English

That study investigated the possibility of using a regenerative desiccant rotor for air purification.A laboratory study was carried out in a climate chamber, a dehumidifier with a silica gel desiccant rotor was installed within it to treat the recirculation airflow.A Proton-Transfer-Reaction - Mass Spectrometry (PTR-MS) gas analyzer was used for the measurement of VOCs concentration upstream and downstream of the desiccant rotor.The experiment confirmed that indoor humidity has little influence on the effectiveness of VOC removal by a desiccant rotor and that this technique is efficie

Field research performed in 70 central Florida homes found that return grilles are almost always located in the central zone of the house and that individual rooms rarely have ducted returnair or return transfer pathways. When interior doors were closed, the closed rooms went to +0.0249 inches of water gauge (in. w.g.) (+6.2 pascals [Pa]) wrt outdoors (wrt = with respect to) and thecentral zone went to 0.0116 in. w.g. (2.9 Pa) wrt outdoors.Room pressures as high as +0.150 in. w.g. (+37.3 Pa) and central zone pressure as low as 0.059 in. w.g. (14.7 Pa) wrt outdoors were found.

Prior to 2005, there was not a recognized test method in the United States for determining the grease removal efficiency of mechanical filters used in kitchen ventilation systems. It wasnt uncommon for manufacturers to claim 90% grease removal efficiencies or higher based on test results that simulated conditions not representative of commercial kitchens. It has only been in the last few years that data on the true character of grease emissions from common kitchen applianceshave been available.

The Iowa Association of Municipal Utilities (IAMU) office and training headquarters is a pioneering building designed in 1997 that helped define and embody high-performance sustainable design on a speculative office building budget.This project was selected by the American Institute of Architects National Committee on the Environment as one of its Top Ten Green Projects in the United States in 2002.For this 12,500 ft2 (1,161 m2) office and training facility, effective interior daylighting became a main organizing element for the architectural concept.

The flow of air through the porous media that is used as building insulation has the potential to recover energy normally lost through the building envelope via conduction. In essence, the walls of a building can be used as a crude heat exchanger, the effectiveness of which depends on the flow

The use of an underfloor plenum to deliver conditioned air directly into the occupied zone of a building is one of the key features that distinguish underfloor air distribution systems from conventional ducted overhead systems. This paper describes the development, validation, and application of a computational fluid dynamics (CFD) model for predicting the airflow and thermal performance of underfloor air supply plenums. To provide validation data for comparison with the

Experiments with room air distribution that is generated by a radial ceiling-mounted diffuser and a diffuser generating flow with swirl are compared with the air distribution obtained by mixing ventilation from a wall-mounted diffuser, vertical ventilation, and displacement ventilation. The air distribution generated by a radial diffuser is partly controlled by the momentum flow from the diffusers and partly from gravity forces where the thermal load and the temperature difference between room air and supply air deflect the radial wall jet down into the occupied zone.

Volatile organic compounds (VOCs) are major gas-phase indoor air pollutants, and filtration is one of the promising methods to control indoor VOC concentration levels. An adsorption technique is commonly used for filtration of VOCs using adsorbents such as activated carbon. Unlike a particlefilter system, the applications of gas-filter systems have not been widely studied, and standards for the evaluation of gasfilter systems do not exist. As groundwork for standards development, this study proposes an experimental method that can evaluate the performance of gas filters in removing VOCs.

Because of their ability to improve building air quality and their potential to reduce energy usage in some climates by allowing more conditioned air recirculation, use of gas contaminant filters in buildings is increasingly considered. Air cleaning is an option under ASHRAE Standard 62 and is

This paper provides a method for verifying the accuracy of computer models that simulate the performance of the airhandling components of four types of heating, ventilating, and air-conditioning systems: the dual-fan VAV dual-duct system, the single-zone system, the four-pipe fan coil system, and the four-pipe induction system. To accomplish this, a detailed description of each system and its operating parameters was developed and a set of eight test conditions was generated, consisting of carefully chosen space loads and weather conditions.