HAREDA PROCEDURE FOR MANDATORY INSTALLATION OF SOLAR WATER HEATING SYSTEMS IN HARYANA

Transcription

1 HAREDA PROCEDURE FOR MANDATORY INSTALLATION OF SOLAR WATER HEATING SYSTEMS IN HARYANA Haryana Renewable Energy Development Agency (HAREDA) (Department of Renewable Energy, Haryana) SCO-48, Sector-26, Chandigarh Tel: , Fax: website- 1

2 INTROUCTION TO SOLAR WATER HEATING SYSTEM Haryana is blessed with Solar Energy in abundance at no cost. The solar radiation incident on the surface of the earth can be conveniently utilized for the benefit of human society. One of the popular devices that harnesses the solar energy is solar water heating system (SWHS). Solar Water Heating is a Renewable Technology which can be used to meet the hot requirement in domestic, Commercial and Industrial Sector. A solar water heater consists of a collector to collect solar energy and an insulated storage tank to store hot water. The solar energy incident on the absorber panel coated with selected coating transfers the heat to the riser pipes fitted underneath the absorber panel. The water passing through the riser get heated up and is delivered to the storage tank. The re-circulation of the same water through absorber panel in the collector raises the temperature to 80º C (Maximum) in a good sunny day. The total system with solar collector, storage tank and pipelines is called solar hot water system. Broadly, the solar water heating systems are of two categories. They are: closed loop system and open loop system. In the first one, heat exchangers are installed to protect the system from hard water obtained from bore wells or from freezing temperatures in the cold region. In the other type, either thermosyphen or forced circulation system, the water in the system is open to the atmosphere at one point or other. The thermosyphen systems are simple and relatively inexpensive. They are suitable for domestic and small institutional systems, provided the water is treated and potable in quality. The forced circulation systems employ electrical pumps to circulate the water through collectors and storage tanks. The choice of system depends on heat requirement, weather conditions, heat transfer fluid quality, space availability, annual; solar radiation, etc. The SHW systems are economical, pollution free and easy for operation in warm countries like outs. Based on the collector system, solar water heaters can be of two types. Flat Plate Collectors (FPC) based Solar Water Heaters (SWH) The Solar radiation is absorbed by Flat Plate Collectors which consists of an insulated outer metallic box covered on the top with glass sheet. Inside there are blackened metallic absorber (selectively coated) sheets with built in channels or riser tubes to carry water. The absorber absorbs the solar radiation and transfers the heat to the flowing water. There are 83 BIS approved manufacturers of Solar Flat Plate Collectors. Evacuated Tube Collectors (ETC) based Solar Water Heaters (SWH) Evacuated Tube Collector is made of double layer borosilicate glass tubes evacuated for providing insulation. The outer wall of the inner tube is coated with selective absorbing material. This helps absorption of solar radiation and transfers the heat to the water which flows through the inner tube. The MNRE, GOI approve 2

3 ETC based solar water heating system. However, this being a new technology, it is advised that before installing the ETC based system, the buyer should ensure proper specification and test reports of the system issued by the Ministry of New and Renewable Energy, Govt. of India. Solar water heating is now a mature technology. Wide spread utilization of solar water heater scan reduce a significant portion of the conventional energy being used for heating water in homes, factories and other commercial and institutional establishments. Internationally the market for solar water heaters has expanded significantly during the last decade. Salient Features of Solar Water Heating Systems Solar Hot Water system turns could water into hot water with the help of sun s rays. Around 60 deg. 80 deg. C temperature can be attained depending on solar radiation, weather conditions and solar collector system efficiency Hot water for homes, hostels, hotels, hospitals, restaurants, dairies, industries etc. Can be installed on roof-tops, building terrace and open ground where there is no shading, south orientation of collectors and over-head tank above SWH system SWH system generates hot water on clear sunny days (Maximum), partially clouded (moderate) but not in rainy or heavy overcast day Only soft and potable water can be used Stainless Steel is used for small tanks whereas Mild Steel tanks with anticorrosion coating inside are used for large tanks Solar water heaters (SWHs) of litres capacity are suited for domestic application. Larger systems can be used in restaurants, guesthouses, hotels, hospitals, industries etc. Space Requirement Approx. 3 sq. meter shadow free South facing space is required for 100 lpd system having one collector. Fuel Savings: Depending upon the fuel replaced, the annual savings by a 100 LPD solar water heater are as under: Fuel Calorific Value Efficiency (%) Fuel Saved ( K Cal/Kg) (KG/Annum) Firewood Kerosene LPG Charcoal Diesel Electricity (KWH) Avoided utility cost on generation: 3

