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 isB lack of clarity rega
4、rding 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 drilli
5、ng 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. This
8、 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 t
9、o 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 exc
10、hanger 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 eq
11、uilibrium 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 t
12、he 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. T
13、he 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 Brit
14、ish 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 NORME
15、 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 - Essais
16、 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) This
17、 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 reference
18、s 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 mem
19、ber 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, Fr
20、ance, 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 (E
22、N 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, either
23、 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/or
24、 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 R
25、epublic, 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. E
26、ndorsement 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 1u .14 Symbols and abbreviations .35 Installation of borehole heat exchangers .4ws .45.1.1 General45.1
27、.2 Requirements for the drilling rigs and equipment .4wt 55.2.1 Borehole heat exchanger material 5wtt 5wtu 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 6wuu 65.3.4 Environme
28、ntal requirements .7wuw 75.4 Execution75.4.1 Drilling 75.4.2 Installation of borehole heat exchangers .8wvu .85.4.4 Functional testing .95.4.5 Site reinstatement 126 Geothermal response testing .126.1 General 126.2 Test equipment 136.3 Test procedure 136.4 Test results.156.5 Evaluation of the test r
29、esults .157 Report .167.1 Field report .167.1.1 Record of the installation of the heat exchanger tubes .17yst 177.1.3 Checking record .187.1.4 Record of measured values and test results 187.1.5 Record of evaluated test results .187.2 Report of the results 18Annex A (informative) Example of a form fo
30、r 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 heat exchanger and the geology along the borehole .27Bibliography .28 ISO 2015 All rights reserv
31、ed iiiContents PageBS EN ISO 17628:2015ISO 17628:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards committee has been established has the right to be represented on that committee. International organizations, governmental and non
32、-governmental, in liaison with ISO, also take part in the work. electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the e
33、ditorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). the ISO list of patent declarations received (see www.iso.org/patents). constitute an endorsement. assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see
34、 the following URL: syxtz CEN/TC 341, Geotechnical investigation and testing, in collaboration 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 reserved BS EN ISO 17628:2015INTERNATIONAL STANDARD ISO 17628:2015(E)Geotechnical investigation and testing Geothermal testing Determination of thermal conductivity of soil and rock using a borehole heat exchanger1 Scope comprises the in situ phase changes are used.
