Test Report No. C926LPEN
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1 Institut für Solartechnik Hochschule für Technik Rapperswil Oberseestrasse 10, CH 8640 Rapperswil Tel , Fax Ordered by: AMK-Collectra AG Bahnweg Nord 16 CH-9475 Sevelen Tel. +41 (081) Fax: +41 (081) Test Report No. C926LPEN Performance test according to EN :2006, Paragraph 6 Content: page 1 Description of Collector Technical Data of the Sample Sketch of Collector Specifications on Elements Photo of Collector Sketch of Collector Mounting Test Methods and Results Test of Thermal Performance Schematic of the Test Loop Power Output Incident Angle Factor Time Constant Effective Thermal Capacity Pressure Drop Observed Failures Remarks...12 page 1 of 12 pages
2 1 Description of Collector 1.1 Technical Data of the Sample Product information Manufacturer AMK-Collectra AG Model OPC 10 Type Evacuated tube collector Flow Direct flow Serial product Yes A complete set of technical Drawing number drawings is filed at the test institute Serial number Date of manufacture Physical parameters Gross length m Gross width m Gross heigth m Gross area m² Aperture area m² Absorber area m² Weight empty 33.0 kg Fluid capacity 1.4 l Construction Type Number of absorber elements Absorber pitch Number of hydraulically parallel tubes Number of thermally serial glazings Material of glazing(s) Thickness of glazing(s) Evacuated tube collector mm 10 1 Borosilicate glass 1.6 mm Heat transfer fluid (manufacturers recommendation) Type Water-antifreeze Specifications -- Flow range (manufacturers recommendation) Flow range l/h Rated flow rate 45 l/h Absorber Absorber element Evacuated double glass tube Length of absorber element mm Width of absorber element 36.8 mm Thickness of absorber element 1.6 mm Coating Cermet AlN / SS on Al Flowed through element Copper U-pipe Joining technique Heat conducting aluminum sheets Joining seam -- Installation On tilted roof In tilted roof On flat roof On flat roof with stand Facade Yes No No Yes Yes Casing and insulation Casing material Aluminium Sealing material -- Insulation material Glass wool Thickness (in mm) 30 Aperture dimensions m * m Limitations (manufacturer information) Max. temperature Not specified Max. operating pressure 10 bar Other -- Remarks on collector design -- Test schedule Test procedure EN12975:2006, Outdoor test Sample received Start of test End of test page 2 of 12 pages
3 1.2 Sketch of Collector 1.3 Specifications on Elements 1 Glazing Material: Borosilicate glass Thickness [mm]: Vacuum 3 Absorber Absorber element: Evacuated double glass tube Flow-through element: Copper U-pipe Length of element [mm]: 1437 Width of element [mm]: 36.8 Flow type: Parallel 3 Absorber coating Description: 4 Heat-conducting metal sheet Description: 5 U-tube Description: Cermet AlN / SS on Al Aluminum Copper 6 CPC reflector page 3 of 12 pages
4 1.4 Photo of Collector 1.5 Sketch of Collector Mounting page 4 of 12 pages
5 2 Test Methods and Results 2.1 Test of Thermal Performance Tests carried out according to EN : Deviations from this standard are indicated by the same formatting that is used for this clause. The reasons for the deviations are mentioned. 2.2 Schematic of the Test Loop Fig. 2.1: Test loop for efficiency measurements. page 5 of 12 pages
6 2.3 Power Output General Flow rate during test Fluid for tests Test method Geographical position of test site l/h 33.3 Vol-% ethylene glycol stationary (steady state) 47.2 N / 8.8 O, 417 m NN Collector tilt angle tracked (45±5) Collector azimuth angle tracked (0±48) Definition of efficiency η = Q A G Thermal output power of collector Q & Reference area Solar irradiance Solar irradiance on reference area Efficiency equation Temperature at collector inlet Temperature at collector outlet Ambient temperature A G A G η = η T in T ex T a * * 2 0 a1 Tm a2 G Tm Mean collector temperature T = ( T T ) 2 m in + Reduced collector temperature T = ( T T ) G * m m ex a Solar irradiance for efficiency diagrams G = 800 W/m² page 6 of 12 pages
