This paper presents an extension of a standard two-equation turbulence model that can improve considerably the precision of the numerical simulation of a displacement ventilation system.
The evaluation of the performance of existing natural ventilation systems in Lithuania was the objective of this research along with the performance of a CFD analysis to find possible ways to improve them.
The aim of that study was to investigate the energy consumption at different gradients in a field environment chamber in Singapore. The results of the experiment are presented along with the authors ' main conclusions.
For that IAQ evaluation in a 75 storeys office building, the authors used three indicators (CO2, TVOC, PM10) to assist the building engineering management in the identification of possible improvement measures in indoor air quality control
Under contract with the ASHRAE, RTI conducted an interlaboratory study (ILS) ofANSI/ASHRAE Standard 52.2-1999. Seven American and one European laboratories participated.The purpose of the ILS was to determine if the system qualification tests are adequate to providereliable test results. Testing was performed in two rounds :Round 1 was a trial run during which each lab ran an initial efficiency test (no dust loading) on two medium efficiency filters.Round 2 consisted of six full 52.2 tests : two tests each of low (MERV 5-8), medium(MERV 9-12) and high efficiency (MERV 13-16) filters.
The performance of a particulate air filter is mostly based on the filtration efficiency obtained by weight method (for CPA filter) or dust spot method (for MEPA filter). The primary goal of this study was to obtain the filtration efficiency over airborne microbes of a CPA filter or MEPA filter which are normally installed in Japanese office buildings. In-situ tests were carried out on three air-handling units and one package air-conditioner located in Tokyo.
In this paper the development of international standards for filters used in general building ventilation and for gas turbine intake air cleaning is examined. CEN (Comit Europen de Normalisation) and ISO (International Standards Organisation) have working groups with European or worldwide membership to write european or international air filter standards and rating systems.
This paper provides an overview of the performance of a low-energy naturally ventilated building and an explanation of special methods required to assess it. Through monitoring, measuring and observing a naturally ventilated office building in a temperate climate, we now have a better understanding and can better assess the energy, ventilation, thermal and overall building performance and evaluation methods that are unique to naturally ventilated office buildings.
The Adam Joseph Lewis Center for Environmental Studies in Oberlin, Ohio, is a 13,600 ft2 (1,263 m2) academic building designed with a long-term goal of operating as a net energy exporter. The building was designed to consume significantly less energy than a typical building.
Features to achieve the energy savings include daylighting, enhanced thermal envelope, ground-source heat pumps, energy recovery ventilators, a dimming lighting system and natural ventilation. The building is equipped with a 60 kW photovoltaic array.
Variable air volume (VAV) terminal placement has typically been considered good enough in the HVAC industry, regardless of upstream duct geometry that clearly affects the response of the flow sensor. This paper describes the loss of VAV flow sensor amplification, uniformity, and precision
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