Important Dates

  • November 30 2020

    Full Paper Submission Due

  • December 20 2020

    Full Paper Review
    (For the new submitted papers)

  • January 15 2021

    Final Full Paper Submission Due
    (For the new submitted papers)

  • January 31 2021

    Early Bird Registration Due

  • March 15 2021

    Extended pre-recorded presentation submission due

TODAY 2021. 04. 11




Workshop(Online Only) / Monday, April 26, 2021

1. Workshop A1 (20:00~22:00 KST, 13:00~15:00 CEST, 07:00~09:00 EDT)

Title: Annex 42/45 on HPs and Smart Grids, and Hybrid
Organizer: Paul Friedel
French Environment and Energy Management Agency, France
Theme: In the Netherlands, there is a lot of experience with hybrid HPs, giving very promising possibilities to accelerate the energy transition without immediately needing to renovate each building. Also, hybrids are exquisitely suitable to provide flexibility to the electricity grid.
Program: We will organize two short presentations on the 'NL hybrid success story', and the 'Flexibility from hybrid HPs', followed by a discussion between the attendants on their local opportunities.

2. Workshop A2 (22:00~24:00 KST, 15:00~17:00 CEST, 09:00~11:00 EDT)

Title: Heat Pumps for Low GWP Refrigerants (Annex 54)

Prof. Yunho Hwang
University of Maryland, United States
Theme: Annex 54 aims at promoting the low GWP refrigerant application to accelerate phase down of high GWP HFCs via 1) a comprehensive review of recent R&D progress on component optimization using low-GWP refrigerants, 2) in-depth case studies of component optimization, which can provide design guidelines and real-world experiences.
  • “Introduction of IEA HPT's Annex 54 for Heat Pumps for Low-GWP refrigerants” by Yunho Hwang (University of Maryland, USA)
  • “Experimental evaluation of R410A, R407C and R134a alternative refrigerants in residential heat pumps"” by Pierre Pardo (CETIAT, France)
  • “Modular and scalable heat pump models for the design process of heat pump systems” by Christian Vering (RWTH Aachen University, Germany)
  • “Commercialization of R32 in a Window Type Air Conditioner for US Market and Split Air Conditioners for European Market” by Younghwan Ko (LGE Korea)
  • “Comparitive analysis of propane heat pumps - a try to harmonize technical boundary conditions in world-wide projects” by Thore Oltersdorf, Peter Schossig, Lena Schnabel (ISE Fraunhofer, Germany)

3. Workshop B1 (20:00~22:00 KST, 13:00~15:00 CEST, 07:00~09:00 EDT)

Title: Heat Pump Water Heaters, a Challenging Future (Annex 46)
Organizer: Onno Kleefken
Phetradico, Netherlands
Theme: TBA
  • Neil Hewitt “overview of alternative refrigerants and future opportunities”
  • Kashif Nawaz “speed controlled compressor”
  • Jon Heller “central HPWH systems for multifamily (new or retrofit) buildings”
  • (TBA)

4. Workshop B2 (22:00~24:00 KST, 15:00~17:00 CEST, 09:00~11:00 EDT)

Title: Annex 55 on HPs and Energy Storage
Organizer: Paul Fridel
French Environment and Energy Management Agency, France

This annex is in the process of being finalized. We will present various results from the Annex, supported by participating experts:

  • Which specific advantages can be achieved by a better integration of HP and storage components?
  • Which different types of integrated systems (i.e. CCB, comfort and climate box) exist?
  • Recommendations for stakeholders: how to support the market for CCBs in an optimal way?
  • Case studies: brand new research results and practical applications of integrated HP/storage systems.
Program: TBA

5. Workshop C1 (20:00~22:00 KST, 13:00~15:00 CEST, 07:00~09:00 EDT)

Title: Heat Pumps in Multi-Family Buildings for Space Heating and DHW (Annex 50)
Organizer: Marek Miara
Fraunhofer ISE, Germany
Theme: TBA
Time CEST Speaker Topic
13:00-13:20 Odile Cauret
EDF – Research & Development
Presentation of the Multi-Family Buildings status in participating countries (results from the Task 1)
13:20-13:40 Marek Miara
Fraunhofer ISE
Presentation of the “solution matrix” as the main outcome of the Annex 50. From general categorization of solutions to the case studies.
13:40-14:10 Charles Geelen
Infinitus Energy Solutions Group,
Andreas Zottl
AIT Austrian Institute of Technology GmbH
Presenting general solutions descriptions. (Active participation of participants desired).
14:10-14:30 Nicole Calame
Presentation of the case studies, different types of building and dedicated solutions
14:30-14:50 Marco Simonetti
Politecnico di Torino
New simulation approach – as simple as possible, as precise as required

