1、BRITISH STANDARD BS6332-6: 1990 Thermal performance of domestic gas appliances Part6: Specification for thermal performance of combined appliances: fanned-circulation ducted-air heater/circulator UDC 697.245.51:644.1:683.945:006.3/.8BS6332-6:1990 This BritishStandard, having been prepared under the
2、directionof the Gas StandardsPolicy Committee, waspublished under the authorityof the Board of BSIandcomes into effect on 30 June1990 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference GSE/17 Draft for comment87/75479 DC ISBN 0 580 18746 2 Committees res
3、ponsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Gas Standards Policy Committee (GSE/-) to Technical Committee GSE/17, upon which the following bodies were represented: Association for Consumer Research (ACRE) British Gas plc British Non-Ferrous Metals F
4、ederation Consumer Policy Committee of BSI Department of Energy (Energy Efficiency Office) Department of the Environment (Building Research Establishment) Department of Trade and Industry (Consumer Market Division) Department of Trade and Industry (Consumer Safety Unit, C A Division) Gas Consumers C
5、ouncil Institution of Gas Engineers Liquefied Petroleum Gas Industry Technical Association (UK) National Caravan Council Limited Royal Society for the Prevention of Accidents Society of British Gas Industries The following body was also represented in the drafting of the standard, through subcommitt
6、ees and panels: Co-opted member Amendments issued since publication Amd. No. Date CommentsBS6332-6:1990 BSI 11-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Thermal performance 1 4 Test methods 3 Figure 1 Installation of type C 2air heaters on
7、 the test duct 6 Figure 2 Sampling probe for type B air heaters 7 Figure 3 Sampling probe for type C air heaters 8 Figure 4 Sampling position for type C 1air heaters 9 Figure 5 Sampling position for type C 2air heaters 9 Figure 6 Nomogram for the calculation of mean specific heat of dry combustion p
8、roducts 10 Figure 7 Test rig (circulator) 11 Table 1 Minimum net efficiency of air heater under still air conditions: claimed value 2 Table 2 Minimum net efficiency of circulator under still air conditions: claimed value 2 Publications referred to Inside back coverBS6332-6:1990 ii BSI 11-1999 Forewo
9、rd This Part of BS6332 has been prepared under the direction of the Gas Standards Policy Committee to provide a specification for the thermal performance of combined gas-fired fanned-circulation ducted-air heaters/circulators and thus complements the safety requirements for such appliances specified
10、 in BS5258-9. The performance requirements of air heaters and circulators individually given in BS6332-5 andBS 6332-1, respectively, form the bases of this Part of BS6332. In anticipation of this Part of BS6332, being the subject of third party certification schemes, as are other Parts of BS6332, it
11、 provides for a claim by the appliance manufacturer of a numerical value for the thermal efficiency of a product model. The test authority can then ascertain that a sample submitted for type approval meets this claimed value within a specified test equipment tolerance. Subsequently any sample select
12、ed from production of the particular model is expected to comply with a verification value, which also takes into account a specified production tolerance. Also in common with other Parts of BS6332, efficiency values are based on the use of net calorific values, instead of gross values as formerly,
13、in alignment with European practice. Parts of BS6332 already published are as follows. Part1: Specification for thermal performance of central heating boilers and circulators; Part2: Specification for thermal performance of gas fires; Part3: Specification for thermal performance of combined applianc
14、es: gas fire/back boiler; Part4: Specification for thermal performance of independent convector heaters; Part5: Specification for thermal performance of fanned-circulation ducted-air heaters. As a consequence of the initiation, by the CEC, of the Gas Appliance Directive and the preparation of Europe
15、an Standards in support of this Directive, it is probable that Parts of BS6332 will be withdrawn, in due course, and replaced by new BritishStandards aligned with CEN standards. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are
16、responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to12, an inside back cover and a back cover. This standard has
17、been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS6332-6:1990 BSI 11-1999 1 1 Scope This Part of BS6332 specifies the thermal efficiency requirements and associated methods of test for gas-fired appli
18、ances consisting of a fanned-circulation ducted-air heater of rated heat input not exceeding60kW 1)combined with a circulator of rated heat input not exceeding8kW 1) . Thecombined appliance is usually of integral construction, the circulator being fitted inside the air heater casing. It also covers