7 2.3.2 Power output per collector unit Peak power Peak power W peak per collector unit for normal incident irradiation of 1000 Wm -2. W peak = 865 [W] Diagram 1000 Power output per collector unit for G = 1000 W/m T m - T a [K] Fig. 2.2: Power output per collector unit at irradiance G = 1000 W/m² Power output per collector unit Global irradiance G T m - T a G=400 W/m² G=700 W/m² G=1000 W/m² 10 K 329 W 589 W 848 W 30 K 294 W 554 W 813 W 50 K 257 W 516 W 776 W page 7 of 12 pages
8 2.3.3 Efficiency curve The efficiency curves with reference to the absorber-, aperture- and gross areas are indicated in addition to the requirements of the norm Collector efficiency for G = 800 W/m 2 Absorber Aperture Gross T m * [Km 2 /W] Fig. 2.3: Efficiency diagram for G = 800 W/m² Parameters for efficiency equation Reference area Absorber area Aperture area Gross area η 0 (-) a 1 (W/m²K) a 2 (W/m²K²) From repetitive measurements of a reference collector, we estimate the following dispersion for the efficiency measurement (standard deviation of the mean, multiplied with a coverage factor 2): At T m *=0.02: 0.27 Efficiency-%, at T m *=0.05: 0.44 Efficiency -%, at T m *=0.08: 0.62 Efficiency -%. page 8 of 12 pages
9 2.4 Incident Angle Factor Table of the Incidence Angle Modifier (IAM) K Θ (longitudinal) K Θ (transversal) Diagram of the Incidence Angle Modifier Incident Angle Modifier IAMT IAML Angle [ ] Fig. 2.4: Incident angle modifiers page 9 of 12 pages
10 2.5 Time Constant τ C = 250 s 2.6 Effective Thermal Capacity Determination according to EN :2006, Annex G.3 Determination based on transient behaviour of the collector. C eff,g3 = 59.9 kj/k (Effective thermal capacity of collector filled with fluid) Additional information: The thermal capacity was measured with the properties of Antifrogen N. For other fluids, the thermal capacity is calculated as follows: C eff,g3 = 1.4 l * density * specific heat capacity of fluid kj/k Determination according to EN :2006, Section Estimation based on material properties. C eff,6162 = 14.4 kj/k (Effective thermal capacity of collector filled with fluid) Additional information: The thermal capacity was measured with the properties of Antifrogen N. For other fluids, the thermal capacity is calculated as follows: C eff,6162 = 1.4 l * density * specific heat capacity of fluid kj/k page 10 of 12 pages
11 2.7 Pressure Drop Diagram 4500 Pressure drop in Pa C Fig. 2.5: Pressure drop as a function of volume flowrate Flowrate [l/h] Pressure drop at rated flowrate Conditions: T m = 20 C and dv/dt = 45 l/h p = 240 Pa Table of pressure drop data in Pa Conditions: T m = 20 C Flow rate [l/h] Pressure drop [Pa] page 11 of 12 pages
12 2.8 Observed Failures Details about failures that are rated as major failures according to paragraph of EN :2006. Absorber leakage or such deformation that permanent contact between absorber and cover is established. Breaking or permanent deformation of cover or cover fixing. Breaking or permanent deformation of collector fixing points or collector box. Loss of vacuum or low pressure (applicable for vacuum or subatmospheric collectors) Accumulation of humidity in form of condensate on the inside of the transparent cover of the collector exceeding 10% of the aperture area Passed Passed Passed Passed Passed No major failures according to paragraph of EN :2006 were found for this collector. 3 Remarks This report must not be copied except in full. The test methods applied fulfil the requirements of EN12975:2006. The test results only refer to the tested collector sample. This test report is made according to the requirements of EN12975:2006. This test report fulfils the requirements of ISO Rapperswil, Dr. Andreas Bohren Head of SPF Testing Dipl.-Ing. Walter Gubler Test engineer page 12 of 12 pages
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