Household electric thermal storage room heaters - Methods for measuring performance

This standard spplies to electric storage heaters having a daily operating cycle and intended to heat the room in which they are located.

Elektrische Raumheizgeräte für den Hausgebrauch - Verfahren zur Messung der Gebrauchseigenschaften

Appareils électrodomestiques de chauffage à accumulation des locaux - Méthodes de mesure de l'aptitude à la fonction

S'applique aux appareils de chauffage électrique à accumulation destinés à chauffer la pièce dans laquelle ils sont placés. Définit les principales caractéristiques d'aptitude à la fonction et spécifie des méthodes pour mesurer ces caractéristiques. Elle ne traite ni des appareils de chauffage incorporés dans la structure des bâtiments, ni des équipements de chauffage central ou des installations de chauffage par le sol.

Household electric thermal storage room heaters - Methods for measuring performance

Ta standard se uporablja za termoakumulacijske grelnike z dnevnim obratovalnim ciklom, ki so namenjeni ogrevanju prostora, v katerem se nahajajo.

General Information

Status
Published
Publication Date
31-Aug-2002
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Sep-2002
Due Date
01-Sep-2002
Completion Date
01-Sep-2002

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Household electric thermal storage room heaters - Methods for measuring performanceElektrische Raumheizgeräte für den Hausgebrauch - Verfahren zur Messung der GebrauchseigenschaftenAppareils électrodomestiques de chauffage à accumulation des locaux - Méthodes de mesure de l'aptitude à la fonctionHousehold electric thermal storage room heaters - Methods for measuring performance97.100.10Electric heatersICS:Ta slovenski standard je istoveten z:EN 60531:2000SIST EN 60531:2002en01-september-2002SIST EN 60531:2002SLOVENSKI
STANDARD



SIST EN 60531:2002



SIST EN 60531:2002



SIST EN 60531:2002



SIST EN 60531:2002



SIST EN 60531:2002



SIST EN 60531:2002



SIST EN 60531:2002



NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD60531Deuxième éditionSecond edition1999-01Appareils électrodomestiques de chauffageà accumulation des locaux–Méthodes de mesure de l'aptitudeà la fonctionHousehold electric thermal storage room heaters –Methods for measuring performance Commission Electrotechnique Internationale International Electrotechnical
CommissionPour prix, voir catalogue en vigueurFor price, see current
catalogueÓ IEC 1999
Droits de reproduction réservés
¾ Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucunprocédé, électronique ou mécanique, y compris la photo-copie et les microfilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without
permission inwriting
from the publisher.International Electrotechnical Commission3, rue de Varembé
Geneva, SwitzerlandTelefax: +41 22 919 0300e-mail: inmail@iec.ch IEC web site
http: //www.iec.chCODE PRIXPRICE CODEVSIST EN 60531:2002



60531 © IEC:1999– 3 –CONTENTSPageFOREWORD .5Clause1Scope .72Normative reference .73Definitions . 74Classification . 95List of measurements . 116General conditions for measurements . 117Dimensions and mass . 158Charge acceptance . 159Room heating capability . 1710Heat retention . 1711Temperature rises of air-outlet grilles and external surfaces . 1912Temperature rises of surfaces surrounding the heater . 1913Stability of room temperature . 2114Storage heater having a direct-acting heating function .21Figures
.........................................................................................................................25AnnexesACalorimeter .............................................................................................................. 29BClimatic test room .................................................................................................... 39CRelationship between the heating capability of the storage heater and the room .......43DInformation provided at point of sale ........................................................................57ETest report form .......................................................................................................59FBibliography ............................................................................................................. 65SIST EN 60531:2002



60531 © IEC:1999– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION___________HOUSEHOLD ELECTRIC THERMALSTORAGE ROOM HEATERS –METHODS FOR MEASURING PERFORMANCEFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational co-operation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical reports or guides and they are accepted by the National Committees in that sense.4)In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 60531 has been prepared by subcommittee 59C: Heatingappliances, of IEC technical committee 59: Performance of household electrical appliances.This second edition cancels and replaces the first edition published in 1976 and constitutes atechnical revision.The text of this standard is based on the following documents:FDISReport on voting59C/85/FDIS59C/86/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.Annexes A and B form an integral part of this standard.Annexes C, D, E and F are for information only.SIST EN 60531:2002



