Intercomparaison test of ventilation heat recovery units in houses

The CEN TC 156 / WG2 (ventilation for residential buildings) has prepared a new European draft for the test method of Heat Recovery Units (prEN 13141-7). This method should ensure a common way of testing these units all over Europe. In order to determine if the draft procedure is sufficient enough, both VTT and CETIAT has proceeded to some tests according to the new European standard on the same unit. Results on this first intercomparison give interesting data on the test method applied.

Office cooling with air or with chilled beams from an energy perspective

Even in cold climates, offices normally need to be cooled due to the internal heat loads from people, equipment and lighting. Either a chilled ceiling or chilled beams with cooled water as medium or chilled air can be used. In the case with chilled ceiling or chilled beams, a constant air volume system (CAV) is used. In the case of air only, a variable air volume (VAV) system must be used. This paper presents the advantages of the two methods of cooling with respect to energy use, which was calculated from climate data.

Economical impact of improved air quality in office buildings in cold climate

The annual energy cost and first cost of the HVAC system, life-cycle costs (LCC) and benefits of improved productivity were simulated in an office building located in a cold climate when improvements of air quality were made by increasing the outdoor air supply rate and by reducing the pollution loads. The building was ventilated by a variable air volume (VAV) system with an economizer or a constant air volume (CAV) system with heat recovery. The pollution loads were assumed to be similar to those in a non-low-polluting or low-polluting building.

International workshop on implementation of European directive on energy performance of buildings

As part of the European SAVE project ENPER, an international workshop on the implementation of the European Energy Performance Directive (EPD) was organised in Brussels on May, 19. Some 115 delegates from 21 countries attended this workshop. This directive obliges the Member states as well as the 10 candidate members to implement a range of regulatory measures regarding the energy performance assessment and certification of buildings. Presentations were made by the people listed above in the author grid.

Three examples of improvement of ambient conditions in industrial premices

Three experiments aiming at improving the atmosphere in industrial premices are described in this paper. The working conditions of the staff have been improved along with an amelioration of the process and quality of fabrication.The third example proves that a well adapted technical approach allows the improvement of working conditions coupled with an energy control.

Directive 2002/91/EC of the European Parliament and of the Council of 16 December 2002 on the energy performance of buildings

The objective of this European Directive, which has to be transposed in national laws in European countries before 4 January 2006, is to promote the improvement of the energy performance of buildings, taking into account outdoor climatic conditions and local conditions, as well as indoor climate requirements and cost-effectiveness.
The directive lays down esuirements as regard :
a - the general framework for a methodology of calculation of the integrated energy performance of buildings (including aspects such as ventilation and indoor climatic conditions);

Experimental comparison of characteristics between ceiling-based system and floor-based system using CAV HVAC system in cooling period

This study compares indoor climate, cooling efficiency and energy consumption of an underfloor air distribution system and a ceiling-based system in a test chamber. Floor-based system appears to provide better thermal conditions with lower electricity consumption.

A tool for thermal analysis of conceptual design

In contemporary architectural design, the indoor climate receives little attention. Most architects are not familiar with the typical problems and solutions involved in climate design. However, it is this relation that provides much control over the initial climate conditions and can prevent costly artificial solutions. As a result, many design decisions are made without insight into the consequences on the indoor climate.

Dynamic building energy modeling: the significance of tuning based on measurements

This paper presents 3 full-scale test rooms in a series of 14 built in Italy, with different types of façades. The measurements of energy consumption and indoor environment allow a direct comparison between different solutions exposed to identiacal climat

Assessing the energy impact of ventilation and infiltration in multi-unit residential buildings

The study was to evaluate energy use of ventilation system with supply in corridors and exhaust in wet rooms. The field test protocol was to measure energy use one day with corridor supply ventilation on, one day off, for a range of different outdoor temperatures in winter. When corridor supply is on, the internal pressure changes (although always negative) and infiltrations are modified.