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  1. First - upto 30% loss in cooling capacity due to...

    First - upto 30% loss in cooling capacity due to duct in attic is Typical.
    ____ Attic space could be 130'F and duct supply air near 55'F. 75'F across the duct wall.

    Second - TAB performed by...
  2. manual j input

    POST # 26
    MANUAL J INTRO
    The majority of calcs are performed based on drawings.

    Only 19 pieces of information are needed for a BLOCK LOAD
    which can be either one floor or the Whole House.
    ...
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    $0. _ _ /Kw-Hr $1. _ _ / therm Natural Gas $_._...

    $0. _ _ /Kw-Hr
    $1. _ _ / therm Natural Gas
    $_._ _ / Liquid Propane
    $_._ _ / # 2 Fuel [ oil ]

    ZIP _ _ _ _ _ // Year Built _ _ _ _

    FULL DESCRIPTION of Your Residence is Necessary to...
  4. ENERGY = ENTHALPY DIFFERENCE of the applicable...

    ENERGY = ENTHALPY DIFFERENCE of the applicable Refrigerant * the Refrigerant Flow Rate.

    http://hvacrknowlagecenter.homestead.com/PH_Chart.pdf
  5. HEAT GAIN & LOSS ESTIMATE for OK

    NET EXTERIOR Areas and associated R-values are the factors needed
    to determine Heat Transfer

    No windows.

    WALLS
    NORTH, SOUTH, WEST - N/A

    EAST: 60 * 12 = 720 SQ FEET with R-13
    ____ Door...
  6. How does an EXISTING, Common mini-split A/C...

    How does an EXISTING, Common mini-split A/C system
    on LOW air flow rate
    differ from what you have described?

    Re-Heat function … just add a ' fireplace '
    __ _ _ _...
  7. Energy Cost Estimating

    Operating cost$ is dependent on Time-Weighted Average C.O.P. for applicable equipment
    in Your LOCALE,
    not the advertised HSPF for Climate Zone 4.

    Time weighted average C.O.P. can be...
  8. +/- RANGE

    ACURITE
    … MIGHT BE
    …………….. Humidity Accuracy: +/- 3% RH

    … for 'a Few' Years
    … might be appropriate to obtain a hygrometer every 3 to 4 years.

    ...
  9. PSYCHROMETRICS 101

    TWO-Ton 2-stage for A/C
    + Additional heating Capacity AT < 15'F
    ___ is necessary when selecting a 2-Ton

    ... APPEARS to be ~ 4 x OVERSIZED in A/C Mode


    ___ ___ ___ ___ THE T-STAT SETPOINT...
  10. It is Very Easy to CREATE THE PROBLEM by having a...

    It is Very Easy to CREATE THE PROBLEM by having a setpoint < 73'F.

    At 66'F Return Air ( Room Air), the Supply Air (S.A.) will need to be ~ 46'F to achieve < 52% R.H. consistently.

    I would not...
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    ' Semi - Free ' Cooling

    … Quite GENERAL Criteria for Opening Windows _ _ _ < 63'F Dew Point Outdoors
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    I expected to see a LEGEND or the detailed MODEL...

    I expected to see a LEGEND or the detailed MODEL nomenclature in the Attached Document - see Link.
    This TRANE TEM6 series document lacks this information.

    Performance data is provided.
    ...
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    LOCATION: ZIP _ _ _ _ _ /// presume U.S. of A. ...

    LOCATION: ZIP _ _ _ _ _ /// presume U.S. of A.


    COULD be ... 27'N or 72'N ___ 72' W or 127'W
    __________ 120' or 12000' Elevation

    AGE: 1998 or 1898 Built

    Any Windows ?
  14. INPUT VARIABLES - VERIFY

    3-Ton is likely adequate Given a 3/4-Ton Mini-Split in the Master Suite.

    Each BUILDING THERMAL ENVELOPE input value ( in the shaded Cells) needs to Verified.

    ____ Shaded items on
    _ _ _ LINES...
  15. LOCATION: ______, VA … ZIP _ _ _ _ _ < NEEDED...

    LOCATION: ______, VA … ZIP _ _ _ _ _ < NEEDED for Design Temperatures, HDD & CDD

    Leaning towards Option # 3 .. with XR17 or similar for 2 -stages

    VIRGINIA ranges _ Heating Degrees Days HDD >...
  16. MOVING equipment & ducts to Attic may Increase...

    MOVING equipment & ducts to Attic may Increase heat gains 15% to 35%.

