Some standard content:
National Standard of the People's Republic of China
Household refrigerating appliances
Freezers
GB/T 8059.3--1995
Replaces GB8059.3-87
This standard is equivalent to the international standard ISO5155:1995 "Household refrigerated food storage boxes and food freezers-main properties and test methods".
1 Subject content and scope of application
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, marking, packaging, transportation, storage, etc. of freezers. This standard applies to closed motor-driven compression household freezers (hereinafter referred to as freezers) with a capacity of less than 500L. This standard does not apply to freezers for special purposes.
2 Reference standards
GB191 Pictorial symbols for packaging, storage and transportation
GB1019 General rules for packaging of household appliances
GB/T2423.17 Basic environmental testing procedures for electric and electronic products Test Ka: Salt spray test method GB2828 Count sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB2829 Count sampling procedures and sampling tables for periodic inspection (applicable to inspection of stability of production process) GB3785 Electroacoustic performance and test methods of sound level meters GB/T4214 Determination of sound power level of household appliance noise GB4706.1 General safety requirements for household and similar electrical appliances GB4706.13 Safety of household and similar electrical appliances Particular requirements for household refrigerators and food freezers GB4798.1 Environmental conditions for application of electric and electronic products Storage GB4798.2 Environmental conditions for application of electric and electronic products Transport 3 Terminology
3.1 Household refrigerating 3.2 Frozen food storage appliances An insulated box with appropriate volume and equipment for household use, which uses the means of consuming electrical energy to cool and has one or more compartments. Under the specified test conditions, when food at or below -18°C is placed in the box, the temperature of these compartments does not rise above -18°C. Note: In some cases, the room is allowed to have a "two-star part" (see Appendix B (Supplement) B6). 3.3 Food freezer
An insulated box with appropriate volume and equipment for home use, which uses electrical energy to cool and has one or more rooms. These rooms can freeze 4.5kg of test packages in every 100L of effective volume within 24h under the specified refrigeration load test conditions and can store food according to 3.1.
3.4 "two-star part" star\section The part of the food freezer or frozen food storage box that is not independent (i.e., it has local partitions but does not have its own doors and covers for independent use). The storage temperature of this part measured under the specified conditions and methods is not higher than -12°C. 3.5 General definition3. 5. 1 Top-opening type A refrigerator in which food is taken in and out through the top door or cover. 3.5.2 Upright type
A refrigerator in which food is taken in and out through the front door. 3.5.3 Overall dimensionsoveralldimensions When the door or cover is closed, it is expressed by the dimensions of a rectangular parallelepiped with a horizontal bottom connected to the inside of the refrigerator (length × width × height). Includes accessories but does not include handles. If there are other protrusions, they should be stated separately. 3.5.4 Space required for useoverall space Teguired in The total dimensions of the exterior dimensions plus the space required for free circulation of cooling air when the refrigerator is in use and the space required for the minimum opening angle of the door when all accessories enter and exit the box. Accessories include containers and shelves, as well as water trays that need to be taken out manually (see Figure 1). Width when the door or lid is open
3.5.5 Volume
3.5.5.1 Gross volume
Figure 1 Total space required for use
The volume included in the inner wall when the refrigerator door (or lid) is closed. If forced air cooling is used, the volume of the space occupied by the air duct, evaporator, fan and other accessories should be subtracted from it when calculating the gross volume.
3.5.5.2 Total gross volume The sum of the gross volumes of the cryogenic chamber and the freezer (including the "two-star" grade part therein) (including compartments with or without independent doors). 3.5.5.3 Effective volume storage volume1137
GB/T 8059.3-1995
The volume remaining after deducting the volume occupied by each component and the space that is deemed not to be used for food storage from the gross volume of any compartment is the effective volume of the compartment.
3.5.5.4 Rated effective volume rated storage volume The effective volume marked by the manufacturer.
3.5.5.5 Total effective volume total storage volume The sum of the effective volumes of the low-temperature room and the freezer compartment of the refrigerator. 3.5.5.6 Rated total effective volume rated total storage volume The total effective volume marked by the manufacturer.
