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1. Performance indicators and system composition of the walk-in constant temperature and humidity test chamber

Product Name/Model Step in Constant Temperature and Humidity Test Chamber GC-HH2-30000D

Product Overview

This laboratory can be used to determine the adaptability of electronic products, components, materials, etc. to use and store under high humidity, low humidity, constant humidity, temperature cycling changes, and humidity conditions where condensation occurs on the surface.

This laboratory adopts a reasonable structure and stable and reliable control method, making it aesthetically pleasing, easy to operate, safe, and with high humidity control accuracy. It is an ideal equipment for conducting low humidity tests, constant temperature and humidity tests, and alternating humidity tests.

Outline schematic diagram

Product Name: Walk in Constant Temperature and Humidity Test Chamber

Model GC-HH2-30000G

Sample restrictions: This testing equipment prohibits the testing of flammable, explosive, and volatile substance samples; Testing for storing samples of corrosive substances, testing for storing organisms, testing and storing samples of strong electromagnetic emission sources

Volume, weight, and size

Nominal internal volume 30m3

The effective size of the inner box is 3000 × 2500 × 4000 (mm) (width × height × depth) W × H × D (mm)

The effective size of the outer box is approximately 3500 × 2800 × 5000 (mm) (width × height × depth) W × H × D (mm) (excluding motor height)

Weight approximately 3900kg

Power, current, and power supply

The maximum installed power is about 85KW

The maximum current is about 202A

Power supply conditions and sources

3 ￠ 380VAC ± 10%, 50Hz three-phase four wire+protective grounding

Voltage allowable fluctuation range: 10%

Allowable frequency fluctuation range: (50 ± 0.5) Hz

The grounding resistance of the protective grounding wire is less than 4 Ω

Require users to configure corresponding capacity air or power switches for the equipment at the installation site, and this switch must independently control the use of the equipment

performance index 

Functional requirements: 1. (Air) indoor space cooling, heating, humidification, and dehumidification;

2. According to the temperature and humidity settings, the indoor space reaches the set temperature and humidity

The test environment conditions are a temperature of+25 ℃, a relative humidity of ≤ 85%, and the values measured under the condition of no sample in the test chamber.

Meet the testing standards

Test method 1. GB2423.1-2008/IEC6008-2-1-2007 Environmental testing for electrical and electronic products Part 2: Test methods Test A: low temperature

2. GB/T 2423.2-2008 Environmental testing for electrical and electronic products - Part 2: Test methods - Test B: High temperature

3. GJB150.3A-2009 High temperature test method

4. GJB150.4A-2009 Low temperature test method

5. GB/T 10589-2008 Technical Conditions for Low Temperature Test Chamber

6. GB/T2423.3-2008 (IEC68-2-3) Test Ca: Constant Damp Heat Test Method

7. GJB150.9A-2009 Damp Heat Test Method

8. G/BT 2423.4-2008/IEC6008-2-30:2005 Test Db: Alternating Damp Heat Method

9. GB/T5170.18-2005 Basic parameter calibration method for environmental testing equipment for electrical and electronic products Temperature/humidity combined cycle testing equipment

10. GB/T10586-2006 Technical Conditions for Damp Heat Test Chamber

11. GBT 31467.3-2015 Lithium ion power battery packs and systems for electric vehicles Part 3 Safety requirements and testing methods

Temperature and humidity range

Temperature and humidity range Temperature range:- 70～+150℃

Humidity range: 10-98% RH, corresponding temperature 10~+95 ℃ (as shown in the figure)

Control accuracy temperature resolution: 0.01 ℃

Humidity resolution: 0.01% RH

Temperature deviation: ±1.0℃    

Humidity deviation ≤± 3% R.H. (≥ 75% R.H.) ≤± 5% R.H. (<75% R.H.)

