Some standard content:
JB/T9061-1999
This standard is a revision of ZBJ73043-90 "Technical Conditions for Combined Cold Storage" and ZBJ73044-90 "Performance Test Methods for Combined Cold Storage". Compared with ZBJ73043-90 and ZBJ73044-90, the main technical contents of this standard are modified as follows: · Added definitions;
Modified the storage capacity classification range;
1 Modified the model compilation method and model examples; Cancelled the provision that the cold room should have an inner door;
Added fire protection requirements;
Cancelled the method of dividing the working time coefficient by volume; Modified the provisions on temperature non-uniformity in the warehouse; Cancelled the provisions on gas composition non-uniformity requirements in the gas conditioning warehouse. This standard replaces ZBJ73043-90 and ZBJ73044-90 from the date of implementation. This standard is proposed and managed by the National Technical Committee for Standardization of Refrigeration Equipment. The drafting unit of this standard: Dalian Refrigeration Co., Ltd. The main drafters of this standard are Cui Yufeng, Su Meng, Ji Jianzhong and Guo Zhijun. 1289
1 Scope
Standard of the Machinery Industry of the People's Republic of China
Pre-fab cold store
JB/T 9061-1999bzxZ.net
Replaces ZBJ73043
ZB J73 044--- 90
This standard specifies the classification and model, technical conditions, performance test methods, inspection rules, marking, packaging and storage requirements of pre-fab cold store products.
This standard is applicable to large, medium and small pre-fab cold stores and pre-fab cold stores (hereinafter referred to as cold stores) with rigid polyurethane or polystyrene foam as insulation layer and metal material as panel. Cold stores with other panel materials can refer to this standard. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. GB191--1990 Pictorial symbols for packaging, storage and transportation
GB2893-1982 Safety colors
GB/T13306---1991 Signs
GB/T13384—1992 General technical conditions for packaging of electromechanical products GBJ 10--1989
GBJ 13--1986
GBJ 14--1987
GBJ 15--1988
GBJ 17---1988
GBJ 19-1987
GBJ 72---1984
GBJ 204---1983
GBI 205—1983
Design code for reinforced concrete structures
Design code for outdoor water supply
Design code for outdoor drainage
Design code for building water supply and drainage
Design code for steel structures
Design code for heating, ventilation and air conditioning in industrial enterprisesDesign code for cold storage
Construction and acceptance code for reinforced concrete projectsConstruction and acceptance code for steel structures
JB/T6527--1992Technical conditions for heat insulation sandwich panels for modular cold storage3 Definitions
This standard adopts the following definitions.
3.1 Modular cold storage
A cold storage whose panels, evaporators, etc. are prefabricated in the factory and can be assembled on site for use. 3.2 Nominal conditions
Temperature conditions corresponding to nominal parameters (usually specified on the nameplate or sample of the relevant standard product). 3.3 Condensation
The process in which water vapor in the air condenses into water droplets on a surface below the dew point temperature. Approved by the State Bureau of Machinery Industry on July 12, 1999, 1290
Implemented from January 2000 to January 2001
4 Product classification and model
4.1 Product use classification is shown in Table 1.
Use classification
4.2 Storage capacity classification is shown in Table 2.
Storage capacity classification
Storage capacity range
3 Storage temperature classification is shown in Table 3.
Storage temperature classification
Storage temperature range
Refrigeration, refrigeration
—2～12
Model compilation method is as follows:
JB/T 9061—1999
Refrigeration, refrigeration
500～10000
10～—2
Nominal volume: Arabic numerals, unit: m2Purpose code: See Table 1
4.5 Model example:
Combination cold storage code
ZK1000: indicates a cold storage with a nominal volume of 1000m2. ZKQ6300: indicates a cold storage with a nominal volume of 6300m2 and an air-conditioned room. 5 Technical conditions
5.1 General
20～—10
- 30～— 20
5.1.1 The cold storage shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the prescribed procedures. 5.1.2 The nominal working temperature of the cold storage design is 32C, the relative humidity is 55%, and the cooling water temperature is 30℃. The temperature inside the storage is the lowest temperature of each type.