3.5.6 Shelf
Shelf (or shelf) is a component with a certain mechanical strength on which food is placed. The shelf can be fixed or movable. 3.5.7 Load limit load limit
The surface surrounding the effective volume of frozen food. 3.5.8 Load limit line A permanent mark indicating the effective volume limit of frozen food. 3.6 Definition relating to some performance characteristics 3.6.1 Energy consumption The energy consumption of a refrigerator in steady operation for 24 hours. It is measured in accordance with the specified test method at an ambient temperature of 25°C (SN, N, ST types) or 32°C (T type).
3.6.2 Rated energy consumption The energy consumption marked by the manufacturer.
3.6.3 Storage temperatures The highest temperature of the hottest "M" package in a food freezer or frozen food storage box (5.4.1). 3.6.4 Freezing capacity The mass of the test package when the test temperature is reduced from 25±1°C (N type) or 32±1°C (T type) to -18°C within 24 hours under the test conditions specified in 6.2.2 (the temperature referred to is the arithmetic mean of the instantaneous temperatures of all "M" packages). Freezing capacity is expressed in kg/24h. 3.6.5 Rated freezing capacity The freezing capacity specified by the manufacturer.
3.6.6 Ballast load
When conducting the freezing capacity test, each freezer compartment of the refrigerator is pre-loaded with a certain amount of test bags and "M" bags that reach the specified temperature within the rated time.
3.6.7 Freezing load
When conducting the freezing capacity test, the simulated load used to measure the freezing capacity of the refrigerator (the temperature drops from 25℃ to -18℃ within 24h). 3.6.8 Temperature rise of load time refers to the time difference between the moment when the hottest "M\ package" in the freezer (box) or any "three" class room (box) reaches -18°C and the moment when any "M" package (excluding the two-star part) first reaches -9°C under the specified test conditions when the refrigeration system is interrupted, that is, the temperature rise time of the load.
3.6.9 Defrosting
Defrosting methods can be divided into the following three types:
3.6.9.1Automatic defrostingAutomatically defrostedThere is no need to manually start the defrosting device during defrosting, and there is no need to manually restore its normal operation and remove the defrost water after defrosting, that is, the whole defrosting process is completed automatically.
3.6.9.2Semi-automatically defrosted1138
GB/T 8059.3—1995
The defrosting device needs to be manually started during defrosting, and the defrosting restores its normal operation automatically. The removal and treatment of defrost water can be manual or automatic.
Another type of semi-automatic defrosting is that the defrosting device does not need to be manually started during defrosting, and there is no need to manually restore its normal operation after defrosting, but the removal of defrost water is manual.
3.6.9.3Manually defrostedThe defrosting device needs to be manually started during defrosting, and it also needs to be manually restored to its normal operation and remove the defrost water after defrosting. However, there are also automatic removal and treatment of defrost water.
3.6.10 “M\package” M\package
A test package with the dimensions of 50mm×100mm×100mm and a temperature sensing element installed at the geometric center according to 6.1.2. 3.6.11 Control cycles The period between two consecutive starts or two stops of a refrigeration system controlled by a thermostat in stable operation is a control cycle.
3.6.12 Stable operating conditions When the refrigeration system is in cyclic operation, including any automatic defrosting cycle, the stable operating condition is considered to be reached when the temperature values of each “M” package and the copper cylinder at each corresponding point in adjacent control cycles fluctuate within the range of ±0.5K and the average temperature difference within a period of about 24h is not greater than ±1K.