Temperature uniformity: ≤ 1℃ （-40 ～50 ℃） ≤2℃ （50 ～150 ℃）       

Humidity uniformity: ≤ 3%RH

Temperature fluctuation: ± 0.3 ℃

Humidity fluctuation: ± 2% RH

Heating and cooling rate -40 ℃ →+85 ℃, average heating rate throughout the entire process ≥ 5 ℃/min (mechanical refrigeration, with load, average throughout the entire process, measured at the control point in the inlet area)

+The average cooling rate throughout the process from 85 ℃ to -40 ℃ is ≥ 2 ℃/min (mechanical refrigeration, with load, average throughout the process, measured at the control point in the inlet area)

+The average cooling rate throughout the process from 85 ℃ to -40 ℃ is ≥ 5 ℃/min (liquid nitrogen refrigeration, reserved liquid nitrogen holes, with load, average throughout the process, measured at the control point in the inlet area, and liquid nitrogen provided by the user when needed)

Load during heating up: 400KG aluminum ingot.

Load during cooling: approximately 400kg (electronic cabinet communication equipment), size W700 × H1450 × D1300 mm, equivalent to 800kg aluminum ingot+10KW thermal load

Note: The above performance indicators are measured under the conditions of an ambient temperature of+25 ℃, a water temperature of 28 ℃, and a relative humidity of ≤ 85% RH; Temperature uniformity and temperature deviation measured under the condition of no sample

Laboratory structure -6-sided insulation storage board combination assembly structure, with steel frame connection structure inside, and detachable structure connected by hanging buckles between storage boards for easy on-site installation

The exterior material of the warehouse board is cold-rolled steel plate with a thickness of 1.5mm

The interior material of the warehouse board is SUS304 # stainless steel plate, with a thickness of 1.2mm

The insulation material for the storage board is polyurethane rigid foam adhesive with a thickness of 150mm

Bottom plate structure and load-bearing capacity

1. The bottom plate is reinforced and can bear a load of 1500kg/m2 evenly distributed

2. Lay 3mm thick anti slip stainless steel plate at the bottom of the laboratory to increase load-bearing capacity

3. Install drainage holes on the bottom plate of the laboratory

Kumen structure Double door, effective clearance size W2000mm * H2000mm

The material of the door is the same as that of the library body

Imported door lock, internal and external opening type

The door thickness is 150mm, and the insulation material is hard polyurethane foam adhesive

Observation window 1. There are 2 pieces on the laboratory door (1 piece on each door); Window viewing range: W400 * H500mm conductive film explosion-proof, anti fog, anti frost tempered glass observation window, 1.6 meters above the ground.

2. Equipped with conductive film explosion-proof, anti fog, and anti frost tempered glass observation windows, specially customized.

Two test holes, size:& Phi; 100mm, located on the left side of the laboratory (can also be customized according to customer requirements)

The laboratory structure assembly panel is a detachable structure that is convenient for on-site installation, and the bottom channel steel supports the load.

Exterior material color steel plate, plate thickness 2.0mm

Interior material SUS304 # stainless steel plate, plate thickness 2.0mm

The thickness of the warehouse body is 150mm, and the thermal insulation material is rigid polyurethane foam

There are a total of 6 explosion-proof lights on the top of the box, which are resistant to high, low, and humid environments, ensuring that the brightness of the box can be observed at all times to monitor the condition of the products inside.

Door lock Japanese door lock, strong door hinge, with anti lock device

There is a slope at the entrance of the test chamber, which facilitates the entry and exit of customer products. The slope angle is a 20 degree oblique angle, and the overall length of the oblique angle does not exceed 700mm, with a width of 2000mm.

The air conditioning channel is equipped with an air chamber, a circulating air duct and a stainless steel circulating fan. Through the top back leaf window and a diffuser, the air is blown out evenly from the top, and the temperature in the mixing chamber is distributed to the test space, so as to achieve the goal of uniform temperature control

The condensate outlet has outlet holes for studio condensate and unit condensate

Drainage holes: There are drainage ditches and holes at the four corners of the studio to facilitate the smooth discharge of condensed water and other substances

There is an overflow hole located at the bottom of the mechanical room at the rear of the overflow hole to facilitate the outflow of condensed water.

The top of the pressure balance device laboratory is equipped with a pressure balance window to maintain pressure balance inside and outside the working room

The electrical control cabinet is a split type and can be moved within a specific range according to experimental requirements.