6. Workshop C2 (22:00~24:00 KST, 15:00~17:00 CEST, 09:00~11:00 EDT)

Title: Design and Integration of Heat Pumps for nZEB (Annex 49)

Prof. Carsten Wemhöner
Professor for Building system technologies
Institute partner IET –Institute of Energy Technology, OST – Eastern Switzerland Univ. of Appl. Sciences
Theme: The workshop presents result of IEA HPT Annex 49 on heat pump application in nearly Zero energy buildings nZEB. Starting from the state of the art of nZEB results of heat pump monitoring in nZEB and simulation-based studies on design and control of heat pumps are presented. The workshop is concluded with developed multifunctional HP prototypes and lessons learned.

nZEB definition and ambition level

(Time CEST)

  • 15.00 – 15.10: Introduction and overview of IEA HPT Annex 49 (C. Wemhoener)
  • 15.10 – 15.20: Swedish nZEB implementation and comparison of heating systems (O. Gustafsson)
  • 15.20 – 15.35: Methodology to compare nZEB ambition level in different countries (F. Ochs)

Case studies and optimisation of heat pumps in nZEB by monitoring/simulation

  • 15.35 – 15:50: Group of eight buildings with low temperature heating grid (C. Betzold)
  • 15.50 – 16.05: Vögelebichl Innsbruck – Monitoring and simulation of two multi-family houses with heat pump, PV andcollectors (F. Ochs)
  • 16.05 – 16.20: Monitoring of Energy plus buildings with different use (F. Bockelmann)

Prototype technologies and heat pump integration options

  • 16.20 – 16.35: Façade integrated PV-coupled heat pump system for space cooling (A. Heinz)
  • 16.35 – 16.50: Integrated heat pump (IHP) prototypes for NZEB (V. Baxter)


  • 16.50 – 17.00: Lessons learned (C. Wemhoener)

7. Workshop D1 (20:00~22:00 KST, 13:00~15:00 CEST, 07:00~09:00 EDT)

Title: Comfort and Climate Box Solutions for Warm and Humid Climates
Organizer: Heat Pump Centre, Oakridge National Laboratory (ORNL) and BDH (in the Netherlands)
Theme: The demand for comfort cooling is growing rapidly in many parts of the world, especially in emerging countries, and stated policies will not be able to curb electricity use for cooling, which is set to grow threefold by 2070 relative to 2019, according to IEA. There are great possibilities to increase the energy efficiency and the share of renewable electricity used for comfort cooling, by combining heat pumping technologies with energy storages and integrated control. The purpose of the workshop is to develop a proposal for a new international collaboration project (i.e. Annex) aiming at speed up deployment of such solutions, so called “Comfort and Climate Boxes” for warm and humid climates – solutions that are efficient, affordable, applicable and scalable.

(Time CEST)

  • 13.00 – Introduction
  • 14.00 – Group Discussions
  • 14:45 – 14:55 - Summary and next steps

8. Workshop D2 (22:00~24:00 KST, 15:00~17:00 CEST, 09:00~11:00 EDT)

Title: Large demonstration project for flexibility by heat pumps (Annex 57)

Senior Consultant Svend Pedersen
Danish Technological Institute
Theme: Annex 57 aim is to focus on the implementation of heat pumps in district heating and cooling systems. The main focus areas are 1) the creation of possible flexibility in the thermal network and electrical grids. 2) the possibilities of increasing larger share of renewable energy and excess heat as well as to reduce the CO2 emissions in the heating systems by using heat pumps.
  • “Introduction of IEA HPT's Annex 57 “Flexibility by implementation of heat pump in multi-vector energy systems and thermal networks” by Svend Pedersen Danish Technological Institute
  • “Hybrid Energy Networks in a international and national perspective” by Peter Sorknäs Aalborg University
  • “Experiences from creation of flexibility with heat pumps in district heating grids” by Wibke Messenburg Danish technical University
  • “Potentials of flexible heat pump operation on a district scale” by Dr.-Ing. Young Jae Yu
  • Discussion