design method

In recent years, the adoption of water-based radiant ceiling cooling systems has been increasing in Japan with the aim of realizing comfort and energy savings. Conventionally, when designing radiant cooling systems, the target operative temperature for the indoor thermal environment is set, but these are usually combined with convection air conditioning system, which do not always achieve the target value during summer cooling.

Since no literature on design calculations for natural ventilation could be found, the author developed an original design method in the early nineties. He is still using the method to design areas that have to be ventilated naturally. An example of a very common application, is designing the ventilation of a transformer room and the outside air grid area necessary. A surprising result of the design of a practical situation is that it can be demonstrated on the basis of the calculations that wind speed has relatively little effect on the natural ventilation.