Control panel type LCD touch programmable controller

Lighting switch, main power switch, RS-232 communication interface, emergency stop switch

Mechanical room refrigeration unit, exhaust fan, drainage device, steam outlet

Distribution control cabinet main power circuit breaker, controller, distribution board, cooling fan, over temperature protector

The heating system adopts a scale heat dissipation heating tube P I. D controls heating to achieve temperature equilibrium

The heater is made of exposed spiral nickel chromium heating wire and insulated ceramic bracket, with low surface load, sensitive temperature control, and small temperature hysteresis.

Heater control mode: PID+PWM+ SSR， Solid state relays are used for contactless zero crossing triggering to drive heaters, with no contact sparks or noise, and a long service life.

electric control system 

Imported controller, which controls temperature and humidity separately

SAMWON from South Korea, color touch screen control

TEMI1500

Screen display function Temperature and humidity setting (SV) actual (PV) value displayed directly

. It can display the program execution number, segment number, remaining time and number of cycles, as well as the running time

Program editing and graphical curve display

Equipped with a separate program editing screen, each page can input 4 segments of temperature, humidity, and time

Display of fixed-point or program action status

Language conversion can switch between Chinese/English

7.5 True Color Display Screen

Program capacity and

Control function Available program quantity: up to 120 groups, one program can be composed of 1-100 segments, usable memory capacity: 1200 SEGMENT, repeatable command execution: each command can be up to 999 times; The slope setting of the program can be set by the timeline, with a maximum of 99 hours and 99 minutes for each segment between programs, and a minimum of one minute. It can be set to be used in conjunction;

It has functions such as editing, clearing, inserting, etc., 4 sets of time signal output control (controllable control of the ON/OFF action of the test object), 9 sets of PID parameter settings, and program execution with jump and hold functions; The screen can be adjusted for backlight and the backlight time can be set; The screen display protection function can be set to be timed or manually turned off; Program replication, COPY,  Connection function, editing experiment titles and other program editing functions;

PID automatic calculation and FUZZY control function; Equipped with power-off program memory, automatically starts and continues to execute program functions after power restoration; Equipped with scheduled startup and shutdown functions; Equipped with date and time adjustment functions; Button and screen lock (LOCK) function

RS-232

Communication interface Can connect to a computer to display curves and obtain data

Can be used as a monitoring and remote control system

Can be used for synchronous control of multiple machines

Wireless remote control can be achieved through Ethernet to remotely control the start and stop functions of devices

SD memory card is used to store test data and test curves, with a standard storage capacity of 2G and expandable up to 4G

Setting method: Chinese/English interface, touch input

Running mode, program mode/fixed value mode

Set the maximum temperature range with upper and lower limits of 5 ℃

Display resolution temperature: 0.01 ℃; Humidity: 0.1%; Time: 1min;

The power-off memory function can set the power-off recovery mode to: hot start/cold start/stop

The scheduled startup function allows for the setting of the startup time at will, and the machine will automatically run when the power is turned on

Temperature measurement body PT100 platinum resistor

Imported electronic humidity sensor for humidity measurement, precise measurement of real-time relative humidity and feedback of current humidity value to the controller

The curve recording function has RAM with battery protection, which can save the set values, sampling values, and sampling time of the device; The maximum recording time is 60 days (when the sampling period is 1.5 minutes)

Software usage environment: IBM PC compatible machine, CPU with P Ⅱ or above, 128MB or above memory, Simplified Chinese Windows 2000 or Simplified Chinese Windows XP operating system

Set range temperature: Adjust according to the temperature working range of the device (upper limit+5 ℃, lower limit -5 ℃)

Input platinum resistor/DC 1-5V input

Safety protection device

(Standard configuration) Compressor overheating

Compressor overcurrent

Compressor overpressure

Overheating of condensing fan

Abnormal prompt for condenser filter screen

Adjustable Overtemperature

Test space temperature fuse

Extreme overheating of air conditioning channel

Fan motor overheating

Air pressure balance device inside and outside the box

Box door opening (in operation) prompts alarm

Fault alarm and cause, processing prompt function

A fail-safe mechanism 

Upper and lower temperature protection function

Schematic diagram of overall refrigeration unit

Energy saving advantages of hot gas bypass regulation: Different from the cold and hot balance constant temperature method, it adopts professional hot gas bypass regulation technology, which can achieve stepless adjustment of refrigeration output, and low-temperature constant temperature does not require the heating system to be turned on. It can significantly improve the efficiency of the refrigeration system, save energy and reduce consumption. It mainly has the following advantages:

