Detail of GB/T 7725-2022

Introduction of GB/T 7725-2022

GB/T 7725:2022 Room air conditioner English 1 Scope This document specifies the terms and definitions, product classification, technical requirements, tests, inspection rules, marking, packaging, transportation and storage of room air conditioners. This document is applicable to room air conditioners (free-air supply) for domestic indoor comfort and similar purposes, equipped with air-cooled and water-cooled condensers, fully enclosed motor-compressor, with a rated cooling capacity of less than 14,000W (hereinafter referred to as "air conditioner"), and ducted air conditioners with a rated cooling capacity of less than 8kW and an external static pressure of less than 25Pa. This standard is not applicable to the following products and systems: ——mobile air conditioners; ——individual assemblies not constituting a complete refrigeration system; ——equipment using the absorption refrigeration cycle; ——other ducted air conditioners. 2 Normative references The following documents contain requirements which, through reference in this text, constitute indispensable requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 191 Packaging - Pictorial marking for handling of goods GB/T 1766 Paints and varnishes - Rating schemes of degradation of coats (ISO 4628:2003, NEQ) GB/T 2423.3 Environmental testing - Part 2: Testing method - Test Cab: Damp heat, steady state (GB/T 2423.3-2016, IEC 60068-2-78:2012, IDT) GB/T 2423.17 Environmental testing for electric and electronic products - Part 2: Test methods - Test Ka: Salt mist (GB/T 2423.17-2008, IEC 60068-2-11:1981, IDT) GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection (GB/T 2828.1-2012, ISO 2859-1:1999, IDT) GB/T 2829 Sampling procedures and tables for periodic inspection by attributes (apply to inspection of process stability) GB/T 4214.1 Test method for noise of household and similar electrical appliances - General requirements (GB/T 4214.1-2017, IEC 60704-1:2010, MOD) GB/T 4798.1 Classification of environmental conditions - classification of groups of environmental parameters and their severities - Part 1: Storage (GB/T 4798.1-2005, IEC 60721-3-1:1997, MOD) GB/T 5296.2 Instructions for use of products of consumer interest - Part 2: Household and similar electrical appliances GB/T 9286 Paints and varnishes - Cross cut test for films (GB/T 9286-2021, ISO 2409:2020, IDT) GB/T 14522 Artificial weathering test method for plastics, coating and rubber materials used for machinery industrial products - Fluorescent UV lamps GB 21455-2019 The minimum allowable value of the energy efficiency and energy efficiency grades for room air conditioners GB/T 22939.7 Package of household and similar electrical appliances - Particular requirements for refrigerator JB/T 10359 Environmental technical requirements of the plastics for the outdoor units for air conditioners IEC 60335-2-40:2018 Household and similar electrical appliances - Safety - Part 2-40: Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 room air conditioner device for supplying treated air to a room Note: It mainly includes a refrigeration system for cooling and dehumidification, an air circulation and purification device, and also means for heating and ventilation (such equipment can be provided in more than one assembly, the separated assemblies (split-systems) of which are intended to be used together). 3.1.2 heat pump refrigeration system that heats up indoor air by changing the flow direction of refrigerant in the refrigeration system, absorbing heat from outdoor low-temperature air and releasing heat to indoor air Note: Air conditioners with heat pump heating capacity are called heat pump air conditioners. 3.1.3 supplementary electrical heating devices electric heating device used together with a heat pump 3.1.4 cooling capacity total capacity of heat removed from an indoor area per unit time when the air conditioner is in cooling operation under specified working conditions Note: It is expressed in watts (W). The rated values of cooling capacity include rated intermediate cooling capacity, rated intermediate cooling capacity, rated maximum cooling capacity and rated minimum cooling capacity. Among them, the rated intermediate cooling capacity is 50% of the rated cooling capacity ±100W. 3.1.5 cooling power input power input of the air conditioner in the cooling capacity test. Note: It is expressed in watts (W). The rated values of cooling power input include rated cooling power input and rated intermediate cooling power input. 3.1.6 heating capacity total capacity of heat supplied to an indoor room per unit time when the air conditioner is heating operation under specified working conditions Note 1: It is expressed in watts (W). The rated values of heating capacity include rated heating capacity, rated intermediate heating capacity, rated maximum heating capacity, rated minimum heating capacity and rated low-temperature heating capacity. Among them, the rated intermediate heating capacity is 50% of the rated heating capacity ±100W. Note 2: The heating capacity is only the heating capacity of heat pumps, excluding the heating capacity of supplementary electrical heating devices. 3.1.7 heating power input power input of the air conditioner in the heating capacity test Note: It is expressed in watts (W). The rated values of heating power input include rated heating power input and rated intermediate cooling power input and rated low-temperature heating power input. 