Heating and cooling water in HVAC systems of non-domestic buildings can circulate for extensive periods and be responsible for considerable energy use.
13.2 Scope of guidance
This section provides guidance on specifying:
• heating system glandless circulators, both standalone and integrated in products
• heating and cooling system water pumps
to limit their energy consumption and meet relevant energy efficiency requirements in the Building Regulations. The guidance covers circulators and water pumps when used in closed systems.
13.3 Key terms
Heating system glandless circulator means a pump used to circulate hot water in closed circuit heating systems. The glandless (or wet rotor) circulator is a centrifugal pump with an integral motor and no mechanical seal. It can have an integrated motor drive unit for variable speed operation.
Water pump (also known as ‘dry rotor’ or ‘direct coupled’ pump) means a centrifugal pump driven by an electric motor and generally having mechanical seals. Common pump types include in-line, end suction and vertical multi-stage. The first two are usually single-stage pumps having single-entry volute. By design they can all be used as circulators for all HVAC applications depending on configuration and duty.
13.4 Glandless circulators and water pumps in new and existing buildings
Heating system glandless circulators and heating and cooling system water pumps in new and existing buildings should meet the recommended minimum standards in Table 45.
****Table 45 Recommended minimum standards for heating system glandless circulators and heating and cooling system water pumps in new and existing buildings****
13.5 Supplementary information