When the refrigeration system is in continuous operation, although the temperature has certain changes, within 18 hours, the temperature rise and fall of all "M" packages and copper cylinders or brass cylinders does not exceed 0.5K, and it is also considered to have reached a stable operating state. 3.6.13 Percentage running time R Under the conditions of given ambient temperature and average temperature in the box, the percentage of running time is: Where: R——Percentage running time;
R=×100
d——The time when the refrigeration system is running (on) in a certain integer control cycle; D——The total time of a certain integer control cycle. (1) www.bzxz.net
3.6.14 Ambient temperature Ambient temperature is the temperature of the space around the refrigerator during the test. It refers to the arithmetic mean of the average temperatures tal and ta2 measured at two measuring points 1m above the ground and 350mm away from the vertical center line of the two side walls of the refrigerator. 3.7 Refrigerant A fluid that transfers heat through phase change in a refrigeration system. It absorbs heat at low temperature and low pressure and releases heat at high temperature and high pressure. 3.8 Definition relating to compression-type appliances 3.8.1 Compression-type appliance The refrigeration process of a refrigerator is completed by evaporation of liquid refrigerant at low pressure in an evaporator. The generated vapor is mechanically compressed to become high-pressure vapor and then cooled in a condenser to restore the liquid refrigerant. 3.8.2 Hermetically sealed motor-driven refrigerating compressor The compressor and motor (or at least its moving parts) are installed in an airtight casing sealed by welding or other methods. After assembly, it cannot be disassembled. There are no moving parts outside the casing. 3.8.3 Hermetically sealed compressor refrigerating system This refrigeration system mainly consists of a motor-driven compressor, a condenser, a pressure reducing element, an evaporator and all other components containing refrigerant. These components are permanently connected by welding or other methods by the manufacturer. 3.8.4 Refrigerant compressor A mechanical component that sucks refrigerant vapor from the evaporator and discharges it into the condenser at a higher pressure. 3.8.5 Expansion device1139
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An element that reduces the pressure of the refrigerant from the condensing pressure to the evaporating pressure. 3.8.6 Condenser
A heat exchanger in which the decompressed liquid refrigerant is liquefied by transferring heat to the external cooling medium.
3.8.7 Evaporator
evaporaton
A heat exchanger in which the decompressed liquid refrigerant is evaporated by absorbing heat from the cooled medium. 3.8.8 Thermostat
A device that automatically adjusts the operation of the refrigeration system according to the temperature of the evaporator or the compartment. 4. Product Classification
4.1 Refrigerators can be divided into the following categories according to their use:
a. Refrigerator (indicated by the Chinese Pinyin letter C), b. Refrigerator-Freezer (indicated by the Chinese Pinyin letter CD); Freezer (indicated by the Chinese Pinyin letter D). C
4.2 According to the climate environment when the freezer is used, it is divided into: Type
Subtemperate (SN)
Temperate (N)
Subtropical (ST)
Tropical (T)
4.3 Model naming
Product models and their meanings are as follows:
Climate environment temperature
10~32℃
16～32℃
18～38℃
18~43℃
Improvement design serial number, expressed in Chinese phonetic alphabetical order, specification code (effective volume L expressed in Arabic numerals); purpose classification code (expressed as a, b, c in 4.1); product code (household refrigerator).
Example BD-150A
Indicates a 150L household freezer with the first improved design. 5 Technical requirements
The freezer shall comply with the requirements of this standard and GB4706.13, and shall be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 5.1 Operating environment
The freezer shall be usable under the following environmental conditions. 5.1.1 Ambient temperature
Temperate type (N)
Subtropical type (ST)
Tropical type (T)
5.1.2 Ambient humidity
Relative humidity shall not exceed 90%.
5.1.3 Power supply
Not higher than 32℃;
Not higher than 38℃,
Not higher than 43℃.
Voltage 187~242V;
Power supply frequency 50±1Hz.
5.2 Effective volume
The effective volume unit is expressed in "L".
