The constant temperature and humidity test chamber uses R404A as the medium-temperature refrigerant in a single-stage refrigeration cycle. Its evaporation temperature is -46.5°C at atmospheric pressure (compared to -40.7°C for R22). Typically, the heat transfer temperature difference of the air-cooled condenser is around 10°C, which means the internal chamber can only reach a low temperature of about -36.5°C. However, by reducing the evaporation pressure of the compressor, the minimum evaporation temperature of R404A can be lowered to -50°C. To achieve temperatures below -50°C, a cascade refrigeration system using both a medium-temperature refrigerant and a low-temperature refrigerant is necessary. Usually, R23 is used as the low-temperature refrigerant, with an evaporation temperature of -81.7°C under atmospheric pressure.
The minimum evaporation temperature of a single-stage vapor compression system in such chambers depends mainly on the condensing pressure and the compression ratio. The condensing pressure varies depending on the type of refrigerant and the ambient temperature, typically ranging from 0.7 to 1.8 MPa. As the evaporating temperature decreases, so does the evaporating pressure, increasing the compression ratio. This leads to higher discharge temperatures, thinner lubricating oil, and potentially poor lubrication. In extreme cases, carbon buildup and cylinder pulling may occur. Additionally, a higher compression ratio reduces the gas delivery coefficient, lowers the cooling capacity, and increases power consumption, ultimately reducing the efficiency of the refrigeration system.
These test chambers are widely used in industries such as electronics, automotive, and materials testing. They simulate high and low temperature, and humidity environments to assess the performance and reliability of products during storage, transportation, and use. According to national standards or specific user requirements, they help evaluate the physical properties of products under various environmental conditions. After testing, the results determine whether the product meets its intended specifications, aiding in design improvements, quality control, and factory inspection.
For more information on related equipment, check out:
- High and Low Temperature Alternating Test Chamber: [Link]
- Low Temperature Test Chamber: [Link]
- Temperature Shock Test Chamber: [Link]
Whether you're conducting research, development, or quality assurance, these chambers provide essential tools for ensuring product durability and performance in real-world conditions.
The minimum evaporation temperature of a single-stage vapor compression system in such chambers depends mainly on the condensing pressure and the compression ratio. The condensing pressure varies depending on the type of refrigerant and the ambient temperature, typically ranging from 0.7 to 1.8 MPa. As the evaporating temperature decreases, so does the evaporating pressure, increasing the compression ratio. This leads to higher discharge temperatures, thinner lubricating oil, and potentially poor lubrication. In extreme cases, carbon buildup and cylinder pulling may occur. Additionally, a higher compression ratio reduces the gas delivery coefficient, lowers the cooling capacity, and increases power consumption, ultimately reducing the efficiency of the refrigeration system.
These test chambers are widely used in industries such as electronics, automotive, and materials testing. They simulate high and low temperature, and humidity environments to assess the performance and reliability of products during storage, transportation, and use. According to national standards or specific user requirements, they help evaluate the physical properties of products under various environmental conditions. After testing, the results determine whether the product meets its intended specifications, aiding in design improvements, quality control, and factory inspection.
For more information on related equipment, check out:
- High and Low Temperature Alternating Test Chamber: [Link]
- Low Temperature Test Chamber: [Link]
- Temperature Shock Test Chamber: [Link]
Whether you're conducting research, development, or quality assurance, these chambers provide essential tools for ensuring product durability and performance in real-world conditions.HuiZhou Antenk Electronics Co., LTD , https://www.atkconn.com