1、BRITISH STANDARDBS EN 14518:2005Ventilation for buildings Chilled beams Testing and rating of passive chilled The European Standard EN 14518:2005 has the status of a British StandardICS 91.140.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g3
2、8g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58beams BS EN 14518:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 29 September 2005 BSI 29 September 2005ISBN 0 580 46556 XNational forewordThi
3、s British Standard is the official English language version of EN 14518:2005.The UK participation in its preparation was entrusted to Technical Committee RHE/2, Ventilation for buildings, heating and hot water services, which has the responsibility to:A list of organizations represented on this comm
4、ittee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Se
5、arch” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal ob
6、ligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of
7、pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 14, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN
8、 STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14518June 2005ICS 91.140.30English versionVentilation for buildings - Chilled beams - Testing and rating ofpassive chilled beamsVentilation des btiments - Poutres froides - Essais etvaluation des poutres froides passivesLftung von Gebuden - Khlbalken - Prfun
9、g undBewertung von passiven KhlbalkenThis European Standard was approved by CEN on 25 March 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-d
10、ate lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the r
11、esponsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Irel
12、and, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Br
13、ussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14518:2005: EEN 14518:2005 (E) 2 Contents page Foreword 3 1 Scope. 4 2 Normative references. 4 3 Terms, definitions and symbols 4 3.1 Terms and definitions 4 3.2 Symbols and
14、 units 6 4 Test method 8 4.1 Principle 8 4.2 Test room 8 4.3 Instrumentation 9 4.4 Test procedure 10 5 Uncertainty 12 6 Test report. 12 EN 14518:2005 (E) 3 Foreword This European Standard (EN 14518:2005) has been prepared by Technical Committee CEN /TC 156, “Ventilation for buildings“, the secretari
15、at of which is held by BSI. 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 December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005.The other standards
16、dealing with chilled beams and chilled ceilings are: EN 14240 Ventilation for buildings Chilled ceilings Testing and rating prEN 15116 Ventilation in buildings Chilled beams Testing and rating of active chilled beams According to the CEN/CENELEC Internal Regulations, the national standards organizat
17、ions of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Sloven
18、ia, Spain, Sweden, Switzerland and United Kingdom. EN 14518:2005 (E) 4 1 Scope This European Standard specifies test conditions and methods for the determination of the cooling capacity of chilled beams or other similar systems with free convection, i.e. without forced air flow. Also included is the
19、 method to determine local air velocity and temperature below the beam. The purpose of the standard is to give comparable and repeatable product data. The test method applies to all types of convector cooling systems using any medium as energy transport medium. NOTE The result is valid only for the
20、specified test set up. For other conditions, (i.e. different positions of heat loads, inactive ceiling elements around the test objects or forced flow into or around the test object), the producer should give guidance based on full scale tests. This standard refers to water as the cooling medium thr
21、oughout, however, wherever water is written, any other cooling medium can also be used in the test. Where air is the transport medium this air may not be discharged into the test room. 2 Normative references The following referenced documents are indispensable for the application of this document. F
22、or dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12792:2003, Ventilation for buildings - Symbols, terminology and graphical symbols EN 13182, Ventilation for buildings Instrumentation req
23、uirements for air velocity measurements in ventilated spaces EN 14240:2004, Ventilation for buildings Chilled ceilings Testing and rating EN ISO 7726, Ergonomics of the thermal environment - Instruments for measuring physical quantities (ISO 7726:1998) 3 Terms, definitions and symbols 3.1 Terms and
24、definitions For the purposes of this European Standard, the terms and definitions given in EN 12792:2003 and the following apply. 3.1.1 chilled beam convector cooled with water and mounted under the ceiling of the test room with suspended ceiling NOTE This standard deals with passive beams, i.e. con
25、vectors with free convection only. 3.1.2 test room room in which the test object is mounted EN 14518:2005 (E) 5 3.1.3 convection flow local airflow from a heating element in the test room, or the local airflow from a test object of type chilled beam NOTE These types of convection flow can be visuali
26、sed with smoke tests. 3.1.4 room air temperature (a) average of air temperatures measured with radiation shielded sensors in positions out of the convection flow 3.1.5 globe temperature (g) temperature measured with a temperature sensor placed in the centre of the globe. The globe is placed in a pos
27、ition out of the convection flow 3.1.6 air on coil temperature (ac) reference temperature equals average air temperature on the inlet side of a cooling convector, measured with radiation shielded sensors in two positions along the convector, of the convector length from each end of the convector. On
28、e sensor is placed 30 mm vertically above the left side and the other 30 mm above the right side of the convector 3.1.7 local air temperature temperature measured at 0,75 m below the beam discharge point in the convective airflow from the beam 3.1.8 local mean air velocity velocity measured at 0,75
29、m below the beam discharge point in the convective airflow from the beam 3.1.9 cooling water flow rate (qv) average of the measured water flow rates during the test period 3.1.10 cooling water inlet temperature (w1) average of the measured water temperature into the test object during the test perio