5.3 Total effective volume
GB/T8059.3—1995
The total effective volume of refrigerators shall be calculated in accordance with the provisions of Appendix B (Supplement), and the calculated value shall not be less than 97% of the rated total effective volume. 5.4 Refrigeration performance
5.4.1 Storage temperature
When tested in accordance with Article 6.2.1, the freezer, frozen food storage box and its "two-star" grade part shall be able to keep the highest temperature of the hottest "M\ package equal to or lower than -18°C. The "two-star" grade part shall be equal to or lower than 12°C. (See Table 1). Table 1 Storage temperature
Climate type
5.4.2 Refrigeration capacity
Environment Ambient temperature
Freezer and "three-star" room
"two-star" part
The evaluation of freezing capacity shall be tested according to 6.2.2. 5.4.2.1 Measure the time required to freeze 25kg test bag (ballast load)/100L effective volume from 25℃ (N) or 32℃ (T) to -18℃ (this temperature is the average value of the instantaneous temperature of all "M\ bags). The result shall not be greater than 110% of the rated value. 5.4.2.2 According to 6.2.2.The test conditions specified in Article 3, the refrigeration capacity is the mass of the test package (this temperature is the average value of the instantaneous temperature of all "M packages) when the refrigerated load is frozen from 25℃ (N) or 32℃ (T) to -18℃ within 24 hours, expressed in kg/24h. The measured refrigeration capacity should not be less than 4.5kg/100L effective volume, and should not be less than 90% of the rated value. 5.4.2.3 When testing the refrigeration capacity, the maximum temperature reached by any frozen "M" package should be equal to or lower than -15℃. 5.4.3 Power consumption
When tested in accordance with Article 6.2.3, the actual power consumption should not be greater than 110% of the rated value. 5.4.4 Load temperature recovery time
When tested in accordance with Article 6.2.4, the time for the temperature of any "M" package in the freezer to recover from -18℃ to -9℃ shall not be less than 600min. 5.5 Structure and material properties
5.5.1 Insulation and anti-condensation
The refrigerator should have good insulation performance, and the insulation material should not have obvious shrinkage and deformation, and the outer surface of the refrigerator should not be allowed to accumulate excessive water vapor when working.
When the refrigerator is subjected to the condensation test in accordance with 6.3.1, no bead-like or flowing condensation is allowed to appear on the outer surface of the refrigerator. 5.5.2 Air tightness
When the door (or lid) is closed, there should be no pores in the wall of the box to allow air to enter the box. The door seal (or lid seal) should have good air tightness. After the door (or lid) is closed, the door seal (or lid seal) should be tight all around. When tested in accordance with 6.3.2, the paper should not slide freely. 5.5.3 Durability of door hinges and handles
The door hinges and handles should have sufficient strength and a certain degree of corrosion resistance. When the frozen food storage compartment (or freezer) of the refrigerator has a separate outer door, it shall be intact and its airtightness shall not be impaired after 10,000 opening and closing tests according to the durability test in 6.3.3. After the test, it shall be subjected to the airtightness test in 6.3.2 again, and the result shall meet the requirements of 5.5.2.
5.5.4 Shelves and containers
GB/T 8059.3-1995
Shelves, containers and similar parts shall have sufficient mechanical strength. After the mechanical strength test in 6.3.4, deformation that causes them to lose their original functions shall not occur, especially for moving parts. They shall also be able to move completely when loaded with a cylindrical load. 5.5.5 Internal materials of refrigerators
Internal materials of refrigerators shall not contaminate the stored food when in contact with the stored food, nor shall they transmit toxic substances to the food. The materials shall be resistant to moisture and food acids.
5.5.6 Sealing performance of refrigeration system
The refrigeration system shall be sealed. When leak detection is carried out in accordance with Article 6.3.6, the annual leakage of refrigerant in any part shall not exceed 0.5. 5.5.7 Noise and vibration
5.5.7.1 When the refrigerator is in operation, no obvious noise shall be generated. When measured in accordance with Article 6.3.7.1, for refrigerators below 250L, the sound power level of the noise shall not be greater than 52dB(A).
The sound power level of the volume noise of the freezer with a fan is below 300L
300L~400L (including 400L)
401L~500L (including 500L)
≤55 dB(A)
≤60 dB(A)
≤63 dB(A)
5.5.7.2 When the refrigerator is in operation, no obvious vibration should be generated. When measured according to Article 6.3.7.2, the effective value of its vibration velocity shall not exceed 0.71 mm/s.
