Performance Of Underfloor Air Distribution In A Fieldsetting

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Performance Of Underfloor Air Distribution In A Fieldsetting

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Author :
language : en
Publisher:
Release Date : 2005

Performance Of Underfloor Air Distribution In A Fieldsetting written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.

Underfloor air distribution (UFAD) is a new method of supplying heated or cooled air throughout a building. Reported advantages of UFAD include energy savings and improved indoor air quality (IAQ). We measured several aspects of the performance of an UFAD system installed in a medium-size office building. The measured air change effectiveness was very close to unity, which is comparable to that measured in buildings with typical overhead air distribution. The pollutant removal efficiency for carbon dioxide was 13% higher than expected in a space with well-mixed air, suggesting a 13% reduction in exposures to occupant generated pollutants. The increase in indoor air temperatures with height above the floor was only 1 to 2 C. This amount of thermal stratification could reduce the sensible energy requirements for cooling of outdoor air by approximately 10%. The occupant's level of satisfaction with thermal conditions was well above average and this high satisfaction rating could possibly be due, in all or part, to the use of a UFAD system. The results of this study provide some evidence of moderate energy and IAQ-related benefits of UFAD. Before general conclusions are drawn, the benefits need to be confirmed in other studies.

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Author :
language : en
Publisher:
Release Date : 1954

written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1954 with categories.

Underfloor Air Distribution Ufad

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Author : Liangcai Tan
language : en
Publisher:
Release Date : 2008

Underfloor Air Distribution Ufad written by Liangcai Tan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Air conditioning categories.

This project covered the laboratory investigation phase of Task 2 where the performance and cost effectiveness of underfloor air distribution and conventional air distribution systems were compared.

Performance Assessment Of Commercial Underfloor Air Distribution Buildings

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Author : Yoon Soo Lee
language : en
Publisher:
Release Date : 2009

Performance Assessment Of Commercial Underfloor Air Distribution Buildings written by Yoon Soo Lee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

Energy Performance Of Underfloor Air Distribution Systems

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Author :
language : en
Publisher:
Release Date : 2007

Energy Performance Of Underfloor Air Distribution Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Air quality categories.

A Study Of The Thermal Comfort And Ventilation Performance Of An Underfloor Air Distribution System

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Author : Jae D. Chang
language : en
Publisher:
Release Date : 2007

A Study Of The Thermal Comfort And Ventilation Performance Of An Underfloor Air Distribution System written by Jae D. Chang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Performance And Optimization Of An Underfloor Air Distribution System In An Educational Building In A Hot And Humid Climate

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Author : Vasiliy Khmelenko
language : en
Publisher:
Release Date : 2015

Performance And Optimization Of An Underfloor Air Distribution System In An Educational Building In A Hot And Humid Climate written by Vasiliy Khmelenko and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

Today there is a proliferation of different HVAC system configurations. Design and performance of each HVAC system are dependent on climate and the intended use of the building. Energy recovery ventilation is becoming more common in new buildings and is one of the more popular retrofit options in hot and humid climates. Currently there is a lack of optimization strategies that involve the underfloor air systems combined with Energy Recovery Ventilation (ERV) especially in hot and humid climate. This thesis examines the performance and optimization of underfloor air distribution systems (UFAD) in hot and humid climates. This thesis also compares the UFAD system performance to a typical overhead air handler unit (AHU) system found in Texas. The performance comparison is done with EnergyPlus modeling software. Separate sets of models are created to examine performance of at different operational parameters. The minimum air flow rates are modeled at 0.1 cfm/ft2, 0.2 cfm/ft2, 0.3 cfm/ft2, 0.4 cfm/ft2 for both UFAD and overhead (OH) systems. The supply air temperatures were modeled at 55°F, 60°F, and 63°F. Outside air strategies include simple economizer, energy recovery ventilation (ERV), as well as a combination of both economizer and ERV. The study found that at low minimum (0.1 cfm/ft2) flow rates an overhead system will slightly outperform a UFAD system (OH 2.6% cheaper to operate than UFAD) while at 0.3 cfm/ft2 a UFAD system is more efficient (UFAD 14.8% cheaper to operate). The outside air strategies have the same energy savings effect on both systems. The UFAD system has a higher peak cooling load and a lower peak heating load compared to the overhead system. This thesis also covers the stratification and supply air temperature measurements within two offices inside the Mitchell Physics building, located on the Texas A&M campus. The stratification measurements showed that on average the stratification was lower than expected for such systems with office 411 having average stratification of 1.8°F and office 423 average stratification of 1.5°F. Temperature measurements at the diffuser level showed some reheat, especially during unoccupied periods such as early mornings, late evenings and weekends, even when the outside temperature was above the interior thermostat set point. System level total supply air flow rate showed little variation with a minimum of 0.47 cfm/ft2 and a maximum of 0.59 cfm/ft2. The analysis of energy recovery wheel operation concluded that the low exhaust air flow of only 0.2 of the outside air is responsible for the low temperature difference observed in the outside air stream through the ERV. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155245

An Examination And Analysis Of Residential Applications Of Under Floor Air Distribution Systems Using A Realistic Test Environment And Methodology To Assess Thermal Performance For Heating And Cooling Conditions

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Author : Ryan D. Meyer
language : en
Publisher:
Release Date : 2011

An Examination And Analysis Of Residential Applications Of Under Floor Air Distribution Systems Using A Realistic Test Environment And Methodology To Assess Thermal Performance For Heating And Cooling Conditions written by Ryan D. Meyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Dwellings categories.

Under Floor Air Distribution systems hold significant potential for improving residential heating and cooling efficiency and effectiveness. A versatile, realistic residential UFAD system testbed is essential to research establishing the feasibility and commercial potential for these systems. This research work established an operating testbed and a complete testing and analysis methodology for assessing residential UFAD system thermal performance. The testbed supported experiments examining multiple diffuser configurations under both heating and cooling conditions. This research also examined the potential for integrating numerical methods with experimental data from a realistic residential test facility. Analysis of the collected experimental data showed excellent air distribution performance for nearly all diffuser configurations. Experimental data measured minimal temperature stratification and showed UFAD system heating performance equal to cooling performance. This research established Wyoming's first permanent residential UFAD system test environment supporting a broad range of future research.

Room Air Stratification Model For Underfloor Air Distribution System

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Author : Qiang Zhang
language : en
Publisher:
Release Date : 2001

Room Air Stratification Model For Underfloor Air Distribution System written by Qiang Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Ufad O M Guide

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Author : ASHRAE.
language : en
Publisher:
Release Date :

Ufad O M Guide written by ASHRAE. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with TECHNOLOGY & ENGINEERING categories.

"A comprehensive guide on the operations and maintenance of underfloor air distribution systems. Offers practical advice for the builder, technician, and building owner or their representative"--