DC Inverter
Reluctance DC Inverter Power Control Achieves High COPs
The DC Inverter series features the Reluctance DC motor for compressor and DC motor for fan. This hi-tech energy-saving package is completed by Daikin"s advanced swing compressor and PAM control. FTXS25E achieves a COP of 4.17 , 48% higher than conventional model. This is the result of upgrading from conventional AC inverter to advanced DC Inverter technology.
Inverter Advantages Compared to Non-Inverter
After the indoor temperature approaches the set temperature, Inverter Control adjusts to low capacity operation to maintain this temperature. This makes inverter models more energy-saving than non-inverter models, which must repeatedly start or stop their compressors to maintain the room temperature.
Inverter air conditioners operate at maximum capacity as soon as they start up. As a result, the set temperature can be reached more quickly.
Inverter air conditioners finely adjust capacity according to changes in the air-conditioning load and the difference between the indoor temperature and set temperature is small. These give higher comfort levels than with non-inverter air conditioners.
Variable Capacity Operation
Inverter air conditioners are able to vary their operating capacity. Non-inverter air conditioners can only operate at a fixed capacity.
Energy-Saving Technological Features
Swing Compressor
Thanks to its smooth rotation, the swing compressor decreases friction and vibration. It also prevents the leakage of refrigerant gas during compression. These advantages provide quiet and efficient operation.
The swing compressor can reduce operational vibration and sound because its piston moves smoothly inside the compressor.
This marked the development of a high-performance swing compressor that was compatible with alternative fluorocarbons. The prize was presented in 1997.
Reluctance DC Motor for Compressor
Daikin DC Inverter models are equipped with the Reluctance DC motor for compressor. The Reluctance DC motor uses 2 different types of torque, neodymium magnet*1 and reluctance torque*2. This motor can save energy because it generates more power with a smaller electric power than an AC or conventional DC motor. It is more efficient at the low frequencies most commonly used by air conditioners,*3 improving efficiency by approximately 20%.
This was the first scroll compressor to be equipped with the Reluctance DC motor in commercial-use air conditioners. The Institute of Electrical Engineers of Japan presented the award in 1998.
*1. A neodymium magnet is approximately 10 times stronger than a standard ferrite magnet.
*2. The torque created by the change in power between the iron and magnet parts.
*3. The frequency range used by air conditioners during periods of stable operation. This is the range in which air conditioners operate for the longest periods.
*4. Data are based on studies conducted under controlled conditions at a Daikin laboratory.
PAM control
Pulse Amplitude Modulation (PAM) control reduces energy loss by controlling how often the converter switches on and off.
