Energy Performance Of Underfloor Air Distribution Systems
DOWNLOAD
Download Energy Performance Of Underfloor Air Distribution Systems PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get Energy Performance Of Underfloor Air Distribution Systems book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages. If the content not found or just blank you must refresh this page
Energy Performance Of Underfloor Air Distribution Systems
DOWNLOAD
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.
Underfloor Air Distribution Ufad Design Guide
DOWNLOAD
Author : Fred S. Bauman
language : en
Publisher: Bibliotheca Press
Release Date : 2003
Underfloor Air Distribution Ufad Design Guide written by Fred S. Bauman and has been published by Bibliotheca Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Technology & Engineering categories.
This guide is ideal for HVAC design engineers, architects, building owners, facility managers, equipment manufacturers and installers, utility engineers, researchers, and other users of underfloor air distribution (UFAD) technology. UFAD systems are innovative methods for delivering space conditioning in offices and other commercial buildings. Improved Thermal Comfort, Improved Ventilation Efficiency and Indoor Air Quality, Reduced Energy Use and Reduced Life-Cycle Building Costs -- The guide explains these as some of the advantages that UFAD systems have over traditional overhead air distribution systems. This guide provides assistance in the design of UFAD systems that are energy efficient, intelligently operated, and effective in their performance. It also describes important research results that support current thinking on UFAD design and includes an extensive annotated bibliography for those seeking additional detailed information.
Bs Iso 7615 1 Energy Performance Of Building Systems Underfloor Air Distribution Systems
DOWNLOAD
Author : British Standards Institution
language : en
Publisher:
Release Date : 2023
Bs Iso 7615 1 Energy Performance Of Building Systems Underfloor Air Distribution Systems written by British Standards Institution and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Ufad Guide
DOWNLOAD
Author : Ashrae
language : en
Publisher: Ashrae
Release Date : 2013
Ufad Guide written by Ashrae and has been published by Ashrae this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Air conditioning categories.
"Guide provides assistance in the design of UFAD systems that are energy efficient, intelligently operated, and effective in their performance. It also describes important research results that support current thinking on UFAD design"--
Underfloor Air Distribution Ufad
DOWNLOAD
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
DOWNLOAD
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.
A Study Of Time Dependent Responses Of A Mechanical Displacement Ventilation Dv System And An Underfloor Air Distribution Ufad System
DOWNLOAD
Author : Jong Keun Yu
language : en
Publisher:
Release Date : 2010
A Study Of Time Dependent Responses Of A Mechanical Displacement Ventilation Dv System And An Underfloor Air Distribution Ufad System written by Jong Keun Yu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
As alternative systems for saving cooling energy compared to conventional overhead (OH) air-conditioning systems, mechanical displacement ventilation (DV) systems and underfloor air distribution (UFAD) systems have been widely adopted for commercial buildings. In these alternative systems, supply air is discharged from low momentum diffusers located at lower positions close to the floor in the DV system, and the supply air of the UFAD system is distributed by an underfloor plenum and discharged from floor diffusers. To predict transient vertical temperature responses when the heat source or the ventilation flow rate vary in time, we introduce transient two-layer stratification models of the DV and UFAD systems, non-dimensionalize them by competing the filling box time (Baines & Turner 1969) and the replenishment time in which all the air in the enclosure is replaced by supply air and validate them by laboratory experiments using a salt-water analogy. In various scenarios of the heat source and the ventilation flow rate, the models show a good agreement with the laboratory experiments. Building energy simulation, which predicts cooling and heating demands of a building, has been used for building design, environment, economics, and occupant comfort. EnergyPlus, which is a building energy simulation tools developed by the U.S. Department of Energy, has integrated capability to predict cooling and heating demands as well as the HVAC (heating, ventilation and air conditioning) energy consumption. To evaluate performance of energy savings of UFAD, we developed prototype office buildings adopting OH and UFAD, and the UCSD-UFAD model was used to estimate realistic cooling and heating demands by simulating the stratified temperature profile in a room. In Californian climates, annual electricity consumption of UFAD is always lower than that of OH by up to 20 %, since UFAD has more opportunities to utilize the economizer ``free cooling" compared to OH. For electricity demand reduction of various Demand Response (DR) activities, increasing room set point temperature is the most effective DR activity and UFAD has higher peak demand reduction compared to OH by approximately 6-10 % when the room set point temperature is higher than 26 Celsius.
DOWNLOAD
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.
Performance And Optimization Of An Underfloor Air Distribution System In An Educational Building In A Hot And Humid Climate
DOWNLOAD
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
Performance Of Underfloor Air Distribution In A Fieldsetting
DOWNLOAD
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.
