Luis Hernandez
  • Rhinebeck, NY
  • United States
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Luis Hernandez's Groups

Luis Hernandez's Discussions

Solar Heat Air
11 Replies

Does anyone has and quantifiable data for a solar heat air system?  It seems the state of Minnesota has been investing into this technology but I have not yet found any good data I could use…Continue

Tags: heat, solar, heating, Passive

Started this discussion. Last reply by Bradley Wiesneth Jul 17.

Concrete floor insulation details
2 Replies

Greetings everyone!    I was hoping I could get some feedback with a building I am working on. The existing concrete was a 3 inch "homeowner special", so the plan is to set 2 inches of rigid foam,…Continue

Tags: radiant, heat, installation, board, foam

Started this discussion. Last reply by Hal Skinner Jun 24.

Air Source Heat pump or mini-split efficiency
1 Reply

Greetings everyone!    I have a technical questions I hope I could get some feedback! I understood that air source heat pumps are very efficient because of their ductless configuration. I have been…Continue

Tags: efficiency, duct, ductless, minisplits, pump

Started this discussion. Last reply by George J. Nesbitt Apr 30.

Open cell foam and cellulose... Can they work together?
11 Replies

Greetings everyone!   I have a client who would like to have two inches of open cell foam in the attic flat, and then 10 inches of cellulose. Someone mentioned to you that there were issues in doing…Continue

Tags: foam, cell, open

Started this discussion. Last reply by Richard Beyer Mar 29.

 

Luis Hernandez's Page

Latest Activity

Luis Hernandez added a discussion to the group TREAT Software
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Basic Heat loss information

Greetings everyone,     I was told that I could get very basic heating loss calculations from TREAT. Besides the amount of fuel usage I cannot find where this basic heating calculation is in TREAT which I am certain it is staring at me right at the face! Could anyone be kind and point it out to me?Thanks,     LuisSee More
Oct 16
Luis Hernandez replied to Luis Hernandez's discussion How to model a skylight in the group TREAT Software
"Ethan, that is pretty clever! Thanks, your answer worked perfectly... "
Oct 16
Ethan MacCormick replied to Luis Hernandez's discussion Modeling the apartment upstairs in the group TREAT Software
"Boy, Luis, sorry to see this so late. Curious what you did.  Our general approach would be to model only the surfaces in the apartment  that are adjacent to unconditioned space, so leaving off floors and walls that are adjacent to the…"
Sep 26
Ethan MacCormick replied to Luis Hernandez's discussion How to model a skylight in the group TREAT Software
"Hi Luis, I'm not sure what the NYSERDA specifics would be, but in basic terms, a skylight is just a window in a sloped roof (typically).  So picking the right frame and glazing characteristics and putting it into a sloped roof should do…"
Sep 26
Luis Hernandez added a discussion to the group TREAT Software
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How to model a skylight

Skylights have different criteria than windows under NYSERDA protocols, so I am trying to figured out how to model a skylight!!! Any help would be greatly appreciated, thanksLuisSee More
Sep 25
Bradley Wiesneth replied to Luis Hernandez's discussion Solar Heat Air
"Luis,    I agree with Jed.  Get a hold of RREAL in Minnesota.  We installed a solar furnace/collector on a client's home in Illinois with their help.  They were able to give us a BTU rating for the size collector that…"
Jul 17
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"Under the average floor for a home with a crawl space is air you don't want inside the home as well as most attic air.This method puts in pipes for thermal-mass and provides good aeration in the joist space then seals it from the crawl space…"
Jul 12
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"The key is the attention to the details,  you really have to seal any "roof" ducting.  It can't be leaky where it would allow air elsewhere from the attic or under the eaves to be pulled in -- unless it is filtered before…"
Jul 12
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"I was being specific, using the roof is for where nothin"
Jul 12
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"There are a several of issues with using the roof as solar collector.  If carefully engineered it could work,  done wrong and your house and pocket book will forever suffer. First,  is heat, roofs and attics do indeed get very hot.…"
Jul 11
Tom Mallard replied to Luis Hernandez's discussion Solar Heat Air
"Consider using sections of roof for the main thermal collection where it's not practical to add a greenhouse or other collection system, use a data logger in the attic close to the peak between rafters to know daily temperature curves to know…"
Jul 10
Mick Dunn replied to Luis Hernandez's discussion Solar Heat Air
"Luis: My company specializes in large scale solar air heating systems, and solar air heating in general. We don't do much with small modular glazed collectors (although we've installed about 40 of them), but we did just install a…"
Jul 8
Luis Hernandez's 2 discussions were featured
Jul 7
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"For raw data about solar insolation: https://www.eol.ucar.edu/projects/hydrometnet/minnesota/minnesota.html See the various NOAA and weather station summaries.  The major MN universities are also likely to have data for solar heating…"
Jul 3
Dennis Heidner replied to Luis Hernandez's discussion Solar Heat Air
"There is a great deal of data, engineering, white papers, and published work on solar air heating.  It can work, but you need a structure designed to use it.  That means a structure that is air tight and well insulated so that the losses…"
Jul 3
Tom Delconte replied to Luis Hernandez's discussion Solar Heat Air
"L: DOE: Solar Heat non-DOE: BUILD SOLAR in either case, there is virtually no quantifiable or verifiable data on solar, just some people who say they can make it work without backup heating! T "
Jun 26

Profile Information

Company
Gaia Sharbel Energy Contracting
Professional Certification
BPI AP, BPI EP, cSBA, IEEE
Professional Interests
Solar passive, sustainable, renewable energy solutions, Energy Star, Energy Audits
Website URL
http://www.loweryourenergynow.com
LinkedIn Profile
www.linkedin.com/pub/luis-hernandez/6/859/9b0/

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At 3:21pm on August 15, 2013, Diane Chojnowski said…

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