4 The use of 1000 nos. of Solar water heating systems of 100 litres capacity each, can contribute to a peak load shaving of 1 MW, assuming that 50% of the Electrical Geysers, each of 2 KW capacity are in use during peak hours. Environmental benefits: A SWH of 100 litres capacity can prevent emission of 1.5. Tonnes of carbondioxide per year. Life: years Approximate cost: Around Rs for a 100 litres capacity SWH Rs per installed litre for higher capacity systems Payback period: 2-3 years when electricity is replaced 4-5 years when furnace oil is replaced 6-7 years when coal is replaced Though the initial investment for a solar water heater is high compared to available conventional alternatives, the return on investment has become increasingly attractive with the increase in prices of conventional energy. The pay back period depends on the site of installation, utilization pattern and fuel replaced. ESTIMATES OF REQUIREMENT OF HOT WAT ER SOME USEFUL THUMB RULES Application Typical Requirement of Hot Water at 60 C Household bathing using buckets liters per person per bath Household bathing using shower Litres for 10 Minute bath Shaving, while a tap runs Litres Household bathing in bathtub ( one filling) Litres Wash basin (hand wash, brushing of teeth, etc.) 3-5 Litres per person per day Kitchen washing 2-3 Litres per person per day Dish washer Litres per washer cycle Clothes washing machine Litres per Wash cycle Industrial Canteen 3-5 Litres per worker per day Small unstarred hotels litres per occupant per day Starred hotels Litres per room per day Hospitals Litres per bed per day Multistoried apartments: (revised on ) Number of stories Flat Size New Capacity Norms of SWHS per Flat G+4 2 BHK 100 lpd 3 BHK and above lpd G+5 to G+9 2 BHK lpd 3 BHK and above lpd G+10 to G+14 2 BHK lpd 3 BHK and above 75 to 100 lpd G+15 to G+20 & above 2 BHK 35 to 50 lpd 3 BHK and above 35 to 75 lpd Note : All the estimates are given for hot water at 60º C. This hot water has to be mixed with cold water to bring down its temperature to endurance limits. Mixing will also increase quantity of hot water actually required. 4

5 MANDATORY USE OF SOLAR WATER HEATING SYSTEMS Vide Haryana Government Gazette Notification No.22/52/2005-5P dated 29/7/05, the use of solar water heating systems has been made mandatory in industries where hot water is required for processing, hospitals and Nursing Homes, Govt. Hospitals, Hotels, Motels and Banquet Halls, Jail barracks, Canteens, Housing Complexes set up by Group Housing Societies/Housing Boards, all Residential buildings built on a plot of size 500 sq.yds. and above falling within the limits of Municipal Committees/Corporations and HUDA Sectors, all Govt. buildings, Residential Schools, Educational Colleges, Hostels, Technical/Educational Institutes, District Institute of Education and Training, Tourism Complexes and Universities etc. HAREDA has been declared as an approved sources for supply and installation of solar water heating systems in the State to ensure installation of optimally designed quality systems as per the specifications. In order to streamline the installation of Solar Water Heating Systems in the State, following procedure has been laid: PROCEDURE FOR MANDATORY INSTALLATION OF SOLAR WATER HEATING SYSTEMS 1. Application: The applicant will be required to apply in the prescribed format for capacity approval / approval of provision of Solar Water Heating Systems in the buildings (for new building at the time of start of construction of the building). The application must be accompanied by approved drawing of the building which clearly shows terrace plan of buildings. The format would includes, name of the building, architect, occupancy. No. of toilets, kitchens, covered area and area available in the terrace for installation of SWHS. For domestic systems and systems up to 1000 lpd capacity the application should be submitted to the ADC-cum-CPO (IREP) office of the concerned district. For non-domestic, Group Housing, industrial and commercial categories, systems of capacity more than 1000 lpd capacity the application should be submitted to the Director, HAREDA, SCO No.-48,Sector- 26,Chandigarh.. The ADC Office/HAREDA may call for any additional information if required for assessment of hot water requirement of the proposed building. 2. Fee The applicant will be required, to pay non-refundable processing fee of Rs. 50/- per square meter of the collector area of the system in the shape of a Demand Draft in favour of Director, HAREDA payable at Chandigarh along with the application. 3. Assessment of hot water required: Within one month from the date of receipt of application, the site will be inspected by the Project Officer/ APO of the concerned district/hareda for the assessment of hot water requirement of the Project. Based on the assessment of hot water, a letter for making provision of recommended capacity of Solar Water Heating System for the proposed building will be issued. The ADC offices shall issue the letter for accordingly approval on 5

