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					Instructions for use of Garage to House Pollutant Transfer Model
                 Created by:
                 Analysis North
    A            11400 Mountain Lake Drive
        N        Anchorage, AK 99516
                 1-907-338-0963
                 Tools for Energy and HVAC Professionals
                 http://www.energytools.com/

If you want to go directly to the Model, click on the "Model Inputs" sheet tab at the bottom of the
screen.

Purpose

The purpose of this model is to show how pollutants transfer from an attached garage
into a home. For example, idling a car in a garage before backing it out can generate high levels
of Carbon Monoxide (CO) in the garage. If the garage is attached to the house and not well sealed
from the house, this carbon monoxide can move into the house. A particularly high rate of transfer
occurs if a forced-air furnace is located in the garage and the furnace has leaky ductwork. The
leaky ductwork picks up pollutant from the garage and carries it into the house.

Use of the Model

One general note: all cells that are colored yellow are inputs to the model and can be changed
by the user. All other cells contain formulae, and should not be altered by the user.

The basic use of the model involves entering values that describe the pollutant release in the garage and
describe the various air flows between the house, garage, and outside. All of these inputs are made on
the "Model Inputs" sheet. Then, the concentrations of pollutant in the garage and house are shown over
time by the graph on the "Results" sheet. The garage concentration is shown with the blue line and is
read off the left vertical axis. The house concentration is shown with purple line and read off the right
vertical axis.

The model can model two different pollutant release situations:
1) A burst of pollutant is released in the garage, elevating the garage pollutant level to a high
concentration, but then no additional pollutant is released.
2) The concentration of pollutant in the garage is approximately constant due to a continual
release of pollutant in the garage.
To model the first situation (burst release) clear the "Hold Garage Concentration Constant"
checkbox. To model the constant concentration situation, check the "Hold Garage Concentration
Constant" checkbox. This checkbox is found in the Garage area of the input diagram.

The other inputs to the model are explained in more detail in the cell notes. A cell note is designated
by a red triangle in the upper right corner of the cell. You can see the note by hovering your mouse
pointer over the cell, if you are using Excel 95 or 97. If you are using Excel 5, you need to select the
cell and then press Shift-F2 (hold the Shift key down while pressing F2).




9/30/2011 12:03 AM                                       348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Instructions
                                                       Page 1
Inputs to Model
Version 2


  25.0 cfm                                         40.0 cfm                          75.0 cfm

  Outside                          Garage                                     House                   Outside
 ppm:       0          Initial ppm:      475                           Initial ppm:    0
                                                                                           3
                        Hold Garage Concentration Constant                Volume: 17,600 ft
                                               3
                          Volume:      4,800 ft

                       15.0 cfm                                       30.0 cfm                         65.0 cfm




Flow Balance Checks . If any of the values below are not 0, flows are not balanced in the indicated
space. Recheck the cfm flow rate inputs and ensure that inflows equal outflows for each space.
House:                 0.00
Garage:                0.00




  9/30/2011 12:03 AM                                           348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Model Inputs
                                                              Page 2
Garage-House Pollutant Transfer Model
Version 2

                500                                                                                   60
                450
                                                                                                      50
                400
                350
                                                                                                      40
   Garage ppm




                                                                                                           House ppm
                300
                250                                                                                   30
                200
                                                                                                      20
                150
                100
                                                                                                      10
                 50
                  0                                                                                   0
                      0          100           200    300        400       500        600       700
                                                     Time, Minutes

                                                     Garage        House

 Time,
 minutes                  Garage       House
                  0            475              0
                  5            448              5
                 10            422             10
                 15            398             15
                 20            376             19
                 25            355             23
                 30            335             26
                 35            317             29
                 40            300             32
                 45            284             34
                 50            268             36
                 55            254             38
                 60            241             40
                 65            228             42
                 70            217             43
                 75            205             44
                 80            195             45
                 85            185             46
                 90            176             47
                 95            167             47
                100            159             48
                105            152             48
                110            145             49
                115            138             49
                120            131             49


9/30/2011 12:03 AM                                            Page 3348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Results
      125        125   49
      130        120   49
      135        114   49
      140        109   49
      145        105   48
      150        100   48
      155         96   48
      160         92   48
      165         88   47
      170         85   47
      175         81   46
      180         78   46
      185         75   45
      190         72   45
      195         69   44
      200         67   44
      205         64   43
      210         62   43
      215         60   42
      220         58   42
      225         56   41
      230         54   40
      235         52   40
      240         50   39
      245         49   39
      250         47   38
      255         45   37
      260         44   37
      265         43   36
      270         41   36
      275         40   35
      280         39   34
      285         38   34
      290         37   33
      295         36   33
      300         35   32
      305         34   32
      310         33   31
      315         32   30
      320         31   30
      325         30   29
      330         29   29
      335         28   28
      340         28   28
      345         27   27
      350         26   27
      355         26   26
      360         25   26
      365         24   25
      370         24   25
      375         23   24
      380         23   24


9/30/2011 12:03 AM          Page 4348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Results
      385            22   23
      390            22   23
      395            21   23
      400            20   22
      405            20   22
      410            20   21
      415            19   21
      420            19   20
      425            18   20
      430            18   20
      435            17   19
      440            17   19
      445            17   19
      450            16   18
      455            16   18
      460            16   17
      465            15   17
      470            15   17
      475            15   16
      480            14   16
      485            14   16
      490            14   15
      495            13   15
      500            13   15
      505            13   15
      510            12   14
      515            12   14
      520            12   14
      525            12   13
      530            11   13
      535            11   13
      540            11   13
      545            11   12
      550            10   12
      555            10   12
      560            10   12
      565            10   11
      570            10   11
      575             9   11
      580             9   11
      585             9   11
      590             9   10
      595             9   10
      600             8   10
      605             8   10
      610             8   10




9/30/2011 12:03 AM             Page 5348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Results
9/30/2011 12:03 AM   Page 6348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Results
Version Notes

Current Version:               2

Version 2:
Implemented a more general model that allows supply and a return flows to an adjoining
space to be unbalanced. Incorporated a diagram for entry of the inputs.




9/30/2011 12:03 AM                                 348d645f-4bdc-4d81-8e5d-eef0978c8dd7.xls Version Notes
                                                   Page 7

				
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