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है”ह”ह

IS 12933-2 (2003): Solar Flat Plate Collector, Part 2:Components [MED 4: Mechanical Engineering]

REAFFIRMED

2003IS 12933 ( Part 2 ) : 2003

'Jif f\:!6) l/ AFi C/?

Indian StandardSOLAR FLAT PLATE COLLECTOR-SPECIFICATION

PART 2 COMPONENTS

( Second Revision)

ICS 27.160

© BIS 2003

BUREAU OF INDIAN STANDARDSMANAK BHA V AN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

June 2003 Price Group 2

AMENDMENT NO. 1 JUNE 2005TO

IS 12933 (PART 2): 2003 SOLAR FLAT PLATECOLLECTOR - SPECIFICATION

PART 2 COMPONENTS

( Second Revision)

( Page 2, clause last sentence) - Substitute the following for theexisting:

'The ball shall be cleaned after each test. '

(ME04)Reprography Unit, BIS, New Delhi, India

AMENDMENT NO.2 DECEMBER 2008

TO

IS 12933 (pART 2) : 2003 SOLAR FLAT PLATE

COLLECTOR - SPECIFICATION

PART 2 COMPONENTS

( SecondRevision)

(Page 1, clause 6.1) - Substitute the following for the existing:

'The collector box shall bemade ofany ofor any combination of the followingmaterials:

a) Aluminum alloy conforming to IS 737 or IS 733,b) Fibre glass conforming to IS 10192,c) CRCA steel sheet conforming to IS 513,d) Galvanized steel sheets conforming to IS 277, ande) HRC steel sheets conforming to IS 1079.

[Page 2, clause 6.2(i)(a)] - Substitute' 1.4' for' 1.6'.

[Page 2, clause 6.2(i)(b)] - Substitute '0.45' for '0.7'.

(Page 2, clause 7.3.1, line 2) - Substitute 'Fig. l' for 'Fig. 9'.

(ME 04)

Reprography Unit,BIS,New Delhi,India

Non-conventional Energy Sources Sectional Committee, ME 04

FOREWORD

This Indian Standard (Part 2) (Second Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Non-conventional Energy Sources Sectional Committee had been approved by the MechanicalEngineering Division Council.

This standard was first published in 1990. It was revised in 1992 with a view to align it with the latest technologyand also practices being followed in the Indian industries to make it more amenable to certification. The componentswere covered in six sections and the requirements of cover plate, collector box, absorber and insulation weremodified.

In this revision attempt has been made to remove restrictions in use ofmaterial for various components like coverplate, collector box and its insulation, etc, requiring the collector to meet the performance requirements andkeeping rooms for innovations and improvements.

In order to facilitate the reference and use, this standard is one of a series of solar flat plate collector standards.Other standards are as follows:

IS No.

IS 12933

(Part I) : 2003

(Part 3) : 2003

(Part 5) : 2003

Title

Solar flat plate collector- Specification:

Requirements (second revision)Measuring instruments (first revision)Test methods (second revision)

Part 4 ofthis standard which covered performance requirements and acceptance criteria for solar flat plate collectorswas subsequently withdrawn and its contents incorporated in Part 1.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2:1960 'Rules for rounding off numerical values (revised)'. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 12933 (Part 2) : 2003

Indian StandardSOLAR FLAT PLATE COLLECTOR-SPECIFICATION

PART 2 COMPONENTS

( Second Revision )

1 SCOPE

J. J This standard (Part 2) specifies the requirementsfor various components of solar flat plate collector forwater heating.

1.2 This standard does not apply to the following:

a) Collector in whom heat transfer fluid maychange phase, that is, the collectors designed fornormal fluid temperature above 100°C withwater as the heat transfer fluid,

b) Concentrating collectors, used in a systemdesigned to generate mechanical energy/electricity,

c) Collectors in which the thermal storage unit isan integral part of the collector so that thecollection and the storage processes cannot beseparated,

d) Unglazed flat plate collector,

e) Installation or mounting of solar collectors, and

f) Tracking mechanism of the sun followingcollector system.