60531 © IEC:1999– 7 –HOUSEHOLD ELECTRIC THERMALSTORAGE ROOM HEATERS –METHODS FOR MEASURING PERFORMANCE1 ScopeThis International Standard applies to electric storage heaters having a daily operating cycleand intended to heat the room in which they are located.NOTE 1 – This standard does not apply to heating appliances incorporated in the building structure, to centralheating systems or to floor heating installations.NOTE 2 – If an appliance is intended to be operated as a storage heater or as a direct-acting room heater, it is alsotested in accordance with IEC 60675 [1]* .This standard defines the main performance characteristics of storage heaters and specifiesmethods for measuring these characteristics, for the information of users.NOTE 3 – Information which may be of interest to the consumer is listed in annex D.This standard does not specify values for performance characteristics.NOTE 4 – This standard does not deal with:–safety requirements [2];–acoustical noise [3].2 Normative referenceThe following normative document contains provisions which, through reference in this text,constitute provisions of this standard. At the time of publication, the edition indicated was valid.All normative documents are subject to revision, and parties to agreements based on thisstandard are encouraged to investigate the possibility of applying the most recent edition of thenormative document indicated below. Members of IEC and ISO maintain registers of currentlyvalid International Standards.IEC 60584-1:1995, Thermocouples – Part 1: Reference tables3 DefinitionsFor the purposes of this International Standard the following definitions apply.3.1storage heaterheater which stores heat obtained from electric energy by charging an accumulating corebefore a heat demand in a room occurs, the heat being discharged at any time___________* Figures in square brackets refer to the bibliography in annex F.SIST EN 60531:2002



60531 © IEC:1999– 9 –3.2minimum discharge conditioncondition under which the appliance is operated, the means for controlling the heat output,such as flaps and fans, being set at the lowest position3.3maximum discharge conditioncondition under which the appliance is operated, the means for controlling the heat output,such as flaps and fans, being set at the highest position, any boost position being ignoredNOTE – A boost position is a setting of a control for occasional use which results in a higher temporary fan speed.3.4average room temperaturearithmetic average of the maximum and minimum room temperatures for a setting of theambient temperature thermostat3.5ambient temperature thermostatthermostat, sensitive to the room temperature and adjustable by the user, with at least thesensing part incorporated in the heater3.6amplitudedifference between the maximum and the minimum room temperatures for a setting of theambient temperature thermostat3.7driftdifference between the average room temperatures obtained at different charge levels for asetting of the ambient temperature thermostat4 Classification4.1 According to typea) storage heater without a direct-acting heating function;b) storage heater with a direct-acting function manually controlled;c) storage heater with a direct-acting function automatically controlled.4.2 According to the control of heat outputa) storage heater without heat output control;b) storage heater with the heat output controlled by flaps or similar means;c) storage heater with the heat output controlled by a fan.SIST EN 60531:2002



60531 © IEC:1999– 11 –4.3 According to heat retentionHeat retentionin %Category³ 10 and < 301³ 30 and < 502³ 503NOTE – If the heat retention is less than 10 %, the appliance is not considered to be a storage heater.5 List of measurementsa) dimensions and mass (clause 7);b) charge acceptance (clause 8);c) room heating capability (clause 9);d) heat retention (clause 10);e) temperature rises of air-outlet grilles and external surfaces (clause 11);f) temperature rises of surfaces surrounding the heater (clause 12);g) stability of room temperature (clause 13);h) direct-acting heating function (clause 14).The results of these measurements may be given in a test report.NOTE – An example of a test report form is shown in annex E.6 General conditions for measurementsBefore carrying out the tests, the storage heater is assembled and installed in accordance withthe instructions.NOTE – Except for tests of clause 14, supplementary elements which provide direct heating are renderedinoperative.Unless otherwise specified, measurements are made under the following conditions.6.1 Supply voltageThe storage heater is supplied at a voltage which gives rated power input under steadyconditions. However, fans are supplied at rated voltage.NOTE – Steady conditions may not be established until the end of the charging period.Supply voltages are kept within ±1 %.6.2 Test roomsAll tests except those of clauses 9 and 10 are carried out in a draught-free room in which theambient temperature is maintained at 20 °C ± 1 °C, measured at a distance of approximately2 m from the appliance and 1,5 m above the floor.NOTE – Care has to be taken to ensure that the measurement point is not directly influenced by the heat output.SIST EN 60531:2002