5.5.8 Electroplated parts
After the metal electroplated parts of the refrigerator are subjected to the salt spray test according to Article 6.3.7, check the surface corrosion of the electroplating layer. The number of metal rust spots and rust marks on the plating layer shall not exceed 2 per 100cm2, and the area of each rust spot and rust mark shall not exceed 1mm2. When the surface area of the test piece is less than 100cm2, rust spots and rust marks are not allowed.
5.5.9 Surface coating
After the surface coating of the refrigerator is tested according to 6.3.8 and 6.3.9, check the coating surface. The appearance should be good, and no obvious pinholes are allowed. In any 100cm square area on the surface of the sample, there should be no more than 2 bubbles with a diameter of 0.5 to 1mm, and bubbles with a diameter greater than 1mm are not allowed.
5.5.10 Appearance requirements
The appearance should not have obvious defects, and the decorative surface should be flat and bright. The coating surface should be flat and bright, with consistent color, uniform color, and firm coating. There should be no obvious flow scars, scratches, pits, wrinkles, bubbles, missing coating, and aggregated sand.
The decorative layer of electroplated parts should be smooth and fine, with uniform color, and should not have defects such as spots, pinholes, bubbles, and coating peeling. The surface of plastic parts should be flat, smooth, fine, and uniform in color. There should be no defects such as cracks, bubbles, obvious shrinkage holes and deformation. The nameplate and all signs should be complete. The nameplate should meet the requirements when checked in accordance with Article 8.1.1. 5.6 Requirements for refrigerator structure and design
Appropriate anti-condensation measures should be taken when designing refrigerators. Facilities for collecting, discharging and treating defrosting water should be designed. Dust accumulation should be avoided and reduced as much as possible when designing condensers. The evaporator should be designed to prevent damage during normal use. It should be made of non-toxic and corrosion-resistant materials. The coating or plating used to protect the surface of the evaporator should be corrosion-resistant, non-toxic, and temperature-resistant. Components that may be replaced, such as switches, light bulbs, thermostats, etc., should be designed to be installed in places that are easy to operate, replace and safe. When designing the refrigeration system, its materials should have sufficient strength and should not be degraded by the effects of refrigerants, lubricants or other mixtures.
Freezers and "three-star" frozen food storage rooms should have load limit lines (see Figure 2), but they may not be set in the following cases: any space within the gross volume of the room meets the "three-star" storage conditions; a.
b. Its load limit is specified by special structural forms, such as baskets, baffles, etc.; 1142
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The load limit is determined by natural limits (see Figure A1). The load limit line should be marked clearly and not faded, and can be marked with one or more load limits. The size of the mark can be reduced in proportion, but it cannot be less than half of the specified size.
100~150
This edge represents the load limit
Figure 2 Load limit line mark
6 Test method
6.1 General test conditions
6.1.1 Test room
The refrigerator is placed in this test room for testing according to the method of 6.1.1.4. The ambient temperature in the test room is adjustable within the range of 10～43℃. The dimensions are in millimeters
Parameters such as ambient temperature, ambient humidity and ambient air flow rate in the test room are represented by the measured values at the measurement points specified in 3.6.14.
If multiple refrigerators are tested at the same time, their environmental parameters should be the arithmetic average of the values measured at the specified points of each refrigerator. 6.1.1.1 Ambient temperature
a. Test storage temperature:
b. Power consumption test, load temperature recovery test, refrigeration capacity test: N type, ST type
GB/T 8059.3—1995
When other tests are performed, they shall be carried out at the temperature specified in the test requirements. c.