3.1.8 effective power input average electrical power input to the equipment in the required time obtained from: a) the power input from the compressor(s); b) the power input to electric heating devices used only for defrosting; c) the power input to all control and safety devices of the equipment; and d) the power input for operation of all heat exchange/transfer devices (e.g. fans and pumps). Note: It is expressed in watts (W). Effective power input exclude input power of auxiliary electric heating devices. 3.1.9 energy efficiency ratio EER ratio of cooling capacity to effective power input when the air conditioner is refrigerating in any given working conditions and requirements. Note: It is expressed in watts per watt (W/W). 3.1.10 coefficient of performance COP ratio of heating capacity to effective power input when the air conditioner is heating in any given working conditions and requirements Note: It is expressed in watts per watt (W/W). 3.1.11 standard air air with atmospheric pressure of 101.325kPa, temperature of 20℃, and density of 1.204kg/m3 3.1.12 indoor discharge air-flow supply air volume of room air flow supplied by the air conditioner indoor unit to the room or space per unit time when the air conditioner is operating in the required conditions and the ventilation and exhaust vents (if any) for indoor and outdoor air exchange are completely closed Note: It is expressed in m3/s or m3/h. 3.1.13 room-type calorimeter test device consisting of two adjacent chambers with partition walls in its middle. An chamber used as the indoor side and the other as the outdoor side, each of which is equipped with air conditioning equipment; its cooling capacity, heating capacity and water quantity can be measured and controlled, and used to balance the cooling capacity and dehumidification capacity on the indoor side and the humidification capacity and heating capacity on the outdoor side of the air conditioner to be tested. 3.1.14 air-enthalpy test method test method for cooling or heating capacity of the air conditioner, by which, the air supply parameters, the return air parameters and the indoor discharge air-flow of the air conditioner are measured; the capacity of the air conditioner is determined based on the product of the measured air volume and the difference between the enthalpy of air supply and that of return air 3.1.15 variable speed room air conditioner air conditioner, the speed of whose compressor can change within a certain range according to the size of heat load when the air conditioner is running 3.1.16 fixed speed room air conditioner air conditioner, the speed of whose compressor cannot change according to the size of heat load when the air conditioner is running 3.1.17 variable capacity room air conditioner air conditioner, the speed of whose compressor cannot change but the effective volume air delivery capacity (mass flow of refrigerant) changes within a certain range according to the size of heat load when the air conditioner is running 3.1.18 latent cooling capacity latent heat removed from a specific space by the air conditioner in a certain time period Note: It is expressed in watts (W). 3.1.19 sensible cooling capacity sensible heat removed from a specific space by the air conditioner in a certain time period Note: It is expressed in watts (W). 3.1.20 sensible heat ratio; SHR ratio of sensible cooling capacity to total cooling capacity 3.1.21 full-load operation air conditioners and controllers operate at the maximum continuous capacity specified by the manufacturer Note: All indoor units and compressor operate during full-load operation unless the indoor units and compressor are controlled by the automatic controller of the air conditioner. 3.1.22 multi-split room air conditioner device for supplying treated air to several rooms Note: It is a combined system mainly consisting of one outdoor set and more than one indoor sets, which enables multiple indoor sets to work at the same time, some indoor sets to work at the same time or single indoor set to work. 3.1.23 standby mode when connected to the main power, the air conditioner provides one or more of the following user-oriented functions or protection functions, which is a continuous mode for any product: ——other modes can be triggered by triggering remote switches (including remote control), internal sensors and timers; ——information or status displays including clocks; ——sensor-based functions. Note: In this mode, the protective devices like crankcase heater do not work. 3.1.24 cooling load factor CLF ratio of the heat load removed from the room during intermittent operation of room air conditioner by ON and OFF operations within the period formed by ON and OFF time to that removed from the room during continuous operation within the equal period 3.1.25 heating load factor HLF ratio of the heat load delivered into the room during intermittent operation of room air conditioner by ON and OFF operations within the period formed by ON and OFF time to that delivered into the room during continuous operation within the equal period 3.1.26 part load factor PLF ratio of energy efficiency of air conditioner in intermittent operation to that in continuous operation under the same temperature and humidity conditions 3.1.27 degradation coefficient CD coefficient of efficiency reduction of air conditioner due to intermittent operation 3.1.28 seasonal energy efficiency ratio SEER ratio of the total heat load removed from the room to the total power consumed when the air conditioner is in cooling operation in cooling seasons 3.1.29 heating seasonal performance factor HSPF ratio of the total heat load delivered into the room to the total power consumed when the air conditioner is in heating operation in heating seasons 3.1.30 annual performance factor APF ratio of the sum of the cool load removed from the indoor air and the heat load delivered into the room to the total power consumed during the same period in cooling and heating seasons 3.1.31 cooling seasonal total energy CSTE total power consumed by the air conditioner during cooling operation in cooling seasons Note: It is expressed in watt hour (W•h). 