aaaa miracles do not happen
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8 HARDNESS
PENETRATION
60 60 IT IS MECHANICAL PROPERT
TO RESIST PENETRATION
9 HYGOSCOPICIT %
VOLUME
10-15 10-15 ABILITY TO ABSORB AND
RETAIN WATER
10 RESISTANCE TO ACIDS GOOD
EXCEPT
HF
H3PO4
GOOD
EXCEPT
HF
H3PO4
11 RESISTANCE TO CAUSTIC FAIR TOPPOR
FAIR TOPOOR
12 RESISTANCE TO
SOLVANTS
EXCE-
LLENT
EXCELL
-ENT
13 SHRIANKAGE %
LINEAR
LESS THAN
2%AT 350 C
<2%
@ 900C
PROPERTY OF MATERIAL
INDICATING LOSS IN DIMEN
TION WHEN SUBJECTED TO
TEMPERATURE.
14 LEACHABLE CLORIDE <10ppm <10ppm
15 SPECIFIC GRAVITY
REAL
APPARENT
4.16
0.24
200-210
0.48
THE RATIO OF MASS OF SOL
MAKING UP MATERIAL TO
WEIGHT OF EQUAL VOL OF
WATER.THE RATIO OF SPECIFIC WT.
OF MATERIAL INCLUDING VTO EQUAL VOL OF WATER.
16 SPECIFIC HEAT 0.16 W/KG
0.15 W/KG
THIS IS REQUIRED TO KNOWHEAT STORAGE AND TEMP.
TIME LAG.
17 STRENGTH
COMPRESSIVE @5%-DO- @10%
412.17
Kpa600 Kpa
UPTO 25
MM60-80MIN
600 Kpa
>25MM
50-70 MIN
1200Kpa
PROPERTY OF MATERIAL
TO RESIST LOAD TENDINGTO SQUEEZE IT
18 STRENGTH FLEXURAL 262Kpa 241TO300
Kpa
ABILITY TO RESIST BENDING
WITH OUT BREAKING.
19 MODULUS OF RUPTURE 600Kpa
AT 982
DEG C
MIN 400
UPTO
25MM
858Kpa@
MIN 200
ABOVE 25MM
700 DEG
INDICATIVE OF CRUSHING
STRENGTH OF MATERIAL
20 TENSILE STRENGTH VERY LESS HIGH AS
DENSITYINCREASES.
THE PROPERTY OF MATERIA
WHICH MEASURES ITS ABILITO RESIST A STRESS TENDIN
TO PULL IT APART.
21 TEMPERATURE LIMIT
SERVICE
SHORT TIME
CONTINIOUS
650GR
--------
450 C
900 GR
----------
700 C
CALCIUM SILICATES HAVE
A INVERTION TEMP 675
WHERE AS ALUMINA HAS
INVERSION TEMPERATURE
OF 1150 C.
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22 MELTING TEMPERATURE 1425 C 1425 C SILICATES HAVE INCONGUE
MELTING POINT.
23 THERMAL
DIFFSSSIBILITY
M2 /HR AT 38 C. 4.12 X
-7
10
2.58 X
-6
10
THE PROPERTY OF MATERIA
WHICH MEASURES THE TIME
RATE OF TEMPERATURE
MOVEMENT THROUGH IT.IN
CLCLIC OPERATION HIGH T.D
IS REQUIRED .IN FIRE PROOF
SLOW T.D. IS REQUIRED.24 THERMAL SHOCK
RESISTANCEEXCE--LLENT
EXCE--LLENT
ABILITY TO WITHSTANDRAPID CHANGE OF TEMP.
25 VIBRATION
RESISTANCE
FAIR
FAIR
GOOD ABILITY TO WITHSTAND
VIBRATIONS.
26 WATER ABSORPTION
% BY VOLUME
90 80
27 WATER VAPOUR
TRANSMISSIONPERM-CM
VERY
HIGHVERY
HIGH
NOT VERY
HIGH
RATE OF WATER VAPOUR
PENETRATION DUE TOPRESSURE DIFFERENCE.
28 THERMAL
CONDUCTIVITY W/M K DEG C.