5.1.3 The cold storage shall be able to operate normally when the ambient temperature is not higher than 40C. 5.1.4 The measured internal volume of the assembled cold storage shall not be less than 98% of the nominal volume. 5.1.5 For cold storage with special use requirements, the manufacturer may negotiate with the user and make supplementary provisions in the corresponding technical documents. 5.2 Insulation sandwich panels and storage body
5.2.1 The quality of the insulation sandwich panels shall comply with the provisions of JB/T6527. 5.2.2 The joints of the assembled cold storage body should be uniform and tight, and the misalignment of the joints should not be greater than 1.5mm. The sealing materials used should be non-toxic, film-free, low-temperature resistant, aging-resistant, and have good heat insulation and moisture resistance. 5.2.3 The coating on the surface of the storage body should be uniform in color, smooth and flat, without obvious scratches or abrasions, and should be firmly combined with the metal plate without rust or peeling. 5.2.4 The door of the storage room should be flexible to open and close, without deformation, good sealing, and should be equipped with a door lock with a safety release. 1291
JB/T9061-1999
5.2.5 For cold rooms with a storage temperature below -5°C, the doors of the storage room should be equipped with electric heating wires to prevent condensation and freezing. The voltage used should be a safe voltage. For cold rooms with a storage temperature below -10°C, wind curtains or door curtains should be installed on the doors of the storage room. 5.2.6 For the gas-conditioned room and the cold room with a temperature below -10℃, the warehouse body should be equipped with a pressure balance component to prevent the warehouse body from being deformed due to excessive pressure difference between the inside and outside of the warehouse. The pressure balance component of the gas-conditioned room should be airtight. 5.2.7 All devices in the warehouse (cooling fan, shelves, etc.) should be treated with rust prevention, but cadmium-plated parts are prohibited. Wooden components should be treated with drying and anti-corrosion.
5.2.8 Moisture-proof lighting should be installed at appropriate locations in the warehouse. The lighting switch should be moisture-proof and placed on the side outside the warehouse door. 5.2.9 Small warehouses should have a temperature display at a conspicuous position on the unit's electrical control box, and the use of glass mercury thermometers is prohibited. The temperature and humidity of large and medium-sized warehouses should be monitored centrally.
5.2.10 Observation windows or small doors should be set at appropriate locations in the gas-conditioned room to facilitate inspection of storage. There should be a gas storage device on the ceiling of the air conditioning room, and its material should be odorless and not contaminate food; its volume should not be less than 1.5% of the volume of the warehouse. 5.2.11 Cold rooms with a storage temperature higher than -2°C should be equipped with heating devices according to the outdoor temperature in winter, and their heat load should be calculated according to the relevant provisions of GBJ19.
5.2.12 The wind pressure, snow pressure and earthquake intensity borne by the cold storage should meet the requirements of meteorological, hydrological and geological data provided by the local meteorological department.
5.2.13 The design, manufacture and installation of the steel structure load-bearing frame of the cold storage should be carried out in accordance with the relevant provisions of GBJ17 and GBJ205. The reinforced concrete load-bearing frame should be carried out in accordance with the relevant provisions of GBJ10 and GBJ204. 5.2.14 The inner wall of the warehouse should determine whether to set up anti-collision wooden fences according to the type of goods and the packaging and stacking method. The anti-collision wooden fence should be strong and reliable, and the height should not exceed 3m. When the anti-collision height is low (less than 300mm), a concrete boss can be added from the ground upward along the four walls of the warehouse.
5.2.15 Anti-collision devices should be installed on both sides of the cold storage hall and the inner and outer sides of the door. Other parts of the cold storage can be set according to actual needs. The anti-collision height from the foot of the warehouse should not be less than 450mm, and there should be anti-collision safety signs on the outer surface. The anti-collision safety signs should comply with the provisions of GB2893.
5.2.16 The design, construction and acceptance of the insulation floor of the cold storage should be carried out in accordance with the relevant standards and specifications. 5.2.17 The hall, platform, machine room and electrical control room of the cold storage should be designed and constructed according to actual needs and in reference to the relevant provisions of GBJ72. 5.2.18 The air conditioning room should have good air tightness. After the pressure in the warehouse reaches 100Pa (gauge pressure), the pressure should be maintained for 10 minutes, and the residual pressure in the warehouse should not be less than 50Pa (gauge pressure).