When the stable operating state is required and during the test, the temperature at each specified measuring point (see 3.6.14) shall maintain the specified ambient temperature, and its fluctuation range shall be within ±0.5K. Within a range of 2m from the test platform (6.1.1.4), the vertical temperature gradient shall not exceed 2K/m. 6.1.1.2 Ambient humidity
When the relative humidity of the test room is not specially specified, it is generally 45% to 75%. 6.1.1.3 Ambient air velocity
The ambient air velocity in the test room shall not be greater than 0.25m/s. 6.1.1.4 Placement of refrigerators
Each refrigerator is placed on a solid wooden test platform painted matte black. The platform is open below to allow free air circulation. The top of the platform should be 300mm higher than the floor of the test room. The platform extends outward, at least 300mm, but not more than 600mm beyond the two side walls and the front wall of the refrigerator. The back of the platform should extend to the vertical partition at the back of the refrigerator. The air circulation around the refrigerator should be restricted by three vertical partitions painted matte dark black around the refrigerator. The rear partition is parallel to the back of the refrigerator and close to the limiter on the back of the refrigerator, or maintains a certain distance from the back of the refrigerator as required by the manufacturer. The left and right partitions are parallel to the sides of the refrigerator and are 300mm apart. The width of the partition is 300mm, see Figure 3.0.30
Dimensions in meters
Figure 3 Partitions restricting air circulation (plan view) The three vertical partitions shall be continuous and uninterrupted and fixed to the test platform. The height of the partitions shall be at least 300 mm higher than the top of the refrigerator. The refrigerator shall be placed to prevent direct radiation from cold and heat sources in the test room. The refrigerator shall be away from other objects in the test room to eliminate the influence of objects with different temperatures from the ambient temperature. When a built-in refrigerator is combined with other appliances (non-refrigeration appliances), the test shall be carried out in the combined state, but the other appliances in the combination shall not be operated.
6.1.2 Test package
When a refrigerator with a load is to be used for various performance tests, a test package with a rectangular parallelepiped shape shall be used. 6.1.2.1 Test package dimensions and their allowable deviations. The dimensions of the test package before freezing and the mass of the contents are shown in Table 2. Permissible deviation of length dimension:
When the dimension is 25mm and 50mm, the permissible deviation is ±1.5mm; a.
b.When the dimension is 100mm and 200mm, the permissible deviation is 3.0mm. The permissible deviation of mass is ±2%. 1144
Dimension specification, mLm
25×50×100
50×100×100
50×100×200
6.1.2.2 Composition of test package
The test package is composed of the following components:
a. Each 1000g of filling material contains
hydroxyethyl methyl cellulose
sodium chlorofluoride
para-fluoro-meta-cresol
GB/T 8059.3-1995
Table 2 Test package dimensions and mass
Mass g
The freezing point of this filling material is -1℃, and its thermal properties are equivalent to lean beef. The packaging material is a layer of plastic film or a suitable material with negligible water vapor exchange with the ambient medium. After the filling material is filled, the packaging material is immediately sealed. Note: ① In order to compensate for the water evaporated during the preparation of the filling material, it is recommended to add 4% of water. ② A laminated film can be used, which is a laminated film composed of a 120μm thick high-pressure quenched ethylene film that is easy to seal and a layer of about 12.5μm thick polyethylene film bonded together on the outside. 6.1.2.3 “M\ package
“M\ package or measuring package refers to a test package with a mass of 500g (Article 6.1.2.1), with a thermocouple for temperature measurement installed at its geometric center. The thermocouple should be in direct contact with the filling material. Measures should be taken to minimize heat conduction from the outside. 6.1.3 Preparation before the test
The refrigerator test should be carried out at rated voltage and rated frequency, or within the range of (100 ± 1)% of the average value of the rated voltage. Before the test, the refrigerator should be placed in the environmental conditions specified in Article 6.1.1.1 and left to stand naturally (with the door open) so that the temperature inside the box reaches equilibrium with the ambient temperature, and the maximum temperature difference between them does not exceed ± 1K. After equilibrium is reached, the refrigerator can be tested. 6.1.3.1 Setting of the thermostat
