1、BSI Standards PublicationBS EN ISO 17628:2015Geotechnical investigationand testing Geothermaltesting Determination ofthermal conductivity of soiland rock using a borehole heatexchangerBS EN ISO 17628:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 17628
2、:2015.This document sets a standard for “geothermal testing”. It describes both the installation of closed loop ground heat exchanger boreholes, and the process to be adopted for “Thermal Response Testing” (TRT) on a closed loop borehole. Readers should be aware that there are other standards that d
3、escribe the drilling and installation of closed loop borehole heat exchangers. The “geothermal testing” described in this standard should not be confused with other conventional geothermal testing, or with open loop borehole testing. In the opinion of the UK committee, there is a lack of clarity reg
4、arding test results vs test data. The reader should appreciate that the outcome of a successful TRT will deliver thermal conductivity, ground equilibrium temperature and borehole thermal resistance, not just thermal conductivity as implied by the title. The standard describes drilling rigs and drill
5、ing methods, which are of interest but are not related to the TRT procedure. Note that the standard is applicable to boreholes of up to 400m depth, but there is no reference to the additional care and attention that needs to be paid to hydrostatic pressure control during the installation of borehole
6、 heat exchangers to this depth. Readers should make themselves aware of these requirements separately. There are references in the document to multiple boreholes, when a TRT will in general only be carried out on a previously installed closed loop borehole. A prescriptive method of flow and pressure
7、 testing is provided, which is dealt with in other standards and is not of overriding consideration in the performance of a TRT. Grout and grouting are referenced, which is routinely required in the UK, but there is no mention of a minimum requirement for the hydraulic permeability of the grout. Thi
8、s parameter is the overriding requirement as far as the UK environmental authorities are concerned, in order to provide the required level of hydraulic sealing. The standard does not provide information on the accuracy requirements of the flow and return temperature measurements. These are critical
9、to the final accuracy that can be obtained from the analysis of the temperature data and the user is advised to pay attention to this. The reader should make themselves aware of precisely which temperatures are to be measured and where. The test rig and associated connections to the borehole heat ex
10、changer need to be adequately insulated from the impact of ambient temperatures. The reader should ensure that the delivered energy is measured to the required accuracy, and that the active depth of the heat exchanger is accurately recorded. The standard has a limited description of how the ground e
11、quilibrium temperature is to be measured, and a rudimentary description of how to obtain temperature depth profiles. The “temperature graph” that is referred to is constructed by computing the average of the measured flow and return temperatures, and plotting this as the temperature difference from
12、the ground equilibrium temperature against logarithmic time from the start of the test. Any analysis needs to reflect the use of natural log or log 10 on this graph. The standard does not deal with how variable power can be dealt with, or what should happen if power or flow is lost during the test.
13、The UK committee regard the recording of data related to the test, in Annex B, B1 and B4 to be unhelpful. BS EN ISO 17628:2015BRITISH STANDARDFor further clarification, it is recommended that UK users should also refer to:Closed-loop Vertical Borehole Design, Installation 93.020Compliance with a Bri
14、tish Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2015.Amendments/corrigenda issued since publicationDate Text affectedThis page deliberately left blankEUROPEAN STANDARD NORM
15、E EUROPENNE EUROPISCHE NORM EN ISO 17628 July 2015 ICS 93.020; 13.080.20 English Version Geotechnical investigation and testing - Geothermal testing - Determination of thermal conductivity of soil and rock using a borehole heat exchanger (ISO 17628:2015) Reconnaissance et essais gotechniques - Essai
16、s gothermiques - Dtermination de la conductivit thermique des sols et des roches dans les sondes gothermiques (ISO 17628:2015) Geotechnische Erkundung und Untersuchung - Geothermische Versuche - Bestimmung der Wrmeleitfhigkeit von Boden und Fels unter Anwendung von Erdwrmesonden (ISO 17628:2015) Thi
17、s European Standard was approved by CEN on 23 April 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical referenc
18、es concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN me
19、mber into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, F
20、rance, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES
21、 KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 17628:2015 EBS EN ISO 17628:2015EN ISO 17628:2015 (E) 3 European foreword This document (
22、EN ISO 17628:2015) has been prepared by Technical Committee CEN/TC 341 “Geotechnical Investigation and Testing”, the secretariat of which is held by BSI, in collaboration with Technical Committee ISO/TC 182 “Geotechnics“. This European Standard shall be given the status of a national standard, eithe
23、r by publication of an identical text or by endorsement, at the latest by January 2016, and conflicting national standards shall be withdrawn at the latest by January 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/o
24、r CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
25、Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