5.2.19 Under nominal working conditions, after the temperature in the warehouse reaches the design temperature, there should be no condensation on the outer surface of the warehouse. 5.2.20 The heat transfer coefficient of the cold storage body is shown in Table 4. Table 4
Storage temperature code
Heat transfer coefficient
Freezing, refrigeration
5.2.21 Fire signs should be set up in obvious positions in the cold storage, and fire prevention facilities should be equipped. When the cold storage body covers an area of more than 4000m2, fire partitions should be installed.
5.3 Refrigeration system
5.3.1 The performance parameters and quality of the refrigeration equipment of the cold storage should comply with the provisions of the relevant standards. The equipment should be reasonably laid out and compact. 5.3.2 The refrigeration system and its pipelines, pressure gauges, valves, etc. should be intact, neatly arranged and firmly installed. The connection and insulation layer of the system pipelines should comply with the requirements of the product drawings and technical documents. 5.3.3 The safety protection of the refrigeration system should comply with the requirements of the relevant refrigeration equipment safety regulations, and each protection component should be sensitive, safe and reliable.
5.3.4 The defrosting device of the cold storage should be sensitive and reliable, and the temperature rise in the cold storage during the defrosting process should not exceed 7°C. 1292
JB/T9061—1999
5.3.5 Under nominal working conditions, the working time coefficient of the refrigeration equipment should be less than or equal to 0.80. 5.3.6: Under nominal working conditions, the cooling time of the empty storage is shown in Table 5. Table 5
Single room storage capacity
>100-~1000
>1 000
500~1000
When the cold storage is in normal operation, the temperature unevenness in the storage is shown in Table 6. Table 6
Single room storage capacity
Temperature unevenness in the storage
5.4 Gas conditioning system
Cooling time
5.4.1 The performance parameters and quality of the gas conditioning equipment used in the gas conditioning storage shall comply with the relevant standards. D
5.4.2 The gas conditioning equipment, pipelines and control valves shall be arranged neatly and installed firmly. The connection of the system pipeline shall comply with the requirements of the product drawings and technical documents.
5.4.3 The length of the gas-conditioning pipeline should not exceed 100m; the deflection of each pipeline should not be greater than 1/350; the pipeline should not have a sagging U-shaped bend; the pipeline should slope toward the gas-conditioning room and should be connected to the gas-conditioning machine with a hose. 5.4.4 The gas-conditioning equipment should have good sealing. Equipment that uses combustion to reduce oxygen should be equipped with a water cut-off alarm device. Fuel gas (material) should be placed outside the gas-conditioning equipment room and should comply with relevant fire safety regulations. 5.4.5 The gas-conditioning equipment room should be equipped with a mechanical ventilation device and isolated from the refrigeration equipment room. 5.4.6 The gas analyzer should be sensitive and accurate, and the accuracy should not be less than 0.1%. 5.4.7 The time required to adjust the air in the gas-conditioning warehouse to an oxygen content of 3% ± 0.5% and a carbon dioxide content of 5% ± 0.5% is shown in the table.
Single room storage capacity
5.5 Water system
Air conditioning time
5.5.1 The design and construction of the water supply and drainage system shall comply with the requirements of the relevant provisions of GBI13~~GBJ15. The pipelines shall be firmly connected, and anti-freezing, anti-leakage and airtight measures shall be taken. The drainage shall be rapid and unobstructed. 5.5.2 The humidification equipment and pipelines installed in the warehouse below 0℃ shall be equipped with heating devices or heat insulation to prevent freezing. 5.6 Electrical system
JB/T 9061-1999
5.6.1 The electrical equipment used in the cold storage shall comply with the requirements of the corresponding standards or specifications. The equipment and components shall be adjusted accurately, and the operation shall be safe and reliable.