6 the capacity of the systems to be taken up for installation of capacities upto 1000 LPD. While for capacities more than 1000 LPD, the letter recommending the capacity of SWHS in the proposed building will be issued by the Director, HAREDA. 4. Minimum Technical Specification The system to be installed must be comply with minimum technical requirement of MNRE/HAREDA for FPC & ETC Based Solar Water Heating System attached at Annexure-I & II. Further, the applicant also takes declaration from manufacturer that his system comply with latest minimum technical requirement as mentioned above. 5. Supervision of Installation: The applicant will be required to intimate the ADC office/hareda about the start of installation of Solar Water Heating System. The site will be inspected by the PO/APO during the installation phase to check the quality and capacity of the system. 6. Issuance of NOC Once the Solar Water Heating System has been installed, the applicant will be required to apply for issue of NOC in the prescribed format. The application must be accomplished by requisite document viz. capacity approval letter from HAREDA/PO of the concern districts, allotment letter from HUDA/MC, Registration Certificates, Supplier BIS/MNRE Approved Test Certificate, Joint Commissioning Report, SWHS layout, Photographs of installed SWHS & Declaration by the Manufacturer to comply with MNRE/HAREDA minimum technical specification for Solar Water Heating System. The ADC office will issue the NOC to the concerned authority i.e. HUDA/HSIDC/Municipal Corporation/ Urban Dev. Department after verifying the installation of solar Water Heating system in case of system upto 1000 LPD capacity. For systems of capacity more than 1000 LPD, the NOC will be issued by Director, HAREDA after joint inspection by a team of officers from the concerned district and HAREDA. 7. Installation of SWHS on deposit work basis HAREDA has expert manpower to design, supervise and install Solar Water Heating Systems as per the BIS specifications. HAREDA has been declared approved source for supply, installation and commissioning of Solar Water Heating Systems in the Haryana State. For the building project of private developers also, HAREDA may get the Solar Water Heating systems installed for which it will charge 5% of the system cost as service charges. -x- 6

7 FORMAT OF APPLICATION FOR CAPAPCITY APPROVAL OF SOLAR WATER HEATING SYSTEM 1. Name of the applicant: 2. Complete address 3. Site Address 4. Name of the architect: 5. Details of the site 6. Total covered area of the project: 8. No. of towers/storeys in each tower/dwelling units/ Type of flats/ rooms (in case of hotels)/ Beds (in case of Hospitals) etc 9. Size of the dwelling unit 10. No. of BHK in each unit 11. No. of toilets in each dwelling unit(du): 12. Occupancy in each DU: 13. Building plan attached 14. Terrace plan attached: 15. Load bearing capacity of the roof: Should be more than 50 Kg per m2 16. Consultants report on installation of SWHS attached; 17. Details of processing fee: D.D. No. Dated Amount Bank 18. Proposed capacity of SWHS as per HAREDA norms: 19. The list of document attached with this application: a) Processing fees as per HAREDA norms. b) Attached Building Plan of the building. c) Attached Terrace plan of the building which clearly shows shadow free area on terrace. d) Registration Certificate. e) Proposed layout plan of Solar Water Heating System. * For the existing building Sr. No.-3,4,5 are not mandatory. Signature of the authorised signatory 7

8 FORMAT OF SITE CLEARANCE/ VERIFICATION REPORT FOR CAPACITY APPROVAL OF SWHS TO BE SUBMITTED BY PO/APO 1. Proposed site of installation: 2. Site inspected on: 3. Details of the user: a) Name of the user/ developer: b) Head of the organization: With address c) Site Incharge / Contact person: d) Telephone nos/fax: 4. No. of dwelling units with size and BHK configuration of each: 5. Availability of cold water on roof: 6. Proposed use of hot water: 7. Shadow free space on roof: Available or not Available (approx. sq.m.) Building wise. 8. Load bearing capacity of the roof: 9. Electricity: Available/Not available 10. Approx. length of piping required: i) Hot- NB: m. ii) Cold -NB: m. 11. Availability of skilled worker for Maintenance of the system: 12. Comments on site: The solar water heating system of lpd Capacity is recommended / Not recommended. Proposal examined and all documents attached. 13. Final recommendation of HAREDA Project Officer/Asstt.PO Proposal found as per HAREDA norms. Capacity to be installed LPD. Auth. Signatory of HAREDA 8

