refrigerant inventory calculation
TRANSCRIPT
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Refrigerant Inventory Calculation
Daniel DettmersAssociate Researcher
IRC
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Refrigerant Inventory Determination
What is the quantity of refrigerant in your system?
Vessels, piping, evaporators, condensers, compressors (oil separators), traps, etc.
How does that inventory change over time?Do I care? ?
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Refrigerant Inventory Determination
Required for ALL ammonia refrigeration systems
OSHA ComplianceTo establish whether or not it is a covered processAs part of Process Safety Information for covered processes
EPA ComplianceChemical Inventory ReportingOff-site consequence analyses
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Where is the best place to look for ammonia?
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Places to look for ammonia:
Cold liquid:low temperature recirculators (vessels)pumped liquid linesflooded evaporators (chillers and air-cooling evaporators – including surge drums)
Warm liquid:high-pressure receiverscontrolled pressure receiverscondensers, thermosiphon pilots, oil coolers
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Places to look for ammonia:
Two-phase:wet returnstransfer stationsevaporators – including DX & overfed evaps
Vapor?
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Next, Calculate Inventory
φθ
φ
⋅−=
⎟⎟⎠
⎞⎜⎜⎝
⎛ −=
21802
2sinD
HD
D/2H
θ
φ
( ) ( )36042 θπ ⋅= DApie
( ) ( ) ( )
tripiesectioncross
tri
AAA
HDHDDA
⋅−=
−⋅⎟⎠⎞⎜
⎝⎛ −−⋅=
− 2
22221 22
satsatsat
estpiperef
TdTT
ddM
⋅⋅−⋅−⋅+
⋅+⋅−=
16767.00002111.02142.0
0282.23353.3441.42
2,,
phasetworefpipepipephasetworef VM −− ⋅= ,,, ρ
⎟⎟⎠
⎞⎜⎜⎝
⎛−+=
− liquidvaporliquidphasetworef
xρρρρ
1111
,
( )insatrefoutletphasetworefref C ,,,, ρρρ +⋅= −
outletphasetworefoutletphasetworef v ,,
,,1
−− =ρ
refinternalevapevapref VM ρ⋅= ,,
( )inletliquidinletvaporinletliquidinletref
vvfv ,,,,
1−+=
ρ
( )( )evapliquidevapvapor
evapliquidpressurehigh
hhhh
f,,
,
−
−= −
[ ]mmBh
lbmmBhCapacityM mnominalcondenserref 90, ⋅≈
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Or, Use IRC’s Tools
Downloadable at:
http://www.irc.wisc.edu
Under “Software Tools”
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Alternatively, the IRC’s Charge Management Tool
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Charge Management Tool
Estimates refrigerant inventory in:Piping
Vessels: horizontal and vertical
Evaporators
Condensers
Compressors
Generates output formsForms can be Word files, HTML, or email attachments
Calculations grouped by equipment, location, or charge
2
4vessel
partialdV Hπ= ⋅
dvessel
L
Hliquid
2
4vessel
totaldV Lπ= ⋅
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Infrastructure
Ammonia properties determined by EESTool is composed of four sections
Location & PreferencesInput CalculationsOutput FormsLoad & Save
Tool is accessible to IRC members under “Software Tools” on website
www.irc.wisc.edu
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Starting a new session…Location & Preferences
Input Calculations
Output Forms
Load & Save
Location & Preferences
Input Calculations
Output Forms
Load & SaveEach equipment piece can be organized into areas.Each equipment piece can be organized into areas.
To begin, click this arrowTo begin, click this arrow
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Input Calculations
Unassigned is a default area for all equipment.Unassigned is a default area for all equipment.
To add a charge calculation, select the equipment type from this drop down menu
To add a charge calculation, select the equipment type from this drop down menu
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Adding Equipment
Make sure to provide a thorough description of the equipment piece
Make sure to provide a thorough description of the equipment piece
To run the calculation, click “Calculate Charge”To run the calculation, click “Calculate Charge”
Each input value has an associated unit. Conversions are automatically performed.
Each input value has an associated unit. Conversions are automatically performed.
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Adding Equipment, cont.
To add a new area, click this link.
To add a new area, click this link.
The previous calculation now appears in this table.The previous calculation now appears in this table.
The green check indicates no errors were found. If there is an error, clicking on this icon will reveal any details.
The green check indicates no errors were found. If there is an error, clicking on this icon will reveal any details.
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Adding an Area
The name given here will appear in the area list under Input Calculations, below “Unassigned”
The name given here will appear in the area list under Input Calculations, below “Unassigned”
To continue, click the arrowTo continue, click the arrow
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Adding an Area, cont.To change any preferences, such as unit defaults or location information, click the following menu item.
To change any preferences, such as unit defaults or location information, click the following menu item.
Selecting an equipment type from this menu will add equipment to this area.
Selecting an equipment type from this menu will add equipment to this area.
The new area now appears in the list.The new area now appears in the list.
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Location & Preferences
If you change the elevation, any calculations where you input a gauge pressure will need to be recalculated.
If you change the elevation, any calculations where you input a gauge pressure will need to be recalculated.
To save your changes, click the arrow. Once you have saved your information, click a menu item above to perform additional calculations or generate output forms.
To save your changes, click the arrow. Once you have saved your information, click a menu item above to perform additional calculations or generate output forms.
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Output Forms
When generating an output form, several options are available, such as the form layout, document type, and the ability to send the form as an email attachment. To continue, click the arrow.
When generating an output form, several options are available, such as the form layout, document type, and the ability to send the form as an email attachment. To continue, click the arrow.
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Example Output Form
The total charge and equipment types have been tallied here. Subsequent pages of the form provide details for each area or equipment type (depending on what form layout was selected).
The total charge and equipment types have been tallied here. Subsequent pages of the form provide details for each area or equipment type (depending on what form layout was selected).
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Load & Save
To load an existing session (from your computer), click “Browse” and select it. Click the arrow to continue.
To load an existing session (from your computer), click “Browse” and select it. Click the arrow to continue.
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Example of a Loaded Session
There are three options that can be performed on each equipment piece:
- Delete
- Move to another area
- Make a copy
There are three options that can be performed on each equipment piece:
- Delete
- Move to another area
- Make a copy
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Closing Notes
This is a Beta versionPlease send us any bugs you find
EES (Engineering Equation Solver) is the computational engineEES cannot run simultaneously with itself
Too much traffic can freeze the EES program, preventing further calculationsIf this occurs, save your session and try again later
Contact the IRC with any questions/comments [email protected]