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Content
ProgramsJanuary Meeting
Topic: Combined Desiccant-Evaporator Cycle Providing Lower Dew Points and Enhanced Dehumidification Presenter: Charlie Cromer Date: Thursday January 5th, 2006 Time: 4:00 Board Meeting 6:00 to 6:45 Social Period 6:45 Dinner Begins 7:00 Presentation Location: DubsdreadControl of humidity in spaces is especially important in Florida’s hot and humid climate where the latent load can easily be as much as 50% of the AC load. This presentation discusses a new application that combines a desiccant and a standard Carnot cycle air conditioning unit. The use of the desiccant provides the AC unit with enhanced moisture removal and a control mechanism whereby the moisture removal of the evaporator coil can be adjusted on the fly down to SHRs below 50% with little to no reduction in energy use. A 3 ton commercial rooftop system incorporating this technology, was shipped to an ARI certified test lab, Intertek, at Cortland, N.Y. for testing in July,2003. The independent tests of the unit showed a 40% increase in moisture removal over the standard equipment at 50% RH return and a 100% increase at 40% RH return with practically no increase (less than 2%) in unit energy use including fan power. The presentation will discuss how this cycle works from a thermodynamic and psychrometric perspective. Charlie CromerCharlie Cromer is the Director of the PV and Distributed Generation Division at the Florida Solar Energy Center in Cocoa Florida. He holds a bachelors in Business Law from the University of Florida, and a MBA from Rollins College. He has a Bachelor in Engineering from the University of Florida, and a Masters and PhD in engineering from UCF. He is a registered PE in Florida and has received nine energy and HVAC related patents with two in process. In ASHRAE, he has been chairman of TC 6.7, Solar Energy Utilization, and chief author of two Handbook Chapters, Chapter 33 in the Equipment Volume and Chapter 33 in the Applications Volume (both on solar). He has served and contributed to many ASHRAE standards and was lead scribe of ANSI/ASHRAE Standard 125, MOT Thermal Energy Meters, and is lead scribe of a Standard in process, 174 – MOT for Rating Packaged Desiccant-Based, Dehumidifier Systems. We hope to have another great turnout for our January meeting. Be sure to register online, or pre pay with Pay-Pal. Hope to see everyone at the meeting. Please register by the end of the day on Tuesday, January 3rd, 2005. Don’t miss out on this great event!
By: Tim Citek President Elect & Programs Chair President's MessageThanks to all of you who either displayed or attended the ASHRAE/ASPE Tradeshow in December. We had strong vendor support for this event and generated nearly $10,000. This money has been earmarked to support our student chapter at UCF. One use of this money will be to send the UCF Student Chapter Officers to the ASHRAE Winter Meeting and AHR exposition in Chicago later this month. The Winter Meeting and AHR Expo will take place from January 21st to 25th this year. If you’ve never been to the Expo you should try and see this one. It will be the largest AHR Expo ever held. Last year we in Orlando we’re fortunate to host this incredible event. With the great work that Bill Dillard did with that Expo I think that our chances our great to get one in the future! Our meeting this Thursday, January 5th will be the deadline to submit your entry for the E-Week Awards program. Click on this link to open the application. Please read the application carefully and make sure that your entry is complete. Incomplete entries will not be considered. Please present your entry to me prior to the meeting. The available award categories are: 1. Engineering Career Achievement Award 2. Engineer of the Year 3. Young Engineer of the Year 4. Outstanding Organization of the Year - Public Sector 5. Outstanding Organization of the Year - Private Sector (Less than or equal to 50 Employees) 6. Outstanding Organization of the Year - Private Sector (More than 50 Employees) 7. Engineering Project of the YearRemember that if your entry is nominated for an award you must attend the banquet. Winners will be announced at the banquet. On a sadder note I have some bad news to share with you. Many of you know Joey Robinson, Past President of the Jacksonville Chapter. His family suffered a terrible loss this past week. On Christmas day his Father-in-Law was killed and two of his children critically injured when the vehicle they were riding in was struck head on by a drunk driver. For more information go to: http://www.news4jax.com/news/5661660/detail.html. We will have a special collection jar set up at the registration table at this Thursday’s meeting to try and offset some of the expenses his family is suffering as a result of this senseless tragedy. Please try and make it to our meeting this Thursday.
By: Todd Moore, P.E. President
Carbon Dioxide in Comfort Cooling-Part 2For part 2 of this series, two main components of the cycle are studied, the evaporator and the compressor. Recalling, the goal of these studies is to determine the entropy generated (lost work) of the components with environmentally friendly CO2 and typical halocarbon refrigerants to examine feasibility of a better industry cooling solution. Focusing on the evaporator, the goal was to determine which refrigerant will generate more entropy. An entropy balance was performed on the refrigerant to air heat exchanger and was further expressed in terms of its thermodynamic properties. Under the same cooling capacity, the equations and experiments resulted in a halocarbon refrigerant volumetric flow rate 5 times that of CO2. Since the entropy generation is proportional to the mass flow rate times the entropy change, the halocarbon refrigerants generate greater amounts of entropy then CO2 in the evaporators. Next, is investigation of the compressor. Based on research and derivation, it was found that the isentropic efficiency of a compressor is a function of its compression ratio. If the compression ratio increases, the efficiency decreases. Being that CO2 has a lower compression ratio than halocarbon refrigerants, they have a higher isentropic efficiency. However, isentropic efficiency is only one component of the total entropy generation. Mass flow, temperature and pressure are also main factors. When looking at all contributes and experimental results, it was found that the CO2 compressors generated 27% more entropy (hence more lost work) than the halocarbon refrigerants. The next part of the series will focus on the expansion device and heat exchanger. The total system will then be analyzed to determine the final results and most optimized system.
Greg Romanczyk CTTC Co Chair Joey RobinsonMany of you know Joey Robinson, past president of the
Jacksonville Chapter. Joey's children and in-laws were involved in a
terrible car accident on Christmas Day. While traveling to dinner a drunk
driver struck the car carrying the children and Joey's in-laws. Joey's
father-in-law was killed. The two youngest children were airlifted to Shands
Medical Center in Jacksonville in critical, but stable condition. Eric T. JenisonASHRAE and Region 12 is proud that , Eric T. Jenison, an ASHRAE member, and one of our past R-12 chapter Presidents , was elected and installed as the NEBB President !!!
Eric is/was very active in ASHRAE
here in Southeast Florida. He also won the ASHRAE William J. Collins
Award.
I hope we will see him in Chicago,
so please congratulate "one of our own" as he progresses thru
his career,,,,,
Thanks,
Ross D. Montgomery, P.E. South American ChaptersDear ASHRAE members,
Would you please mail to me, if you
can part with any of your old ASHRAE Handbooks or CD-roms
(Handbooks) ??
I want to take them down to our
South American chapters in Argentina, Brasil and Peru in the coming
months.
We appreciate anything you can
send.
Please use my address below.
Thanks,
Ross
Ross D. Montgomery,P.E. DDC, Integration, IAQ and Building Control Solutions 6502 28th Ave E. Palmetto, Fla. 34221 ) 941 729 4496 Ê 941 722 6895 * |
