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Life-cycle assessment (LCA) of air-handling units with and without air-to-air energy exchangers

The life-cycle assessment (LCA) methodology is used in this paper to assess the environmental effects of air-handling units (AHU) over a 20-year life cycle. This assessment is based on quantifying the consumption of resources (energy and materials), the harmful emissions into the environment (air, water, and soil), and the potential changes in the environment (climate change, acidification, and ozone production).

Wheel selection for heat and energy recovery in simple HVAC ventilation design problems

This paper shows how air-to-air heat and energy system design problems can be formulated for a simple HVAC configuration and solved for the least life-cycle cost system while still retaining a small payback period. Mathematical expressions and design tables are presented to facilitate the design process. The design process is illustrated for the city of Chicago where both large heating and cooling loads occur in HVAC applications. The example design problem presented shows that

An Algorithm of Stereoscopic Particle Image Velocimetry for Full-Scale Room Airflow Studies

One challenge in indoor air quality studies is the measurement of three-dimensional air velocity profiles in an airspace so that the nature of airflow can be better understood and appropriate ventilation systems can be designed. There is much dispute over a variety of computational fluid dynamics (CFD) models, primarily due to a lack of credible data to validate those models. This study aimed to develop a stereoscopic particle imaging velocimetry (SPIV) system suitable for easurement of full-scale room three-dimensional airflow.

Isolation and identification of filamentous fungi from HVAC system

During the research, air samples were taken by exposure of agar plates and taking smearsamples from the AC equipment. Sampling took place during the autumn because theconcentration of spores at that time reaches its peak.

What is behind TVOC in new buildings

This study reports the attained indoor air quality in new buildings when using different M1-classified finishing materials and ventilation systems. It is practical to use the TVOC value asa reference in comparing material emissions, their effect on indoor air quality and infollowing the effect of different parameters on the indoor air quality. But is TVOC a relevanttool from the health point of view to be used in characterizing the indoor air as the singlecompounds contained in the TVOC value do have very different effects on the health andperceived indoor air quality?

Evaluation and demonstration of domestic ventilation systems. VENSET program.

VENSET is a VENtilation Sytems Evaluation Tool for dwellings and is the final result of IEA Annex 27 evaluation and demonstration of domestic ventilation systems.The main idea for this annex was to develop tools to better evaluate domestic ventilation systems in dwellings in various situations. Different systems in various climates must handle situations with a large range of residential behaviour.

Residential dehumidification and ventilation systems research for hot-humid climates

Twenty homes were tested and monitored in Houston, Texas, U.S.A. to evaluate humidity controlperformance and operating cost of six different integrated dehumidification and ventilation systems that could be applied by production homebuilders. Fourteen houses had one of the six integrated dehumidification and ventilation systems and also met a high standard of energy efficiency criteria.

Underfloor & Overhead Ductless VAV Systems

In the 1970's variable-air-volume (VAV) revolutionized the use of air-conditioning for commercial buildings. Now a new revolution is underway with the ductless VAV systems.This article describes the two main types of ductless VAV systems (underfloor and overhead) and explore their benefits such as easier design, lower energy consumption, reduced building-faade costs, improved air quality.

Demonstrating automated faults detection and diagnosis methods in real buildings

The objective of the annex 34 was to develop HVAC fault detection and diagnosis tools, which are closed to commercial products. The approach was to design a number of different computer based demonstration systems that could be interfaced to HVAC processes in buildings. By monitoring the operation of these demonstration systems, researchers were able to test a variety of fault detection and diagnosis methods and technique in a real environment, find possible shortcomings and obtain new ideas for further development.

Advanced ventilation and integrated energy systems for low energy retrofit buildings. A summary from the Sustainable Building Retrofit (SUBURET) Workshop

In the frame of the IEA Future Buildings Forum, a workshop was held January 15 -17 2003 in St. Moritz, Switzerland. The goal of the proposed workshop was to discuss and to decide upon an international collaboration to promote a program for advanced retrofit of existing buildings and community systems.
The proposed topics dealing with energy conservation and renewable energy use in retrofit buildings were:

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