60531 © IEC:1999– 13 –The tests of clauses 9 and 10 are carried out in a calorimeter as specified in annex A. Thetemperature of the air entering the calorimeter is maintained at 20 °C ± 1 °C.The tests of clause 13 are carried out in a climatic test room as specified in annex B.6.3 Position of the storage heaterFor the tests of clauses 8, 11 and 12, built-in appliances are installed in accordance with themanufacturer’s instructions, other appliances being placed in a test corner.Dull black painted plywood approximately 20 mm thick is used for the test corner and for theinstallation of built-in appliances.The test corner extends at least 300 mm beyond the appliance. A wooden board having aheight of 120 mm and a thickness of 15 mm, is fixed along the full length of the walls of the testcorner and in contact with the floor.Appliances are positioned in the test corner as follows:-appliances normally used on a floor are placed on the floor as near to the walls as possibleunless otherwise stated in the installation instructions;-appliances normally fixed to a wall are mounted on one of the walls and as near to the otherwall and to the floor as is likely to occur in normal use, unless otherwise stated in theinstallation instructions.For the tests of clauses 9, 10, 13 and 14, the appliance is placed on a trolley as shown infigure A.1.Appliances intended to be fixed to a wall are fixed to a board on the trolley. The dimensions ofthe board are approximately equal to the length and height of the appliance but include themounting height of the appliance above the floor.6.4 Initial conditionsAt the beginning of each test, the storage heater is at room temperature.6.5 Charging controlCharging controls are set to the maximum position.If an external signal is required in order to operate the appliance, this is provided in accordancewith the instructions.6.6 PreconditioningIf the installation instructions state that preconditioning is necessary, this preconditioning iscarried out before testing.6.7 Ambient temperature thermostatAny ambient temperature thermostat is rendered inoperative except for the tests of clause 13.SIST EN 60531:2002



60531 © IEC:1999– 15 –7 Dimensions and massThe overall length, height and depth of the storage heater, including any knobs, handles andfixing brackets, are determined.The dimensions are stated in millimetres, rounded up to the nearest 5 mm.The mass is stated in kilograms, rounded up to the nearest 0,1 kg.8 Charge acceptance8.1 Continuous charge acceptanceThe continuous charge acceptance, the continuous charging period and the charging controlreset time are determined.The storage heater is charged in the minimum discharge condition until the charging controlswitches off for the first time.The energy consumption and the charging time are measured.The energy consumption is stated as the continuous nominal charge in kilowatt-hours, roundedto the nearest 0,1 kWh.The charging time is stated as the continuous charging period in hours and minutes, roundedto the nearest 5 min.The charging supply is switched off and the appliance is operated in the maximum dischargecondition until a total period of 24 h has elapsed. The time taken when the charging controlswitches to the on-position is measured.The period between the charging control switching off and switching on is stated as thecharging control reset time in hours and minutes, rounded to the nearest 5 min.NOTE – The rated charge stated by the manufacturer may be different from the continuous charge acceptance ifthe appliance is designed for a variety of supply periods.8.2 Maximum usable nominal chargeThe maximum usable nominal charge is determined.Immediately after the test of 8.1, the appliance is charged again in the minimum dischargecondition until the charge control switches off for the first time. The energy consumption ismeasured.The energy consumption is stated as the maximum usable charge acceptance in kilowatt-hours, rounded to the nearest 0,1 kWh.SIST EN 60531:2002



