Snow Ice Melting Design - Healthy Heating

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!


History Lesson

Courtesy of American Iron and Steel Institute


Dry

Possible Surface

Conditions

Wet

SlushSnow & Slush

Solid Ice

Solid Ice & Water

Dry Snow


Theory vs Reality Snow/Ice Melting Systems©Copy right 2004, Robert Bean, Al l Rights Res erv ed

Client

Construct

ControlCalcs 4C


5W

ClientSnow/Ice Melting Systems

©Copy right 2004, Robert Bean, Al l Rights Res erv ed

Expectations Performance Control


Heat Container

Construct


Academic ExerciseCalcs


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?


Client

ResidentialCommercialInstitutionalIndustrialAgricultural



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 .


Time




Time






Ar = 1.0 Ar = 0.0

No

insu

latio

n

Loads are Location and System SpecificTransient Loads vs Steady State Loads


Sometimes Transient Conditions Help Rather Than Hinder Steady State Loads – “Prewarm” of Slab Surface


Spacing

StripingStormDepthTempsInsulation


Back Losses with or without insulationTransient Loads, Btu/hr ● ft2

No

insu

latio

n

Ar = 1.0 Ar = 0.0


Client

Establish Expectations

Uponor Wirsbo, Wirs bo Snow & Ic e M el ting Design M anual , Copy right 2003, Al l Rights Res erved


Expectations Performance Control


Controls

ClimateConsumptionBtu ReleaseProductionBtu Generate



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.


1 80

M TWTFS S

1 80

M TWTF SS

LWCO

ODS

GSS

GRS

PTS

PSS

LLS

MASTER CONTROL


Heat Container

Construct



Construct

On Grade Btu ContainerWithout a lidControlling and Directing HeatHeat Transfer PrincipalsReducing Parasitic Losses


Construct

Sub gradeMoistureInsulationStructureSurface



Construct

Sub gradeExcavationUndisturbedCompactedDrainage


Construct

MoistureWater TableRun OffMelted SnowSplash


Construct

Insulation



Construct

Structure



Construct

StructureTube



Construct

Surface



Academic ExerciseCalcs


Calcs

Melting SnowReleases Btu’sHow?Upward LossDownward Loss


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 .


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 .


Calcs

IdleOn



Calcs

Fluid Temp


Calcs

Radiant LossCloud Cover


Calcs

Back Losses


Calcs

Idle OnIdle



Calcs

Wind



Calcs

Snow Density


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


Calcs

One Example2” Depth8” Spacing130ºF avg.

American Iron and Steel Institut e




Mass

Height

Free Area Ratio




TemperatureFlux


Applications Other Than Snow


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


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


environmental ergonomics

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Snow Ice Melting Design - Healthy Heating

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