The advanced inverter-driven Toshiba Daiseikai 8 heat pump is designed to deliver market-leading efficiency and comfort for building occupants, and boasts one of the lowest noise levels for a commercial air conditioning indoor unit in its class.
In addition to a triple A+ energy rating (AAA+) for both cooling and heating, the new high-wall Daiseikai units have a special quiet mode that enables them to operate down to 20dB(A) - equivalent to the ticking of a wrist watch in an otherwise silent room.
The performance improvements have been made possible by the introduction of several new technologies working in combination. A type of vector-controlled power inverter converts electrical current into a smooth sine-curve, enabling more efficient operation of the DC motor driving the air conditioning compressor.
The twin-rotary compressor works in conjunction with a new design of four-way valve, while a redesigned heat exchanger optimises thermodynamic efficiency in both cooling and heating modes. The arc-shaped heat exchanger is twinned with a large helical-shaped fan to improve air circulation and reduce noise.
Toshiba Daiseikai’s ability to match both cooling and heating output to very low levels of load also helps boost energy performance. This means output can be precisely controlled to provide only as much cooling and heating as required, significantly reducing energy use at part- and low-load conditions.
A sophisticated remote control system gives end users unprecedented control of comfort. Air flows can be controlled in three dimensional space with six pre-set patterns, giving varying horizontal and vertical flows. These include wide sweeps for overall cooling or heating and focused options for targeting hot or cool spots in a room.
Advanced disinfection of air passing through the unit is achieved with the use of a high-energy plasma generation system. Fine particulate filters are used as a second barrier to prevent the spread of airborne contaminates.
As a further hygiene measure, Daiseikai units are equipped with a self-cleaning function that removes moisture condensed on the evaporator coil after the unit has been switched off. In conventional systems, moisture is retained inside an air conditioning unit when it is powered off, encouraging the growth of bacteria and mould. The Daiseikai system automatically removes any moisture, leaving the unit completely dry.
For installers, mains power input levels can be customised on both indoor and outdoor Daiseikai units, giving great flexibility. Maximum pipe length at 25m for the SDSK8 unit, and maximum height difference for the same model, is significantly higher than for the equivalent model of notable competitors and enables use in a wider range of applications.
David Dunn, general manager of Toshiba Air Conditioning, says: “There is a big market in the UK for stylish, high-performance high-wall-mounted air conditioning that delivers unobtrusive comfort for people at work and at home. People want to be comfortable and productive without it costing the earth, and without being disturbed by irritating noise and vibration or poorly controlled air flows.
“Toshiba’s new Daiseikai 8 delivers on all these fronts. With its outstanding design, excellent efficiency and near-silent operation, we believe it sets a new standard for premium air conditioning.”