Room Air Conditioner

Air conditioning accounts for around one quarter of power consumption in the home. Because air conditioning is something you use every day, we see it as the appliance which most needs higher energy-saving performance. RAS-S40Z2 Room　Air Conditioner uses the most advanced technology to achieve energy saving and size reduction at the top class in the industry* in Japan. Reducing power consumption helps to reduce CO2 emissions.

• * Among room air conditioners for home use in the 4.0kW class in Japan. As of December 2009. Seasonal power consumption was 1,272kWh.

(Updated in March 2010)

What air conditioners must achieve is energy-saving performance

Room air conditions work at full power to make your room comfortable. Recently, a growing number of households has begun to use air conditioner all year round, regardless of the season, for heating in winter as well as for cooling from rainy season through summer.
As this graph illustrates, the share of household power consumption taken by air conditioners has surpassed 25%. Consumers were dissatisfied with the burden of their electricity bills.
Any saving in the electricity bill is also linked to reduced CO2 emissions. Hitachi knows that enhancing the energy-saving performance of air conditioners that work every day will make our customers happy, and will also help the global environment. For that reason, we strive to build air conditioners that run on as little electricity as possible.

• * Source: 2004 Summary of Power Supply and Demand, by the Resources and Energy Agency

What should we do to save energy?

Improving compressor efficiency is very important for saving energy in air conditioners. We decided to use motors, which will operate with less power consumption, to improve compressors' energy-saving performance. CV-PAM control(*1) is also valuable when the motor runs at high speed, such as when the air conditioner starts up. In addition to conventional current control, the speed of the motor is also controlled, so that it runs at stable revs even at high speed, delivering high power smoothly. This system saves energy while providing high power.
We also use interior heat exchangers with a new structure, waveform silver ion fans and other advanced and innovative Hitachi technologies, to create powerful air conditioners that still save energy.
As a result, the product achieves heating approximately 1.7 times faster than a conventional inverter air conditioner (*2).

*1

This is PAM with Cascade Vector Control. PAM is an abbreviation for Pulse Amplitude Modulation.

*2

Compared to Hitachi's previous RAS-E40Y2 inverter air conditioner.

Enhanced energy-saving performance in a compact body!

Hitachi's RAS-S40Z2 Room Air Conditioner uses advanced technologies such as energy efficient scroll compressor and CV-PAM engine to cut seasonal power consumption to 1,272kWh* while keeping interior unit body width to a compact 798mm. This air conditioner keeps installation simple at the replacement stage, and helps the household budget afterwards. (Seasonal power consumption of the RAS-E40Y2:1,636kWh).

• *:Seasonal power consumption according to the conditions set by the Japan Refrigeration and Air Conditioning Industry Association (JRA4046). The calculation criteria are modeled on Tokyo air temperature conditions.

The Lithium and solar remote control matches energy-saving operation to occupant movements

One can choose either “eco operation” mode or “area eco” mode through remote controller.

When “eco operation” mode is set, a sensor on the interior unit checks where the occupants are, how active they are, and the humidity, and automatically regulates the set temperature. The eco operation mode for heating avoids overheating the room as a whole. The eco operation mode for cooling adapts to the level of occupant activity to avoid excessive cooling. If the remote control is next to the user and area eco mode is selected, the temperature is controlled for comfort in the area around the person. Focusing air conditioning narrowly on the target area improves energy-saving performance.

*3

Area eco mode will save energy as much as 14% while heating, compared to operation when it is not set. This energy-saving effect was measured with the RAS-S40Z2 at Hitachi Environmental Testing Laboratory.*These figures are based on conditions set independently by Hitachi. They differ from seasonal power consumption calculated on the JIS standard.

All of the technology for the Earth

In taking this view, the Hitachi Group views the room air conditioner as one of the ways we can achieve our Environmental Vision 2025, with a goal of helping to reduce annual CO2 emissions by 100 million tons by 2025 through our products and services.

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