MEAN TEMP Density 192kg/m3 Density 320kg/m3
93 0.052 0.052
149 0.061 0.00.076
260 0.091 0.0.092
370 0.110
480 0.128
29 SIZES
THICKNESS AVAILABLE
762x 1117 x 10 1000 X 500 X 25 STANDARD TOLERANCE
SHALL APPLY
30 LINEAR SHRINKAGE 2%AT
650 C
2% AT
900 C
31 CHEMICAL ANALYSIS
32 PRICES: RS 180/M2
650 GR. SIZE: 762 x 1117 x 10mm
SALES TAX: 15.3% M.S.T.
PRICES: RS 300/M2
SIZE: 1000 X 500 X 25 MM
SALES TAX: 15.3 % M.S.T.
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C 518 Test method for Steady State Heat Flux Measurement and Thermal Transmission Properties by means of the Hea
Flow meter Apparatus.
C 553 Specification for Mineral Fiber Blanket and Felt insulation (Industrial type)
F 84 Test Method for surface Burning Characteristics of Building Material.
3 CLASSES
Classes of mineral fiber block and Board insulation are for use to the following temperatures
3.1.1. Class 1 ---- 204 deg C.
3.1.2. Class 2 ---- 204 deg C
3.1.3 class 3 ---- 454 deg C
3.1.4 class 4 ---- 538 deg C
3.1.5 class 5 ----- 982 deg C
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
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3.2 These materials should be classified as rigid or semi rigid as tested in accordance with 11.1.1.
4 Terminology
4.1 Definitions C 168 shall apply to the terms used in these specifications.
5 Materials and Manufacture
5.1 Composition – The fiber shall be of mineral substance such as rock, slag or glass processed from a molten state into
Fibrous form Fibers under this specification is not asbestos.
5.2 Manufacture – Mineral fibers block and board thermal insulation shall be rigid or semi-rigid material composed of
Mineral fibers with or without binder.
6. Physical requirements
6.1 .1 Temperature of use- When tested in accordance with 11.1.7 at the intended use temperature, insulation for use
Above Ambient shall show no physical changes that adversely affect its service qualities.
6.1.2 Moisture Absorption (Water Vapor) –When tested in accordance with 11.1.8 insulation for use below ambient
Shall gain no more than 1.0% volume
6.1.3 Density- Density shown in Table 1 is for design purposes.
6.1.3.1 Density for Class 1,2,3, and 4 ---Delivered density shall not exceed that shown in table 1. When specified densitIs part of the purchase contract the specified density is a part of the purchase contract, the specified density (not delivere
Density) shall be based on a product containing 40% by weight.nonfibrous material (shot) that would be retained on a
100 mesh( 150µ m ) screen as determined by the test method in Annex A1, The density of the delivered product will
Vary that specified in direct proportion to the nonfibrous content of the delivered product. The delivered product density
Shall be determined based on single package units. The manufacturer shall furnish certification of the non-fibrous
Content of the delivered product.
6.1.3.2 DENSITY FOR CLASS 5-
Density shall not exceed that shown in table 1 .For delivered material the density shall be the specified density to which
A tolerance of no more than 10% may be applied.
STANDARD SIZES:
7.1 Standard sizes of mineral fiber block and board insulation shall be in accordance with Table 2
8 DIMENSIONAL TOLERANCE
8.1 The average measured length, width, and thickness of the insulation shall not differ from the standard dimensions
Specified by more than
8.1.1 length----12mm
8.1.2.width ---- 6mm
8.1.3 thickness---- 3mm
9WORKMENSHIP
9.1 The insulation shall not have visible defects that will adversely affect its service qualities.
10 SAMPLING
10.1 Sampling shall be conducted in accordance with method C390
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004
FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
11 . TEST METHOD11.1 Determine the properties enumerated in this specification in accordance with the following method.
11.1.1 Regidity- Use a test specimen 1 in (25mm) thick ,32in (810mm) long and from 6 to 24 in (152 to 610 mm ) wide.
Place the specimen on two horizontal, parallel ½”in (13mm) mandrel supports 30 in (760mm) apart. Measure the sag in
The center of the span from a straight line connecting two points on the surface directly above the supports after 5 min
Has elapsed. Classify as rigid a material showing a sag not greater than ½”in (13mm) Classify as semi-rigid a material
Showing a sag greater than ½” in (13mm) but that is not sufficiently flexible to be bent 90deg over a ½” (13mm) mandre
Without rapture.
