Standards Development

Scope

This calculation module applies to instantaneous domestic hot water heat recovery using a counter-flow heat exchanger between the drain water and the incoming domestic cold water. This module calculates the recovered heat, to be taken into account in the overall calculation procedure of the energy performance of the building.

The scope of this document is to standardize the:

— required inputs;

— calculation methods;

— required outputs;

of the instantaneous heat recovery from domestic hot water drains.

This document provides a calculation method for one calculation interval.

This calculation is intended to be connected to the whole building calculation model and takes into account the external conditions and system controls that may influence the instantaneous heat recovery from domestic hot water drains.

This document does not apply to storage heat recovery or the use of drain water as a source for heat pumps.

This document does not apply to sizing or inspection of domestic hot water heat recovery devices.

Table 1 shows the relative position of this document within the set of EPB standards in the context of the modular structure as set out in EN ISO 52000‑1.

NOTE 1 The same Table is found in CEN ISO/TR 52000‑2, with, for each module, the numbers of the relevant EPB standards and accompanying technical reports that are published or in preparation.

NOTE 2 The modules represent EPB standards, although one EPB standard might cover more than one module and one module might be covered by more than one EPB standard, for instance a simplified and a detailed method respectively. See also Clause 2 and Table A.1 and Table B.1.