IEA HPP Annex 40 Bundesamt für Energie BFE IEA Heat Pump Centre iea International Energy Agency‌


The Japanese team is represented by the Nagoya University and the Nagoya City university as well as several Japanese manufacturers. The national project is coordinated by the Heat pump and thermal storage centre of Japan and supported by NEDO.



National team leader

Prof. Dr. Eng. Masaya Okumiya
Nagoya University
1 Furo-cho Chikusa-ku
Nagoya 464-8603, JAPAN
Tel: +81-52-789-4653
Fax : +81-52-789-3773
E-mail : okumiya(at)davinci.nuac.nagoya-u.ac.jp
Internet: http://www.nagoya-u.ac.jp

National team

Prof. Dr. Eng. Yoon Gyuyoung
Associate Professor
Nagoya City University
Graduate School of design and architecture
2-1-10, Kitachikuta, Chikusa
Nagoya 464-0083, JAPAN
Tel: +81-52-721-3175
Fax : +81-52-789-3773
E-mail : yoon(at)sda.nagoya-cu.ac.jp

National project

In Japan, Net Zero Energy Buildings are in the market introduction phase. Up to now, only some pilot and demonstrations project are currently in the building process and will be monitored to gather experience with technologies. The Japanese government has set up a schedule for the introduction of NZEB as future building standard.

The NZEB standard shall be develop stepwise. Until 2020 all new public buildings shall fulfil a Net Zero Energy Balance, and by 2030, NZEB shall be realised on average for all new buildings.
Japan has set-up design targets for adapted heat pumps for the use with renewable energy systems concerning criteria like capacity range, capacity control and temperature lift. Moreover, a separation of sensible and latent heat load for air-conditioning can have efficiency potentials. An analysis and optimization of system configurations by calculation/simulation will be performed in Task 2 comprising the following steps:

  • Study about building envelopes, technologies integrated with building equipment such as air-conditioners, lightings etc.
  • Technologies and concepts should be focused on results from Task 1 of currently available technologies, foreseeable technologies which have been developed or are presently under developing by manufactures
  • Evaluation criteria shall be energy efficiency and cost performance.
  • Evaluation will be done on a simulation basis.
  • For retrofits, many many challenges have to be confronted from the technological or financial point of view.

Japan will simulate different NZEB buildings under Japanese and European load conditions in order to derive design recommendations and get information on the system behaviour in NZEB conditions. The Japanese Team consists of different Japanese utilities and heat pump manufacturers.

Japanese links

Heat Pump and Thermal Storage Centre of
Japan (HPTCJ)

HPTCJ hosts the Japanese National Team, which
cooperates on an international level with the IEA
Heat Pump Programme and the IEA Energy
Conservation through Energy Storage Programme.
The website includes news, publications, etc. in
Japanese and parts in English at

NEDO is Japan's largest public R&D
management organisation for promoting the
development of advanced industrial,
environmental, new energy and energy
conservation technologies.
The website is in Japanese and parts of the
information are in English at