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

NPR 7976+C1 (en)

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Determination of the thermal performance of factory made solar domestic hot water systems Conversion procedure based on the Dutch reference conditions

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Bepaling van de energetische opbrengst van zonneboilers voor huishoudelijk gebruik Omrekenprocedure op basis van de Nederlandse referentie-omstandigheden

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Dutch code of practice

Supersedes NPR 7976:2009

ICS 27.160 august 2010

Dit document is een voorbeeld van NEN / This document is a preview by NEN

NPR 7976+C1:2010

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Normcommissie 349 010 "Zonne-energie"

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.

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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.

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.

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. ©2010 Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) 2 690 390, Fax (015) 2 690 190


NPR 7976+C1:2010

Contents Foreword ...........................................................................................................................................................2 Scope................................................................................................................................................3

2

References .......................................................................................................................................3

3

Terms and definitions.....................................................................................................................4

4 4.1 4.2

Symbols and abbreviations ...........................................................................................................5 Symbols.............................................................................................................................................5 Abbreviations.....................................................................................................................................6

5

Requirements ..................................................................................................................................6

6 6.1 6.2 6.3 6.4

Procedure for calculation of the thermal performance of SDHW systems ...............................6 Dutch reference conditions ...............................................................................................................6 Calculating annual net energy savings .............................................................................................6 Performance members of a product family .......................................................................................7 Estimation of thermal performance of larger thermal solar systems.................................................8

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Reporting .........................................................................................................................................8

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Annex A Dutch reference conditions .............................................................................................................9

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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

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Bibliography....................................................................................................................................................28

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NPR 7976+C1:2010

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 9459-2 Components and system testing group (CSTG) method and ISO 9459-5 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.

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NPR 7976+C1:2010

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.

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With the results obtained from the ISO 9459-5 (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, Qsav in order to make the different SDHW systems comparable.

— a method to establish the yearly energetic performance for members of a product family.

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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.

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2 References

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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. Hygrothermische eigenschappen van gebouwen; Referentieklimaatgegevens

NEN-EN 12975-2

Thermal solar systems and components – Solar collectors – Part 2:Test methods

NEN-EN 12976-1

Thermal solar systems and components – Factory made systems – Part 1: General requirements

NEN-EN 12976-2

Thermal solar systems and components – Factory made systems – Part 2: Test methods

NEN-EN 12977-3

Thermal solar systems and components – Custom built systems – Part 3: Performance test methods for solar water heater stores

NEN-EN 15316-4-3

Heating systems in buildings – Method for calculation of system energy requirements and system efficiencies – Part 4-3: Space heating generation systems, thermal solar systems

NEN-ISO 9459-5

Solar heating – Domestic water heating systems – Part 5: System performance characterization by means of whole-system tests and computer simulation

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NEN 5060: 2008

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NPR 7976+C1:2010 ISO 9459-2

Solar heating – Domestic water heating systems – Part 2: Outdoor test methods for system performance characterization and yearly performance prediction of solar-energy systems

NEN-EN-ISO 9488

Solar Energy Vocabulary

3 Terms and definitions For the purposes of this code of practice, the following definitions apply.

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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 9459-2

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3.3 DST method test method for the determination of the thermal performance of factory made systems according to ISO 9459-5 3.4 energy savings reduction of energy use caused by the SDHW system compared to a similar non-solar hot water system

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[NEN-EN-ISO 9488]

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3.5 ICS system solar heating system in which the solar collector also functions as a heat (water) storage device

3.6 solar combi system systems delivering energy to both domestic hot water and space heating

3.8 solar contribution energy from the solar part of the SDHW system

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3.7 power average power P measured in J/s (J/s = W)

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


NPR 7976+C1:2010 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

Atest

Collector area of the tested SDHW system

m2

Asub,i

Collector area of the sub type i of a SDHW product family

m2

Fnom

Ratio store volume and collector area (solar part of the store)

–

Fnom,test

Fnom of the tested SDHW system

–

Fnom,sub,i

Fnom of the sub type i of the tested SDHW system

–

Fbu

Ratio store volume and collector area (auxiliary part of the store)

–

Fbu of the tested SDHW system

–

Fbu of the sub type i tested SDHW system

–

Heating power of the auxiliary heater

W

Ppar,op

Electrical power of a collector pump

W

Ppar,ctrl

Electrical power of a collector pump control

W

Qaux

Annual auxiliary energy

MJ

Qaux.ref

Annual heat consumption of the reference non-solar hot water system

MJ

Qaux,loss

Annual heat losses of the reference non-solar hot water system

MJ

Qaux,net

Net auxiliary energy demand delivered by the auxiliary heater to the store or directly to the distribution system (NEN-EN 12976-2)

MJ

QD

(Daily or annual) heat demanded by the user

Qext

Annual total external energy

QL

Energy delivered at the outlet of the solar heating system (NEN-EN 12976-2)

MJ

Qpar

Annual parasitic energy

MJ

Qsav

Annual energy savings

Qw,sol,out,an

Annual heat delivered by the thermal solar system according to NEN-EN 15316-4-3, method B

kWh

Qw,sol,out,m

Monthly heat delivered by the thermal solar system according to NEN-EN 15316-4-3, method B

kWh

Qw,sol,out,DST,test

Qw,sol,out from the system test report

kWh

Fbu,test Fbu,sub,i Paux

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m2

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Collector area

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J

MJ

MJ

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NPR 7976+C1:2010

Qw,sol,out,EN,test

Qw,sol,out from the tested system recalculated according to NEN-EN 15316-4-3, method B

kWh

top

Operation time of the collector pump

TCA / θe,avg

Outdoor ambient air temperature

°C

Ta

Temperature of the air surrounding the heat store

°C

Tset point

The set point temperature of the auxiliary heater

°C

Tcold / θcw

Cold water temperature

o

Twarm

Hot water temperature / distribution temperature

o

TSA

Indoor ambient air temperature

°C

UA-value

Store insulation

V

Volume

l

Vaux

Auxiliary part of the heat store

l

Vload,day

Daily hot water demand

s

C

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C

W/K

l/day

CSTG

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4.2 Abbreviations

Components and system testing group

DST

Dynamic system test

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Solar domestic hot water system

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5 Requirements

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SDHW system

SDHW system with integrated collector and store

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ICS system

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 9459-5 as referred to by NEN-EN 12976-2. NOTE

The DST method is allowed for preheat systems.

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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.

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NPR 7976+C1:2010

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 9459-5 (DST) as referred to by NEN-EN 12976

1

Calculate QL for the Dutch reference conditions given in Annex A

Calculate Qaux,net for the Dutch reference conditions given in Annex A

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Calculate Qaux according to formula (B.1)

Calculate Qaux according to formula (B.2)

3

Determine Qpar according to formula (B.7)

4

Calculate Qext according to formula (B.3)

5

Calculate Qsav according to formula (B.8). Qaux,ref is calculated according to formula (A.1).

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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 m2; b) the space heating function is disabled;

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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;

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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

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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 Fdev.

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.

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