ASHRAE Journal - October 2021 - 78

RESEARCH REPORT
mental Impacts and Sustainability
Support of operating engineers and operations is critical to realizing
ASHRAE's core mission of creating better building environments. If we
stop at design, we fall short of fulfilling the potential of our knowledge.
ASHRAE has a great deal of credibility to gain by taking on responsibility
for achieving high performance buildings across their full life cycle. In
doing so, ASHRAE stands to gain strength and prominence as a source
of fundamental knowledge in alliances with major national organizations
such as USGBC, BOMA, IFMA, NIBS and agencies such as US DOE, NIST,
FEMP, GSA and state level energy agencies.
1661-RP Development and Validation of Dynamic Models
August 1, 2017 to April 2021 (P); University of Colorado, Principal Investigator, Wangda Zuo; TC
4.7, Energy Calculations
This project will evaluate the performance of current control sequences
for water side economizers published in ASHRAE publications and recommend
a new near-optimal control sequence. It will also provide validated
dynamic models to ASHRAE and will demonstrate their use for control
sequence evaluation. The project allows the close interaction among experts
in energy modeling (TC 4.7), controls (TC 1.4) and smart building systems
(TC 7.5) using dynamic modeling of energy transports, control systems
and smart control algorithms.
1666-RP Experimental Evaluation of the Thermal and
April 2016 - Completed March 2020; Purdue University; Principal Investigator, Qingyan Chen;
TC 5.3, Room Air Distribution
The experimental results and recommendations will produce previously
unavailable new design and operating guidelines for the combined system of
displacement ventilation with passive beams. The improved understanding
achieved from this project will allow this promising integrated technology
to be considered more confidently by system designers. This will reinforce
the value of ASHRAE guidelines to building system designers and help to
ensure mechanical system design and installation provides comfort while
supporting ASHRAE's net-zero energy design strategies.
1675-RP Guidance for CFD Modeling of Data Centers
April 2016 - March 2021 (P); Florida International University; Principal Investigator, Cheng-Xian
Lin; TC 4.10, Indoor Environmental Modeling; co-sponsored by: TC 9.9, Mission Critical Facilities,
Data Centers, Technology Spaces and Electronic Equipment
The primary objective of this research project is to provide CFD modeling
guidance for data center applications. The guidance will be based on
experimental and CFD analyses of several data center configurations to
be conducted as part of this study as well as other work available in the
literature.
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ASHRAE JOURNAL ashrae.o rg O CTO B E R 2021
Ventilation Performance of Stratified Air Distribution
Systems Coupled with Passive Beams
for the Control of Chiller Plants with Water Side
Economizer
1677-RP Measurements and Prediction of Waterside Fouling
September 2013 - February 2021 (P); University of Illinois, Urbana-Champaign., Principal
Investigator, Xinlei Wang & Tony Jacobi; TC 8.5, Liquid-to-Refrigerant Heat Exchangers
The objective of this research project will be to: 1) experimentally
determine the fouling resistance on smooth and enhanced tubes using
water representative of cooling tower applications. Experiments should
make use of water having varying levels of fouling potential. In addition to
a baseline test using a smooth tube, fouling tests of at least 5 internally
enhanced tubes shall be conducted. 2) Using the results of the experimental
study, as well as additional data from previous ASHRAE research and other
published works, a model of the fouling resistance shall be confirmed,
modified, or developed. The model shall not preclude application to noncooling
tower applications, such as might occur in enhanced tubes applied
to evaporators. 3) Propose a generalized calculation procedure or approach
to determining an appropriate fouling resistance for a " typical " application
of enhanced tubes in a cooling-tower water heat exchanger application.
Such a procedure should be suitable for publication as part of ASHRAE or
AHRI standards, such as AHRI Guideline E or AHRI Standard 550/590.
A method that represents an improvement in accuracy over the current
method of specifying a specific, constant fouling resistance regardless of
application conditions or enhanced geometry characteristics is desired.
1683-RP Experimental Evaluation of Two-Phase Pressure
Drop and Flow Pattern in U-Bends with Ammonia
April 2020-September 2022; GIK Institute of Engineering and Technology Natural Fluids Refrigeration
Center; Principal Investigator: Ahmad Abbas, Co-PI: Lorenzo Cremaschi
The refrigeration community worldwide depends on ASHRAE to provide
basic information and knowledge for all types of working fluids, including
ammonia. Ammonia is already a preferred refrigerant in commercial food
and beverage applications and many industrial refrigeration applications.
Because ammonia is a natural refrigerant with near-zero GWP, it is currently
being considered for use in many non-traditional commercial refrigeration
and air-conditioning applications. In traditional air-to-refrigerant heat
exchangers, the refrigerant passes through a series of tubes connected
through a U-bend or a return bend. The pressure drop caused by this
U-bend is not properly studied in the case of ammonia as the refrigerant.
Basic research to develop correlations for pressure drop in U-bends with
ammonia is needed. Engineers working to design ammonia evaporators and
condensers will be able to make use of this new information to predict
refrigerant pressure drop more accurately thereby improving equipment
designs for increased efficiency and performance
1696-RP Thermal and Moisture Transport Property Values
for New Building and Insulating Materials
September 2015 - Completed August 2020; Building Science Consulting, Inc.; Principal Investigator,
Christopher J. Schumacher; TC 4.4, Building Materials and Building Envelope Performance
Performance of Internally Enhanced Tubes in
Cooling Tower Applications
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ASHRAE Journal - October 2021

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