2 REFERENCES

The standards given in Annex A contain provisions,which through reference in this text, constituteprovision of this standard. At the time of publication,the editions indicated were valid. All standards aresubject to revision, and parties to agreements based onthis standard are encouraged to investigate thepossibility of applying the most recent editions of thestandards.

3 TERMINOLOGY

For the purpose of this standard, the terminology anddefinitions given in IS 12934 shall apply.

SECTION 1 COVER PLATE

4 MATERIAL

The cover plate shall be of tempered/toughened glass[see IS 2553 (Part 1)]. The solar transmittance of thecover plate shall be minimum 82 percent at near normalincidence. The glass shall be free from bubbles and

rough surface and shall satisfy the requirements givenin 5.

5 TEST

5.1 Transmittance Test

5.1.1 Transmittance test is performed at the end of testsequence recommended in 40fIS 12933 (Part 5).

"\

5.1.2 The cover glass of the solar collector shall beremoved and mounted on (1 test frame facing due south.The tilt ofthe cover glass shall be kept so as to facilitatemeasurement ofsolar radiation on the glass surface nearnormal incidence. In no case, the angle of incidenceshall deviate more than 15° from the normal incidence.

5.1.3 The global solar radiation shall be measured usinga pyranometer on the surface ofglass cover for a periodof 5 min and the values shall be integrated. Just after,similar measurements ofthe global solar radiation shallbe made at the same inclination through the glass coverfor a duration of next 5 min and the values shall beintegrated. The ratio of the integrated values of theglobal solar radiation received through the glass coverand that received without glass cover shallbe calculated.This ratio shall represent transmittance value for thecover glass. .

5.1.4 This test shall be carried out on a clear sunnyday and near solar noon so as to minimize effect ofdiffuse and reflected components of solar irradianceon the value of transmittance of the cover glass.

SECTION 2 COLLECTOR BOX

6 MATERIAL

6.1 The collector box may be made of material orcombination of materials as given below:

a) Aluminium (AI) (see IS 737 or IS 733),

b) Fibre glass (see IS 10I92),

c) Cold rolled carbon annealed (CRCA) steel sheet(see IS 513),

d) Galvanized steel sheets (GS) (see IS 277), and

e) Hot rolled carbon steel sheet (HRC) (see IS1079).

IS 12933 (Part 2) : 2003

6.2 The minimum thickness of the materials, specifiedin 6.1, shall be as given below:

7.t All the surfaces shall be smooth and free fromroughness, raised spots, scale or any other surfacedefects. Sharp edges and comers shall be rounded off.

7.2 The collector box when made of CRCA or HRCsheets, shall be given corrosion resistance coating onboth sides. These coatings may be of the followingtypes and if used shall satisfy the requirements givenagainst each:

7.3.1 The apparatus required for this test shall be asgiven in Fig. 9 ofIS 5116. It comprises of a steel ballof 1mm diameter, which is fixed at the end ofa counter-poised arm. The arm is kept horizontal.

7.3.2 The above apparatus shall be applied to thesurface under test. The ball shall be moved after loadingwith not less than 1 500 g at a speed of3-4 cm/s relativeto the surface. Ifthe indicator bulb lights, the surface isdeemed to have been penetrated. For metallic paints, avisual examination of the scratch shall be necessary inorder to determine whether the film has been penetrated.The finish is deemed to have failed if the scratch hasjagged edges, is greater than 1 mm wide, or penetratesthe film. The ball shall be cleaned after each test andshall be inspected to verify that its diameter is 1 mm.

iv) CRCAlHRC

9.2.1 Static Pressure Leakage Test

Riser and header assembly designed for workingpressure up to 245 kPa (2.5 kg/crn-) shall be tested for

9.2 RISER AND HEADER

SECTION 3 ABSORBER

9 ABSORBER

8 FABRICATION

8.1 For aluminium boxes, inert arc welding or gasbrazing may be used to weld the side channels at thecomers. Bottom sheet may be joined with spot weldingor self-threaded nickel-plated screws. In case ofa screwjoint, wooden battens shall be provided to secure thescrews. The screwed/riveted joints shall be made leakproof by sealing paste of zinc oxide based or rubberbased or silicon rubber based or epoxy basedcompound.

