Dutch code of practice. NPR 7976+C1 (en)

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1 Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Dutch code of practice NPR 7976+C1 (en) Determination of the thermal performance of factory made solar domestic hot water systems - Conversion procedure based on the Dutch reference conditions Bepaling van de energetische opbrengst van zonneboilers voor huishoudelijk gebruik - Omrekenprocedure op basis van de Nederlandse referentie-omstandigheden Supersedes NPR 7976:2009 ICS august 2010

2 Normcommissie "Zonne-energie" Apart from exceptions provided by the law, nothing from this publication may be duplicated and/or published by means of photocopy, microfilm, storage in computer files or otherwise, which also applies to full or partial processing, without the written consent of the Netherlands Standardization Institute. The Netherlands Standardization Institute shall, with the exclusion of any other beneficiary, collect payments owed by third parties for duplication and/or act in and out of law, where this authority is not transferred or falls by right to the Reproduction Rights Foundation. Auteursrecht voorbehouden. Behoudens uitzondering door de wet gesteld mag zonder schriftelijke toestemming van het Nederlands Normalisatie-instituut niets uit deze uitgave worden verveelvoudigd en/of openbaar gemaakt door middel van fotokopie, microfilm, opslag in computerbestanden of anderszins, hetgeen ook van toepassing is op gehele of gedeeltelijke bewerking. Het Nederlands Normalisatie-instituut is met uitsluiting van ieder ander gerechtigd de door derden verschuldigde vergoedingen voor verveelvoudiging te innen en/of daartoe in en buiten rechte op te treden, voor zover deze bevoegdheid niet is overgedragen c.q. rechtens toekomt aan de Stichting Reprorecht. Although the utmost care has been taken with this publication, errors and omissions cannot be entirely excluded. The Netherlands Standardization Institute and/or the members of the committees therefore accept no liability, not even for direct or indirect damage, occurring due to or in relation with the application of publications issued by the Netherlands Standardization Institute. Hoewel bij deze uitgave de uiterste zorg is nagestreefd, kunnen fouten en onvolledigheden niet geheel worden uitgesloten. Het Nederlands Normalisatie-instituut en/of de leden van de commissies aanvaarden derhalve geen enkele aansprakelijkheid, ook niet voor directe of indirecte schade, ontstaan door of verband houdend met toepassing van door het Nederlands Normalisatie-instituut gepubliceerde uitgaven Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) , Fax (015)

3 Contents Foreword Scope References Terms and definitions Symbols and abbreviations Symbols Abbreviations Requirements Procedure for calculation of the thermal performance of SDHW systems Dutch reference conditions Calculating annual net energy savings Performance members of a product family Estimation of thermal performance of larger thermal solar systems Reporting...8 Annex A Dutch reference conditions...9 Annex B The Dutch procedure for presentation of the thermal performance of the tested SDHW system...13 Annex С Extrapolation method for sub types of a product family...17 Annex D Estimation of thermal performance of larger thermal solar system...24 Annex E Thermal performance presentation sheet...26 Bibliography

4 Foreword The European Standard NEN-EN 12976:series Factory Made Systems, deals with quality and safety aspects of factory made - Solar Domestic Hot Water (SDHW) systems. This standard refers to ISO Components and system testing group (CSTG) method and ISO Dynamic System Test (DST) method,, with respect to thermal performance characterization. In the series Dutch codes of practices are issued of informative nature, like clarifications of standards, constructive solutions, working methods or manufacturing specifications. No normative status shall be assigned to these publications. 2

5 Determination of the thermal performance of factory made solar domestic hot water systems Conversion procedure based on the Dutch reference conditions 1 Scope This code of practice describes the adopted Dutch reference conditions for solar domestic hot water systems. With the results obtained from the ISO (DST) test one can predict its yearly thermal performance for any draw off and climate. A set of reference conditions is defined to be used for the prediction of the yearly thermal performance for the typical Dutch region. the definition of the typical performance parameters used in the Netherlands. The definition of the parameters, the calculation procedure and additional references are given. The set of parameters is based on one main parameter, Q sav in order to make the different SDHW systems comparable. a method to establish the yearly energetic performance for members of a product family. A product family is a series of types differing only in tank volume and collector area. Under strict conditions one type of the product family can be tested, while the other types of the series are estimated based on the test results. the estimation of thermal performance of larger thermal solar systems. 2 References The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NEN 5060: 2008 Hygrothermische eigenschappen van gebouwen; Referentieklimaatgegevens NEN-EN Thermal solar systems and components Solar collectors Part 2:Test methods NEN-EN Thermal solar systems and components Factory made systems Part 1: General requirements NEN-EN Thermal solar systems and components Factory made systems Part 2: Test methods NEN-EN Thermal solar systems and components Custom built systems Part 3: Performance test methods for solar water heater stores NEN-EN NEN-ISO Heating systems in buildings Method for calculation of system energy requirements and system efficiencies Part 4-3: Space heating generation systems, thermal solar systems Solar heating Domestic water heating systems Part 5: System performance characterization by means of whole-system tests and computer simulation 3

