ISO 18523-1:2016 specifies the formats to present schedule and condition of building, zone and space usage, which is to be referred to as input data of energy calculations for non-residential buildings.
The schedule and condition include schedules of occupancy, operation of technical building systems, ventilation rate, hot water usage and internal heat gains due to occupancy, lighting and equipment.
ISO 18523-1:2016 also gives categories of building, zone and space according to differentiating schedule and condition.
Depending on necessary minuteness of the energy calculation, different levels of schedule and condition from the view point of time and space averaging are specified.
The values and categories for the schedule and condition are given in annexes for more information for the application when the users of this document do not have detailed information on the values and categories for the schedule and condition.
The schedule and condition in this document is basically different from assumptions in order to determine the size of technical building systems in the process of design, where possible largest values are to be assumed. Instead, most usual and average values, which are assumed for the building energy calculation, are dealt with in this document.

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This document specifies requirements for indoor environmental parameters for thermal environment,
indoor air quality, lighting and acoustics and specifies how to establish these parameters for building
system design and energy performance calculations.
This European Standard includes design criteria for the local thermal discomfort factors, draught, radiant
temperature asymmetry, vertical air temperature differences and floor surface temperature.
This European Standard is applicable where the criteria for indoor environment are set by human
occupancy and where the production or process does not have a major impact on indoor environment.
This European Standard also specifies occupancy schedules to be used in standard energy calculations
and how different categories of criteria for the indoor environment can be used.
The criteria in this European Standard can also be used in national calculation methods. This standard
sets criteria for the indoor environment based on existing standards and reports listed under normative
references or in the bibliography.
This European Standard does not specify design methods, but gives input parameters to the design of
building envelope, heating, cooling, ventilation and lighting.

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This standard provides a systematic, comprehensive and modular overall structure on the integrated energy performance of buildings, in order to ensure consistency among all CEN standards required to calculate the energy performance of buildings according to the EPBD (2010/31/EU).
This standard handles the framework of the overall energy performance of a building, covering inter alia:
a)   common terms, definitions and symbols;
b)   building and system boundaries;
c)   building partitioning;
d)   methodology for calculating the energy performance of a building (set of overall formulae on energy used, delivered, produced and/or exported at the building site and near-by);
e)   set of overall formulae and input-output relations, linking the various elements relevant for the assessment of the overall energy performance of buildings which are treated in separate standards;
f)   general requirements to standards dealing with partial calculations;
g)   general rules in setting out alternative calculation routes according to the calculation scope and requirements;
h)   rules for the combination of different partitioning;
i)   performance indicators;
j)   methodology for measured energy performance assessment.

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The work concerns revision of existing standard EN ISO 13790. The scope will change. This revised international standard will provide calculation methods for assessment of the sensible and latent energy needs 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 calculates, for a thermal zone in a building, the sensible and latent thermal energy needs based on the balance between the heat and moisture transfer by transmission and ventilation and the internal and solar heat gains. The energy needs are calculated by an hourly or monthly method. The hourly calculation method will be described in EN ISO 52017-1 (upgraded version of simple hourly method). The monthly method will be given in this standard including procedures how to derive monthly correlation coefficients from hourly calculations. The following input values and boundary conditions are obtained from other standards in the EPB series: overall routing of the energy performance calculation; occupancy patterns and conditions of use; thermal zoning of the building; environment conditions, thermal, dynamic (mass) and solar characteristics of building elements and their junctions; air infiltration and ventilation and ventilation system characteristics. Moisture absorption and desorption in building elements will not be considered. Because some of the characteristics that are input for the calculation are also dependent on the thermal balance calculation, many interactions will have to be accounted for at the level of each time step. The standard will contain simplified approaches for the energy balance in adjacent spaces that are not heated or cooled, including sunspaces

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