26、Endorsement notice The text of ISO 17628:2015 has been approved by CEN as EN ISO 17628:2015 without any modification. BS EN ISO 17628:2015ISO 17628:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and abbreviations . 35 Installation of borehole heat exchanger
27、s . 45.1 Drilling rigs and ancillary equipment . 45.1.1 General 45.1.2 Requirements for the drilling rigs and equipment . 45.2 Borehole heat exchangers, filling, and annular space filling materials 55.2.1 Borehole heat exchanger material 55.2.2 Heat transfer fluid of the borehole heat exchanger tube
28、s 55.2.3 Annular space filling material 55.3 General requirements prior to installation 65.3.1 Requirements on the drilling and installation site . 65.3.2 Selection of drilling techniques and installation methods 65.3.3 Preliminary information needed before starting drilling and installation 65.3.4
29、Environmental requirements . 75.3.5 Safety requirements 75.4 Execution 75.4.1 Drilling 75.4.2 Installation of borehole heat exchangers . 85.4.3 Annular space filling . 85.4.4 Functional testing . 95.4.5 Site reinstatement 126 Geothermal response testing .126.1 General 126.2 Test equipment 136.3 Test
30、 procedure 136.4 Test results. 156.5 Evaluation of the test results . 157 Report .167.1 Field report . 167.1.1 Record of the installation of the heat exchanger tubes .177.1.2 Annular space filling record 177.1.3 Checking record .187.1.4 Record of measured values and test results 187.1.5 Record of ev
31、aluated test results . 187.2 Report of the results 18Annex A (informative) Example of a form for the preliminary information on the intended installation of heat exchanger .20Annex B (informative) Field reports 22Annex C (informative) Example of the graphical presentation of the installed borehole h
32、eat exchanger and the geology along the borehole .27Bibliography .28 ISO 2015 All rights reserved iiiContents PageBS EN ISO 17628:2015ISO 17628:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work
33、 of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmen
34、tal, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the
35、ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibi
36、lity that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of p
37、atent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as inf
38、ormation about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationISO 17628 was prepared by European Committee for Standardization (CEN) Technical Committee CEN/TC 341, Geotechnical investigation and testing, in co
39、llaboration with ISO Technical Committee ISO/TC 182, Geotechnics, Subcommittee SC 1, in accordance with the agreement on technical cooperation between ISO and CEN (Vienna Agreement).iv ISO 2015 All rights reservedBS EN ISO 17628:2015INTERNATIONAL STANDARD ISO 17628:2015(E)Geotechnical investigation
40、and testing Geothermal testing Determination of thermal conductivity of soil and rock using a borehole heat exchanger1 ScopeThis International Standard specifies requirements for the Geothermal Response Test (GRT). This test comprises the in situ determination of the thermal conductivity in saturate
41、d and unsaturated soil and rock in a heat exchanger installed in a borehole. For this test, liquid heat transfer media not subjected to phase changes are used.The thermal conductivity is an important parameter used in the design of thermal storage and thermal exchange systems.A Geothermal Response T
42、est measures the temperature response to a thermal energy forcing of a borehole heat exchanger (BHE) or the extraction of thermal energy from a borehole. The temperature response is related to the thermal parameters of the ground and borehole filling material, such as thermal conductivity and boreho
43、le resistivity, and is therefore used to obtain estimated or derived values of these parameters.This International Standard applies to heat exchangers installed in vertical or inclined boreholes with length up to e.g. 400 m and with a diameter of up to 200 mm.2 Normative referencesThe following docu
44、ments, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 14688-1, Geotechnical
45、investigation and testing Identification and classification of soil Part 1: Identification and descriptionISO 14689-1, Geotechnical investigation and testing Identification and classification of rock Part 1: Identification and descriptionISO 22475-1, Geotechnical investigation and testing Sampling m
46、ethods and groundwater measurements Part 1: Technical principles for executionEN 16228-1, Drilling and foundation equipment - Safety - Part 1: Common requirementsEN 16228-2, Drilling and foundation equipment - Safety - Part 2: Mobile drill rigs for civil and geotechnical engineering, quarrying and m
47、ining3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 22475-1 and the following apply.3.1borehole heat exchangerBHEone or two U-tubes or one coaxial tube in a borehole through which the exchanger fluid circulatesNote 1 to entry: See Figure 1 and Figure
48、 2. ISO 2015 All rights reserved 1BS EN ISO 17628:2015ISO 17628:2015(E)Brrrss 01FEa) single U-tubeBEFsrrr0s1b) double U-tube c) coaxial tubeKeyr1borehole radius Fthermal conductivity of the annular space fillingriinner radius wthermal conductivity of the inner borehole tuberaouter radius sthermal co
49、nductivity of the outer borehole tuberoinner radius of the outer tube Ethermal conductivity of the groundrsouter radius of the outer tube B tube spacingFigure 1 Cross-section of examples of borehole heat exchanger tubes2 ISO 2015 All rights reservedBS EN ISO 17628:2015ISO 17628:2015(E)123645Key1 heat exchanger outlet2 heat exchanger inlet3 borehole wall4 annular space filling5 connection6 ground levelFigure 2 Example of a borehole heat exchanger including annular space filling3.2geothermal response testtest to obtain the thermal cond