9 FORMAT FOR APPLICATION FOR ISSUE OF NOC ON INSTALLATION OF SOLAR WATER HEATING SYSTEM IN GROUP HOUSING SOCIETIES/REAL ESTATE TOWER/ HOTELS/ HOSPITALS/ COMMERCIAL BUILDINGS. 1. Name of the applicant : 2. Complete address : 3. Site Address : 4. Contact person & his contact details : 5. Capacity of the system required to be : Installed as per HAREDA norms. (Please give details no. of towers. Flat, type of flats & nos. of storeys in each tower). 6. Capacity approved by HAREDA/PO & APO : of concerned district. (Please give details of HAREDA Correspondence on capacity approval of SWHS). 7. Whether the capacity is as per HAREDA norms or not : 8. System supplied by (Complete address of supplier with contact no., ) : 9. Whether the supplier is on the Rate contact : Of HAREDA or BIS approved manufacturer or Dealer of BIS marked manufacturer. 10. Validity of BIS/Empanelment : 11. Whether the system is comply with MNRE/HAREDA : Minimum technical requirement of SWHS. (Please give supplier declaration in this regard) 12. Cost of the installed system with 5 years AMC : (Attach invoice) 13. Whether the subsidy is claimed : If yes, mention applicable MNRE, GOI/State Subsidy. 14. The list of document to be attached with this application: a) Capacity approval letter from HAREDA/PO of concerned district. b) Allotment letter from HUDA/MC. c) Registration Certificate. d) Joint Commissioning Report as per HAREDA format. 9

10 e) Supplier BIS/MNRE approved test certificate. f) If supplier is dealer of BIS/MNRE approved system, then attached dealership certificate. g) Final Solar Water Heating System installed layout plan. h) Declaration by manufacturer to comply with MNRE/HAREDA minimum technical specification of SWHS. i) Photograph of installed system. Undertaking by the applicant: a) We will not dismantle the system at any stage without prior written permission of HAREDA. b) We will regularly use and properly maintain the system and submit quarterly performance report for a minimum period of one year from the date of installation through ADC office. c) We have installed the system as per HAREDA norms for capacity of the system and the system is comply with minimum technical specification of MNRE/HAREDA. Signature of the authorised signatory 10

11 FORMAT OF INSPECTION / VERIFICATION REPORT FOR ISSUE OF NOC ON INSTALLATION OF SWHS IN GROUP HOUSING SOCIETIES/REAL ESTATE TOWER/ HOTELS/ HOSPITALS/ COMMERCIAL BUILDINGS TO BE SUBMITTED BY PO/APO. 1. Name of Society/Real Estate Tower/ : Hotel/Hospital/Commercial Building. 2. Site inspected on : 3. Complete Address : 4. Contact person & his contact details : Capacity of the system required to be Installed as per HAREDA norms. (Please give details no. of towers. Flat, type of flats & nos. of storeys in each tower). 5. Capacity approved by HAREDA/PO & APO : of concerned district. (Please give details of HAREDA Correspondence on capacity approval of SWHS). 6. Whether the capacity is as per HAREDA norms or not : 7. System supplied by (Complete address of supplier with contact no., ) : 8. Whether the supplier is on the Rate contact : Of HAREDA or BIS approved manufacturer or Dealer of BIS marked manufacturer. 9. Validity of BIS/Empanelment : 10. Whether the system is comply with MNRE/HAREDA : Minimum technical requirement of SWHS. 11. Availability of skilled worker for : Maintenance of the system. 12. Comment if any : It is certified that the above Society/Real Estate Tower/Hotel/Hospital/Commercial Building has undertaken the installation of Solar Water Heating System of LPD. The system capacity and system technical specification are as per norms of MNRE/HAREDA. Date : Place: Signature of inspecting Officer Name: Designation: 11

12 JOINT COMMISSIONING REPORT OF SOLAR WATER HEATING SYSTEM Certified that a solar water heating system of..liter per day capacity has been installed at.. (Name of the institute)...city....district.. by M/S... on.. (Date).The system is as per BIS/HAREDA/MNRE specifications. The system has been checked for its performance on (Date) and it is working satisfactorily. Signature of the beneficiary Signature of the rep. of supplier With name and date with name seal and date Signature of the rep. of HAREDA/ PO/APO With name and date with name seal and date 12

