Walk in high and low temperature wet heat test chamber

The walk-in high and low temperature wet heat test chamber adopts a modular design concept, integrating an efficient cascade refrigeration system, precise humidity control system, and intelligent management platform to ensure accurate environmental simulation in large workspaces.

1、 System architecture

1. Structural system

Box structure: modular assembly structure, reinforced skeleton

Inner wall material: SUS304-2B stainless steel, thickness ≥ 1.2mm

Outer wall material: SUS304-2B stainless steel or cold-rolled steel plate, double-layer epoxy resin spray coating

Insulation layer: high-density rigid polyurethane foam, density ≥ 45kg/m?

Insulation thickness: 120-150mm

Door structure: Double hinged door with air pressure balancing device

Sealing system: EPDM rubber sealing strip, temperature resistance range -60 ℃~+150 ℃

Load bearing design: Reinforced flooring with patterned steel plates, capable of bearing ≥ 1000kg/m?

2. Refrigeration system

Refrigeration cycle: binary cascade refrigeration cycle

Compressor configuration: Multiple semi enclosed piston compressors in parallel

High temperature refrigerant: R404A

Low temperature refrigerant: R23

Condensation method: water-cooled shell and tube condenser

Evaporator: Copper tube aluminum fin heat exchanger

Throttle device: external balanced thermal expansion valve

Oil separation system: high-efficiency cyclone oil separator

3. Heating system

Heating element: Iron chromium aluminum alloy electric heating tube

Installation method: Stainless steel armor, wing arrangement inside the air duct

Control mode: SSR contactless switching, PID continuous adjustment

Power density: stepwise grouping control

4. Humidity system

Humidification method: independent boiler steam humidification

Humidification capacity: adjustable range 1-10kg/h

Dehumidification method: compressor refrigeration dehumidification

Water level control: photoelectric water level sensor

Water quality requirement: electrical resistivity ≥ 0.5M Ω· cm

5. Air circulation system

Fan type: backward centrifugal fan

Motor configuration: Variable frequency speed regulation three-phase asynchronous motor

Air duct design: Venturi effect flow equalization system

Airflow organization: vertical downward air supply, horizontal return air

6. Control system

Main controller: Industrial grade PLC+10.4-inch color touch screen

Temperature and humidity sensor:

Temperature: PT100 platinum resistor, Class A accuracy

Humidity: Capacitive polymer film sensor

Control Algorithm: Fuzzy PID+Feedforward Compensation

Program capacity: 100 sets of programs, with 100 segments per set

Data recording: Sampling interval of 1s-24h can be set

Communication protocols: Modbus TCP/IP, PROFIBUS-DP

2、 Technical parameters

1. Temperature performance

Scope of work: -70 ℃ to+150 ℃

Temperature deviation: ≤± 1.0 ℃ (unloaded)

Temperature fluctuation: ≤± 0.3 ℃ (no load)

Temperature uniformity: ≤ 1.5 ℃ (unloaded)

Heating rate: 3 ℃/min (+25 ℃ →+150 ℃, no load)

Cooling rate: 1.5 ℃/min (+25 ℃ → -70 ℃, no load)

2. Humidity performance

Scope of work: 10% RH to 98% RH

Humidity deviation: ≤± 2.0% RH

Humidity fluctuation: ≤± 1.5% RH

Humidity uniformity: ≤± 2.5% RH

Dew point range: -40 ℃ to+85 ℃

3. Structural parameters

Standard volume: 8m?, 16m? ， 24m? (customizable)

Interior size: customized according to volume (W × D × H)

Power specification: AC380V ± 10%, 50Hz, three-phase four wire+protective ground

Maximum power: Depending on the volume configuration, the typical value is 25-80kW

Cooling water requirements: water temperature ≤ 30 ℃, water pressure 0.2-0.4MPa

3、 Performance indicators

1. Environmental simulation performance

Temperature stability: Continuous operation for 1000 hours, fluctuation ≤ ± 0.5 ℃

Humidity stability: Continuous operation for 1000 hours, fluctuation ≤ ± 2.0% RH

Alternating performance: Temperature and humidity cycling 100 times, performance degradation ≤ 5%

2. Reliability indicators

Average time: ≥ 8000 hours

Average repair time: ≤ 4 hours

Equipment utilization rate: ≥ 95%

3. Security protection system

Electrical safety:

Short Circuit Breaker (MCCB)

Leakage protection device (ELCB)

phase sequence protector

Mechanical safety:

Compressor high/low pressure protection

Compressor overheat protection

Fan overload protection

System security:

Dual independent over temperature protection

Humidifier dry burning protection

Abnormal water level protection

Emergency safety:

Emergency stop button

Emergency lighting system

Safety relief port

Access control interlocking device

4、 Compliant with standards

1. Design standards

GB/T 10586-2006 Technical Conditions for Damp Heat Test Chamber

GB/T 10592-2008 Technical Conditions for High and Low Temperature Test Chambers

IEC 60068-2-1 Test A: Low Temperature

IEC 60068-2-2 Test B: High Temperature

IEC 60068-2-78 Test Cab: Constant Damp Heat

2. Calibration standards

JJF 1101-2019 Calibration Specification for Temperature and Humidity of Environmental Testing Equipment

ISO/IEC 17025 Accreditation Criteria for Testing and Calibration Laboratories

5、 Verification and Confirmation

1. Factory inspection items

Temperature performance test (empty/full load)

Humidity performance test (empty/full load)

Verification of heating and cooling rate

Security protection function testing

Continuous operation test (≥ 72 hours)

Noise test (≤ 75dB)

2. On site verification project

Installation Confirmation

Operational Qualification

Performance Qualification