60531 © IEC:1999– 17 –8.3 Minimum charge acceptanceThe minimum charge acceptance is determined.The test of 8.1 is repeated except that the charging control is set to the lowest position whichallows the storage heater to accept a charge.The energy consumption is measured.The minimum charge acceptance is stated as a percentage of the continuous chargeacceptance.9 Room heating capabilityThe capability of the storage heater to heat the room is determined.NOTE 1 – The room heating capability of a storage heater is dependent on the energy which can be discharged ata particular level of heat output.NOTE 2 – A method of determining the size of a storage heater suitable for a particular room is given in annex C.The storage heater is placed in the calorimeter described in annex A with its front facing the airoutlet and is operated for 24 h. The charging control is short-circuited and the appliance ischarged in the minimum discharge condition until the energy consumed equals the continuouscharge acceptance measured in 8.1.The charging supply is switched off and the appliance is operated in the maximum dischargecondition until a total period of 24 h has elapsed.The heat output in kilowatts is measured throughout the cycle of operation and the resultsexpressed as shown in figure 1. The energy discharged by the storage heater during anyperiod is calculated by integrating the heat output with this period.The heat content hmax of the storage heater at the end of the charging period is calculated asthe difference between the continuous charge acceptance and the energy discharged duringthis period.The heat content at any point in time during the period of operation in the maximum dischargecondition is calculated as the difference between hmax and the energy discharged during thisperiod. The heat content is expressed as a function of time as shown in figure 2.The room heating capability at any point in time is dependent on the energy discharged duringthe period of operation in the maximum discharge condition and is expressed as a function ofthe heat output as shown in figure 3.10 Heat retentionThe ability of the storage heater to retain heat is determined.The test of clause 9 is repeated except that the storage heater is kept in the minimumdischarge condition throughout the test.SIST EN 60531:2002



60531 © IEC:1999– 19 –The heat output is measured throughout the cycle of operation. The total energy discharged bythe storage heater is calculated by integrating the heat output with the 24 h period.The heat content of the storage heater at the end of this period is determined as the differencebetween the continuous charge acceptance and the energy discharged.The heat content after 24 h, expressed as a percentage of the continuous charge acceptance,is stated as the heat retention capability.The highest value of the heat output measured during the test is stated in kilowatts.11 Temperature rises of air-outlet grilles and external surfacesThe temperature rises of air-outlet grilles of storage heaters are determined, as well as thetemperature rise of external surfaces such as the front surface, the top and side panel surfacesof appliances normally placed on the floor.The temperature rises are measured by means of the probe of figure 4. The probe is applied tothe surface with a force of 4 N ± 1 N in such a way that the best possible contact is ensured.Air outlet grilles and their surrounds to a distance of 25 mm from the edge of the outlet aredivided into a minimum number of equal rectangles having sides not exceeding 50 mm inheight and 300 mm in length. The probe is applied to the grille as near to the centre of therectangles as possible.Other surfaces are divided into a minimum number of equal rectangles having sides notexceeding 300 mm. The probe is applied to the centre of the rectangles.The measurements are made during the test of 8.1, starting half an hour after the end of thecharging period.The temperature rise distribution and the highest and average temperature rises of the variousparts are stated, rounded to the nearest 1 K.NOTE – The temperature rise distribution may be determined by using a thermal camera.12 Temperature rises of surfaces surrounding the heaterThe temperature rises of surfaces surrounding the heater such as walls, floor, ceiling and shelfare determined.The measurements are made by using fine-wire thermocouples having a diameter notexceeding 0,3 mm, attached to the back of small blackened disks of copper or brass, 15 mm indiameter and 1 mm thick. The front of the disks are flush with the surface of the board. Thethermocouples are positioned to measure the highest temperature rise of each surface.The highest temperature rises are stated, rounded to the nearest 1 K.SIST EN 60531:2002