11.1.2 Density—See test method C303
11.1.3 Compressive Strength—See Test method C165
11.1.4 Thermal Conductivity –See Test Method C 177 or C518
11.1.5 Linear Shrinkage—See Test method C356
11.1.6 Surface Burning Characteristics—See Test Method E-84
11.1.7 Temperature Resistance-See Test Method C 411
11.1.8 Moisture Adsorption—Section 15 of Specification C 553
11.2 PRECISION AND BIAS
11.2.1 The precision and bias of the test procedure detailed in this specification have not been determined.
11.2.2 the precision and bias of the method identified herein in other ASTM method are as specified in those methods.
12 INSPECTION
12.1 Inspection of the material shall be made as agreed upon between the purchaser and the seller as part of the purchase
Contract.
13 REJECTION13.1 If the average of the test data obtained on the pieces tested fail to confirm to the requirements of this specification
Rejection may be made in accordance with the following procedure.
13.1.1 Take, prepare, and test a second SAMPLE FROM THE SAME LOT. Average the results of the retest with the
Results of the original test to determine compliance with this specification.
13.1.2 Upon retest as described in 13.1.1. failure to confirm to this specification shall constitute grounds for rejection.
13.1.3 In case of rejection, the manufacturer or seller shall have the right to reinspect the rejected shipment and resubmit
The lot after removal of that portion of the shipment not conforming to the specified requirements.
14. PACKAGING AND PACKAGE MARKING
14.1 PACKAGING: Unless otherwise agreed upon or specified between the purchaser and the manufacturer or seller
Mineral fiber Block or Board thermal insulation shall be packed in the manufacturer’s standard commercial containers
14.2 Marking- unless otherwise specified each container shall be plainly marked with the manufacturer’s name, the
Product name, class, quality, nominal dimentions, facing and accessories, if any, of the material in the container.
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
Table 1 – Physical Requirements of Block and Boards.
Properties Class
1 2 3 4 5
DENSITY (AVG) MAX-KG/M3 160 192 192 192 320COMPRESSIVE STRENGTH(AVG) MIN-
-LOAD REQUIRED TO PRODUCE A
REDUCTION IN THICKNESS OF 10%
KPa 4 --- 1.2 --- --- 48LINER SHRINKAGE (LENGTH) AFTER
SOAKING HEAT (AVG.) MAX % TESTED
AT MANUFACTURER’S TEMPERATURE
LIMIT Below2.0 Below2.0 Below 2.0 2.0 4.0
THERMAL CONDUCTIVITY (AVG) MAX.
DEG C W/m K AT MEAN TEMPERATURE
-4 0.035 0.035 - - -10 0.036 0.036 - - -24 0.037 0.037 - - -38 0.040 0.040 0.043 0.043 -93 0.50 0.50 0.52 0.52 -
149 - - 0.061 0.061 0.076260 - - - 0.091 0.092370 - - - - 0.110480 - - - - 0.128Surface burning charasteritics (all class)
Flame spread classification Not greater than 25
Smoke density Not greater than 50
Test in accordance with Recommended Practice C165, Procedure B except (l) use
Samples in 50.8mm thick 38.7 cm2 condition class 2 material at 204 deg c and class 5
Material at 982 deg C in accordance with Test method C411 before testing. Measure
Initial thickness of class 2 material while bearing a preload of 0.12kPa and class 5Material while bearing a preload of1.72 kPa.Contact the manufacturer for compressio
Strengths of class 1,3 and 4 material.
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
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Will give an added benefit of nearly 12% added efficiency.
Summary:
Laboratory tests have shown that double layer, staggered joint construction is best
Method for insulation of pipes and equipments.ovens or even furnaces. Comparisons
Of heat losses of thick wall single layer and thick wall double layer construction
Showed that the heat loss for single layer construction averaged 12% higher than the
Heat loss using double layer construction.
Objective:
This project was designed to compare heat losses of thick insulation installed by
Different construction methods to develop information which can be used in the
Economic evaluation of single layer and double layer construction.
Description:Samples of 3 N 5-1/2” pipe insulation were made using single layer and staggered
Double layer sN3 and 9 N 2-1/2”. These samples were tested using method ASTM -
- C 335 STANDARD TEST METHOD FOR THERMAL CONDUCTIVITY OF
PIPE INSULATION. The test method was modified slightly to include an end joint
In the metered test section. This change makes the test more practical and less
Analytical.
