As part of IEA Annex 35 "Hybrid Ventilation in New and Retrofitted Office Buildings" a number of pilot study buildings are monitored for demonstration of hybrid ventilation performance. The monitoring programmes investigates the performance regarding indoor air quality (IAQ), thermal comfort, control strategies and energy consumption. This paper presents detailed measurements from the Danish contribution. Detailed results from short-term measuring periods are presented.
This paper investigated design methods of utilising tunnel air for ventilation and prediction methods of distributing state for indoor thermal environment utilizing tunnel air for ventilation in one year in an office building, provided a series of program for design and prediction, and performed verification for a concrete engineering example.
The new office building of the Ministry of Transport at Terneuzen in the Netherlands is a sustainable and energy efficient building with a good indoor environment. The building is constructed of sustainable materials, well insulated, has a good daylight situation and is equipped with a minimum of building services. Passive and natural sources have been utilised as much as possible. An advanced natural ventilation system provides the fresh air and controls the thermal comfort.
The aim of this paper is to identify the weak points in nowadays ventilation installations in Belgium and to discuss energy performance approach of buildings as a way to solve many of the ventilation related problems.
Describes a simple design tool called the 'office building module' (OPTI), which is intended to help building professionals to incorporate the impact of design choices on energy consumption when designing a project. Emphasises the importance of the program's user-friendliness, minimisation of data and speed. Dynamic thermal programs are needed to compute energy needs and estimate overheating. Current programs suffer from slowness and the need for large amounts of data.
Describes a three-year EU funded research project into the application of passive downdraught evaporative cooling (PDEC) to non-domestic buildings. This paper specifically discusses the use of computational fluid dynamics (CFD) to model PDEC. Using a hypothetical office building in Seville, Spain, it describes modelling techniques used and applications in an investigation of the building's performance.
Makes a comparison between the effects on thermal performance and energy use of a number of pre-cooling and ventilation strategies, suitable for use to reduce peak power demands in office buildings in moderate temperature regions. Describes how simulations were performed for different building envelope parts, and for two levels of internal heat load. Lists the results as significant reductions of required daytime peak power loads which may be obtained by cooling strategies that contribute to lowering the internal mass temperatures.
The office workers in Bangkok are accustomed to their environments of a hot-humid climate, resulting in a wider range of acceptable temperatures and higher comfort zone than the recommendation in moderate climate countries. This gives the possibility to use natural ventilation as a tool to provide occupants preference and comfort zone in office buildings, considering a short time experience.
Describes an investigation of the indoor air quality of a music company at their New York City office. The office was on the 31st floor of a block. Recommendations for producing better IAQ were as follows: 1) Recalibrate return airflows where needed to harmonise them with the values specified in the HVAC system design. At the same time verify and adjust airflows from the supply-air diffusers. The amount of outdoor air should comply with the ASHRAE Standard 62.1-1999 industry guideline of 20 ft2 per person per minute in offices.
Describes how engineers retrofitted a modern heating, ventilation and air conditioning (HVAC) system, controls and other energy saving modifications into a neoclassic 19th century building. The problems involved preserving the building's appearance, working while the occupants were present and difficulties in modifying occupant behaviour by means of memoranda to instruct them about how to produce maximum energy savings and indoor environmental comfort.
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