a. If the thermostat is adjustable, it should be adjusted to a position that meets the requirements of the test. b. If the thermostat is not adjustable (the manufacturer has already adjusted it, but it is not available for users to adjust), the test shall be carried out in the delivery state. c. If the manufacturer's manual has provisions, it shall be adjusted in accordance with the manual. 6.1.3.2 Anti-condensation heater
If the refrigerator is equipped with an anti-condensation electric heater, the electric heater shall be turned on during other tests, except for the power consumption test and condensation test, which are otherwise specified. If the electric heater is adjustable, it shall be adjusted to the maximum heating position. 6.1.3.3 Accessories and parts in the refrigerator
At the beginning of the test, various accessories and parts in the refrigerator shall be in normal positions, the ice box and all containers, shelves, etc. shall be empty (unless otherwise specified), the evaporator shall be free of frost and ice, and the accessories and inner walls in the box shall be dry. If the refrigerator is equipped with a cold storage device, unless it cannot be disassembled, the cold storage device shall be removed during the type inspection. If there is an additional electric heater in the refrigerator, only one working state, either on or off, shall be taken during the type inspection, which shall be determined by the manufacturer. The lead wire connecting the temperature measuring element in the box to the measuring instrument should not affect the airtightness of the refrigerator. 6.1.4 Measuring Instruments
6.1.4.1 Temperature Measuring Instruments
Temperature measurement should use thermocouples or other temperature measuring devices with equal accuracy. 1145
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The temperature sensing part should be inserted into the test package (6.1.2.3) or the center of the tinned copper cylinder. The mass of the tinned steel cylinder is 25g, and the diameter and height are about 15.2mm.
The instrument for measuring temperature should be accurate to ±0.3K during type inspection and to ±1K during factory inspection. 6.1.4.2 Humidity Measuring Instruments
Relative humidity measurement should use instruments for measuring dry and wet bulb temperatures. The accuracy should be ±0.3K during type inspection and to ±1K during factory inspection.
6.1.4.3 Electrical measuring instruments
Ammeters, voltmeters, power meters, etc. in electrical instruments shall have an accuracy of not less than 0.5 during type inspection and not less than 1.0 during factory inspection.
The scale value of the electric energy meter shall be able to read 0.01kW·h, and the accuracy shall be not less than 1.0 during type inspection and not less than 2.5 during factory inspection.
6.1.4.4 Other measuring instruments
Noise measuring instruments shall use sound level meters of type I or above specified in GB3785, or other test instruments with equivalent accuracy. The frequency response range of vibration test instruments is required to be 10 to 1000Hz, and the relative sensitivity within its frequency range shall be based on the relative sensitivity of 80Hz, and the relative sensitivity of other frequencies shall not exceed -10% to +20%. The sensitivity of the leak detector shall not exceed 0.5g of annual leakage. 6.1.5 Determination of the temperature of the freezer (or box) and the frozen food storage room (or box) and its "two-star" grade part The temperatures in the freezer (or box) and the frozen food storage room (or box) and its "two-star" grade part shall be measured in the "M\ package. The placement of the "M" package is in accordance with the provisions of Appendix A (Supplement) and should be distributed throughout the test package. The temperature of these compartments (or boxes) or their "two-star\" grade parts, that is, the maximum temperature value of the hottest "M\ package in the compartment (or box) or its "two-star" grade part, shall meet the requirements of Article 5.4.1. 6.2 Refrigeration performance test method
6.2.1 Storage temperature Test
The refrigerator is placed in the test room, and the test conditions are carried out in accordance with the provisions of Article 6.1. The thermostat is adjusted to a certain position. The test package and "M" package are placed in each compartment of the refrigerator in accordance with Article 6.1.3. The power is turned on for at least 24 hours. When the refrigerator reaches a stable operating state, the storage temperature of the refrigerator is measured. The measured value shall meet the requirements of Article 5.4.1.
6.2.2 Freezing capacity test
Applies only to food freezers.