As a check on the single layer test, a sample of single layer insulation was made by
Gluing two layers together.
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
RESULTS(THIS DATA WAS PUBLISHED BY PABCO INSULATION DIV.
IN THE PABCO TECHNICAL BULLETIN)
TABLE 1
THERMAL PERFORMANCE OF THICK
WALL PIPE INSULATION
APPARENT THERMAL CONDUCTIVITY
MEAN SINGLE GLUED DOUBLE LAYER Efficiency
TEMPERATUR ELAYER DOUBLE LAYER STAGGERED JOINT Improved
300 0.493 0.492 0.423 15%400 0.560 0.556 0.493 12%
500 0.636 0.629 0.560 12%
600 0.723 0.711 0.637 12%
Test Method – ASTM C-335- Standard Test Method for Thermal Conductivity of
Pipe Insulation. This test method was modified to include radial joint losses
ApparentThermal INCLUDES JOINT LOSSES
Conductivity
BTU/in/ft2 hr.F Single Layer
0.8
0.7 Glued Double Layer
0.6 StaggeredDouble Layer
0.5
0.4
0.30.2
MEAN TEMPERATURE 100 200 300 400 500 600
FIGURE 1 – APPARENT THERMAL CONDUCTIVITY
OF 3 N 5-1/2” PIPE INSULATIONARK –THERMAL INSULATION ENGINEERING & TRADING CO. S181 M.I.D.C. BHOSARI . PUNE-26
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
STEP 2 - APPLICATION OF THE ENERGY SAVINGRADIANT BARRIER AND REFLECTING FOIL MULTI LAYER BARRIER
The Three ways Heat is transferred are :
1. CONDUCTION: Conduction is the transfer of energy within a body or between two bodies
In physical contact. The transfer is from a higher temperature region to a low
Temperature region by tangible contact.
2. CONVECTION: Convection is the movement of mass, with its associated energy, from one
Location to another.
3. RADIATION: Radiation is the transfer of energy from higher temperature body, through
Space, to another lower temperature body or bodies some distance away. TruRadiation is the transfer of heat between these bodies which does not raise th
Temperature of medium through which the heat passes. This heat transfer is
Through electromagnetic waves, the most common example being the Sun.
Radiation is the form of transfer that most affects the common envelops and
Equipments. Up to nearly 83% of the total heat is thus transferred by radiatio
In case of Building envelops this quantum of radiation is upto 93%
Radiation Barriers work on simple and proven principle, Heat, like light, travels primarily by
Radiation, not convection (air currents) or conduction (contact). And just like light, the flow of heat
Can be reversed by simple reflection. One of the oldest applications of reflection combined with
Dead air spaces for insulation are the familiar vacuum bottle.
The first documented application of a radiant barrier was around 1872 ,when Sir James Dewar
Discovered that a reflective surface on one side of vacuum space could dramatically improve
Its ability to keep hot things hot and cold things cold. Since that development, the isolative propertie
Of reflective spaces has been a matter of scientific certainty. Neverthless, from the Dewar flask,
Ancestor of the modern thermos bottle, to the space suits of NASA’S astronauts, the saga of reflecti
Insulation has been one of vast possibilities yet unfulfilled.
In 1945 Dr Alexander Schwartz introduced an ingenious combination of multiple layers of Aluminu
Foil with a succession of dead air spaces, thus ushering in what promised to be a bright new era of Reflective building insulation. Since its secret was the ability to reflect infrared heat rays,Dr.Schwar
Named his new material INFRA.Architects, engineers and builders readily embraced this unusual bu
Scientific approach to their familiar insulation problems and by the early ‘60’s millions of square fe
Of radiant barrier had been installed.
ARK –THERMAL INSULATION ENGINEERING & TRADING CO. S181 M.I.D.C. BHOSARI . PUNE-26
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The installation of radiant barrier and reflective insulation system is a permanent way
To reduce costs. You need make only one purchase, and pay for it one time. Once the
Purchasing cost of the radiant barrier system is recouped, you never again have to pay
Out for it, but you continue to save every year. Infact you will save more money every
Year because you’ll use about the same of amount of energy, but the cost of energy thYou save will have spiraled upwards yearly.
