Abstract
Although energy analysis techniques can contribute to substantial energy savings in housing stock retrofitting operations, the outcomes often deviate significantly from the predicted results, which tend to overestimate potential savings by overestimating the starting energy baselines, particularly in southern Europe. This deviation can be largely attributed to occupant practice relating to the use of air conditioning facilities and the temperatures at which occupants feel comfortable. The patterns observed differed widely from standard values. In this study environmental variables, primarily indoor air temperature both with and without HVAC, were monitored in occupied dwellings for a full year. The data gathered were supplemented with surveys on occupants’ temperature-related behaviour to define comfort patterns. The findings show that the standards in place are not consistent with actual comfort-accepted patterns in medium- to low-income housing in southern Spain, where energy consumption was observed to be lower than expected, mostly because occupants endure unsuitable, even unhealthy, conditions over long periods of time. A new user profile, better adjusted to practice in southern Europe, particularly in social housing, is proposed to reflect the current situation.
Highlights
This paper is an extended version of work presented at the 10th Windsor Conference [1]
More than half of the city’s dwellings display varying degrees of obsolescence. These buildings originally had no effective thermal insulation measures and display major deficiencies in terms of current energy standards and well-being and hygiene conditions
Recent studies show that a large number of the existing buildings have significantly lower energy demands than those predicted in the national energy assessment procedures [6,7] derived from Directive 2002/91/EEC [8]
Summary
This paper is an extended version of work presented at the 10th Windsor Conference [1]. More than half of the city’s dwellings display varying degrees of obsolescence These buildings originally had no effective thermal insulation measures and display major deficiencies in terms of current energy standards and well-being and hygiene conditions (the first mandatory measures for limiting overall energy demand in buildings only came into effect with the Basic Building Standard on Thermal Conditions in Buildings, NBE CT-79 [3]). The building envelopes of a large part of the current housing stock result in the environmental performance of these dwellings being far from current comfort standards and determine users’ expectations These aspects are important in order to meet the requirements set out in the European Energy Saving Directives [4] and Horizon 2020 targets, as well as national regulations that establish minimum environmental and energy requirements for residential buildings [5]. This issue greatly affects less wealthy population groups, who often cannot afford to invest in artificial indoor climate control
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