6.2.2.1 The refrigerator is placed in the test room, and the test conditions shall meet the provisions of Article 6.1 (except for those specially noted). The thermostat is adjusted according to the following three conditions:
a. If the freezer thermostat has a continuous operation switch, adjust it to the continuous operation position; if not, adjust it to the lowest temperature. After the refrigerator has been running until it reaches a stable operating state (at least 24 hours), start loading the ballast load in accordance with Article 6.2.2.2. b. If the freezer is equipped with a timer, the timer should be set so that the refrigerator runs continuously, and the thermostat will resume operation after the set time is reached (the time scale of the timer can be converted to represent the amount of refrigeration). After the freezer has been running without load for at least 24 hours, adjust the timer to the position when it is in a stable operating state. After reaching a stable operating state, load the ballast load in accordance with Article 6.2.2.2.
c. If the freezer does not belong to the above two types, after the freezer reaches a stable state (at least 24 hours), load the ballast load according to 6.2.2.2.
6.2.2.2 Ballast load freezer
When the freezer reaches the requirements of 6.2.2.1, according to 5.4.2 and Table 3, load the ballast load with a temperature of 25±1℃ (N, ST) or 32±1℃ (T). 1146
Effective volume of freezer V
V≤50
50V100
GB/T 8059.3—1995
Ballast load W
Number of test packages According to the principle of test package placement (Appendix A), place as many as possible, but leave space for the frozen load
Note: ① If the remaining space cannot accommodate the specified frozen load, the ballast load should be compressed to 80%, 60% or 40% of the above specified value at one time. ② If the manufacturer's instructions indicate that there is a separate section for food freezing, this section should only be loaded with frozen load. However, the space left for the frozen load should not exceed one of the following two situations (whichever is greater): a. 30% of the total effective volume of the freezer and the "two-star" level room; b. Calculated based on a space volume of 3L per kilogram of frozen load. "M\ packages should be evenly distributed in the ballast load. The minimum number of "M\ packages should be one of the following two situations (whichever is greater): a. 4
b. 1 for every 15kg ballast load (test package). Note: If there are shelves or containers in the door, two "M" bags should be installed and not included in the above figures. The "three-star" grade frozen food storage room or "two-star" grade part is the same as the storage temperature test in 6.2.1. The placement of the test bags is shown in Appendix A. Filled with test bags and "M\ bags.
All test bags and "M\ bags should be pre-frozen to about -18℃ (-12℃ for "two-star" grade parts) before being put into the refrigerator for testing. Placement of test bags:
The test bags should be placed horizontally.
If the manufacturer's instructions have already specified, place them in the position specified in the instructions; a.
If there are no regulations in the instructions, all (or most) test bags should be placed in direct contact with the refrigeration surface (or cold air flow) to facilitate freezing.
Record the temperature of each "M\ bag and the time required for the arithmetic mean of the instantaneous temperature of all "M" bags to reach -18℃. 6.2.2.3 Freezing of Refrigerated Load
When the arithmetic mean of the instantaneous temperature of all "M\ packages in the ballast load reaches -18°C (if necessary, all test packages should be reassembled), the freezer continues to operate without changing the setting position of the thermostat until a stable operating state is reached. According to 5.4.2 and the following requirements, a refrigerated load with a temperature of 25±1°C (N, ST type) or 32±1°C (T type) is loaded. If the refrigerator has a separate frozen food storage room, the frozen test packages (ballast load) should be placed in the frozen food storage room. The frozen load test package is placed in the freezer (unless otherwise specified in the instructions). The principle of placing the frozen load is the same as that of the ballast load. The placement is the same. The placement of the refrigerated load cannot be in direct contact with the ballast load. The "M" packages for measuring temperature should be evenly distributed among the refrigerated load test packages. The number of refrigerated load "M" packages is determined by the following two situations (the larger one is taken):
a. 2;
b. 1 for every 3kg of refrigerated load.
Record the temperature and time of the ballast load and the refrigerated load "M" packages until the arithmetic mean of the instantaneous temperature of all refrigerated load "M" packages reaches -18°C. The time required for the refrigerated load to reach -18°C from loading should be noted and recorded. The measured time should meet the requirements of Article 5.4.2.
6.2.2.4 Determination of Refrigeration Capacity
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