SORKE s.r.o. Pardubice specialises in the air-conditioning branch, for the improvement of the interior environment in buildings and technologies. We provide technical proposals and deliveries for ventilation, energy recovery, warm-air heating, air-conditioning and cooling. 
Recuperation
If heat recovery is used in the ventilation technology, the heat is transferred from exhausted stale air to supplied air through a fixed wall. If this principle is used, no contact occurs between waste and supplied air and therefore this is also generally suitable for contaminated waste air. Recovery units are a basis of the design. Better efficiency is usually achieved if plate cross recovery units with a compact and relatively simple design are used. Various materials – steel, aluminium, plastic – may be used for plates in heat exchangers.
Even higher efficiencies varying approximately between 60 and 90% may be achieved through a counter-flow design and a channel section of flow routes in the heat exchanger. Each solution should therefore aim at designing an optimum system for the conditions and use in question.
>> Recuperation ... more information (Czech only)
Fresh air with possible use of recovered energy
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At present this modern method using heat recovery is also applied to residential building are ventilation – both in single-family houses and in residential blocks of flats. This is one of the methods of reducing energy consumption requirements of buildings. The heat recovery (recuperation) is a part of the system ensuring ventilation through air exhaust and supply. These systems of forced ventilation with heat recovery use residual heat from stale air, which heats fresh air flowing to the premises from the outer environment.
Before fresh air enters the room, it is preheated without getting into contact with stale air. This economical ventilation has certain advantages, e.g. economical heating, controllable ventilation intensity, air filtration with dust and pollen filters, minimisation of temperature differences and suppression of uncontrolled draughts .
Ventilation of offices
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The central heat recovery unit installed in the technical room on the first floor serves to provide ventilation in the operational part of the office block. The unit ensures supply and exhaust of filtered air with heat recovery (use of waste heat). Stale air is exhausted to the outer environment through a roof unit. Air is supplied from the outer environment through the weather louvre installed in the outer wall of the building. The unit is controlled through a multi-speed switch with a weekly timer.
The ventilation system includes regulating dampers to control the required amounts of air in individual ventilation duct branches. Air supply and exhaust in individual rooms is designed using valves installed in ceiling of individual rooms.
