snow ice melting design - healthy heating
TRANSCRIPT
Robert Bean, R.E.T.
www.healthyheating.com©Copyright 2004, All Rights Reserved
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
WOW!
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
History Lesson
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Dry
Possible Surface
Conditions
Wet
SlushSnow & Slush
Solid Ice
Solid Ice & Water
Dry Snow
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Theory vs Reality Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Client
Construct
ControlCalcs 4C
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
5W
ClientSnow/Ice Melting Systems
©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Expectations Performance Control
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Heat Container
Construct
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Academic ExerciseCalcs
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
5W
ClientSnow/Ice Melting Systems
©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Client
Who are they?What do they expect?Where do they expect it?When do they expect it?Why do they expect it?
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Client
ResidentialCommercialInstitutionalIndustrialAgricultural
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Time
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and
Ok lahoma State Univ ers i ty .
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Time
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and
Ok lahoma State Univ ers i ty .
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Time
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and
Ok lahoma State Univ ers i ty .
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Ar = 1.0 Ar = 0.0
No
insu
latio
n
Loads are Location and System SpecificTransient Loads vs Steady State Loads
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Sometimes Transient Conditions Help Rather Than Hinder Steady State Loads – “Prewarm” of Slab Surface
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Spacing
StripingStormDepthTempsInsulation
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Back Losses with or without insulationTransient Loads, Btu/hr ● ft2
No
insu
latio
n
Ar = 1.0 Ar = 0.0
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Client
Establish Expectations
Uponor Wirsbo, Wirs bo Snow & Ic e M el ting Design M anual , Copy right 2003, Al l Rights Res erved
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Expectations Performance Control
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Controls
ClimateConsumptionBtu ReleaseProductionBtu Generate
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Controls
ManageExpectationsPerformance
RPA Guide l ines for the Des ign And Insta lla tion o f Radiant Panel Heating and Snow/Ice Mel t Sys tems (2004 Edition). Al l Rights Reserved.
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
1 80
M TWTFS S
1 80
M TWTF SS
LWCO
ODS
GSS
GRS
PTS
PSS
LLS
MASTER CONTROL
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Heat Container
Construct
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
On Grade Btu ContainerWithout a lidControlling and Directing HeatHeat Transfer PrincipalsReducing Parasitic Losses
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
Sub gradeMoistureInsulationStructureSurface
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
Sub gradeExcavationUndisturbedCompactedDrainage
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
MoistureWater TableRun OffMelted SnowSplash
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
Insulation
Uponor Wirsbo, Wirs bo Snow & Ic e M el ting Design M anual , Copy right 2003, Al l Rights Res erved
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
Structure
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
StructureTube
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Construct
Surface
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Academic ExerciseCalcs
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Melting SnowReleases Btu’sHow?Upward LossDownward Loss
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
SoftwareWeatherConstructionExpectationsControls
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and Ok lahom a State Univers i ty .
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
SoftwareWeatherConstructionExpectationsControls
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and Ok lahom a State Univers i ty .
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
IdleOn
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Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Fluid Temp
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Radiant LossCloud Cover
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Back Losses
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Idle OnIdle
Uponor Wirsbo, Wirs bo Snow & Ic e M el ting Design M anual , Copy right 2003, Al l Rights Res erved
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Wind
Uponor Wirsbo, Wirs bo Snow & Ic e M el ting Design M anual , Copy right 2003, Al l Rights Res erved
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
Snow Density
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Outdoor Temperature, °F.
Wei
ght (
lbs/
ft3 )
0 8 10 12 14 16 18 20 22 24 26 28 30 32 342 4 60
7
6
4
3
5
8
1
10
2
9
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Calcs
One Example2” Depth8” Spacing130ºF avg.
American Iron and Steel Institut e
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and
Ok lahoma State Univ ers i ty .
Mass
Height
Free Area Ratio
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Copy right 2004, Am eric an Soc iety o f Heating, Refrigerating and Ai r-Condi tion ing Engineers , Inc . and
Ok lahoma State Univ ers i ty .
TemperatureFlux
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Applications Other Than Snow
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
Phot o & Graphics Credits
Uponor Wirsbo, s lides 14, 21, 32, 33
ASHRAE Transient Snow-melting Analysis Software, s lides 1, 11, 12, 13, 26, 27, 36, 37
Copyright Acknowledgem ents
Slides 1, 11, 12, 13, 26, 27, 36, 37, Copyright 2004, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. and Oklahoma Sta te University. (www.ashrae.org). Reprinted by permission from ASHRAE. All rights reserved
AIS I, s lides 2, 9, 15 , 18, 22, 23, 24, 28, 35
Authors library, s lides 3, 19, 20, 25, 29, 30, 31, 38
Slide 16, RPA Guidelines for the Design And Installation o f Radiant Panel Heating and Snow/Ice Melt Systems (2004 Edition). All Rights Reserved.
Slides 14, 21, 32, 33, Uponor Wirsbo, Wirsbo Snow & Ice Mel ting Design Manual, Copyright 2003, All Rights Reserved
Radiant Panel Association, s lide 16
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
References (chr onologic al order)
Snow Melting, Adam, Napier, T, 1950
Heat Requirements of Snow Melting Systems, Chapman, W.P ., Katunich, S. , 1956
Snow Melting Calculation and Installation Guide , S-40 for Residences, Hydronics Institute, 1991
Design of Embedded Snow Melting Systems Part 1 & 2, ASHRAE Transactions, 1994
Updating the Tables of Design Weather Conditions in the ASHRAE Handbook –Fundamentals, ASHRAE 890-RP, 1998
Development of Snow Melting Load Design Algorithms Volume I , ASHRAE 926-RP, 1999
Updated Design Guidelines for Snow Melting Systems, ASHRAE Transaction CH-99-17-2, 1999
Transient Analysis of Snow-Melting System Performance, ASHRAE Transactions 4591 (RP-1090), 1999Development of a Two Dimensional Transient Model of Snow-Melting Systems, and Use of the Model for Analysis of Design Alternatives, ASHRAE 1090-RP, 2001
Wirsbo Snow & Ice Melting Design Manual, 2003
Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed
environmental ergonomics
building comfort quality into your indoor environment.
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