8.2 Fibre glass boxes shall be constructed in a singlemould without any joint. Boxes shall have metal stripembedded wherever screws are to be fixed for mountingthe glass.

8.3 A box shall be made of Al/CRCA/HRC/Galvanizedsteel/any other material as specified in 6.2 throughwelding/rivetting. The rivetted joints shall be madeleak proof by sealing paste as per 8.1.

9.1 The absorber shall consist of risers, headers andsheet for absorber.

9.1.1 The absorber may be of copper, aluminium,stainless steel or mild steel with proper protectivecoating. The thickness ofthe sheets shall be chosen soas to ensure adequate strength and stability against thepressures to prevent swelling, distortion or ruptures.

9.1.2 There are two types ofabsorber, namely: (a) withselective coating, and (b) with non-selective coating.Absorber shall conform to the temperature testperformed in accordance with 9.1.4.

9.1.3 The exposed side of absorber when painted, shallbe degreased and suitable primer shall be used prior tothe application of paints (preferably mat black stovingenamel paint). The paint shall satisfy the requirementsof withstanding temperature as given in 9.1.4 withoutshowing any damage or discoloration.

9.1.4 Temperature Test

A sample piece of the absorber having minimum areaof400 clll2 shall be heated in an oven at temperature of175°C for 2 h. After heating, the sample shall be takenout from the oven and cooled at room temperature. Thecooled sample shall be inspected visually for damages,if any. There shall not be any appearance of blistering/ rupture / peeling offof the coated/painted surface andof.weakening of the bonding between absorber sheetand risers / headers.

1.6

0.7

1.2

1.0

3.0

0.80

0.91

Resistance toabrasion as per7.3

Resistance toabrasion as per7.3

I) Thickness asper 9.2.1 ofIS 1573

2) Adhesion testas per 9.3 ofIS 1573

Test to beQualified

(4)

Thickness, Minmm

Material

c) Powder coating 40 lim, Min

i) Aluminium:

a) Channel section for sides

b) Sheet for bottom

c) Support for glass retaining

d) Sheet for entire body

ii) Fibre glass

iii) Galvanized/stainless steel sheet

Sf.No.

7.3 Resistance to Abrasion

Base Type ofCoating ThicknessMaterial

(I) (2) (3)

Steel a) Painting

b) Electroplated 40 lim, Minzinc coating(see IS 1573)

7 WORKMANSHIP AND FINISH

2

leakage at a minimum hydraulic pressure of 4?0 kPa(5 kg/ern"). For the system designed for higher pressurethan 245 kPa (2.5 kg/cm-), the assembly shall be testedat a pressure twice the design pressure. This testshall be performed in accordance with 5.3 ofIS 12933(Part 5).

9.2.2 Bonding Between Riser and Sheet

9.2.2.1 Full length of all risers shall be welded withabsorber sheet. In case of brazing! soldering! TIGwelding of continuous nature, unbrazed/ unsolderedportion should not exceed more than 10percent of thelength of riser. For brazing/soldering, minimum 60percent tin solder or suitable brazing material shall beused. The flux used for soldering/brazing shall be non-greasy.

9.2.2.2 In case of bonding of aluminium sheet andcopper tube, only rolled bond/pressure bond absorberjoint shall be accepted.

SECTION 4 COLLECTOR BOX INSULATION

10 BACK AND SIDE INSULATION

10.1 Insulation shall be provided at back and sides.Thermal resistance (R) of insulation material shall beminimum 0.96 m? DC/W for back insulation andminimum 0.48 m2 DC/Wfor side insulation. This shallbe derived after determining thermal conductivity (K)value at 100DC mean temperature in accordance withIS 3346.

