Mitsubishi's Air Conditioner Saves Energy in Absence of Person

Aug 23, 2012
Shinya Saeki, Nikkei Electronics
Mitsubishi Electric's new household air conditioner in normal operation
Mitsubishi Electric's new household air conditioner in normal operation
[ If it clicks, the expanded picture will open ]
It automatically switches to low-power consumption mode when there is no person in the room.
It automatically switches to low-power consumption mode when there is no person in the room.
[ If it clicks, the expanded picture will open ]

Mitsubishi Electric Corp announced the "ZW series" of household air conditioners, which automatically switch to low-power consumption mode when there is no person in the room, Aug 21, 2012.

The ZW series will be released as new products of the company's "Hybrid Kirigamine" air conditioners. And the new power saving function is called "Smart Stop System."

The ZW series will come in 11 models whose rated cooling powers range from 2.2kW to 8.0kW. Mitsubishi Electric will start to release them in early November 2012. Though there is no manufacturer's suggested retail price, the expected prices of the air conditioners are from ¥208,000 (approx US$2,651) to 358,000.

The Smart Stop System determines if there is a person in the room by using infrared sensors. The ZW series is equipped with two infrared sensors called "Smart Eye" in addition to the "Eco Move Eye," which is also mounted in Mitsubishi Electric's existing air conditioners. The Eco Move Eye, which is movable, is used to check the states of the entire room and people while the Smart Eye detects movements of a person in front of the air conditioner in 0.3 seconds.

By combining them, it becomes possible to switch to the low-power consumption mode in three minutes, Mitsubishi Electric said. Also, the ZW series has a function to turn itself off if there has been nobody in the room for 30 minutes or longer as well as a function to automatically turn itself on when it detects a person.

Furthermore, the ZW series has the "Smart Hybrid System," which saves energy by measuring a sensible temperature with infrared sensors and automatically switching among three modes ("cooling," "cold air" and "wind"). For example, with a preset temperature of 26°C, the air conditioner operates in the cooling mode at a sensible temperature of 29.5°C or higher, in the cold air mode at a sensible temperature of 28-29.5°C and in the wind mode at a sensible temperature of 28°C or lower.