This section uses the comfort category descriptions from BS EN see Table 101. Note that a space may have different comfort categories for different thermal comfort criteria. For example, sports activities have a category IV for cold draughts, but a category III for the summertime overheating risk assessment. Thermal Comfort Criteria BS EN 15251 thermal comfort criteria are based on the categories shown in Table 10-1. 101 Categories of space/activity Category Explanation I - Equivalent to High level of expectation and also recommended Category A of for spaces occupied by very sensitive and fragile persons with special requirements like some BS EN ISO 7730: 2005 disabilities, sick, very young children and elderly persons, to increase accessibility II - Equivalent to Normal expectation Category B of BS EN ISO 7730: 2005 III - Equivalent to An acceptable moderate level of expectation Category C of BS EN ISO 7730: 2005 IV - No equivalent Low level of expectation. This category shall only category be accepted for a limited part of the year BS EN gives comfort criteria for both mechanically cooled buildings and for running’ buildings. A running’ building is defined as a building, with ‘free ‘free either natural or mechanical ventilation, which is not actively heated or cooled. The thermal comfort criteria for schools in this section are based on: the adaptive thermal comfort standards for running’ buildings outside the ‘free heating season; PD CR 1752:1999; BS EN ISO 7730; and BS EN 15251; and CIBSE Guidance with local interpretation for children and Schools in England. For Refurbished Buildings and Remodelled the minimum standard is Category IV where Category III cannot be met for reasons of practicality and due to the extent of refurbishment. However, after refurbishment the criteria
This section uses the comfort category descriptions from BS EN see Table 101. Note that a space may have different comfort categories for different thermal comfort criteria. For example, sports activities have a category IV for cold draughts, but a category III for the summertime overheating risk assessment. Thermal Comfort Criteria BS EN 15251 thermal comfort criteria are based on the categories shown in Table 10-1. 101 Categories of space/activity Category Explanation I - Equivalent to Category A of BS EN ISO 7730: 2005 High level of expectation and also recommended for spaces occupied by very sensitive and fragile persons with special requirements like some disabilities, sick, very young children and elderly persons, to increase accessibility II - Equivalent to Category B of BS EN ISO 7730: 2005 Normal expectation III - Equivalent to Category C of BS EN ISO 7730: 2005 An acceptable moderate level of expectation IV - No equivalent category Low level of expectation. This category shall only be accepted for a limited part of the year BS EN gives comfort criteria for both mechanically cooled buildings and for ‘free running’ buildings. A ‘free running’ building is defined as a building, with either natural or mechanical ventilation, which is not actively heated or cooled. The thermal comfort criteria for schools in this section are based on: the adaptive thermal comfort standards for ‘free running’ buildings outside the heating season; PD CR 1752:1999; BS EN ISO 7730; and BS EN 15251; and CIBSE Guidance with local interpretation for children and Schools in England. For Refurbished Buildings and Remodelled the minimum standard is Category IV where Category III cannot be met for reasons of practicality and due to the extent of refurbishment. However, after refurbishment the criteria