Prevent compressor short circuit cycle

Prevent the compressor from operating at very low suction pressure

Prevent evaporator icing at low loads

Minimize system components

Very good oil return performance

Imported high-precision pressure controller for measuring refrigeration pressure, measuring refrigeration pressure and sending pressure signals to the central controller. The refrigeration system is equipped with sensors to monitor real-time pressure, controlling the start and stop of the compressor and the opening of the solenoid valve through pressure control. Ensuring that the compressor operates under optimal conditions ensures the reliability of the refrigeration system. A cold injection bypass is set up to automatically provide cooling to protect the compressor when the suction temperature of the compressor is too high.

In order to ensure the cooling rate and minimum temperature requirements of the laboratory, a binary duplex refrigeration system is used in this laboratory. The duplex system includes a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and heat exchange is achieved through an evaporative condenser

The refrigeration compressor adopts European imported low-temperature compressors and introduces German refrigeration system diagrams.

Condenser water-cooled heat exchanger

cooling tower 

For the convenience of equipment use, it is recommended to use a chiller for low-noise air-cooled cooling water towers. The chiller should be installed indoors to avoid the problem of water pipe icing in winter. Customers can purchase the chiller themselves or have it configured uniformly by us

water circulating pump

Low noise pipeline pump for strong water circulation

Evaporator finned tube heat exchanger

The stainless steel brazed plate heat exchanger for evaporative condenser is more sturdy and durable when welded with silver.

Throttle device, thermal expansion valve, capillary tube

The programmable logic controller of the refrigeration machine control system automatically adjusts the operating conditions of the refrigeration machine according to the test conditions

Compressor return air cooling circuit

Energy pressure regulating valve

Fully imported refrigeration system

The refrigerant used is the environmentally friendly refrigerant R404a/R23 with an ozone depletion index of 0. This refrigerant is not prohibited by the Montreal Convention, London Amendment, or new US Environmental Protection Agency laws as an environmentally friendly refrigerant (excluding CFCs)

Characteristics of refrigeration system

A、 The entire system pipeline undergoes a leak test with ventilation and pressure of 22kg.

B、 The heating and cooling systems are completely independent.

C、 Equipped with our company's professional technical features, it prevents damage to the system caused by high-temperature and high-pressure airflow in the same flow refrigeration unit.

D、 All freezing system action programs are completely controlled by a microcomputer controller.

E、 There is a water tray at the bottom of the compressor, which can collect the condensed water generated by frosting.

F、 The compressor is equipped with a PTC temperature sensor, which provides over temperature protection when the compressor exceeds the temperature limit.

G、 The compressor is equipped with an oil pressure protector to achieve oil pressure protection.

H、 The high and low pressure protection device monitors the pressure of the refrigerant during the operation of the equipment. Once the refrigerant pressure is higher than the system's limit pressure or lower than the minimum pressure set by the system, an alarm is immediately issued and the power is cut off until the fault is resolved.

I、 The refrigeration system uses imported brand accessories, which are reliable in quality and ensure the stability of the system.

Humidification and dehumidification system

Water replenishment method: three-level filter filtration, water pump lifting automatic water supply, circulating filtration and recycling

The humidification and dehumidification method adopts the external humidification method, and a dedicated dehumidification compressor is used to start dehumidification. The P.I.D controls the humidification amount to achieve the required humidity

The drainage system is hidden at the bottom of the constant temperature box, with a total of 4 drainage holes connected to the main drainage pipeline, as shown in the following diagram.