5.6.2 The design and installation of the electrical system shall comply with the provisions of the electrical safety regulations, the equipment shall be arranged reasonably, and the indicating instruments, switches, buttons, etc. shall be neat and firm.
5.6.3 The temperature and humidity in the warehouse should be monitored outside the warehouse. If centralized monitoring is implemented, an automatic recorder should be installed. 5.6.4 Electrical equipment should be able to work normally within 90% to 105% of the rated voltage. 5.7 The cold storage should include the following when it leaves the factory:
a) The heat insulation sandwich panels and doors of the whole warehouse; b) Refrigeration compressors and refrigeration accessories; c) Electrical control equipment;
d) Steel structure and accessories;
e) Pipes and insulation materials of each system;
f) Gas conditioning equipment, gas analyzer and accessories. Note: Indoor cold storage does not include item d); freezing and refrigeration storage does not include item f). 5.8 Warranty period
If the user complies with the various conditions specified in the product manual, within 18 months from the date of shipment from the manufacturer, or when the actual use does not exceed 12 months, if the cold storage is damaged or cannot work normally due to poor manufacturing quality, the manufacturer shall repair it free of charge. 6 Performance test methods
6.1 Performance parameters and instrument requirements
The names, symbols and units of the main physical quantities used are shown in Table 8.6.1.1
Heat transfer coefficient
Working time coefficient
Test instruments, meters and their accuracy are shown in Table 9. Thermometer
Wet and dry bulb thermometer
Power meter
Ammeter
Voltmeter
1m inclined liquid level pressure gauge
Oxygen analyzer
Carbon dioxide analyzer
6.2 Technical requirements before testing
JB/T 9061—1999
6.2.1 After the warehouse body is assembled, there should be no defects that affect the appearance in the macroscopic visual inspection, and the sealing should be good. The warehouse door switch is flexible, and the installation position of the unit and the air cooler is reasonable and reliable. It should meet the corresponding requirements of 5.2. 6.2.2 Measure the storage capacity. When measuring, the actual length, width and height of the storage shall be used for calculation, and the result shall meet the requirements of 5.1.4. 6.2.3 Complete the pressure and vacuum test of the refrigeration system in accordance with relevant regulations, and fill the refrigerant as required, and do a good job of heat insulation of the pipeline. 6.2.4 Adjust the automatic control system and circuit system to the specified values, and the operation of each component shall be accurate, flexible, safe and reliable. 6.2.5 The pressure balance components of the gas conditioning room and the cold room that meet the requirements of 5.2.6 shall be in working condition. 6.3 Determination of the heat transfer coefficient K value of the storage body
6.3.1 Test method and requirements
The heat transfer coefficient K value of the small cold storage body shall be determined by the internal heating method with an electric heater installed in the storage. It shall meet the corresponding requirements in 5.2.20.
6.3.2 Test regulations
6.3.2.1 General conditions
a) The test should be carried out indoors without direct sunlight and various heat flow influences. During the test, the deviation of the ambient temperature at each point shall not exceed 2°C, and the wind speed shall not exceed 0.5m/s;
b) The warehouse body should be preheated until the temperature difference between the inside and outside of the warehouse is not less than 20°C (not less than 10°C for a controlled atmosphere warehouse), and the measurement should be started after stabilization for 1 hour; c) For the instrument readings for calculating various heat parameters, when the internal heating method is used, three different temperature differences between the inside and outside of the warehouse should be measured, and the difference between each temperature difference should not be less than 4°C. Four different temperature differences should be measured under stable conditions. More than times, each time with an interval of 15 minutes, the fluctuation of each temperature difference value shall not exceed 1C, and the average value shall be taken;
d) The temperature reading when calculating heat shall be the average value of each measuring point inside and outside the warehouse at the same time; e) During the test time of each temperature difference, the fluctuation value of the supplied electric heating shall not exceed ±1%; f) In order to make the temperature field inside the warehouse uniform, it is allowed to use a fan for stirring, and the power of the fan motor shall be calculated to add heat; g) When the test state of the cold storage is basically the same as the normal use state, it is allowed to block the drain outlet and the gap left by the installation to prevent air circulation; h) The heat transfer coefficient K shall be the average value of three different tests of temperature difference inside and outside the warehouse. 6.3.2.2 Temperature measurement point location
The temperature measurement point location is shown in Figure 1, 7 points inside the warehouse and 5 points outside the warehouse, a total of 12 points. Wall surface
200 and above
200 with
symbol "\" for the seven temperature measuring points A, B, C, D, E, F, G inside the warehouse.1
2 symbol "\" for the five temperature measuring points M, N, O, I, Q outside the warehouse. 3 The position of the door and the measuring plane are for reference.
