023/04/06
Papers
We visited the University of Tokyo and Tokyo city university and had a chance to look around some research facilities after that we talk with Professors and Doctors
Large facilities used for the wind tunnel experiments in the production technology lab of the University of Tokyo
The Professor Ryozo Ooka and Doctor 오원석
Especially, in Tokyo city university we met Masanori Shukuya who the best expert on exergy and thermodynamics in the world and we learn about the concept of exergy directly.
Professor Masanori Shukuya Teaching Exergy
What I learned the most in the class is the lecture attendees asked so many questions. They are very active about their curiosity and understanding and this attitude made the lecture bilateral. So we can expand our knowledge in many ways.
From the left to right Professor Wonjun Choi, Professor Emeritus Masanori Shukuya, Student Habin Jo
Through this experience, I thought the opportunity interact with researchers was expanded not only domestically.
Visiting University of Tokyo and Tokyo City University
2023/02/20 → 2023/02/24
Activity
We visited the Korea Institute of Energy Research (KIER). We can look around experiment equipments and also know about the Academic Co-op courses.
At the entrance of the KIER
We learned about the purpose of use and how to use the equipment of laboratory by listening to the lab’s Doctor.
Visiting of Korea Institute of Energy Research (KIER)
2023/02/08
Activity
2022
3

Participation in 2022 KIAEBS

Location: Yonsei University, Seoul
Euntak successfully made her first domestic conference presentation.
전역 민감도 분석 기반의 지중열 교환기 설계 길이의 불확실성 산정 presented by Euntak Shin
Yoonseong, Euntak, and Prof. Wonjun

Presented paper

by Wonjun Choi
by Euntak Shin
2022 KIAEBS Autumn conference
2022/11/25
Conferences

Participation in 2022 Autumn KSES

Location: Jeju Oriental Hotel, Jeju
Researchers at the University of Seoul and members of the betlab
We attended the Autumn Conference of Korea Solar Energy Society event on Jeju Island, which took place from October 19 to 21, 2022

Presented paper

by Wonjun Choi
2022 KSES Autumn conference
2022/10/19
Conferences

Participation in 2022 Summer SAREK

Location: Phoenix Park, Pyeongchang
Yoonseong, Euntak, Prof. Wonjun, Yunseon and Habin
From June 22nd to 24th 2022, we attended the Summer Conference of the Korean Society of HVAC (Heating, Ventilation and Air Conditioning) held at Phoenix Park in Pyeongchang, Gangwon Province."

Presented paper

by Wonjun Choi
2022 SAREK Summer conference
2022/06/22 → 2022/06/24
Conferences