19、fanned-circulation ducted-air heaters which are designed to be fitted with circulators, as a purchasers option. This standard only applies to circulators intended for use as an integral part of the combined appliance. Circulators intended for independent use are covered by BS6332-1. This Part covers
20、 appliances of the following categories, as described in A.1.3 of BS4947:1984: I T , I N , I L/B , I L/P ; II TN , II NL , II NL/B , II NL/P ; III, III TNL/B , III TNL/P ; and of the following types, as defined in BS1179-6:1980: type B: open-flued appliances; type C: room-sealed appliances; type C 1
21、 : balanced-flue appliances; type C 2 : Se-duct appliances. This Part is only applicable to the appliances listed above that comply with BS5258-9. NOTEThe titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of BS633
22、2, the definitions given in BS1179:1967 and BS1179-6:1980 apply, together with the following. 2.1 claimed efficiency the efficiency of an appliance claimed by the manufacturer. It may be a net efficiency or a gross efficiency. Where the term is used in this Part, it always relates to net efficiency,
23、 either the efficiency as claimed or the equivalent value calculated from a claimed gross efficiency in accordance with the relationship given in the footnote to Table 1 2.2 gross efficiency the efficiency of an appliance calculated on the assumption that the heat content of the test gas is its gros
24、s calorific value 2.3 net efficiency the efficiency of an appliance calculated on the assumption that the heat content of the test gas is its net calorific value 2.4 test house efficiency the net efficiency of an appliance measured at the test house on a sample submitted for type approval purposes 2
25、.5 verification efficiency the net efficiency of an appliance measured during any surveillance or check testing of production appliances 3 Thermal performance 3.1 Efficiency requirements: fanned-circulation ducted-air heater 3.1.1 General 3.1.1.1 The appliance shall comply with3.1.2 and, as appropri
26、ate, with3.1.3.1, 3.1.3.2 or3.1.3.3. 3.1.1.2 Efficiency values shall pertain to and shall be measured by the method described in4.1 and4.2.1. 3.1.2 Efficiency: still air conditions (all types of appliance) 3.1.2.1 The manufacturer shall claim a net efficiency value which shall be not less than that
27、given in Table 1. 3.1.2.2 The corresponding test house efficiency shall be not less than the claimed efficiency minus2. 3.1.2.3 The corresponding verification efficiency shall be not less than the claimed efficiency minus5. 3.1.3 Efficiency: adverse flue conditions 3.1.3.1 Type B appliances 3.1.3.1.
28、1 The test house efficiency, measured under the conditions specified in3.1.3.1.2, shall be not less than the claimed efficiency minus9. 1) Based on gross calorific value.BS6332-6:1990 2 BSI 11-1999 Table 1 Minimum net efficiency of airheater under still air conditions: claimedvalue 3.1.3.1.2 The app
29、liance shall be operated at the rated heat input or at the maximum of the rated range, as appropriate. A gas sampling probe shall be inserted200mm below the top of the1m vertical secondary flue to enable the average CO 2content across the flue to be determined. An extraction fan shall then be connec
30、ted to the flue and arranged to create a flue flow such that the CO 2content is reduced to half its original value. 3.1.3.2 Type C 1appliances 3.1.3.2.1 The test house efficiency measured under the conditions specified in3.1.3.2.2, shall be not less than70%. 3.1.3.2.2 The appliance shall be operated
31、 at the rated heat input or at the maximum of the rated range, as appropriate. The appliance shall be set up on the wind test rig described in Appendix B of BS5258-9:1989 and shall be tested with a horizontal wind of4.5m/s directly on the terminal. 3.1.3.3 Type C 2appliances 3.1.3.3.1 The test house
32、 efficiency, measured under the conditions specified in3.1.3.3.2, shall be not lessthan70%. 3.1.3.3.2 The appliance shall be operated at the rated heat input or at the maximum of the rated range, as appropriate. The appliance shall be set up on the test duct as described in Appendix C of BS5258-9:19
33、89 in such a way that the distance between the back of the appliance and the end of the outlet connecting duct is twice the diameter of the latter (seeFigure 1). Ifit is necessary to increase the length of the connecting ducts using extension ducts, suitable extension ducts shall be supplied by the
34、manufacturer. The appliance shall be tested with an upward air flow of velocity1.5m/s. 3.2 Efficiency requirements: circulator 3.2.1 General 3.2.1.1 The appliance shall comply with3.2.2. Anatural draught type B appliance shall also comply with3.2.3. 3.2.1.2 Efficiency values shall pertain to and sha