3.1.32 heating seasonal total energy HSTE total power consumed by the air conditioner during heating operation in heating seasons Note: It is expressed in watt hour (W•h). 3.1.33 annual power consumption APC sum of the cooling seasonal total energy and the heating seasonal total energy Note: It is expressed in watt hour (W•h). 3.1.34 cooling load intersection point of the perpendicular line passing through the temperature point and the cooling load line which is as the straight line connecting the zero load at 23℃ and the point where cooling capacity at an outdoor temperature of 35℃ is taken as the cooling building load 3.1.35 heating load it is evaluated in the room with the same size as that for cooling load evaluation, and the fixed ratio of the cooling load is calculated .... ... 3.2 Symbols 3.2.1 General symbols For the purposes of this document, the following symbols apply. An area, nozzle m2 Cd nozzle discharge coefficient — cpa1 specific heat of moist air entering indoor-side J/(kg•℃) cpa2 specific heat of moist air leaving indoor-side J/(kg•℃) cpa3 specific heat of moist air entering outdoor-side J/(kg•℃) cpa4 specific heat of moist air leaving outdoor-side J/(kg•℃) Dn nozzle throat diameter m Dt outer diameter of heat exchange tube m ha1 specific enthalpy of air entering indoor-side J/kg (dry air) ha2 specific enthalpy of air leaving indoor-side J/kg (dry air) hr1 specific enthalpy of refrigerant entering indoor-side J/kg hr2 specific enthalpy of refrigerant leaving indoor-side J/kg hw1 enthalpy of water or steam used for humidification, if no water supply is supplied to humidifier during the test, then hw1 take the enthalpy value under the water temperature in the humidifier in the reprocessing unit kJ/kg hw2 enthalpy of condensed water discharged from indoor side to outdoor side, when the temperature of condensed water cannot be measured (usually occurring inside the air conditioner), the condensate temperature can be instead of or usually assumed to be equal to the wet-bulb temperature estimation of the conditioner air supply kJ/kg hw3 enthalpy of condensed water discharged from outdoor-side reprocessing unit at temperature leaving calorimeter chamber kJ/kg hw4 enthalpy of the water supplied to the outdoor side chamber kJ/kg hw5 enthalpy of the condensed water (high temperature condition), or the frost (low temperature or ultra-low temperature condition) kJ/kg K1 2.5004×106 (latent heat of vaporization of water at 0℃) J/kg L length of heat exchange tube m Lpi a weighted sound pressure level at point i of ejector outdoor unit in the noise test dB(A) N total number of noise measuring points of ejector outdoor unit, N=4 — Pi total power input to indoor side (such as electric heating power of lighting and auxiliary devices, balance heat of humidifying devices, etc.) W Pk power input to compressor W Po total power input to outdoor side (except power input to air conditioner) W Pr power input to electric heater W Pt total power input to air conditioner W pn atmospheric pressure at nozzle throat Pa pv velocity pressure at nozzle throat or static pressure difference across nozzle Pa qmo measured value of air volume flow rate, outdoor-side m3/s qro refrigerant and oil mixture flow rate m3/s qs standard air flow kg/s qvi air volume flow rate, indoor-side m3/s qwc rate at which water vapour is condensed by the equipment g/s qwo water mass flow supplied to the outside test chamber for maintaining the test conditions g/s R1 thermal resistance of thermal insulation layer outside the heat exchange tube (m•℃)/W R2 heat transfer resistance between insulation layer and air (m•℃)/W SHR sensible heat ratio — T thickness of insulation layer m ta1 temperature of air entering indoor-side ℃ ta2 temperature of air leaving indoor-side ℃ ta3 temperature of air entering outdoor-side ℃ ta4 temperature of air leaving outdoor-side ℃ va average velocity of air, at nozzle m/s ν'n specific volume of air-water vapour mixture at nozzle m3/kg

Contents of GB/T 7725-2022

Foreword i 1 Scope 2 Normative references 3 Terms, definitions and symbols 4 Product classification 5 Technical requirements 6 Tests 7 Inspection rules 8 Marking, packaging, transport and storage Annex A (Normative) Multi-split room air conditioner Annex B (Normative) Calculation of seasonal performance factor of room air conditioner Annex C (Informative) Occurrence time of each temperature calculated with meteorological data of a typical city (taking Nanjing as an example) Annex D (Normative) Tests and calculation methods of cooling capacity and heating capacity Annex E (Informative) Measuring instruments Annex F (Informative) Air-flow measurement Annex G (Informative) Cooling condensate measurements Annex H (Informative) Pictorial examples of the heating capacity test procedures given in D.4 Annex I (Normative) Determination of noise Annex J (Normative) Test of standby power Annex K (Informative) Classification of some performance Annex L (Informative) Test method for temperature control fluctuation Annex M (Informative) Refrigerant enthalpy test method Annex N (Informative) Outdoor air-enthalpy test method Annex O (Informative) Indoor calorimeter confirmative test method Annex P (Informative) Outdoor calorimeter confirmative test method Annex Q (Informative) Balanced-type calorimeter confirmative test method Bibliography