Lab Technical Solution of Refrigerator And Freezer Performance
Refrigerator and freezer performance laboratory technical solutions
This laboratory meets the performance and reliability testing needs
of household refrigerators and refrigerators. It can test 6
household refrigerators or 6 refrigerators at the same time. By
adjusting the temperature and humidity of the test environment to
meet the working conditions required for refrigerator and freezer
testing, the type tests under various standard working conditions
and simulated use conditions are completed. The test room includes
a constant temperature room, a measurement and control room, a
refrigeration and air-conditioning system, a power supply system, a
test system, and a software system. The entire environment system
adopts automatic control. Equipment control and measurement realize
the functions of automatic measurement, automatic recording,
automatic printing of test reports, automatic identification of
equipment abnormalities, and shutdown alarm.
Designed and manufactured according to the following standards:
IEC 62552 domestic refrigeration appliances-characteristics and
SASO 2664-2017 Refrigerators, Freezers and Freezers-Energy
Performance, Testing and Labeling Requirements
(1) Test items can be realized:
Power consumption test (standard, loading, comprehensive power
Loading energy efficiency test;
Cooling capacity test
Freezing capacity test
Load temperature rise
Current / voltage / power / power factor
Frequency conversion test, etc.
Can test direct-cooled, air-cooled refrigerators.
(2) Laboratory test accuracy:
Repeatability accuracy: once installed, the deviation between the
test result and the average value within three different time
periods is less than or equal to 2.0%;
Experiment room temperature humidity control accuracy: ≤ ± 0.10 ℃,
control accuracy of other working conditions ≤ ± 0.15 ℃. (Subject
to the test results of the temperature and humidity sensor of the
(1) External dimensions: 9200L × 6000W × 3850H (mm);
Assembled with δ120mm polyurethane foam thermal insulation library
board, the inside and outside surface materials are δ0.8mm color
steel plate (color ivory white);
The floor insulation board uses 120mm thick single-sided SUS304
stainless steel polyurethane depot board, and the density of the
polyurethane depot board is ≥40kg / m3. The surface stainless steel
is not less than 4mm thick, and the color steel plate at the bottom
is 0.8mm thick.
The ceiling is made of perforated aluminum.
A 5 # channel steel base is laid under the storehouse to ventilate
and insulate the floor and the ground. The channel steel base can
bear the impact of the prototype transport.
Allowable payload: The performance test of 6 refrigerators can be
performed at the same time.
(2) Door: 2400W × 2600H, revolving double-opening return door,
which can be opened both inside and outside; the door frame has an
electrically heated anti-condensation device; the door has a 350W ×
450H observation window, and double-layer insulating glass. There
is no threshold, and the slope tooling of the door is convenient
for the tested machine to enter and exit the laboratory. The height
of the tooling slope can be adjusted manually.
(3) Lighting: Use T8 type 16W LED lights, the test room with
anti-fall protection and high humidity, low temperature environment
(working environment temperature -40 ~ 60 ℃, relative humidity 95%)
requirements; (2) The Philips lamps are selected from Philips and
imported LED light sources are used, which can save more than 60%
of electricity compared with other energy-saving lamps. (3) The
luminous flux of the lamps is> 2700lm, the color temperature is
5000k, and the color rendering index is ≥ 70, which ensures that
the laboratory illumination is not less than 250lm;
(4) Test stations: 6 stations, each station is equipped with 30
temperature measurement channels; 1 current measurement channel,
equipped with two 10A universal sockets, the test power supply can
perform voltage and frequency conversion, and provide the power
required by the test standard.
(5) Test bench: size: 1800W × 1300D × 2600H, the surface is coated
with black matte paint (water-based environmental protection matte
paint); the test bench is made of wood, and the countertop is 30cm
off the ground, and the two sides (30cm wide and 2cm thick) can be
used. Adjust left and right, the load is not less than 400kg, 1 set
/ work station, 6 sets in total.