13 Annexure-I MINIMUM TECHNICAL SPECIFICATIONS OF VARIOUS COMPONENTS OF FPC BASED SOLAR WATER HEATING SYSTEMS. 1. ABSORBER MATERIAL Absorber shall be of copper sheet and copper tube. Thickness of sheet 34 SWG (IS 191) Riser Diameter : mm Thickness : 0.56 mm (IS 2501) Number : As per BIS Header Diameter : Minimum mm Thickness : 0.71 mm Number : 2 Projection out side: 40 mm+0.5 mm Including flanges of the collector box. Space between Riser Tubes 120 mm maximum from centre to centre of the riser. The free edges at the sides not to exceed 60 mm from the centre of the extreme end riser tube. Bonding between Riser & Sheet For independent fins or joints in the sheet an overlap of minimum 2 mm shall be provided. Full length of all risers shall be welded with the absorber sheet. In case of brazing/soldering/tig welding of continuous nature, un-brazed/un-soldered portion should not exceed more than 10% of the length of the riser. For brazing/soldering, minimum 60% tin soldier or suitable brazing material shall be used. The flux used in soldering shall be mechanically removed and neutralized with the solution of sodium carbonate to avoid corrosion after installation. The flux used should be non greasy and non corrosive. Coating Selective coating with absorptivity >0.92 and emissivity< FLAT PLATE COLLECTOR Overall Dimensions(mm) Size Length Width Height A B 2120± ±10 100±10 Variation in size acceptable providing min. 2 sq.m. area/collector. 3. COLLECTOR BOX MATERIALS Aluminium Fabrication of the Box Attachment of Bottom Sheet Aluminium extruded sections of size approximately 100 mmx25mm channel sections (within the tolerance given above) and of thickness 1.6 mm for the sides 0.71 mm aluminium sheet for the bottom (Tolerance 10%). 1.2 mm thick aluminium angle (dimensions 25mmx25mmx1.2mm) retainer for glass Side channel shall be welded by inert arc or gas brazing to ensure leak proof continuity of the joints of the box. Bottom sheet may be joined with spot welding or self threaded nickel plated screws.in case of screw joint wooden battens shall be provided to secure the screws. The screwed/riveted joint shall be made leak proof by sealing paste of Zinc Oxide based or rubber based or silicon rubber based or epoxy based sealing compounds. 13

14 4. TESTING OF RISER-HEADER ASSEMBLY 5. COLLECTOR BOX INSULATION Back Insulation It should be tested for leakage and strength at a minimum hydraulic/neumatic pressure of 5 kg/sq.cm. Insulation shall be providing at back and sides. Thermal resistance (R) of insulation material shall be minimum 0.96 sq.m deg. C/W for back insulation and minimum 0.48 sq.m deg. C/W for side insulation. This shall be derived after determining thermal conductivity (K) value at 100 deg. C mean temperature in accordance with IS The thickness of the insulation material (L) may be derived by the equation R= L/ K or the insulation materials with following specifications may be used: Material name Rock wool Glass wool Mineral wool Side insulation 6. FRONT GLAZING Material thickness Transmittance General appearance of glass Aperture area Spacing between cover plate and Absorber surface K R Thickness density W/MK sq.m/w (MM) (KG/Cum) The insulation must with stand a temperature of 250 deg. C. Aluminium foil of thickness 0.015mm to 0.021mm shall be used for covering the back insulation 25 mm thick insulation of specification as mentioned above. Aluminium foil of thickness mm to 0.021mm shall be used of covering the side insulation. Glass wool Resin Bonded/Rockwool/Rigid Polyurethene of Thickness 25mm, minimum shall be used so as to achieve R value=0.08 as per IS 3346:1980. Single piece glass Toughened mm (IS 2553(Part-I) 82% (Minimum) Free from bubbles/rough surface 2.30sq.mt.(approx.)for size A collector 20 to 40 mm 7. HEADER FLANGES Brass flanges of 62+3 mm diameter and minimum thickness of 4 mm with provision of four number of GI plated nuts bolts with diameter of 6mm-8mm shall be used. Flanges shall be brazed to the header and brazing tested for leakage at the test pressure of 10kg/sq.cm. In no case crude soldered flanges shall be used. The assembly of the flanges should be at right angle to the header area to ensure proper assembly at the site of installation. 8. GROMMET Suitable sealing between the inlet and outlet of header and casing of the following materials shall be provided. Neoprene, EPDM, Silicon rubber or butyle rubber etc. The grommet shall be suitable for a temp. upto 125 deg. C and mechanical loading during transportation of collectors. 14