30、d 3.1.11 cooling water outlet temperature (w2) average of the measured water temperature out of the test object during the test period 3.1.12 mean cooling water temperature (w) mean value of the cooling water inlet and outlet temperatures, (w = 0,5w1 + w2) 3.1.13 temperature difference () difference
31、 between air on coil temperature and mean cooling water temperature, ( = ac - w) 3.1.14 specific heat capacity (cp) heat require to raise the temperature of unit mass of the cooling medium by I K NOTE cpfor water = 4,187 kJ/(kgK) at 15 C. EN 14518:2005 (E) 6 3.1.15 cooling length (L) of a chilled be
32、am active length of the cooling section 3.1.16 total length (Lt) of a chilled beam total installed length of the cooling section including casing 3.1.17 cooling capacity (P) total cooling capacity of the test object calculated from the measured cooling water mass flow rate and the cooling water temp
33、erature rise 3.1.18 specific cooling capacity of a chilled beam (PL) cooling capacity divided by the (active) cooling length 3.1.19 nominal temperature difference nominal temperature difference (8 K) between the air on coil temperature and the mean cooling water temperature (N= ac - w = 8 K) 3.1.20
34、nominal cooling water flow rate (qwN) flow rate that gives a cooling water temperature rise (w2 - w1) of 2 K 0,2 K at the nominal temperature difference (N= 8 K) 3.1.21 nominal cooling capacity (PN) or nominal specific cooling capacity (PLN) cooling capacity calculated from the curve of best fit for
35、 the nominal cooling water flow rate at the nominal temperature difference (N= 8 K) 3.2 Symbols and units For the purposes of this European Standard, the symbols in EN 12792:2003 apply together with those given in Table 1. EN 14518:2005 (E) 7 Table 1 Symbols and units Symbol Quantity Unit cpSpecific
36、 heat capacity KJ/(kgK) L Active length of a chilled beam m LtTotal length of a chilled beam, including casing m P Total cooling capacity P =cpqm(w2 - w1) W PLSpecific cooling capacity of a chilled beam, relative to active length L W/m PNNominal cooling capacity at N= ac - w= 8 K W PLNNominal specif
37、ic cooling capacity at N = 8 K W/m PLtSpecific cooling capacity of a chilled beam, relative to total length LtW/m qvCooling medium volume flow rate l/s qvNNominal cooling water volume flow rate l/s qmCooling medium mass flow rate (qm= w qv) kg/s vLLocal mean air velocity at 0,75 m below the beam dis
38、charge plane m/s wDensity of cooling medium at wkg/l aRoom air temperature C gGlobe temperature C ac Reference temperature = air on coil temperature C LLocal air temperature at 0,75 m below the beam discharge plane C Temperature difference K NNominal temperature difference (8 K) K w1Cooling water in
39、let temperature C w2Cooling water outlet temperature C wMean cooling water temperature C EN 14518:2005 (E) 8 4 Test method 4.1 Principle 4.1.1 General The cooling capacity of the test object shall be determined from measurements of the cooling water flow rate and cooling water temperature rise under
40、 steady state condition. The cooling capacity shall be presented as a function of the temperature difference between the reference air on coil temperature and the mean cooling water temperature. Local air temperature and local mean air velocity shall be measured in the convective discharge from the
41、beam at 0,75 m below the beam discharge plane. The measurements shall be performed in an airtight room with controlled temperatures on the inside surfaces. Two alternative methods are allowed: 4.1.2 The internal heat supply method NOTE This method uses the same test room and heating supply to the ro
42、om as specified in EN 14240 for testing and rating of chilled ceilings. The perimeter of the room shall be insulated and have negligible heat flow through it. The perimeters shall be insulated in such a way that during the test the average heat flow through these surfaces is less than 0,40 W/m2. To
43、balance the cooling capacity of the test object, heating is supplied in the test room by means of a number of electric heated person simulators, dummies, as described in 4.3.1. The dummies are placed on the floor inside the test room. To get reproducible results it is essential that the dummies be p
44、laced in determined positions as described in 4.4.1 of EN 14240:2004. For location of beam(s) relative to the dummies, see 4.4.1 of this standard. 4.1.3 The external heat supply method To balance the cooling capacity of the test object, heating is supplied to the test room evenly distributed through
45、 the walls and the floor. The ceiling shall be insulated in such a way that during the test the heat flow through the ceiling is less than 0,40 W/m2. The temperature of the inner walls and floor of the test room shall be controlled and maintained uniform at any level necessary to keep the desired ro
46、om temperature. The maximum temperature difference between any point of the inner walls and floor outside the direct convective down flow from the beam during the test shall be less than 1,0 K. 4.2 Test room The floor area of the test room shall be between 10 m2and 21 m2. The ratio width to length s
47、hall not be less than 0,5 and the inside height shall be between 2,7 m and 3 m. The recommended inside dimensions are a length of 4 m, a width of 4 m and a height of 3 m. NOTE The test room specification enables the use of test rooms in accordance with EN 442 for the testing of chilled beams. The di
48、mensions of the test room are given as a recommendation. It is allowed that the test room dimensions deviate from the recommended dimensions. EN 14518:2005 (E) 9 The test room shall be sufficiently tight to minimise any flow from the ambient air outside, which shall not exceed 0,8 l/s/m2of the perim
49、eter surface at a pressure difference of 50 Pa. The air within the test room shall not be influenced by any forced airflow. The outside of the room or outer room as appropriate should be insulated. The heat loss to the outside should be determined by preliminary calibration (without test object cooling) to demonstrate compliance with either 4.1.2 or 4.1.3 as appropriate. It is recommended that fixed temperature sensors should be installed at least in the centre of each inside wall and fl
