An important theme for companies is the development of energy-saving products for global warming prevention and the reduction of carbon dioxide emissions. Kubota positions AHUs as “environmentally harmony products” and has developed and proposed energy-saving products in line with the needs in each era.
If we investigate the structure of the energy consumption in the office buildings where we work, we can see that a large proportion of the energy is used for heat source systems and other air conditioning equipment. (See figure below)
Around 12.0% of the energy is consumed for heat conveyance and it is said that 80% of that energy is consumed on parts such as the fans of AHU. Energy saving for those parts has a large effect.
The energy-saving performance of fans is affected by the performance as a single unit and also greatly affected by the selection, control type and drive type.
The selection of a highly efficient fan is very important for energy saving. It is possible to reduce the power by selecting high efficiency plug fans and airfoil fans. We select the optimal items from a large variety of fans.
The building load varies greatly depending on the weather on a particular day, the time and the season. The air volume is designed for the peak load, so reducing the air volume when the load is low can greatly reduce the conveyance energy. Rotation speed control using an inverter can lead to particularly large energy-saving.
There are two types of drive type, which are the belt drive type and the direct drive type. A direct drive type has no transmission loss due to belt slipping, so it has greater energy saving. In addition, the absence of a belt is a major advantage in terms of maintenance.
In conveyance energy, a large factor equivalent to the power for air conveyance is the power for water supply. One way to reduce this power consumption is to increase the temperature difference between the entering and leaving of the water and reduce the water flow rate. However, when this method is considered from the side of the AHU coil, there is the problem that the water velocity in the tube is reduced and so the heat transfer coefficient declines. Kubota handles this problem by using a wide range of “Small water flow/Large temperature difference coils” that can secure the appropriate water velocity inside the tube, even if the water flow is small.
Research has been performed for the effective use of high temperature waste heat such as the primary waste heat from cogeneration equipment and that heat is reused. However, the secondary waste heat after that reuse and the waste heat generated from items such as heat pump condensers has a low temperature and its reuse has been considered to be difficult. We have researched, developed and commercialized products that aim for energy saving through the effective use of this “low temperature waste heat.” We also have a proven record of reducing the cooling load by 50% by reusing the secondary waste heat of cogeneration and combining a low temperature regeneration desiccant rotor and a sensible heat exchanger.
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