Technologies in balanced ventilation systems to maintain optimal performance in energy and comfort

Measurements of the installed base of balanced ventilation systems in houses often show that optimal performance is not achieved. The installed base however, is a mix of various generations of units that have been developed over the years, starting in 1980. As a result, energy benefit and perceived comfort for residents is underestimated. Since 2015, improved knowledge has led to new technologies that have been implemented in the newest generation balanced ventilation units.

The evaluation of real-time indoor environment parameters measured in 297 Chilean dwellings

People spend the majority of their time in their own homes and so the indoor environmental conditions are an important determinant of population health and wellbeing and have economic consequences. Chile is undergoing rapid economic growth and is managing its national energy demand to minimize its greenhouse gas emissions. Its housing stock is growing rapidly, and is responsible for 15% of national energy demand. Accordingly, there is a need to understand the performance of the stock by measuring parameters that indicate air quality, thermal comfort, and energy demand.

Automated window opening control system to address thermal discomfort risk in energy renovated dwellings. Summertime assessment

Major and deep energy renovations of single-family houses (more than 60% of the building stock) are expected in Europe over the next several years (Psomas et al., 2016a). A number of research projects have documented and verified overheating risk during the design and operation phase in nearly zero energy or existing renovated single-family houses without mechanical cooling systems in temperate climates. Post occupancy surveys and comfort studies have also monitored high indoor temperatures over 27oC and 28oC even in Northern countries (Psomas et al., 2016a).

A New Hybrid Thermal Comfort Guideline for the Netherlands (ISSO 74: 2014)

In 2004 the first adaptive thermal comfort guideline was introduced in the Netherlands. Recently a new, upgraded version of this ISSO 74 (ATG) guideline has been developed. The new requirements are hybrid in nature as the 2014 version of the guideline combines elements of traditional non-adaptive comfort standards with elements of adaptive standards. This paper describes the new guideline and explains the rationale behind it. Also changes in comparison with the original 2004 version and issues related to performance verification are discussed.

Presenting LOBSTER, an innovative climate chamber, and the analysis of the effect of a ceiling fan on the thermal sensation and performance under summer conditions in an office-like setting

Thermal comfort studies have been performed so far either in closed climate chambers with controlled conditions or non-controlled conditions during field studies. Detailed analyses of mechanisms behind the adaptive comfort models are therefore hardly possible. This paper presents a newly constructed climate chamber in Karlsruhe (Germany) along with the complete chain from subjective experiments, via data analyses, model development and implementation into dynamic building energy simulation until the formation of a decision base for or against a renovation measure for a confined case.

Adaptive comfort opportunities under mechanically conditioned environment

Despite being provided by mechanical ambient conditioning systems or not, all building have to a certain extent a degree of adaptation. Studies have shown that with either a weak or strong dependency to outdoor conditions there always are adaptive opportunities that might have a significant impact on comfort perception.

Do the constants used in adaptive comfort algorithms reflect the observed responses of children in junior school classrooms?

This paper compares the values used for the Griffiths constant (G=0.5) and the running mean constant (α=0.8) in adaptive comfort algorithms with the values calculated from thermal comfort field surveys in two naturally ventilated junior schools in Southampton, UK. The surveys were conducted outside the heating season in 2011 and 2012 respectively, including both questionnaire surveys and environmental monitoring. A total of 2693 pupil responses were used for this analysis.

Thermal judgements and adaptive behaviours: a study on the subjective side of thermal comfort in two University buildings in France.

This paper presents some of the results of a field study carried out in 2013 in two University buildings in Paris and in Champs-sur-Marne, nearby Paris. The aim of the study was to examine students‟ thermal judgements and thermal adaptation by combining an objective and a subjective approach. First is presented a comparison between “real” thermal responses (thermal sensation, preference, acceptability) and predicted ones (Predicted Mean Vote, Predicted Percentage of Dissatisfied), after which follows an analysis of students‟ actions to improve their thermal comfort.

Individual Thermal Control in the Workplace and Changes in Thermal Preferences in a Day: Norwegian Cellular vs. British Open Plan Layouts

This research suggests that the thermal preference of occupants is subject to change; hence, a particular thermal setting may not be able to constantly satisfy everyone. On the contrary, individual thermal control in the workplace is more likely to increase user comfort and satisfaction. This is examined through environmental measurements, comfort surveys and semi-structured interviews in two office layouts with high and low thermal control.

Adaptive comfort relations and comfort temperature ranges from a field study in undergraduate laboratories

To ascertain comfort levels and effectiveness of available adaptive opportunities for classrooms in the hot-humid regions of India, a thermal comfort field study was conducted in an undergraduate laboratory class in Kharagpur. The study, carried out between January and April 2013, had participation from 121 students and yielded 338 responses. Analysis of the results showed that comfort temperatures found in the field study had close resemblance to the predicted comfort temperatures evaluated from certain existing standard adaptive comfort equations.