15 Typical size of grommet may be 40 mm outer dia and 25mm inner dia. 9. ASSEMBLY OF COLLECTORS The load of the absorber should not be on the insulation. It should be taken by the collector box. The air gap between the glazing and the absorber should be 25mm (+5mm). Insulation should not be allowed to slide. Glazing shall be fixed on the collector box by using EPDM/Neoprene/Synthetic rubber channels. The glass should be firmly held, without strain taking into account the expansions of glass. A typical example is by retaining the glazing with the help of self tapping screws and aluminium angle retainer of dimensions 25mmx25mmx1.5mm fixed on the top of the box it shall be ensured that the screws are not touching the glass edge. Top surface along the edge between the glass and the aluminium angle shall be caulked with suitable sealants such as zinc oxide based/rubber based/silicon rubber based or polysulphide rubber sealants. 10. GASKET FOR FLANGES 3 mm thick gasket of Neoprene/synthetic rubber gasket shall be used for sealing the joints between flanges. 11. COLLECTOR SUPPORT FRAME The structure should be in a position of withstand a wind velocity of 150 kms/hr. shall be made with angle iron of 35 mmx35mmx4mm; will have vertical support at top and bottom edge of the inclined plane of the collector at a distance of 1.5 M or less. The vertical support shall be firmly grouted with the roof. The non corrosive material or have corrosion resistant protective coating must be used. They will be strong enough to sustain their pressure during the lifetime of system. 12. PAINTING OF STANDS Proper cleaning and degreasing of the surface should be done with the help of three in one solution before painting. Two coats of zinc chromate red oxide primer shall be applied followed by two coats of enamel paint of suitable colour as per NIT. 13.STORAGE TANK(HOT WATER) a)material b) Thickness SS 304 or 316 grade min/ MS or any other material with anticorrosive coating for hard water with chlorine contents. Minimum thickness Tank capacity 15

16 20 gauge 20 gauge 20 gauge 18 gauge 18 gauge 18 gauge 16 gauge 14 gauge 14 gauge (0.91mm)for 100 lpd (0.91mm) for 200 lpd (0.91mm)for 500 lpd (1.2mm)for 1000lpd (1.2mm)for 1500 lpd (1.5mm)for 2000 lpd (1.6mm)for 3000 lpd (2.0mm) for 4000 lpd (2.0mm)for 5000 lpd For MS minimum thickness will be 1.5 mm. c) Insulation and installation Minimum 50mm thick with CFC free PUF having density of kg per Cu.mtr. For regions with sub zero temperatures, it will be doubled. 24 SWG thick aluminium sheet shall be used for cladding the tank insulation. The storage tank shall be properly installed at site using enameled coated appropriate size angle iron stands, girder, cement concrete pedestals of 1:2:3 ratio or any other specific provision suitable to site to ensure the stability against heavy storm etc. but not less than 1 x1 x6 dimensions. (d). Welding External of the tank should be properly insulated so that hot water temperature does not decrease by more than 5 deg. C in about 16 hrs. Time. TIG/Seam/ pressurized weld (Open arc weld not permitted) 14. PIPING Material Insulation 1 to 2 dia Medium class (B class) GI as per IS 1239 shall be used for piping. Minimum 50mm thick with CFC free PUF having density of kg per Cu.mtr. For regions with sub zero temperatures, it will be doubled. 26 SWG thick aluminium sheet shall be used for cladding the insulated pipe. The pipe line should be properly supported and fixed with clamp with the help of suitable size stand/civil structure (cement concrete ratio 1:4) ISI mark strainer of standard make should be fitted in the main cold water supply line before the system/ 15.VALVES/NIPPLE/TEES/BENDS Gun metal valve ISI marked shall be used. Nipple/tees and bends of ISI marked of medium class GI (B class) shall be used. Air vents in each row are to be provided. 16. INSTRUMENTATION Temperature gauge: 1 No. dial type (for Hot Water Storage Tank/Outlet) Gun metal stainer: 1 No. (at Cold Water inlet) 16