    Attic temperatures may be 20'F to ~40'F higher the outdoor temperature in MID PM.
    __"_ ___ _ " _ _____" _ " upto ~60'F...
  17. INITIAL THOUGHTS

    1987 Built _1800 SF __ LA
    Rule-of-Thumb ( or Dumb) --- +/- 21%
    _____ ~ 640+ SF/ Ton __ 1987 GOOD Construction of Building Thermal Envelope

    HIGHLY DEPENDENT ON AGE … 400 SF/ TON ORIGIN ~...
  18. Do you have spray foam insulation on the Attic...

    Do you have spray foam insulation on the Attic rafters/ Roof underside ?
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    INITIAL THOUGHTS

    SEND ME details of your residence and I can get you started.
    It is not complicated in concept.
    However, it requires a LOT OF DETAILS [ TIME ] to develop an Accurate calculation Model.
    My GMAIL...
  20. Thread: Install cost

    by dan sw fl
    Replies
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    u may expect to pay a Raesaonbale Service fee...

    u may expect to pay a Raesaonbale Service fee
    WITHOUT ANY WARRANTY NOR GUARANTEE.
  21. Thread: Blower speed

    by dan sw fl
    Replies
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    You must be at 11,444 foot elevation.

    You must be at 11,444 foot elevation.
  22. 3,150 SQ FT __ NE Ohio ___ ZIP _ _ _ _ _ Design...

    3,150 SQ FT __ NE Ohio ___ ZIP _ _ _ _ _ Design Temperatures & HDD / CDD
    ___________________________________ 88'F / 4'F _________ 5,600 / 700 ?

    Built in 2006 or 1956 ?

    4-Ton IF < ~ 20 Years...
  23. INITIAL THOUGHTS & CONCEPTS

    Specific Equipment Selection needs to determine
    number of stages and heat pump size.

    Operating cost ($0.089 / kw-hr) may be ~ $ 900 for
    3-ton Heat pump, 2 stage, 17 SEER
    with 4,600 Heat...
  24. 2644 SF Ranch with Basement KY ZIP _ _ _ _ _...

    2644 SF Ranch with Basement
    KY
    ZIP _ _ _ _ _
    $0.1_ _ / kw-hr ?

    Glass Area - SqFt
    North
    S
    E
    West
  25. WHY 60% R.H. at ~ 75'F? 2.5 Ton - 1,600 SF ...

    WHY 60% R.H. at ~ 75'F?

    2.5 Ton - 1,600 SF - Central Florida
    Return DB - Room Air - 76'F
    Return WB _________- ... 'F ?
    ___ ... Wet Bulb ~ 66.2'F

    Supply Air DB ... 'F ?

    Total...
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    https://www.eia.gov/dnav/ng/ng_pri_sum_dcu_SNY_m.h...

    https://www.eia.gov/dnav/ng/ng_pri_sum_dcu_SNY_m.htm
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    I DON'T SPECIFICALLY KNOW IF YOUR COSTS GO WAY...

    I DON'T SPECIFICALLY KNOW
    IF YOUR COSTS GO WAY UP EITHER.

    What is your current cost?

    You use how many therms per month for the last 24 months?

    Oil?

    Natural Gas?
  28. Replies
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    HEAT LOSS might be in THE _BALL PARK of 64,000...

    HEAT LOSS might be in THE _BALL PARK of 64,000 BTU/HR at 15'F

    Your Heat Loss approximation from link
    ___ THANKS to GARY.

    ___ Attachment

    ___ www.loadcalc.net

    ___ ___ ___ LOAD CALC 2200...
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    A LOT OF JUICE ... N E C E S S A R Y

    ___ THINK HARD..!...!!
    about building YOUR Own POWER PLANT.
    __________________________ ~70K dollars for maybe 20 KW SOLAR PV
  30. Location _ _ _ _ _ 210 HOURS...

    Location _ _ _ _ _

    210 HOURS operating in June MUST BE CLOSE TO 40.3'N Latitude

    Mexico City
    ___ Thunder Bay Given a 1,450 SQ FT BERM Home + 100,000 BTUH Furnace
    _______ OR...
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    3 STRIKES AGAINST YOU RIGHT AT THE START. # 4...

    3 STRIKES AGAINST YOU RIGHT AT THE START.

    # 4
    How could the proposed solution of increasing the delivered air temperature at a reduced air flow rate
    possibly improve the AIR BALANCE situation? ...
  32. BUILDING THERMAL ENVELOPE Description

    You have Solar PV panels ? ___ System Size __ kW

    You seem to be heavily dependent on the local utility rate. WHY?

    ---
    Are the windows NEW double or triple pane?
    The modeling seems to be OLD...
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    You may be able to take advantage of a perceived...

    You may be able to take advantage of a perceived short term cost LOOPHOLE ?

    The future maintenance needs may present a different perspective
    where that loophole
    seem$ to be more of a...
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    If you need a proposal for HVAC design services, ...

    If you need a proposal for HVAC design services,
    my gmail address is racingdan11.