60531 © IEC:1999– 21 –13 Stability of room temperatureThe amplitude and drift are determined for storage heaters incorporating an ambienttemperature thermostat.The heater is placed in the chamber of a climatic test room as specified in annex B. The heatloss of the chamber is adjusted to a value of 1,2 times the maximum value of the heat outputdetermined during the test of clause 10, the temperature of the chamber being 20 °C.NOTE 1 – These conditions can be achieved by placing a direct-acting heater in the chamber during preparationand then removing it when the test begins.NOTE 2 – The factor 1,2 is used to make sure that the ambient temperature thermostat operates.The appliance is fully charged according to 8.1 and then placed in the chamber, the ambienttemperature thermostat being adjusted to give an average temperature in the chamber of20 °C ± 2 °C.The appliance is then operated in the maximum discharge condition. After a period of 1 h thetemperature in the chamber is measured for the two subsequent hours or until the averagetemperature drops by 1 °C if this occurs first.The average room temperature is determined.The test is repeated with the heat loss of the chamber adjusted to 0,3 times the maximumvalue of the heat output determined during the test of clause 10, the heater being only aquarter charged.The average room temperature is determined.The drift is calculated for the two charge levels.The test is repeated again with the heat loss of the chamber adjusted to 0,6 times themaximum value of the heat output determined during the test of clause 10, the heater beinghalf charged.The amplitude is determined for this charge level.The amplitude and drift are stated to the nearest 0,1 K.14 Storage heater having a direct-acting heating functionThe operation and amplitude of storage heaters incorporating a direct-acting heating functionare determined.14.1 Room heating capabilityThe test of clause 9 is repeated with the direct heating function switched on during thedischarge period.The time between the end of the charging period and the operation of the direct-acting heatingfunction is measured and stated in hours and minutes, rounded to the nearest 5 min.SIST EN 60531:2002



60531 © IEC:1999– 23 –14.2 Stability of room temperatureThe test of clause 13 is repeated with the heat loss of the chamber adjusted to a value of0,5 times the rated power input of the direct-acting heating element with the heater 20 %charged. The direct heating elements are switched on during the discharge period.The amplitude is determined after 2 h of operation and stated to the nearest 0,1 K.SIST EN 60531:2002



60531 © IEC:1999– 25 –05101520253035024681012141618202224abcTime hTime hHeat outputkW0510152025024681012141618202224Heat contentHeating capabilitykWhContinuous charge acceptance0xyzFigure 1 - Heat outputFigure 2 - Heat contentIEC
1 785/98IEC
1 784/98SIST EN 60531:2002



60531 © IEC:1999– 27 –010203040cbazyx25201510525Heating capabilitykWHeat outputW ×100Figure 3 – Room heating capabilityAdhesiveThermocouple wires0,3 in diameter according to IEC 60584-1Type k (chrome alumel)Polycarbonate tubeInside diameter 3Outside diameter 5Handle arrangementpermitting a contact forceof (4 ± 1) NNOTE – The contact face of the disk is to be flat. The thermocouple is to be soldered with care to ensure disctemperature is measured.Figure 4 – Probe for measuring surface temperatureIEC
1 786/98IEC
1 787/98SIST EN 60531:2002