Above 1200
Ceiling
Above 2003
6.3.2.3 Calculation method
JB/T 9061—1999
The test principle of the internal heating method is shown in Figure 2. The heat transfer coefficient K is calculated by formula (1) to formula (3): Q
F(t, - t2)
QP, + P2
The amount of heat transferred through the insulation board, W,
Where: Q-
-heat transfer area of the insulation board, m\;
F,—surface area of the cold storage,m;
Surface area of cold storage, m;
Average temperature inside the storage, C;
Average temperature outside the storage, ℃;
-actual power consumption of electric heater, W;
P2——actual power consumption of fan, W.
Cold storage,
Power meter
Electric heater
Ammeter
)Voltmeter
6.3.3 Simulation determination and requirements of heat transfer coefficient K valueAmmeter
Power meter
Voltmeter
Regulating transformer
Large and medium-sized cold storage can adopt simulation method to determine the heat transfer coefficient K value, which shall meet the corresponding requirements in 5.2.20. 6.4 Empty warehouse cooling test and warehouse temperature non-uniformity test (1)
(3)
Small cold storage installed indoors is tested in a constant temperature room (referred to as the constant temperature room method). Other types of cold storage are tested using the heat flow compensation method. They should meet the corresponding requirements in 5.3.6 respectively. 6.4.1 Constant temperature room method
6.4.1.1 Test method
Close the door, turn off the lights in the warehouse, start the refrigeration unit, cool down the empty warehouse, record the warehouse temperature drop speed, adjust the temperature controller to the design warehouse temperature, and when the warehouse temperature reaches the design warehouse temperature ±1C, record the cooling time. 6.4.1.2 Test regulations
6.4.1.2.1—General conditions
a) The test should be carried out indoors without direct sunlight and various heat flow effects, with the ambient temperature maintained at 32°C ± 2°C and the cooling water temperature at 1296
30°C ± 3°C;
JB/T 9061—1999
b) Open the door before the test to allow sufficient exchange of air inside and outside the warehouse, and the time should be no less than 24 hours to make the temperature inside and outside the warehouse consistent; c) When cooling an empty warehouse, record once every 5 minutes within the first 30 minutes, and record once every 10 minutes thereafter; d) The test temperature for drawing the cooling curve is the average value of each measuring point in the warehouse at the same time. 6.4.1.2.2 Position of temperature measuring points and drawing curve The position of temperature measuring points is shown in Figure 1.
Use the average value of the temperature in the warehouse as the ordinate and time as the abscissa to draw the cooling curve of the empty warehouse. 6.4.2 Heat flow compensation method
6.4.2.1 Test method
Use electric heater to preheat the warehouse so that the warehouse temperature reaches the predetermined temperature and remains stable (only when the ambient temperature is lower than 32C). 6.4.2.2 Test regulations
6.4.2.2.1 General conditions
a) The test environment should avoid direct H light, there should be no heat flow around the site, and the ambient temperature fluctuation should not exceed 4°C; b) Close the warehouse door, turn off the lights in the warehouse, preheat the warehouse with a heater to make the temperature in the warehouse reach 32°C, and test it after stabilizing for 1 hour; c) Maintain the average temperature in the warehouse at 32°C ± 1°C, measure the input electric heating amount, and maintain the input electric heating amount; d) During the test time, the fluctuation value of the input electric heating amount shall not exceed ±1%; e) Start the refrigeration unit to cool down the empty warehouse, and record the start time of cooling; f) After the empty warehouse starts cooling, record the initial temperature in the warehouse, record it every 5 minutes within the first 30 minutes, and record it every 10 minutes thereafter;
g) If the ambient temperature changes during the test, the heat input to the warehouse should be corrected every 30 minutes. The correction value is calculated according to formula (4):
32 — to
Wherein: Q
Heat correction value, W;
Qo--Initial heat input of the test, W;
t. Initial ambient temperature of the test, C;
At Ambient temperature change value, °C.