17 Water meter -1 at the inlet of cold water tank. Maximum 2 nos. of chrome plated brass taps for systems upto 200 lpd and thereafter 1 tap per 200 lpd of superior quality for distribution line. (ISI mark or standard make. 17. COLD WATER TANK HDPE/LDPE material with Gun metal float valve (ISI marked) equal to the capacity of Hot water storage tank. 18. MAKE UP TANK The capacity of makeup tank should be 5 litres up to 500 lpd and 10 litres for 1000 lpd and above made of SS304 minimum 0.8 mm thick. (ISI mark or standard make. 19. STANDS & PEDESTALS FOR THE TANKS (hot water tank/ cold water tank) The tanks will be mounted on stands made out of angle iron frame of 35x35x4mm up to 500 liters, 50x50x6 mm up to 2000lpd and 65x65x6mm for capacity above 2000 liters with each leg duly grouted with PCC 1:2:4 of 1 x1 x1 size. The cold water tanks will be placed over angle iron frame having 4 cross members in 4 legs with 5mm thick MS sheet for full bottom support fixed of 4 horizontal members based on the size of the cold water tanks. The non corrosive material or have corrosion resistant protective coating must be used. They will be strong enough to sustain their pressure during the lifetime of system. 20. SYSTEM LAYOUT & DESIGN Maximum number of collectors in series should not be more than ten. Maximum number of collectors in parallel in one row without the use of any piping connections should not be more than six. Air venting at appropriate places without hindrance of a spring leaded valve to prevent air locking in the system should be provided. For this purpose, the system shall have, at a suitable point, atmospheric pressure conditions preferably in the high temperature zone. System shall have a suitable expansion/make up tank at a high point in the system to ensure that collectors run full all the times. Capacity of this expansion/make up tank should be 1.5% of the system capacity for all systems. 21. PUMP In case of forced system, pump of suitable size with DTC/FTC control has to be provided as per site requirements. 22. HEAT EXCHANGER (ISI mark or standard make. (a) Shell-in-Tube Type (i) Material Copper for forced systems only. Shell in tube type heat exchanger may be used if U- type construction is not employed and if V-type construction is employed, then minimum 4 Nos. of heat exchangers will be used in series. 17

18 (ii) Tube Thickness Shell shall be designed for 1.5 times of the designed operating pressure and shall be tested for two times the operating pressure. In case of mild steel shell, corrosion allowance of 1.6 mm shall be provided. Shell shall be designed as per the BIS All the elements of heat exchanger shall be as per relevant Indian Standard or as per TEMA Class C construction. Minimum 22 SWG, but may be higher depending upon the designed pressure requirements. For thermosyphen systems only. May be used by incorporating Cu/SS coils/retender inside the storage tank Copper/SS tube of ¾ dia (b) Coil-type Heat Exchanger (i) Material (ii) Thickness (iii) No. of coils and flow Pattern 23. ELECTRICAL BACK UP Minimum 22 SWG. May be higher depending upon the pressure requirements. Shall be so designed to ensure the pressure drop less than 0.3 kg/cm. The surface area of the heat exchanger should not be less than 0.24 m 2 per sq.m of the absorber area of the system (for 100 lpd system, the copper tube length of 7 meter is required). For 100 lpd - 2 KW For 200 lpd- 2 KW For 300 lpd- 2x2 KW For 400 lpd- 2x2 KW For 500 lpd- 2x2 KW Electrical wiring of 2:5 mm sq. 2 core unarmoured cable, thermostat of Radssion /Bajaj Make with MCB of 16 amp. For 600 lpd- 6 KW For 800 lpd-9 KW For 1000 lpd-9 KW For above 1000 lpd-@ 9 KW per 1000 lpd Electrical back up control panel for 6 KW 1. DP switches 20 Amp. 2. Thermostat for auto cut Electrical back-up control panel for 9 KW 1. DP switches 1x32 Amp. 2. Thermostat for auto cut Anchor make or equivalent ABB/Sieman/Havel/ ISI MARKED Anchor make or equivalent ABB/Sieman/Havel/ ISI MARKED Wire should be of not less than 2.5 mm2 or 4mm2, Cu, armoured type 18

