BS ISO 52031:2020 Energy performance of buildings — Method for calculation of system energy requirements and system efficiencies — Space emission systems (heating and cooling).
This document establishes the required inputs, outputs and links (structure) of the calculation method for heating and cooling space emission systems.
This document is applicable to the energy performance calculation of heating systems and water-based cooling space emission sub-systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 7345, Thermal performance of buildings and building components — Physical quantities and definitions ISO 52000-1. Energy performance of buildings — Overarching EPB assessment — Part 1: General framework and procedures
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7345 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso,org/obp
— IEC Electropedia: available at http://www.electropcdia.org/
emissions within the heating system as losses through the building envelope due to non-uniform temperature distribution, control (13) inefficiencies and losses of emitters embedded in the building structure
emissions within the cooling system as losses through the building envelope due to non-uniform temperature distribution, control inefficiencies and losses of emitters embedded in the building structure
self-acting devices with and without auxiliary energy to keep a physical condition such as temperature, humidity, etc. close to set-point
5 Description of the method
5.1 Output of the method
The method described in this document calculates:
— energy losses (heating and cooling) Q em,ls in kWh;
— auxiliary energy: heat/cooling emission W em in kWh;
— room temperature θ int,inc in °C.
The time step of the output can be:
according to the time step of the input.
5.2 General description of the method
The energy performance is assessed by values of the increased space temperatures due to heat and cooling emission system inefficiencies.
The method is based on an analysis of the following characteristics of a space heating emission system or cooling system including control:
— non-uniform space temperature distribution;
— emitters embedded in the building structure;
— control accuracy of the indoor temperature;
— operation of controls/controls systems and emitters.BS ISO 52031 pdf download.