h) When the warehouse temperature reaches the design temperature, record the end time of the cooling; X At
i) Draw the cooling test curve, using the average value of each measuring point in the warehouse at the same time. 6.4.2.2.2 Temperature measuring point location and drawing curve The temperature measuring point location is arranged according to Figure 3.
Draw the curve with the average value of the temperature in the warehouse as the vertical axis and time as the horizontal axis, and draw the empty warehouse cooling curve. 6.4.3 Temperature unevenness test in the warehouse
(4)
After the empty warehouse cooling test is completed, the refrigeration unit continues to operate for 15 minutes, and the temperature difference of each temperature measuring point in the warehouse is checked, which should meet the corresponding requirements of 5.3.7.
6.5 Refrigeration equipment working time coefficient test
6.5.1 Test method and requirements
This test is carried out after the test in 6.4 is completed. When the warehouse temperature reaches the requirements of 6.4.1.1 (minimum warehouse temperature), the machine is shut down, and when the warehouse temperature rises by 5℃, it is restarted (the start and stop of the small cold storage unit is automatically controlled by the output temperature controller). Record the start and stop time of each time, and repeat the record 5 times. The test results should meet the requirements of 5.3.5.
6.5.2 Test regulations
6.5.2.1 General conditions
a) Same as 6.4.1.2.1a) and 6.4.2.2.1a); 1297
b) This test is carried out in an empty warehouse. 00
1“×\ is the measuring point position.
JB/T9061-
Top view
2 When L>10m, 2 ceiling board measuring points are added. When W>10m, 2 ceiling board measuring points are added. The positions are taken in the cross section with L/3 and W/3 equidistant distribution. Figure 3
6.5.2.2 Temperature measuring points and calculation method
The temperature measuring point positions are shown in Figures 1 and 3. The working time coefficient of the refrigeration equipment is calculated according to formula (5): Mtk
Zrk + Ets
Where: F—Coefficient of refrigeration equipment working time; Ztk—Total start-up time in the whole operation cycle, h, Zrs—Total stop time in the whole operation cycle, h. 6.6 Condensation test
6.6.1 Test method and requirements
(5)
Close the warehouse door, turn off the lights in the warehouse, start the refrigeration unit, and cool down the empty warehouse until it reaches the requirements of 6.4.1.1 and remains stable. Measure the difference between the ambient temperature outside the warehouse and the average temperature of the outer surface of the cold storage. The test results should meet the requirements of 5.2.19 or meet the temperature conditions that do not produce condensation.
6.6.2 Test provisions
6.6.2.1 General conditions
a) The test should be carried out indoors without direct sunlight and various heat flow influences. b) The temperature of the empty warehouse is reduced to the level specified in 6.4.1.1 and kept stable. After 6 hours of continuous operation, the temperature is measured three times or more every 30 minutes and the average value is taken. c) The cold storage is kept in normal working condition, that is, the door heater, balanced window heater, etc. are all powered on. 6.6.2.2 The location of the temperature measuring point and the calculation method are shown in Figure 4. The temperature measuring point should be measured at least in the center of a certain insulation board of the cold storage, the joint between the boards, the intersection of the joints and the center of the door. The calculation method is according to formula (6): Where: A—temperature difference, C;
Temperature outside the warehouse, C
At = to — tw
（6）
Storage surface temperature, C.
Observe the condensation on the storage surface.
The symbol "\" represents the temperature measuring points A, B and C inside the storage. 1
—1999
JB/T 9061-
2The symbol "\" represents the temperature measuring points D, E, F and G outside the storage surface. 3The symbol "" represents the temperature measuring points H, I, J and K outside the storage. 4The position of the door and the measuring plane are for reference.
