37 Evaluation and Improvement Proposals for a Business Facility …
559
Fig. 37.2 System installation equipment (Horiike and Nagano 2015)
The system flow of the solar heat and ground heat hybrid system is shown in
Fig. 37.2. In the summer seasons, it operates as a hybrid heat source by operating the
adsorption type refrigerator that can operate at a low temperature using the acquired
solar heat and supply the output to the geothermal heat extraction flow. In addition, in the winter seasons, heat is transferred directly to the underground piping to
exchange heat from the sun, thereby warming the ground and using it as a hybrid heat
source. Antifreeze technology is used for underground piping, and air conditioning
is supplied to each of the stores using water-cooled heat pump. For hot water supply,
the water in the storage tank is preheated by heat exchange using the antifreeze
liquid warmed by a gas water heater powered with solar heat. A borehole type closed
loop system is adopted for underground heat collection piping, and a total of 12
heat collection pipes are used. In addition, 16 solar heat collectors are installed, and
the installation angle is 15°. Furthermore, the adsorption type refrigerator is conditioned to operate only in a time zone in which the pipe temperature of the solar heat
collector reach 55 °C or higher. The specifications of each equipment are shown in
the Table 37.1, Fig. 37.3.
559
Fig. 37.2 System installation equipment (Horiike and Nagano 2015)
The system flow of the solar heat and ground heat hybrid system is shown in
Fig. 37.2. In the summer seasons, it operates as a hybrid heat source by operating the
adsorption type refrigerator that can operate at a low temperature using the acquired
solar heat and supply the output to the geothermal heat extraction flow. In addition, in the winter seasons, heat is transferred directly to the underground piping to
exchange heat from the sun, thereby warming the ground and using it as a hybrid heat
source. Antifreeze technology is used for underground piping, and air conditioning
is supplied to each of the stores using water-cooled heat pump. For hot water supply,
the water in the storage tank is preheated by heat exchange using the antifreeze
liquid warmed by a gas water heater powered with solar heat. A borehole type closed
loop system is adopted for underground heat collection piping, and a total of 12
heat collection pipes are used. In addition, 16 solar heat collectors are installed, and
the installation angle is 15°. Furthermore, the adsorption type refrigerator is conditioned to operate only in a time zone in which the pipe temperature of the solar heat
collector reach 55 °C or higher. The specifications of each equipment are shown in
the Table 37.1, Fig. 37.3.