Test fixture table (size according to plan):
2.1 Environmental conditions in the test room
(1) Temperature and humidity range in the test room:
Temperature: 5 ～ 60 ℃ ± 0.3 ℃
Humidity: 35% ～ 95% RH ± 3% (control the humidity between 5 ～ 50 ℃)
(2) Temperature distribution accuracy in the test room:
When no-load (referring to when no test prototype is placed), the
temperature deviation between the environment does not exceed 0.5
Temperature distribution accuracy of the test room when the test
prototype is installed (when the test prototype is not turned on):
temperature unevenness in the horizontal direction ≤ 0.6 ° C (the
temperature difference between any two points on the same
horizontal plane of the laboratory platform does not exceed 0.6K);
vertical distribution gradient ≤ 0.88 ℃ / m, the temperature at the
center of the platform below the platform 20-30mm away from the
platform should be within ± 0.8K of the specified ambient
(3) Temperature rise and fall
The operating conditions are completely guaranteed by the operating
unit itself, and the no-load temperature is reduced from 60 ° C to
5 ° C for no more than 90 minutes;
Temperature rise from 5 ℃ to 60 ℃ within 90min
After the unit is started and stabilized, it is required to reach
stable working conditions within 2 hours, and the fluctuation of
each test parameter of the unit under stable working conditions
does not exceed the national standard test operating condition
(4) Wind speed in the test room
Household refrigerators: the uniformity of the temperature field in
the room is better; the wind speed is less than 0.25m / s (the
measured wind speed on both sides of the refrigerator after the
refrigerator is placed on the table does not exceed 0.25m / s)
2.1 circulating air system
(1) Vertical air supply; return air under the supply air through
the ceiling hole plate;
- Air-conditioning cabinet (all stainless steel, panel and frame
thickness are 1.5mm) and air duct.
Control parameters and measuring instruments
Ambient temperature control
Control range: 5 ～ 65 ℃
Control accuracy: ± 0.3 ℃
Temperature sensor: Pt100, transmitter, resolution 0.1 ℃
Regulator: Digital PID regulator, UT35A, Yokogawa, 1
Ambient humidity control
Control range: 35% ～ 95% RH
Control accuracy: ± 3% RH
Temperature sensor: Pt100, transmitter, resolution 0.1 ℃
Regulator: Digital PID regulator, UT35A, Yokogawa, 1
Thermocouple: T type, φ 0.3, thermocouple from isothermal terminal
pillar is 3000mm long, 30 / station, can be borrowed between
Measurement range: -30 ℃ ～ + 50 ℃, after software correction, the
error is not
more than 0.3 ℃, and the temperature measurement range can reach
Measurement accuracy: ± 0.3 ℃ (-20 ～ 80 ℃), the rest ± 0.5 ℃;
Isothermal terminal: American Omega SMP-MF special socket. The
is made of 2mm stainless steel plate.
Compressor frequency measurement
Humidity range: 0 ~ 500Hz, 1 per station
Accuracy: ± 1% RH
Brand: Japan Love Model, Model: MS3087
Pressure transmitter: KELLER model PAA-23SY, class 0.25, absolute
Low pressure range: 0 ~ 10bar, 1
High pressure range: 0-20bar, 1;
Can be borrowed between workstations;
Wind speed measurement
Range: 0 ~ 10m / s, 1
Accuracy: ± 3%
Brand: TSI, Model: 8475
Power meter: Yokogawa WT310E, RS232 interface, one for each of the
three stations, a total of six;
Single-phase inverter power supply: 6 units, brand Yidi
Single-phase power output power: 5KVA;
Power input: 3Φ380V ± 10%, 50Hz, 3Φ4W
Output range: 1Φ3W 0 ～ 400V, frequency 50 / 60Hz, adjustable
Voltage control accuracy: ± 1V power supply regulation rate
<0.5% frequency stability <0.01% total harmonic distortion
THD <1.5% output voltage crest factor: CF≤1.4
Using oxygen-free copper conductor isolation transformers,
Infineon, SEMIKRON and other brand IGBT modules, imported
electrical components of joint venture brands, reliable and stable
Data acquisition instrument
Yokogawa GM10, measurement channel: 180 points, network interface
Equipment and devices
4.1 Refrigeration and air-conditioning equipment
(1) Water-cooled compression condensing unit: Bitzer compressor
unit, 5HP + 5HP compressor refrigeration, evaporator has electric
defrost function; refrigeration cycle system has water-cooled shell
and tube condenser, drying filter, sight glass, thermal expansion
valve , Solenoid valve, aluminum fin evaporator (with hydrophilic
film), high and low pressure gauges and high and low pressure
Refrigeration system diagram:
Refrigeration system diagram
Equipped with refrigeration units of different specifications, the
units are configured with 5HP and 5HP respectively to meet the load
requirements of different working conditions, so that the heating
output ratio is not higher than 30%; meanwhile, the air valve is
configured to adjust the air volume range;
Unit circuit adds auxiliary circuit: liquid injection bypass
circuit, which can automatically start and stop the bypass circuit
according to the compressor exhaust temperature;
(2) Copper heat exchangers and coils
(3) Electric heater: stainless steel electric heating tube,
controlled by solid state relay, adopts stainless steel finned
tube, has good insulation measures with the box and good
explosion-proof measures for the power terminal, has interlock
protection with the fan, and overcurrent , Overheating, overload,
leakage, and other protective measures, the air handler must be
divided into front and rear electric heating.