6.7 Defrosting test
6.7.1 Test requirements
This test is only used to test the reliability of the defrosting control program and the defrosting effect. However, after the defrosting is completed, the temperature rise inside the storage should comply with the provisions of 5.3.4.
6.7.2 Scope of application
This test is applicable to the occasions of electric heating, hot gas heating, and hot gas heating with water melting. 6.7.3 Test method
The defrost test is carried out by the humidification method in the warehouse (such as the method of heating water with electric heating to generate steam). 6.7.4 Test steps
a) Start the humidification device, and start the refrigeration unit when there is enough steam in the warehouse, and control the temperature in the warehouse to operate within the design temperature ±1°C;
b) Stop humidification after the evaporator surface is full of frost (observe in the warehouse), and continue to operate for 1 hour under the condition of controlling the temperature in the warehouse at the design temperature ±1°C;
c) Defrost by manual or automatic control, and record the start and end time of defrost, and record the temperature change in the warehouse every 10 minutes;
d) Check the melting of the frost layer on the evaporator surface, and measure the amount of defrost water if conditions permit. 6.7.5 Test provisions
6.7.5.1
General conditions
Same as 6.3.2.1a) or 6.4.2.2.1a.
6.7.5.2 Temperature measurement point location and data collation The temperature measurement points are the same as Figure 1 and Figure 3 (suitable for large and medium-sized combined cold storage and gas conditioning storage). 1299
Data collation shall be in accordance with the following provisions:
JB/T 9061—1999
a) List the start and end time of defrosting, the temperature change in the storage during the defrosting process, and the weight of defrosting water; b) Write down the defrosting water discharge and the operation status of the automatic control device after the evaporator surface is defrosted. 6.8 Air tightness test of gas conditioning storage
6.8.1 Test method and requirements
The air tightness test of the storage body adopts the internal pressurization method. The test results shall meet the requirements of 5.2.18. 6.8.2 Test regulations
6.8.2.1 General conditions
a) Open the door of the warehouse to allow sufficient exchange of air inside and outside the warehouse. The time should be no less than 24 hours to make the temperature inside and outside the warehouse consistent; b) Stop cooling or heating the warehouse;
c) Block all holes connected to the outside of the warehouse and seal them with sealant; d) Close the airtight door and check that its seal should be good; e) Start the blower to increase the pressure inside the warehouse to 100Pa higher than the ambient pressure, then close the blower and valve, and record the start time of the test;
f) Record the pressure value inside the warehouse every 1min, and the reading should be accurate to 5Pa; g) After the test lasts for 10min, record the residual pressure value inside the warehouse; h) Draw the pressure drop curve inside the warehouse.
6.8.2.2 Airtightness test equipment layout and curve drawing Test principle As shown in Figure 5, the liquid level pressure gauge and the blower pipe should be sealed. Reservoir body
Dent-type liquid level pressure gauge
Blower
Use the pressure drop value in the reservoir as the ordinate and the test time as the abscissa to draw the air tightness test curve. 6.9 Air conditioning test in empty warehouse
6.9.1 Test method and requirements
The test should be carried out according to the physical or chemical air conditioning method selected by the air conditioning warehouse after the reservoir body air tightness test is qualified. The test results should meet the requirements of 5.4.7.
6.9.2 Test regulations
6.9.2.1 General conditions
a) Clear the gas conditioning system pipelines and valves (valves in non-gas conditioning rooms should be closed tightly); b) Start the gas conditioning equipment and record the start time of the gas conditioning test; c) After the gas conditioning test starts, record the 02 and CO2 content in the warehouse, and record it every 1 hour thereafter, with a test accuracy of 0.1%; d) When the 2 content in the warehouse reaches 3% and the CO content reaches 5%, turn off the gas conditioning equipment and record the corresponding time; e) Draw the gas conditioning test curve and record the corresponding gas content value in the warehouse at the same time. 6.9.2.2 Measurement point location and drawing curve
The gas sampling and analysis system installed in the warehouse is used for measurement, and it can also be measured near the test warehouse. The gas conditioning test curve of the empty warehouse is drawn with the gas content in the warehouse as the vertical coordinate and the test time as the horizontal coordinate. 1300
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