The humidification and dehumidification method adopts the external humidification method, and a dedicated dehumidification compressor is used to start dehumidification. The P.I.D controls the humidification amount to achieve the required humidity

The water supply quality requires a resistivity of ≥ 500 Ω; m

Security protection system

Project Description

Refrigeration system compressor overheating, overcurrent, overpressure protection, cooling water shortage protection, etc

Test box extreme overheating, fan, motor overheating relay, safety pressure relief device

Humidification system with wet heat pipe dry burning, abnormal water supply, abnormal drainage, and abnormal water shortage

Power leakage protection, overload and short circuit protection

When other alarms are triggered, immediately synchronize the sound and light alarms to remind the laboratory that there is a fault, achieving the purpose of timely warning

Usage conditions

The user guarantees the following conditions:

Environmental conditions for use: 1. The ambient temperature is 5-30 ℃ and the relative humidity is ≤ 85% R.H;

2. The installation site must be a flat and vibration free ground;

3. The equipment should be kept away from heat sources and flammable and explosive substances;

4. The installation location should not be directly exposed to sunlight and maintain indoor air circulation;

5. The equipment installation site needs to be clean and cannot be installed in dusty areas or dust outlets

Requirements for storage environment: The equipment environment temperature should be maintained within 0 ℃ to+45 ℃

When the ambient temperature is below 0 ℃ (when the equipment is stopped for a long time), the remaining water in the equipment should be drained completely to prevent the water in the pipeline from freezing and damaging the pipeline

The installation site requires a flat ground, good ventilation, and no flammable, explosive, corrosive gases or dust; There is no strong electromagnetic radiation source nearby;

Ground bearing capacity of the venue: not less than 600kg/m2;

Leave appropriate maintenance space around the equipment.

A： Not less than 400mm

B： Not less than 400mm

C： Not less than 1000mm

Humidified water supply

1. Water quality: tap water, our company is equipped with a small soft water filter

2. Connection diameter: 4-point tap water pipe.

3. Water supply pressure: 0.1-0.4Mpa

Gas needs to provide CO2 fire extinguishing gas

Product advantages and technical features

1. Utilize a multi-channel, environmentally friendly and energy-saving (low-noise) mechanical compression refrigeration system.

All materials, parts, components, raw materials, etc. of the device, whether domestically produced or imported, are made of environmentally friendly products; Based on the characteristics of mechanical compression refrigeration, a two-stage multi-channel main and bypass system is adopted. The multi-channel main and bypass can be adaptively selected and activated according to different working conditions. The entire control is automatically implemented by an intelligent control system according to the working conditions, changing the traditional way of using a temperature controller to control the heater to offset the cooling capacity to control the cooling capacity. So as to achieve energy-saving effect, not only does the energy consumption account for only 80% of similar products. It also reduces the operating load of the refrigeration compressor, reduces equipment vibration and noise, and improves control accuracy. To achieve better energy-saving effects, frequency conversion technology is adopted to adapt the refrigeration output of the refrigeration compressor to various temperature change rate requirements in the laboratory, while controlling the power loss during use to achieve energy-saving effects. Use sound-absorbing and silencing methods at different locations throughout the structure and mechanical operation process to reduce overall equipment noise

2. Independently developed multi-channel and multi-stage throttling system (refrigeration system).

The refrigeration system of this equipment is designed with different capillary main paths and bypass paths according to different operating conditions. The capillary throttling system is automatically controlled and adjusted by the intelligent communication control system based on the operating conditions to ensure that the flow rate can be adjusted, achieving the purpose of temperature change. Moreover, the temperature field changes uniformly and the temperature fluctuation is minimal.

3. The broadband compression balance temperature control system is applied to achieve rapid temperature control through a fast convergence PID adaptive algorithm.

By using a temperature mixing chamber, a static pressure chamber, and a forced air duct system with centrifugal blades, sufficient exchange of cold and heat is ensured, and air is evenly supplied through the top orifice plate to each space in the working room (experimental area) to achieve temperature uniformity; To achieve rapid temperature convergence, our company has collaborated with Sanyuan Corporation in South Korea to develop a dedicated PID adaptive algorithm suitable for our company. This control method continuously adjusts the control according to the temperature situation during the control process, achieving the control objectives of fast sword retraction, small temperature overshoot, and high stability.

4. Realize remote visual control.

The device is equipped with a human-machine management interface and a touch mode automation control system to achieve automatic control; Simultaneously, connect to remote computers through RS485 communication interface to achieve network management and remote monitoring. The entire system is controlled and managed through a graphical interface, which is simple and fast, with automatic fault prompts. The graphical prompts are energy-saving and provide solutions to guide users in quickly troubleshooting.