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EVS-EN ISO 13790:2008

Energy performance of buildings - Calculation of energy use for space heating and cooling

General information

Withdrawn from 02.08.2017
Base Documents
ISO 13790:2008; EN ISO 13790:2008
Directives or regulations
None

Standard history

Status
Date
Type
Name
02.08.2017
Main
08.05.2008
Main
Main
EVS-EN 832:2001
Main
EVS-EN ISO 13790:2004
This International Standard gives calculation methods for assessment of the annual energy use for space heating and cooling of a residential or a non-residential building, or a part of it, referred to as “the building”. This method includes the calculation of: a)  the heat transfer by transmission and ventilation of the building zone when heated or cooled to constant internal temperature; b)  the contribution of internal and solar heat gains to the building heat balance; c)  the annual energy needs for heating and cooling, to maintain the specified set-point temperatures in the building – latent heat not included; d)  the annual energy use for heating and cooling of the building, using input from the relevant system standards referred to in this International Standard and specified in Annex A. The building can have several zones with different set-point temperatures, and can have intermittent heating and cooling.
The calculation interval is either one month or one hour. For residential buildings, the calculation can also be performed on the basis of the heating and/or cooling season. This International Standard also gives an alternative simple hourly method, using hourly user schedules (such as temperature set-points, ventilation modes or operation schedules of movable solar shading). Procedures are given for the use of more detailed simulation methods to ensure compatibility and consistency between the application and results of the different types of method. This International Standard provides, for instance, common rules for the boundary conditions and physical input data, irrespective of the calculation approach chosen. Special attention has been given to the suitability of this International Standard for use within the context of national or regional building regulations. This includes the calculation of an energy performance rating of a building, on the basis of standardized conditions, for an energy performance certificate. The result can have legal implications, in particular when it is used to judge compliance with minimum energy performance levels, which can, for instance, be required to obtain a building permit. For such applications, it is important that the calculation procedures be unambiguous, repeatable and verifiable. A special situation is the calculation of the energy performance in the case of old existing buildings, if gathering the full required input would be too labour-intensive for the purpose, relative to the cost-effectiveness of gathering the input. In this case, it is
important that the calculation procedures provide the right balance between accuracy and data collection costs. To accommodate the application for these and other situations, this International Standard offers different choices. It is up to national bodies whether or not to choose a specific option for mandatory use, e.g. depending on the region in the country, the type of building and its use, and on the purpose of the assessment. Annex H provides some information on the accuracy of the method. This International Standard has been developed for buildings that are, or are assumed to be, heated and/or cooled for the thermal comfort of people, but can be used for other types of building or other types of use (e.g. industrial, agricultural, swimming pool), as long as appropriate input data are chosen and the impact of special physical conditions on the accuracy is taken into consideration. NOTE 1  For instance, it can be used when a special model is needed but is missing. Depending on the purpose of the calculation, it may be decided nationally to provide specific calculation rules for spaces that are dominated by process heat (e.g. indoor swimming pool, computer/server room or kitchen
in a restaurant). NOTE 2  For instance, in the case of a building energy certificate and/or building permit, e.g. by ignoring the process
heat or using default process heat for certain processes (e.g. shops: freezers, lighting in shop window). The calculation procedures in this International Standard are restricted to sensible heating and cooling. The energy use due to humidification is calculated in the relevant standard on the energy performance of ventilation systems, as specified in Annex A; similarly, the energy use due to dehumidification is calculated in the relevant standard on the energy performance of space cooling systems, as specified in Annex A.
The calculation is not used to decide whether mechanical cooling is needed. This International Standard is applicable to buildings at the design stage and to existing buildings. The input data directly or indirectly called for by this International Standard should be available from the building files or the building itself. If this is not the case, it is explicitly stated at relevant places in this International Standard that it may be decided at national level to allow for other sources of information. In this case, the user reports which input data have been used and from which source. Normally, for the assessment of the energy performance for an energy performance certificate, a protocol is defined at national or regional level to specify the type of sources of information and the conditions when they may be applied instead of the full required input.

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