19 General Requirements i) System will be well grouted with collectors installed atleast 6 above the ground. It should be able to sustain the wind speed of 150 km per hour. ii) All the collectors will be south facing inclined at suitable angle to give best performance in winter iii) There will not be any shadow falling on the collectors from nearby structures or of other collectors in front or back row iv) Hot water pipe lines of any kind in colder regions will be fully insulated from the point of drawl of water from tank to delivery points. At no place, these will be left without insulation. In other regions also care will be taken to avoid heat losses from pipelines. v) System will be installed nearest to the point of hot water usage to avoid longer pipeline & higher heat losses. vi) The workmanship & aesthetics of the system will be good and it should be visible to anybody vii) Air vent pipe, make up water and cold water tanks will be installed as required for smooth functioning of the system viii) There won t be any leakage observed in the system from tanks/ collectors/ pipelines ix) Electric back up for systems above 100 lpd capacity will be provided through instant geyzer or through electric geyser already installed at usage places especially where storage capacity of geyser is less than 10 liter. This will avoid heating whole amount of water in storage tank and waiting time of heating if requirement of hot water is small. x) The FPC based systems will be from BIS approved manufacturers of flat plate collector (2 sq. m. absorber area for 100 liter tank capacity system). An undertaking will be given by the manufacturer/supplier confirming to above requirements. In case any manufacturer/supplier is found not sticking to above requirements, his name will be removed from MNRE/HAREDA list. Note: All salient featurers of the system including those mentioned above will be highlighted on a plate fixed on front surface of the tank alongwith name of manufacturer/ dealer & his contact No. 19

20 Annexure-II MINIMUM TECHNICAL SPECIFICATIONS OF VARIOUS COMPONENTS OF ETC BASED SOLAR WATER HEATING SYSTEMS. Evacuated Tube Collectors/ Heat pipes Type of tubes No. of tubes in a system Procurement : 3 layer solar selective (Inner layer of copper coating should be visible). Detailed specifications of tubes will be as per the guidelines laid down by MNRE for empanelment of Manufacturers of ETC based systems & made available at MNRE website (MNRE approved manufacturers/suppliers). : To have minimum 1 ½ sq. m. of absorber area for 100 liter tank capacity system. Absorber area will be calculated as Number of tubes X (exposed surface area of tube in meters i.e x radius of tube). For example 14 tubes of ID: 47 mm & length: 1500 mm and 10 tubes of ID 58 mm & length: 1800 mm will be required for each 100 lpd system. : From reputed supplier (Details of supplier to be provided) Storage Tanks, Piping, Support structure etc (To be all indigenous & not imported) Inner tank material Inner tank thickness Inner tank welding Storage tank capacity Thermal insulation of tanks & hot water piping Outer clading & Frames Valves, cold water tank, vent pipe, heat exchanger, make up tank & measuring instruments : SS 304 or 316 grade min/ MS or any other material with anticorrosive coating for hard water with chlorine contents. : For SS minimum thickness will be 0.5 mm when using argon arc or metal inert gas for welding and 0.8 mm when using other type of weldng. For MS minimum thickness will be 1.5 mm. No leakage under any kind of negative or positive pressure od water will be ensured. : TIG / Seam/ pressurized weld (Open arc weld not permitted) : Not less than system capacity. In case of ETC based system, volume of tubes & manifold not to be included in tank capacity. : Minimum 50mm thick with CFC free PUF having density of kg per Cu.mtr. For regions with sub zero temperatures, it will be doubled. : Al/SS/FRP or GI powder coated. MS may also be used with special anti-corrosive protective coatings. : Of ISI mark or standard make 20

21 Support structure for Collectors, pipng, tanks etc. : Of non corrosive material or have corrosion resistant protective coating. They will be strong enough to sustain their pressure during the lifetime of system. General Requirements i) System will be well grouted with collectors installed atleast 6 above the ground. It should be able to sustain the wind speed of 150 km per hour. ii) All the collectors will be south facing inclined at suitable angle to give best performance in winter iii) There will not be any shadow falling on the collectors from nearby structures or of other collectors in front or back row iv) Hot water pipe lines of any kind in colder regions will be fully insulated from the point of drawl of water from tank to delivery points. At no place, these will be left without insulation. In other regions also care will be taken to avoid heat losses from pipelines. v) System will be installed nearest to the point of hot water usage to avoid longer pipeline & higher heat losses. vi) The workmanship & aesthetics of the system will be good and it should be visible to anybody vii) Air vent pipe, make up water and cold water tanks will be installed as required for smooth functioning of the system viii) There won t be any leakage observed in the system from tanks/ collectors/ pipelines ix) Electric back up for systems above 100 lpd capacity will be provided through instant geyzer or through electric geyser already installed at usage places especially where storage capacity of geyser is less than 10 liter. This will avoid heating whole amount of water in storage tank and waiting time of heating if requirement of hot water is small. An undertaking will be given by the manufacturer/supplier confirming to above requirements. In case any manufacturer/supplier is found not sticking to above requirements, his name will be removed from MNRE/HAREDA list. Note: All salient featurers of the system including those mentioned above will be highlighted on a plate fixed on front surface of the tank alongwith name of manufacturer/ dealer & his contact No. 21