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 CO2 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 CO2 (CO2HP) that is used in a facility for disabled people. The following research was conducted. The operation of a hybrid system combining a PB and CO2HPs was investigated. While operating the system, four specific operations were developed as countermeasures to save on costs and reduce system troubles while reducing CO2 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.
Highlights
The building sector contributed over 35% of final energy use in the European Union (EU) in2016 [1]
Hot water supply is one of the leading consumers of energy in buildings in cold climate areas [2], and energy-saving for these systems has a great impact on reducing energy consumption and CO2 emissions in the building sector
The use of woody biomass is effective in reducing CO2 emissions in hot-water supply systems with wood pellet boilers (PBs)
Summary
The building sector contributed over 35% of final energy use in the European Union (EU) in. The use of woody biomass is effective in reducing CO2 emissions in hot-water supply systems with wood pellet boilers (PBs). In Japan, where fossil fuels are currently relied on to generate electricity, the electric system has a relatively high primary-energy conversion coefficient. The hybrid water heating system in this report combines CO2 HPs and a wood pellet boiler. Mori et al reported on the initial operation and found that the operation cost increased, the use of wood pellets during the daytime significantly reduce. The wood pellet boiler is a measure for reducing the primary energy consumption but can play an important role in a regional economy for sustainable development in countries that import energy resources such as Japan. Using regional economic input-output tables (I/O table), the influence of wood resources for wood pellets on regional economic ripple effects are introduced
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