6 ISO NEN-EN-ISO 9488 Solar heating Domestic water heating systems Part 2: Outdoor test methods for system performance characterization and yearly performance prediction of solar-energy systems Solar Energy Vocabulary 3 Terms and definitions For the purposes of this code of practice, the following definitions apply. 3.1 auxiliary energy non-solar thermal energy needed to heat the water to the desired hot water temperature 3.2 CSTG test method test method for the determination of the thermal performance of factory made systems according to ISO DST method test method for the determination of the thermal performance of factory made systems according to ISO energy savings reduction of energy use caused by the SDHW system compared to a similar non-solar hot water system 3.5 ICS system solar heating system in which the solar collector also functions as a heat (water) storage device [NEN-EN-ISO 9488] 3.6 solar combi system systems delivering energy to both domestic hot water and space heating 3.7 power average power P measured in J/s (J/s = W) 3.8 solar contribution energy from the solar part of the SDHW system 3.9 solar preheat system solar heating system to preheat water or air prior to its entry into any other type of water or air heater [NEN-EN-ISO 9488] 3.10 solar-plus-supplementary system solar heating system which utilizes both solar and auxiliary energy sources in an integrated way and is able to provide a specified heating service independent of solar energy availability [NEN-EN-ISO 9488] 4

7 3.11 total external energy non-solar thermal energy needed to heat the water to the desired hot water temperature and to make the SDHW system operate correctly 4 Symbols and abbreviations 4.1 Symbols Symbol Description Unit A Collector area m 2 A test Collector area of the tested SDHW system m 2 A sub,i Collector area of the sub type i of a SDHW product family m 2 F nom Ratio store volume and collector area (solar part of the store) F nom,test F nom of the tested SDHW system F nom,sub,i F nom of the sub type i of the tested SDHW system F bu Ratio store volume and collector area (auxiliary part of the store) F bu,test F bu of the tested SDHW system F bu,sub,i F bu of the sub type i tested SDHW system P aux Heating power of the auxiliary heater W P par,op Electrical power of a collector pump W P par,ctrl Electrical power of a collector pump control W Q aux Annual auxiliary energy MJ Q aux.ref Annual heat consumption of the reference non-solar hot water system MJ Q aux,loss Annual heat losses of the reference non-solar hot water system MJ Q aux,net Net auxiliary energy demand delivered by the auxiliary heater to the store or directly to the distribution system (NEN-EN ) MJ Q D (Daily or annual) heat demanded by the user J Q ext Annual total external energy MJ Q L Energy delivered at the outlet of the solar heating system (NEN-EN ) MJ Q par Annual parasitic energy MJ Q sav Annual energy savings MJ Q w,sol,out,an Q w,sol,out,m Annual heat delivered by the thermal solar system according to NEN-EN , method B Monthly heat delivered by the thermal solar system according to NEN-EN , method B kwh kwh Q w,sol,out,dst,test Q w,sol,out from the system test report kwh 5

8 Q w,sol,out,en,test Q w,sol,out from the tested system recalculated according to NEN-EN , method B kwh t op Operation time of the collector pump s T CA / θe,avg Outdoor ambient air temperature C T a Temperature of the air surrounding the heat store C T set point The set point temperature of the auxiliary heater C T cold / θ cw T warm Cold water temperature Hot water temperature / distribution temperature o C o C T SA Indoor ambient air temperature C UA-value Store insulation W/K V Volume l V aux Auxiliary part of the heat store l V load,day Daily hot water demand l/day 4.2 Abbreviations CSTG DST ICS system Components and system testing group Dynamic system test SDHW system with integrated collector and store SDHW system Solar domestic hot water system 5 Requirements In order to determine the thermal performance of a factory made SDHW system according to this technical report, the SDHW system should be tested in accordance with ISO as referred to by NEN-EN NOTE The DST method is allowed for preheat systems. 6 Procedure for calculation of the thermal performance of SDHW systems 6.1 Dutch reference conditions In Annex A the references are presented for the climate, the hot water consumption and the definition of the hot water installation. Using these references the thermal performance of the SDHW systems are comparable and suited to the typical Dutch situation. 6.2 Calculating annual net energy savings The thermal performance of a tested SDHW system for Dutch reference conditions should be calculated by executing the procedure described in Table 1. 6

9 Table 1 Five step procedure for calculating the annual net energy savings of a tested SDHW system Preheat SDHW systems Solar plus supplementary SDHW systems Prior to 1 Determine the parameters of the SDHW system according to ISO (DST) as referred to by NEN-EN Calculate Q L for the Dutch reference conditions given in Annex A Calculate Q aux,net for the Dutch reference conditions given in Annex A 2 Calculate Q aux according to formula (B.1) Calculate Q aux according to formula (B.2) 3 Determine Q par according to formula (B.7) 4 Calculate Q ext according to formula (B.3) 5 Calculate Q sav according to formula (B.8). Q aux,ref is calculated according to formula (A.1). A solar combi system can be seen as a solar domestic hot water system under the following conditions: a) the total collector (aperture) does not exceed 5 m 2 ; b) the space heating function is disabled; c) an independent thermal solar expert with proven qualifications in the field of thermal solar energy systems motivates and declares that the system in a combined space heating and water heating function will not perform worse than in the water heater function within reasonable certainty; d) the report stated explicitly clear that the performance figures are only valid for a SDHW function only. 6.3 Performance members of a product family If the manufacturer produces several versions of the same system, differing only in storage tank volume and / or different collector area, these different system configurations are considered the same type (within the same system product family). The different configurations of the system are called sub types. The performance of the sub types can be estimated according to the following procedure: 1) Check for a pass / fail with the criteria for a sub type according to Annex C.1. 2) Check for a pass / fail with the criteria for the allowed range of different dimensions of the main components according to Annex C.2. 3) Calculations with the tested system according to Annex C.5, resulting in F dev. 4) Check for a pass / fail with the criterion for the applicability of the method according to Annex C.6. 5) Calculate the performance of a sub type The procedure should be followed for each sub type and hot water load. 7

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