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The UK test standard for Heat Interface Units, developed to assess UK heat network operating parameters, is regarded as an important step towards improving the overall performance of British district heating schemes.
The BESA test standard was explicitly developed in relation to one specific class of HIU which is the most common HIU type in the UK for use in typical new build developments and for typical operating conditions for radiator and under floor heating (UFH) systems.
• Heat and DHW loads based on new build developments, with apartments or small to mid-sized houses, with a maximum output <70kW (Heat and DHW).
• Indirect HIUs with hydraulic separation, with instantaneous DHW production and space heating provided via two separate plate heat exchangers.
• Network primary flow temperatures that are maintained during periods of low use via an HIU keep-warm function.
• High temperature regime: simulating typical operating temperatures for a system with radiators.
• Low temperature regime: simulating typical operating temperatures for a system with UFH.
The test regime and the basis of VWART calculation is most representative of HIU operation in new build flats. It should be noted, however, that the VWART calculation can be modified to better represent HIU performance in larger properties with bigger DHW demands and/or higher space heating loads.
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