(4) Electric heating humidifier: made of stainless steel with
insulation layer), controlled by solid state relay, with automatic
water supply and drainage device, stainless steel steam pipe, with
water level control, overheating protection and water shortage
alarm function. Humidifier structure diagram is as follows:
Humidifier structure exploded view
(5) Centrifugal fan: double inlet centrifugal fan with inner rotor,
(6) Air valve: aluminum alloy air valve, manual adjustment;
Explosion diagram of air reprocessing machine
(7) The system has security protection:
1) High and low pressure protection of refrigeration compressors;
2) Overcurrent protection of refrigeration compressors;
3) Exhaust temperature control of refrigeration compressor;
4) cooling water flow protection;
5) Fan overcurrent protection and wind pressure protection;
6) Overheating protection inside the air reprocessing machine;
7) Over-temperature protection inside the test chamber;
8) Humidifier dry burning protection;
9) humidification and water shortage protection;
10) Smoke alarm protection in test room；
Air sampling device
The sampler bench is made of SUS304 stainless steel, and the
temperature and humidity sensor is Japan's Chino R220-30. The
sampling device can be moved, and the moving wheels are made of
universal resin rubber wheels.
Test Standards and Tooling
Test package: (IEC62552 standard)
(1) M package: 50x100x100, quantity of 50 packages;
(2) 500g package: 50x100x100, quantity of 150 packages;
(3) 500g package: 25x100x200, quantity of 100 packages;
(4) 1kg package: 50x100x200, quantity of 100 packages.
Copper cylinder: specification 15.2mm * 15.2mm, 25g, quantity 80.
Test kit: (SASO2664 standard)
(3) M package: 1300x100x40, quantity 500;
Copper cylinder: size 30 + 5mm, 25g, quantity 80.
Ambient temperature special tooling: Ambient temperature
distribution support, a total of 12 sets. It is used for the
ambient temperature test specified by each station standard, and
the height and position can be adjusted according to the size of
Electrical system and control cabinet
(1) Electrical control block diagram:
(2) Electric control cabinet:
PLC: Mitsubishi, reserved 6 backup channels, 1
Touch screen: Weilun MT8100i, 1 set
Thermostat: UT35A, 2 sets
Regulator: Seamanton PAC30D
Air switch: Schneider
Contactor, relay: Schneider
Isolation transformer: 3kVA, single phase
With perfect system protection device: over-current protection,
emergency stop switch, cooling fan, leakage protector, etc., and
three-color sound and light alarm indicator.
(3) Station power box: 6
Made of no less than 2mm thick SUS304 stainless steel;
Single-phase 10A waterproof backup power socket with leaky open
circuit, voltmeter, and power meter. Provide city power waterproof
single-phase 10A power socket;
(4) TC terminal box: 6
Made of no less than 2mm thick SUS304 stainless steel;
Safety protection measures
(1) Camera system
Camera: 4, 8 million pixels, with infrared night vision function,
It adopts pan / tilt control, zoom and zoom control, and can
record, playback and copy video.
Display: 55-inch LED display, brand Konka or TCL (three sets of
laboratories share one display)
(2) Anti-static device:Install a set of static elimination balls
outside the test room to avoid static electricity in the room; the
laboratory has a reliable ground to prevent static electricity
regeneration, and the ground resistance is not greater than 4 ohms.
(3) Fire prevention measures
Equipped with smoke overtemperature detection system.
The laboratory and the measurement and control cabinet are equipped
with smoke overtemperature sensors.
