Tsupply vs Troom

The one that we at Damvent prefer and the one that we always recommend is the Supply temperature control. To achieve this type of control, it is obvious that our solution will take care only for the fresh air. For instance, a classic HVAC system or DH/VRF system will need to take care of the cooling loads and heating losses separately. In this case, the classic system controls the room temperature and our solution for fresh air (the hybrid one) controls the Supply temperature. An important thing to notice here is that the Supply temperature is always linked to the Room temperature with a difference of +/- 1 to 4oC depending on the mode (cooling or heating).
To achieve Supply temperature control, the hybrid unit must be equipped with a capacity-controlled compressor, electronic expansion valve (EEV), and it is good to have a frequency inverter on the wheel. As a result, superior control is achieved, and we can have a straight line of the supply temperature. As a final result, ultimate energy savings are obtained. An important notice: the classic HVAC system must always be switched on prior to the Fresh Air system, and once a certain Troom is reached, then the Ventilation system with Tsupply control will be switched on!!!

Control of the room temperature is also possible, but certain conditions must be fulfilled. To work by Room temperature control means that our hybrid solution must take care not only for the fresh air but also for the cooling loads and heating losses.

Some important notes:
- Very good cooperation between the consultant and us is needed to obtain the necessary air changes ratio.
- Adequate calculations on the heating losses and cooling loads
- Properly sized supply and extract grills and correct scheme of the air distribution
- Proper air change ratio/hour
- Backup heating for starting mode when the temperature of the room air is low is a must.

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