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Pannelli solari termici a circolazione forzata

Schema impianto a circolazione forzata

I sistemi termici forzati sono la soluzione ideale quando si vuole produrre acqua calda in quantità anche elevate: palazzine con più appartamenti, case di riposo (caratterizzate da consumi di acqua molto elevati, alberghi, ristoranti, centri sportivi o palestre con docce…

Come funzionano?

Scopriamo il funzionamento di questi sistemi seguendo lo schema riportato a destra.

I collettori termici (A) hanno al loro interno dei tubi dentro ai quali scorre un liquido (acqua + antigelo) che quando è esposto al sole si scalda. Una centralina (B) misura la temperatura raggiunta dal liquido nel pannello e quella dell’acqua contenuta all’interno del serbatoio. Se il liquido nei pannelli è più caldo dell’acqua del serbatoio, la centralina fa partire una pompa (C) che spinge il liquido all’interno del circuito in modo da farlo passare attraverso una serpentina interna al serbatoio. Attraverso tale serpentina (D) avviene il passaggio del calore dal liquido all’acqua del serbatoio, che entra quindi nel circuito dell’acqua sanitaria della casa (E).

D’inverno o in periodi di prolungato brutto tempo, si richiede più acqua di quella che il sistema può fornire. In questi casi interviene la caldaia (F) che, scaldando dell’acqua che passa in una seconda serpentina posizionata nella parte alta del serbatoio, fornisce il calore utile a raggiungere la temperatura desiderata. In ogni caso la caldaia interverrà meno e consumerà quindi meno gas o gasolio.

In estate l’impianto solare è sufficiente a garantire l’acqua sufficientemente calda per bagni, cucina e lavanderia.

Per capire qual è il sistema termico più adatto alle proprie necessità bisogna sempre partire dai consumi termici e dalla superficie disponibile per il posizionamento dei pannelli solari termici (tetto o terreno).

I principali vantaggi di questi impianti sono i seguenti:

1. Alta efficienza grazie al serbatoio verticale (si evitano miscelazioni di acqua fredda e calda)
2. Posizionamento del serbatoio all’interno dell’abitazione (minimizzazione dell’impatto visivo del sistema)

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