35、ll be measured by the method described in4.1 and4.2.2. 3.2.2 Efficiency: still air conditions 3.2.2.1 The manufacturer shall claim an efficiency value which shall be not less than that given in Table 2. Table 2 Minimum net efficiency of circulator under still air conditions: claimedvalue 3.2.2.2 The
36、 corresponding test house efficiency shall be not less than the claimed efficiency value minus2. 3.2.2.3 The corresponding verification efficiency shall be not less than the claimed efficiency value minus5. 3.2.3 Efficiency requirements for natural draught type B appliances: adverse flue conditions
37、3.2.3.1 Test house efficiency 3.2.3.1.1 The test house efficiency, measured under the conditions specified in3.2.3.1.2, shall be not lessthan75%. 3.2.3.1.2 The appliance shall be operated at the rated heat input, or the maximum rated heat input if range-rated. Appliance rating Heat input at which me
38、asurement made Minimum claimed efficiency (net) a fixed rated % 80 range minimum of range 77 maximum of range 80 a The gross efficiency value is related to the net value for the four reference gases as follows: for TGA(4) for NGA for LPGA for LPGC gross value=0.899 net value gross value=0.901 net va
39、lue gross value=0.926 net value gross value=0.922 net value Appliance rating Heat input at which measurement made Minimum claimed efficiency (net) a fixed rated % 79 range minimum of range 76 maximum of range 79 a The gross efficiency value is related to the net value for the four reference gases as
40、 follows: for TGA(4) for NGA for LPGA for LPGC gross value=0.899 net value gross value=0.901 net value gross value=0.926 net value gross value=0.922 net valueBS6332-6:1990 BSI 11-1999 3 A gas sampling probe shall be inserted at200mm below the top of the1m secondary flue to enable the average CO 2con
41、tent across the flue to be determined. An extraction fan shall then be connected to the flue and arranged to create a flue flow such that the CO 2content is reduced to half its original value. 3.2.3.2 Verification efficiency 3.2.3.2.1 The manufacturer shall supply to the test authority, along with t
42、he type approval sample, drawings of the draught diverter. Performance requirements of production appliances under adverse flue conditions shall be deemed to be met provided that the dimensions of the draught diverter are within the tolerances given. 3.2.3.2.2 If it is necessary to test production a
43、ppliances under adverse flue conditions, the verification efficiency shall be not less then the corresponding test house efficiency minus3. 4 Test methods 4.1 General conditions of test 4.1.1 Test room The room shall be adequately ventilated but free from draughts likely to affect the performance of
44、 the appliance. The room temperature shall be maintained at20 5 C and, during the course of a test, it shall not vary by more than2 C. 4.1.2 Preparation of appliance 4.1.2.1 All appliances The appliance shall be set up in the free standing condition, taking due account of the manufacturers instructi
45、ons. It shall be adjusted in accordance with the manufacturers instructions, using the reference test gas(es) in accordance with clause4 of BS4947:1984 and corresponding to the appliance category, and inlet pressure(s), as follows. NOTEExcept in cases of dispute, typical distributed gases may be use
46、d for this test. The setting pressure of the burner shall be adjusted, if necessary, according to the Wobbe number of the gas used for the test. Before any tests are made, the appliance shall be operated at its working temperature for a period sufficient to dry any insulation and remove any temporar
47、y finish that might interfere with observations. 4.1.2.2 Type B appliances An appliance with a vertical flue outlet shall be fitted with1m of vertical secondary flue of the same nominal diameter as the flue outlet. An appliance with a horizontal flue outlet shall be fitted, in accordance with the ma
48、nufacturers instructions, with a horizontal flue of the minimum length necessary to pass through a wall of300mm thickness and connected, via the manufacturers specified method of adaptation, to a1m length of vertical flue. The secondary flue shall be made from sheet metal and shall be thermally insu
49、lated with glass wool of at least20mm thickness. NOTEIf the circulator is flued independently of the air heater, then it will not be necessary to insulate the circulator flue. 4.1.2.3 Type C 1appliances Appliances shall be tested with the flue ducts and terminal assembled in accordance with the manufacturers instructions for a wall thickness of300mm. 4.1.2.4 Type C 2appliances Appliances shall be tested with the connecting ducts assembled in accordance with the manufacturers instructions but, except where otherwise stated, not co