    Window and interior shading schedule /specs, Ceiling, Floor & Wall R-values, infiltration rate and drawings are...
  35. Replies
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    I ABSOLUTELY DID NOT SUGGEST ONE A/C SYSTEM. ...

    I ABSOLUTELY DID NOT SUGGEST ONE A/C SYSTEM.

    … will likely only require a total A/C capacity of < 4 tons.
    … DOES NOT mention any specific amount or type of equipment.

    LUTRON shades needed...
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    3,065 SQ FEET with spray foam and SUPERIOR...

    3,065 SQ FEET with spray foam and SUPERIOR WINDOWS [ SHGC < 0.22]
    with your significant overhangs [ shading ]
    will likely only require a total A/C capacity of < 4 tons.

    I did not notice a North...
  37. HVAC + THERMAL BUILDING ENVELOPE SYSTEM DEFINITION ...

    0lder = 1895 or 1995 … IMO
    _______________ 3,800 Sq Feet

    North, CENTRAL N.C. - predominant Heating environment
    3,500 Heating Degree Days
    1,900 Cooling Degree Days

    You wish to replace the...
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    ... LOCATION LOCATION LOCATION LOCATION ...

    Location: ___

    2,800 Sq.Ft., 2-story __ Built in 1957 or 2007?

    320 Sq feet of Windows ?
    SHGC 0.2, 0.4 or 0.6
    U-factor 0.3, 0.4, 0.5 ?

    % R.H. ___ ?
  39. MAIN heat source will be a heat pump (or furnace)...

    MAIN heat source will be a heat pump (or furnace) except for the seven Most Southern FL counties per Section 403 Systems

    Use of Back-up is governed by
    "
    R403.1.3 Heat pump supplementary heat...
  40. STRAIGHT ELECTRIC Heating violates the Florida...

    STRAIGHT ELECTRIC Heating violates the Florida Building Code, Section EC
    in nearly all Florida counties.
    ...
  41. I Guess WHATEVER 1. the Ductz STUFF THAT WAS...

    I Guess WHATEVER
    1. the Ductz STUFF THAT WAS SPRAYED
    2. or carpet cleaning agents
    3. your place is TOOO COLD AND TOOO DRY
    4. or …
    ______ maybe possible root causes.

    WHY would the fan be set...
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    TRANE / AMERICAN STANDARD is made in TYLER TX ...

    TRANE / AMERICAN STANDARD
    is made in TYLER TX

    Why do you need a furnace.?
    ____ Is residence located North or South of 37'N Latitude?
    ____ Heating Degree Days
    ------ ________________ <...
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    Services 1,450 + ~ 750 = 2,200 Sq Feet.? 26'N...

    Services 1,450 + ~ 750 = 2,200 Sq Feet.?

    26'N or 52'N Latitude?

    800 or 8,000 Feet Elevation

    House Built in 1895 or 1995?
    Any THERMAL BUILDING ENVELOPE enhancements since original...
  44. Also the system as noted is designed to run a lot...

    Also the system as noted is designed to run a lot
    or all the time
    IF sized properly.
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    RA Temp ?

    " … Most seemed well however we still had problems hitting 74 degrees in the house.
    The system could pretty easily hit 75 but struggled to hit 74. "

    The statement above is Not consistent with RA...
  46. 10" [ 8" ] INSIDE Diameter Duct ought to be...

    10" [ 8" ] INSIDE Diameter Duct ought to be adequate for a ~ 20' X 20'+ [ 15' X 18'+ ] ROOM
    unless there is HUGE AMOUNT OF GLASS
    OR you are trying to cool to < 74'F.

    What are the Supply Air...
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    SO, you are now normally running on Stage 1 [ Low...

    SO, you are now normally running on Stage 1 [ Low ]
    when it is < ~85'F outside.?..??

    ODT at time of commissioning?

    What were the measured
    total air flow rate,
    return air temperature
    and...
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    The duct sizing calculation methodology is known...

    The duct sizing calculation methodology is known as ACCA MANUAL D.

    The summary of MINOR LOSS coefficients results in a TEL that will provide a
    reasonable required friction loss
    IF ALL...
  49. 300 FPS = 18,000 FPM is quite FAST NOISE will...

    300 FPS = 18,000 FPM is quite FAST

    NOISE will be VERY HIGH @ 18,000 FPM.


    Do you happen to be a Pilot?
  50. older = ? 1975 or 1998 Single or Double Pane...

    older = ? 1975 or 1998

    Single or Double Pane windows
    ?? 250 Sq Feet Total // ~ 16 windows
    Most Facing N, S, E or West
    … ie. … ... 3, 3, _ 5, 5

    ZIP _ _ _ _ _
    ____ You do not need a gas...
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