Florida Solar Energy Center have assessed the Thermal Performance of Radiation
Barriers and presented their results for the effectiveness as under.
TABLEEFFECTIVENESS RATIOS OF THREE ATTIC/ROOF INSULATION STRATEGIES
STRATEGY EFFECTIVENESSPLAIN FIBERGLASS BATT RSI 3.55(R019) (RAW 1.00
FIBERGLASS FACING RADIATING SURFACE
SINGLE FOIL LAYER (DOUBLE SIDED FOIL WITH 1.42
AIR SPACE ON BOTH SIDES OF FOIL
FOIL FACED FIBERGLASS BATT(R019) WITH 1.82
FOIL AND AIR SPACE FACING RADIATING
SURFACES)
Effective resistances for foil faced airspaces of various depths and for various
Directions of heat flow are given in ASHRAE HANDBOOK –1981 Fundamentals
Volume.
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
Radiant –barrier effective resistance is given by;
Reff = Σ ∆ T / Σ Q
Reff = effective resistance
∆ T = temperature difference across the composite section
Q = measured heat flux into interior space
Equation above represents the steady-state definition of thermal resistance. The
Summations used in this equation are optimally accumulated over a sufficiently long
Period so that Reff converges on a constant value. A number of factors affectThis convergence are -()
1. Mean temperature across the composite,
2. Difference in temperature ∆ T across the composite.
3. The thermal storage capacitance of the material and its associated time lag.
Running resistance calculations from measured block vent skin radiant barrier
Wall data showing effect of time lag on calculations.%Difference
Resistance 100 No time lag
Q lags ∆ T by 4 hours50
0
-50
Re = Σ ∆ T/ Σ Q-100
-150 5 10 15 20 25 30 35 40 45 50 55 60 65 70
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004
FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
Difference in mean temperature produce slight variation in material conductivity k Therefore, affect thermal resistance. Large temperature differentials appear to
Cause more rapid convergence than small ones in massive components. Finally, the
Thermal storage capacitance and associated time lag of composites can have
Substantial effect on Reff.The time lag associated with this transfer process may be
Relatively short for frame sections with low mass/storage.
At multiple reflections of heat with each foil separated by low mass boards (having
-Low heat storage will at each stage reflect back the heat to the source.
Some typical values for emissivity of surfaces are given below
TABLE OF EMISSIVITY CO-EFFICIENTS
NATURE OF SURFACE TEMPERATURE OF SURFACE38 DEG C 260 DEG C
ALUMINUM – POLISHED 0.04 0.06
ALUMINUM – OXIDIZED 0.11 0.12
WHITE SURFACES-WHITE OR CREAM 0.95 0.88
DARK PAINTED SURFACE 0.95 0.90
ALUMINUM PAINTS 0.65 0.64
IRON & STEEL – POLISHED 0.06 0.08
IRON & STEEL –POLISHED CASTING 0.07 0.10
IRON & STEEL –OXIDIZED CASTING 0.63 0.66
ROUGH STEEL PLATE 0.94 0.97
OXIDIZED STEEL PLATE 0.79 0.79
CALORISED STEEL PLATE 0.50 0.53FABRIC FINISHES- PAINTED (APPROX) 0.95 0.90
ZINC INCL G.I. STEEL POLISHED 0.04 0.06
ZINC INCL G.I. STEEL OXIDISED 0.11 0.12
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.S ‘181’M.I.D.C. BHOSARI-26
ARK-THERMAL INSULATION ENGINEERING & TRADING CO.
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73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004
FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
HEAT LOSS AND SURFACE TEMPERATURE FOR DIFFERENT EMISSIVITIES
O.D.IN EMISSIVITY Fc+fr CORRESPONDING SURFACE
HEAT LOSS TEMP. DEG .FPIPE b.t.u.per sq.ft .hr
2” 0.1 1.005 32 x 1.0005=32.2 116
2 0.9 1.897 32x `.987 = 60.7 102
16” 0.1 0.642 32x0.642=20.5 135
16” 0.9 1.534 32x1.534=49.1 100
From the above it is observed that with highly polished surfaces corresponding heatLoss is reduced and surface temperature is increased.