The storage body adopts flame retardant insulation material. The
self-extinguishing time of the storage body insulation material is
less than 7s, and the density is more than 40kg / m3.
(4) Safety signs and instructions
Obvious warning signs such as “Do not open the door by
non-maintenance personnel” and “Caution of electric shock” are
affixed to the cabinet door;
Laboratory LED display "testing" "low temperature" indicator.
1Data terminal and measurement and control software
Lenovo commercial microcomputer (mainstream standard),
configuration: Inter core i7-8700 CPU 3.4GHz memory 8GB,
independent graphics card, hard disk 1T or more, display: 21 ”LCD
Computer tables and chairs
Uninterruptible Power Supply
500VA, Shante, 1 set
Based on WIN10 window system, Chinese and English interface, with
perfect test function and good stability. (With test software
(1) Can easily input the parameters such as the refrigerator model,
manufacturer, production number (test number), compressor model,
compressor manufacturer, test items and other judgment requirements
at each station.
(2) The power consumption data can be tested at the same time when
the storage temperature test is performed.
(3) Both air-cooled refrigerators (cabinets) and direct-cooled
refrigerators (cabinets) and electric-controlled refrigerators
(cabinets) can be tested.
(4) In the same test environment, the test items or test objects
can be changed (inserted) at any time, and it will not adversely
affect the tests of other refrigerators in progress
(5) Can check the collected data (including all data and start-stop
data) without affecting the detection sampling.
(6) The test conditions of all stations can be displayed in full
screen, and single station can be displayed in full screen.
(7) Calculate and display the current average temperature tm of the
refrigerating compartment and the maximum temperature tfmax of the
freezing compartment, the input time and the total time after the
conversion into a single station. The power is displayed. Zh
(8) The temperature and power curve can be flexibly displayed on
the screen (you can choose any number of points to display).
(9) The judgment of stable conditions can be made automatically,
and a prompt can be given. When the test is put into operation, it
can be carried out manually or automatically.
(10) During the test, data such as sampling time, temperature,
current, voltage, power, working coefficient, electrical energy,
time interval, temperature controller points, (pressure is an
optional test item) and other data;
(11) The data includes all collected data or data collected at
certain intervals, and there is a corresponding processing program
that can print it in the form of a curve.
(12) The test software should be in a WINDOWS environment with a
better man-machine interface and flexible and convenient operation.
You can enter or exit the test of one or several refrigerators at
any time without any impact on the refrigerator being tested. Print
the running report or test report of one or more refrigerators at
any time without affecting the refrigerator being tested.
(13) The cooling curve can be displayed and printed.
(14) The temperature test points of adjacent stations can be
borrowed from each other.
(15) When the computer system is powered off and restored, the test
software can be restored to the normal state before the power
failure (with power-down memory function).
(16) Sampling cycle: The sampling rate can be set arbitrarily
between 1s-60s, and the temperature sampling frequency and
electrical parameters can be set separately.
(17) Chinese and English interface display of software version
protection; software display language can be switched freely under
any operating system. Convenient for foreign experts to check and
(18) Privilege: With privilege management, the privileges are set
according to the needs of the user, generally including: system
administrator, equipment administrator, supervisor, tester,
temporary user, etc .;
The test software is finally generated as an exe executable
program, which can be automatically installed and run on the
windows operating system after double-clicking. The complete set of
test software includes a stand-alone version of the application
that is separate from the data acquisition hardware environment.
The interface and functions are consistent with the online version
(as long as a database is available, curves can be generated and
various reports can be output). The data structure of the test
software is compatible with the database structure currently used
by Party A.
The test software runs reliably and can run for a long time. The
calculation methods and calculation formulas involved in the test
software meet the requirements of the standard GB / T8059.
(1) The equipment has abnormal protection devices such as
temperature, pressure, water level, voltage, and current.
(2) Organic materials are flame-retardant.
(3) The safety design of electrical appliances meets the
requirements of relevant national standards.
(4) The power supply of the laboratory station has time-sharing
starting device to prevent the impact of instantaneous high current
on electrical equipment.
Equipment hydropower configuration (provided by Party A to the
laboratory equipment area)
Power supply capacity: three-phase five-wire system, 90kVA;
Circulating cooling water: 20t / h, water pressure is not less than
Tap water: 1m3 / h;
Drainage: Drain floor drain DN50, 1 piece.