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  • Users: DrRTU
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  1. DrRTU

    Dehumdification Software Recommendation

    I normally use HAP for my loads but it will not work in this case. I have a space that has a heating load, minimum ventilation load and substantial internal moisture production. I would like to heat the space with direct fired MAU with a minimum 40% outside air. I need to size the MAU fan cfm as...
  2. DrRTU

    Medical Gas Installation N2 Purity

    Installing medical O2 and Vacuum as per NFPA 99 2012 chapter 5. Can we use “industrial grade” N2 for inerting during braze or do we have to use “medical grade”? I believe both specs are listed as oil free.
  3. DrRTU

    Distance Between Exhaust and Intake

    Design as per ASHRAE 2007 (no addenda). If a unitary RTU with gas heating has a barometric relief or power exhaust. RTU is less than 400O CFM. What do you see as the minimum separation of exhaust or flue on RTU and its air intake hood. I have extended the FAIs 10 feet. "Other" designer is...
  4. DrRTU

    Baking Facility

    I am looking for a resource such as a “good practice” guide of room design criteria for a production baking facility in terms of suggested air changes per/hour, temperature, cleanliness and humidity. I have reviewed ANSI/ASB Z50.
  5. DrRTU

    ASHRAE 90.1 definition of ôFossil /Electric Hybridö

    I cannot find an example of a “fossil/electric hybrid” system. When undertaking a 90.1-2004 appendix G simulation, we are required to select a baseline system from table G3.3.1a &b based upon a heating system. I have a building that I believe should be an Electric and Other system 6 (package VAV...
  6. DrRTU

    Heating ASRS Warehouse

    Does anyone have experience with an automated storage retrieval building that is 125’ tall. I am concerned about heating equipment selection. Building will be solid racks with exterior wall panels attached to racking. Roof structure is supported via racking. I cannot install an air rotation...
  7. DrRTU

    90.1 Appendix G and Refrigerated Warehouse.

    In previous LEED EAc1 energy models, I have used receptacle and process loads with the same values for proposed and baseline buildings. This does not easily allow or encourage process energy saving. I am starting work on a model with a refrigerated warehouse. The power consumption of freezer /...
  8. DrRTU

    LEED EAc5.1 & EAc5.2 Software

    What software have you used to simulate the building in the M&V process (option D)? How have you modified the weather files to match the the M&V time frame? I used HAP 4.4 for EAc1 but I don't like the issue of changing the TMY weather data. How have you adjusted the solar gain values?
  9. DrRTU

    Leed EA cr1 plug load

    I am working on a project that requires 5 watts/ft2 for the plug load. When I run the Appendix G simulation, it pops up with 67% misc power. This unregulated load in the baseline and proposed is screwing with the potential saving on the building. Appendix G states I need to have a minimum of...
  10. DrRTU

    LEED Core & Shell EA Credit 1

    What lighting loads have other mechanical designers used for a LEEDs Core and Shell program? I am trying to run my energy model but the electrical lighting loads will screw up the numbers. The core building “future area” has been designed with temporary lighting of 0.02 watts/sq. ft. I have 4...
  11. DrRTU

    LEED-NC 2.2 Credit 7.1 Thermal Comfort Design

    How have designers implemented ASHRAE 55-2004 to achieve compliance? Software or manual calculations?
  12. DrRTU

    Meduim Pressure Ring Header

    I am looking for a paper, article or tips on design of a medium pressure "ring" duct system. The application is a multistory office building. The floor is feed from a central station via a riser. In the past, I have broken the floor plate into sections and determined the max CFM per section then...
  13. DrRTU

    SEER vs EER energy simulation

    I am working on an energy simulation as per 90.1-2004 appendix G for a LEEDS project. I am having issues with SEER vs. ERR of unitary packages less than 65K btu/hr. 90.1 requires a SEER of 12.0 but the modeling software uses EER. Units larger then 65K are tested to a different ARI test standard...
  14. DrRTU

    410a or 407c ACCU selection

    I am in need of a recommendation on a 410a or 407c 12 ½ ton or 25 ton air-cooled condensing unit. Carrier, Trane, York and McQuay do not offer these products yet. Standard comfort CV use with operation down to 40 degrees F.

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