How the multiplayer system worksTransient temperatures in a translucent, two layer composite following the sudden
Application of radiation to the boundary at x =0. Scattering in the first layer shields
The second layer from incident radiation, resulting in low temperature in the second
Layer.(optical thickness of layer,k;refractive index,n; scattering albedo,Ω thickness
Of composite, D; and initial temperature Ti) The similar phenomenon will appear
In a subse
1.30
Dimension INTERFACE Layer 1Less 1.25 K1=10
Temperature Ni=1.5
T(x,t)/Ti 1.20 Ω I= 099
1.15 LAYER 2
K2=5
1.10 N2=3
Ω 2=0
1.05
1.00
0.0 0.2 0.4 0.6 0.8 1.0
Dimensionless position x/DARK-THERMAL INSULATION ENGINEERING & TRADING CO. S ‘181’M.I.D.C. BHOSARI-26
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189
INFLUENCE OF DENSITY IN THE INSULATION
DENSITY OF THERMOFIT BOARDS IS 300KG/M3 AS AGAINST THE 120KG DENSITY OF
ROCKWOOL IT WAS OBSERVED AT M/S PRIMA ENGINEERING INDUSTRIES WHO ARE
MANUFACTURING BREAD BAKING OVENS WITH TEMPERATURES OF 300 DEG. C.
WITH 150MM INSULATION OF L.R.B. ROCKWOOL MATTRESS AND 1/2 INCH PLASTER OF PARIS WITH 50 MICRON ALUMINUM FOIL AS REFLECTING BARRIERS GAVE
SURFACE TEMPERATURE OF 71 DEG C WITH COST OF INSULATION FOR THE BATCH
TYPE OVEN AS Rs 13,500/=. WHEN WE SUGGESTED THE THERMO FIT BOARDS WITH
TWO INCH INSULATION IN TWO LAYERS DULY STAGGERED JOINTS, GAVE THESURFACE TEMPERATURE OF 65 DEG C WITH THE COST OF Rs 9,500/= THUS MAKING
A SAVING 30% IN COST OF MATERIAL. THIS HAPPENS BECAUSE OF THE RADIATIVE
COMPONENT OF HEAT LOSS IS DEPENDENT ON DENSITY AND DENSITY OF
THERMO FIT BOARDS IS 300KG/M3. IT IS EXPLAINED AS UNDER.
INFLUENCE OF DENSITY IN THE INSULATION FOR A GIVEN FIBERIZING CONDITIONS AND AT A FIXED TEMPERATURE THETHERMAL CONDUCTIVITY IS GIVEN BY
λ T = A + B ρ + C/ ρ
WHERE A,B,C ∂λ / ∂ρ ARE FUNCTIONS OF TEMPERATURE
THUS WE CAN WRITE
δ λ / δ ρ = B - C/ ρ 2 = f ( T,ρ )
THE C / ρ FORM REPRESENTS THE RADIATIVE COMPONENT OF THE HEATTRANSFER AND CONSEQUENTLY, AN INCREASE WITH TEMPERATURE C
INCREASES AS T INCREASES. THERE FORE FOR A GIVEN DENSITY THE SLOP
OF THE CURVE λ = f ( ρ ) INCREASES WITH TEMPERATURE .THIS MEANS THAT THE INFLUENCE ON THERMAL CONDUCTIVITY IS EVEN
GREATER AT HIGHER TEMPERATURES.
TO QUANTIFY THIS INFLUENCE IN A GIVEN CONFIGURATION THE
δ λ / δ ρ AT 400ºC ≅ δ λ / δ ρ 24 º C
100KG/M3 30KG/M3
ARK – THERMAL INSULATION ENGINEERING & TRADING CO. S 181 M.I.D.C. BHOSARI PUNE-411 026
IS DECREASED.
8/6/2019 Aaaa Miracles Do Not Happen
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ARK-THERMAL INSULATION ENGINEERING & TRADING CO.73/3/3 ; “NAMASTESTU”; BHAKTI MARG; FILM INSTITUTE ROAD;ERANDWANA PUNE-411004FAX NO:020-5430501;PHONE:020-5461555/5469112; MOBILE:9823023950;E-MAIL:[email protected]
FACTORY: S ‘181’ M.I.D.C. BHOSARI, PUNE-411 026.FAX/PHONE:020-7122189