SIST EN 1048:2014

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wärmeaustauscher - Luftgekühlte Flüssigkeitskühler ('Trockenkühltürme') - Prüfverfahren zur LeistungsfeststellungÉchangeurs thermiques - Refroidisseurs de liquide à convection forcée ('aéroréfrigérant sec') - Procédures d’essai pour la détermination de la performanceHeat exchangers - Air cooled liquid coolers ('dry coolers') - Test procedures for establishing performance27.200Hladilna tehnologijaRefrigerating technology27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 1048:2014SIST EN 1048:2014en,fr,de01-november-2014SIST EN 1048:2014SLOVENSKI
STANDARDSIST EN 1048:19991DGRPHãþD



SIST EN 1048:2014



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1048
August 2014 ICS 27.060.30; 27.200 Supersedes EN 1048:1998English Version
Heat exchangers - Air cooled liquid coolers ('dry coolers') - Test procedures for establishing the performance
Echangeurs thermiques - Refroidisseurs de liquide à convection forcée ('aéroréfrigérant sec') - Procédures d'essai pour la détermination de la performance
Wärmeübertrager - Luftgekühlte Flüssigkeitskühler ('Trockenkühltürme') - Prüfverfahren zur Leistungsfeststellung This European Standard was approved by CEN on 22 May 2014.
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 references 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 member 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, France, 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
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1048:2014 ESIST EN 1048:2014



EN 1048:2014 (E) 2 Contents Page Foreword .3 Introduction .4 1 Scope .5 2 Normative references .5 3 Terms and definitions .5 4 Symbols .6 4.1 Letters .7 4.2 Superscripts .7 5 Standard capacity .8 5.1 Basis for standard capacity date .8 5.2 Standard conditions for dry cooler capacity .8 5.3 Operating conditions for the nominal air flow .8 6 Manufacturer's data .8 7 Measurements .9 7.1 Uncertainty of measurement .9 7.2 Measurement criteria . 10 8 Testing methods and equipment . 11 8.1 General . 11 8.2 Test principals . 11 8.3 Testing equipment . 11 9 Test procedure . 12 9.1 Physical arrangement . 12 9.2 Capacity measurements . 12 9.3 Measurement of air flow rate and fan capacity . 13 10 Capacity calculations . 13 11 Conversion to standard conditions . 14 11.1 Capacity . 14 11.2 Liquid side pressure drop . 14 11.3 Nominal air flow . 15 11.4 Nominal fan power consumption . 15 12 Test report . 16 Annex A (normative) Flow meter method . 17 Bibliography . 18
SIST EN 1048:2014



EN 1048:2014 (E) 3 Foreword This document (EN 1048:2014) has been prepared by Technical Committee CEN/TC 110 “Heat exchangers”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2015, and conflicting national standards shall be withdrawn at the latest by February 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1048:1998. The main changes with respect to the previous edition are listed below: a) Clause 3 “Terms and definitions” is modified; b) The revised standard takes into account the current state of the art. 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 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. SIST EN 1048:2014



EN 1048:2014 (E) 4 Introduction This European Standard is one of a series of European Standards dedicated to heat exchangers. SIST EN 1048:2014



EN 1048:2014 (E) 5 1 Scope This European Standard applies to remote forced convection air cooled liquid coolers, within which no change in the liquid phase occurs. This European Standard does not apply to liquid coolers, designed primarily for installation within the machinery compartment of packaged products. Its purpose is to establish uniform methods to test and ascertain the following: — Product identification; — Capacity; — Air flow rate; — Liquid side pressure drop; — Energy requirements. This European Standard does not cover technical safety aspects. 2 Normative references The following documents, 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. EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 forced convection air cooled liquid cooler: “dry cooler” self contained system, that cools a single phase liquid by rejecting sensible heat via a heat exchanger to air that is mechanically circulated by integral fan(s) Note 1 to entry: In the following, “forced convection air cooled liquid cooler” is referred to as “dry cooler”. 3.2 liquid working fluid circulated through the cooling system, which remains in liquid phase during the absorption and rejection of heat during the test Note 1 to entry: The liquid can be any fluid which can be defined and that has known physical properties. 3.3 capacity cooling effect on the liquid passing though the dry cooler Note 1 to entry: It is defined as the product of the liquid mass flow rate and the difference between the enthalpies at the inlet and outlet connections of the dry cooler. SIST EN 1048:2014



EN 1048:2014 (E) 6 3.4 temperatures Note 1 to entry: All temperatures are average values ascertained over the measuring period. 3.4.1 air inlet temperature average dry bulb temperature of the air at the inlet of the dry cooler, taking into consideration the local air velocities 3.4.2 liquid inlet temperature average temperature of the liquid at the inlet connection of the dry cooler, taking into consideration the local liquid velocities 3.4.3 liquid outlet temperature average temperature of the liquid at the outlet connection of the dry cooler, taking into consideration the local liquid velocities 3.5 temperature differences 3.5.1 inlet temperature difference difference between the liquid inlet temperature and air inlet temperature of the dry cooler 3.5.2 liquid temperature difference difference between the liquid inlet and liquid outlet temperatures of the dry cooler 3.6 liquid pressure 3.6.1 liquid inlet pressure static pressure of the liquid at the inlet connection of the dry cooler 3.6.2 liquid outlet pressure average static pressure of the liquid at the outlet connection of the dry cooler 3.6.3 liquid pressure difference difference between the liquid inlet pressure and the liquid outlet pressure 3.7 rotational speed of the fans average rotational speed of all fans 3.8 heat transfer surface (air side) whole external surface of the coil which is exposed to the air flow passing through the dry cooler 4 Symbols For the purposes of this document the following apply: SIST EN 1048:2014



EN 1048:2014 (E) 7 4.1 Letters Table 1 — Letters cpA Specific heat capacity of the air kJ/(kg K) cpL Specific heat capacity of the liquid, at the mean temperature within the dry cooler kJ/(kg K) n1 Rotational speed of the fans, measured during the capacity test min−1 n2 Rotational speed of the fans, measured during the air volume flow test min−1 P Capacity kW Pfan Electrical power of the fan(s) kW pL1 Liquid inlet pressure bar pL2 Liquid outlet pressure bar patm Atmospheric pressure hPa ûpL Liquid pressure difference bar qmL Mass flow rate of the liquid kg/s qvA Volumetric flow rate of the air m3/s qvL Volumetric flow rate of the liquid m3/s Aρ Density of the air kg/m3 Lρ Density of the liquid at temperature
tL3 kg/m3 tA1 Air inlet temperature °C tL1 Liquid inlet temperature °C tL2 Liquid outlet temperature °C tL3 Liquid temperature at flow meter °C ût1 Inlet temperature difference K ûtL Liquid temperature difference K 2 Test duration s 4.2 Superscripts )/
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