Abstract
This article surveys a so far little known approach to two simultaneously requested but mutually opposed requirements on internal conditions in buildings. It is the growing demand of better internal comfort while the other is decrease of costs and energy consumption. The internal conditions is ensured by terminal units located and adjusted at the points of conditioned air delivery into rooms. Author’s terminal units achieve the goal by having no moving parts. Advantages are low cost, robustness and long operating life without maintenance. Capability to switch the air flows at a high frequency without wear opens new ways to control, such as the flow pulse width modulation. The fast switching also makes possible small regenerative heat exchangers, keeping inside the building the heat extracted from the removed contaminated air.
Highlights
Buildings may seem to be not important consumers of energy
Complications came with buildings containing several rooms - as it was quite early established that it is better to generate the heat in a central plant
Paper discusses the solutions offered by terminal units operating without any mechanical moving components — using the fluid flow control ideas introduced recently by pure fluidics
Summary
Buildings may seem to be not important consumers of energy. maintaining the living conditions consumes as much as ~ 40% of total worldwide energy production - and this proportion rapidly grows. Rooms nominally identical have different demands due to variables like positions of partitions, cubicles, cabinets, furniture, and the incident solar radiation of widows and walls and its variation during the day This all calls for thermal control applied in the terminal units which deliver to the occupants the warm or cold air — which is, in addition, processed by filtering, humidity removal (or humidity addition, e.g. in frosty winters). Meeting the mutually opposing requests of comfort and yet low cost and low energy demand are the currently developed new fluidic terminal units. They have no mechanical movable parts, using the principles of pure fluidics. The idea of fluidics brings other secondary advantages, such as the reduced number of electric conductors decreasing the danger of fires, etc
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