NOTE - Thermal resistance (R) value shall be derived by

the equation R = UK .

where L is thickness of insulation material and K is thermal

3

IS 12933 (Part 2) : 2003

conductivity. Thermal conductivity shall be determined at 100°C mean temperature in accordance with IS 3346.

10.2 Aluminium foil shall be used for covering theback as well as side insulation.

SECTION 5 GASKETS AND GROMMETS

11 MATERIALS

11.1 Gaskets used for sealing the glass with collectorbox may be ofneoprene/silicon/EPDM rubber channelsection.

11.2 Grommets for sealing the collector box and headerjoint may be one of the following type and shall fitproperly so that no dust can pass through the joints:

a) Neoprene rubber,

b) EPDM"

c) Silicon rubber, and

d) In situ formation of any of the above material.

12 TEST

12.1 Grommets and gaskets shall conform to thethermal shock test given in 12.1.1.

12.1.1 Thermal Shock Test

The sample ofgasket and grommets shall be kept in anelectric oven at a temperature of 125DC for 4 h. Afterheating, the samples shall be taken out and cooled inair for 2 h and shall again be put in the oven at 125°Cfor 4 h. The sample shall be taken out and cooled andshall be inspected for any appearance of cracks orbrittleness.

IS 12933 (Part 2) : 2003

ANNEXA

(Clause 2)LIST OF REFERRED INDIAN STANDARDS

IS No.

277 : 1992

513 : 1994

733: 1983

737: 1986

1079: 1994

1573: 1986

Title

Galvanized steel sheets (plain andcorrugated) (fifth revision)

Cold-rolled low carbon steel sheetsand strips (fourth revision)

Specification for wrought alumini-um and aluminium alloy bars, rodsand sections for general engineeringpurposes (third revision)

Specification for wroughtaluminium and aluminium alloysheet and strip for generalengineering purposes (thirdrevision)

Hot rolled carbon steel sheets andstrips (fifth revision)

Specification for electroplatedcoatings of zinc on iron and steel(second revision)

4

IS No.

2553

(Part 1): 1990

3346: 1980

5116: 1996

10192:1982

12933 (Part 5) :2003

12934: 1990

Title

Safety glass - Specification

Part 1 : General purpose (thirdrevision)

Method of the determination ofthermal conductivity of thermalinsulation materials (two slabguarded hot plate method) (firstrevision)

Domestic and commercialequipment for use with LPG-General requirements (thirdrevision)

Synthetic resin bonded glass fibre(SRBGF) sheets for electricalpurposes

Solar flat plate collector-Specification: Part 5 Test methods(second revision)

Solar energy -Thermal applica-tions Vocabulary

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Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of'BIS Catalogue' and 'Standards: Monthly Additions'. '

This Indian Standard has been developed from Doc: No. ME 04 (0549).

Amendments Issued Since Publication

Amend No. Date ofIssue Text Affected

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AMENDMENT NO. 3 MAY 2013

TO

IS 12933 (PART 2) : 2003 SOLAR FLAT PLATE

COLLECTOR — SPECIFICATION

PART 2 COMPONENTS

(Second Revision)

(Page 2, clause 8.1) — Insert the following at the end of the clause: ‘Use  of  self  locking  joints  is  also  acceptable.’   (Page 3, clause 9.2.2.2) — Substitute the following for the existing clause: ‘9.2.2.2 In case of bonding of aluminium sheet and copper tube, rolled bond/ pressure  bond  absorber  joint/use  of  laser  welding  shall  be  accepted.’ (Page 3, clause 9.2.2.2) — Insert the following new clause after 9.2.2.2: ‘9.2.3 Fluid passages may not be in the form of riser and header configuration but these shall be subjected to pressure testing and other performance requirements.’

(MED 04)

Reprography Unit, BIS, New Delhi, India