60531 © IEC:1999– 29 –Annex A(normative)CalorimeterA.1
General descriptionThe calorimeter consists of a cabinet having an air inlet on one side and an air outlet on theopposite side. The air outlet contains a fan providing a constant air flow rate through thecabinet.The dimensions of the calorimeter are shown in figure A.1. It is suitable for appliances having amaximum heat output of 10 kW and dimensions not exceeding 1 600 mm in width, 1 000 mm inheight and 650 mm in depth.NOTE – For other appliances, the dimensions of the cabinet may have to be increased in order that the air flowdoes not significantly influence the heat output of the appliance.A.2
ConstructionThe walls of the calorimeter are made of expanded polystyrene having a density of 15 kg/m3 to20 kg/m3 and a heat conductivity of approximately 0,04 W/m×K.The cylindrical air outlet is connected to the cabinet by flat sloping surfaces. All sharp edgesinside the calorimeter are rounded off to reduce air disturbance.To insure the cabinet walls are airtight, the joints between the panels are glued and sealed witha silicone elastomer. A thin sheet of paper may additionally be glued to the inner surfaces. It isrecommended that the outside surfaces or edges are reinforced by fibreglass impregnated withsynthetic resin.One of the side panels is removable so that the appliance can be placed in the calorimeter.Foam rubber is used to provide an airtight seal between this panel and the rest of the cabinet.Metal rails are fixed to the base of the calorimeter so that the heater can be wheeled into thecalorimeter on a trolley. When fixing the rails, care has to be taken to minimize the heat lossthrough the fixing devices. Air is to be prevented from circulating underneath the trolley, theheight of which is not to exceed 100 mm.NOTE – An air vent controlled by a temperature-sensing device is provided to prevent overheating in case a faultoccurs during the test.The average temperature rise of the air which flows through the calorimeter is measured by20 thermocouples located in the air inlet, as shown in figure A.2, and 20 thermocouples locatedin the air outlet, as shown in figure A.3. The thermocouples are connected in series, as shownin figure A.4, and the measurement is made by means of a class 0,5 recorder.A.3
CalibrationThe calibration is carried out by placing resistance wires inside the calorimeter. Thetemperature rise of the air flowing through the calorimeter is measured for several airflowrates. For each airflow rate the temperature rise is determined for at least three different powerinputs.SIST EN 60531:2002



60531 © IEC:1999– 31 –The relationship between the power input and the temperature rise of the air is given forvarious airflow rates as shown in figure A.5.NOTE – It is recommended that the temperature rise does not exceed 10 K.A.4
Determination of heat outputWhen testing an appliance, the airflow is selected to give a temperature rise of the air as lowas possible so that the change in air density can be ignored.The heat output is proportional to temperature and is determined from figure A.5.SIST EN 60531:2002



60531 © IEC:1999– 33 –500400 x 40020MLIKASHNJFG15302000170040012501100Ø 400E520130028018204007001000ECDBDimensions in millimetresOuter wall thickness : min 100Key :A
Test cabinetB
Removable side panelC
HingesD
Lock-hooksE
Flexible sealF
Metal railsG
Air inletH
Air outletI
Safety valveJ
Temperature limited sensorK
PulleyL
CounterweightM
Emergency switchN
FanS
RecorderFigure A.1 – Test cabinetIEC
1 788/98SIST EN 60531:2002



60531 © IEC:1999– 35 –2000 mm280 mmFigure A.2 – Arrangement of thermocouples in the air inlet400 mmFigure A.3 – Arrangement of thermocouples in the air outletIEC
1 789/98IEC
1 790/98SIST EN 60531:2002



60531 © IEC:1999– 37 –Air intake thermocouplesAir outlet thermocouplesJunctionFigure A.4 – Connection of thermocouples10 kW10 KPorheat outputAir temperature riseAirflow ratesV1V2V3V4Figure A.5 – Heat output at various airflow ratesIEC
1 791/98IEC
1 792/98SIST EN 60531:2002



60531 © IEC:1999– 39 –Annex B(normative)Climatic test roomThe climatic test room consists of a test chamber for simulating the indoor temperature and arefrigerating chamber for simulating the outdoor temperature. The chambers are separated bya wall, referred to as the exterior wall, as shown in figure B.1.The heat demand in the test chamber is created by changing the temperature in therefrigerating chamber. The test chamber has a volume between 30 m3 and 40 m3, a lengthbetween 3 m and 4 m, a width between 3 m and 4 m and a height between 2,4 m and 2,6 m.In the exterior wall, there is a window of at least 3 m ´ 1,5 m having a coefficient of thermalconductance not more than 3 W/m2 K. The wall under the window has a height of at least 0,8 mand has a coefficient of thermal conductance of not more than 0,5 W/m2 K. The remainder ofthe exterior wall has a coefficient of thermal conductance of not more than 1,0 W/m2 K. Theother walls, the floor and the ceiling have a coefficient of thermal conductance of not mo
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