The scheme represents a typical system solution for residential buildings with multiple housing units distributed over several floors, where it is necessary to guarantee comfort, efficiency and safety in the distribution of domestic hot water (DHW).
DHW production and distribution
DHW production takes place in the thermal power plant through a sanitary kettle with adequate capacity for the entire needs of the building.
The DHW temperature regulation is entrusted to an electronic mixer (EMV) that allows an automated management of the delivery temperature and the programming of the thermal disinfection phases, with configurable schedules and temperatures for legionella prevention.
The sanitary water distribution network is structured on upright columns that carry DHW and AFS to the various floors and distribution manifolds with general interceptions, from which the branches for the terminals (bathrooms, kitchens, laundries) start.
This structure allows a capillary and orderly distribution, optimizing control and maintenance for each group of users.
In multi-storey buildings the distances between the kettle and points of use are high, so a recirculation circuit is necessary. In this diagram the recirculation is divided between the different upright columns and the returns flow towards the thermal power plant through balancing regulators.
The circuit can also be closed at the top of the column if the collectors are close to the main ridge
Hydraulic balancing
To keep the temperature uniform throughout the columns and ensure fast DHW delivery times, thermostatic balancing regulators are used. These devices:
● Ensure adequate recirculation flow rates for each upright
● Limit over- or under-feeding phenomena
● Contribute to the thermal stability of the system as a whole
Thermal disinfection
The electronic mixer allows the activation of automatic disinfection cycles, ensuring:
● Compliance with health requirements
● Elimination of potential microbiological contamination
Disinfection is carried out at high temperatures, scheduled at times of minimum use to avoid risks to users.
