Optimization of a Wood Pellet Boiler System Combined with CO 2 HPs in a Cold Climate Area in Japan

Taro Mori, Yusuke Iwama, Hirofumi Hayama and Emad Mushtaha
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Taro Mori: Graduate School of England, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
Yusuke Iwama: Graduate School of England, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
Hirofumi Hayama: Graduate School of England, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo 060-8628, Japan
Emad Mushtaha: Department of Architectural Engineering, Sustainable Engineering Asset Management (SEAM) Research Group, College of Engineering, University of Sharjah, Sharjah, UAE

Energies, 2020, vol. 13, issue 21, 1-17

Abstract: Hot water supply is one of the leading consumers of energy in the building sector in cold climate areas. The use of woody biomass is effective in reducing CO 2 emissions in hot-water supply systems. This report deals with a system that combines a wood pellet boiler (PB) and a heat pump system with CO 2 (CO 2 HP) that is used in a facility for disabled people. The following research was conducted. The operation of a hybrid system combining a PB and CO 2 HPs was investigated. While operating the system, four specific operations were developed as countermeasures to save on costs and reduce system troubles while reducing CO 2 emissions. The processes and results are introduced. Numerical simulations were carried out to optimize the operation. The hot water temperature, water volume, and hot water loads were simulated. The influence of the water volume ratio on the cost and primary energy consumption under the requirements for safe system operation was studied. The regional economic ripple effects (REREs) of this system were studied. The wood pellet boiler is not only a measure for reducing primary energy consumption but can also play an important role in a regional economy for sustainable development in countries that import energy resources such as Japan.

Keywords: woody biomass; wood pellet boiler; heat pump; combined system; hot water supply; regional economic ripple effect (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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