562
D. Yoshidome et al.
refrigerator is dependent on the outside air temperature, as it is the highest in July
when the average outside air temperature is high. This was not the case in May where
the heat collection is the highest. In addition, COP tends to decrease in months when
output is small, and there is no month that satisfies rated COP = 0.6. It has been
found that the COP of the adsorption refrigerator increases as the temperature of the
low-temperature heat source increases. It is thought that the reason why the COP is
lower as the outside air temperature is lower is because the antifreeze temperature
after solar heat collection is lower.
37.3.3 Performance Evaluation of Adsorption Type
Refrigerator
The geothermal heat pump is installed in a section close to each store, and the ground
heat collecting pipe to the heat pump are connected by underground piping. The chart
below shows the air conditioning load, power consumption, and COP is shown by
month. Compared to COPs in the middle and winter seasons, both stores have less
than half the COP in summer, indicating that they have not reached the rated COP. In
addition, in the store B, the COP from October to December was less than a half of
the store C. This might indicate that the power consumption had been increased for
some reason (Fig. 37.6). One possibility is that the store’s air conditioning setting is
affecting this factor. We plan for an interview survey to confirm about this.
Fig. 37.6 Air conditioning load, power consumption of geothemal heat pump and COP
D. Yoshidome et al.
refrigerator is dependent on the outside air temperature, as it is the highest in July
when the average outside air temperature is high. This was not the case in May where
the heat collection is the highest. In addition, COP tends to decrease in months when
output is small, and there is no month that satisfies rated COP = 0.6. It has been
found that the COP of the adsorption refrigerator increases as the temperature of the
low-temperature heat source increases. It is thought that the reason why the COP is
lower as the outside air temperature is lower is because the antifreeze temperature
after solar heat collection is lower.
37.3.3 Performance Evaluation of Adsorption Type
Refrigerator
The geothermal heat pump is installed in a section close to each store, and the ground
heat collecting pipe to the heat pump are connected by underground piping. The chart
below shows the air conditioning load, power consumption, and COP is shown by
month. Compared to COPs in the middle and winter seasons, both stores have less
than half the COP in summer, indicating that they have not reached the rated COP. In
addition, in the store B, the COP from October to December was less than a half of
the store C. This might indicate that the power consumption had been increased for
some reason (Fig. 37.6). One possibility is that the store’s air conditioning setting is
affecting this factor. We plan for an interview survey to confirm about this.
Fig. 37.6 Air conditioning load, power consumption of geothemal heat pump and COP