R600a (Isobutane) vs R290 (Propane, including VSR290) Quick Reference Table
R600a (isobutane) and R290 (propane) are two mainstream hydrocarbon refrigerants with zero ozone depletion potential (ODP) and ultra-low global warming potential (GWP), widely used in household and commercial refrigeration equipment to replace traditional HFC refrigerants (e.g., R134a, R22). VSR290 is not an independent refrigerant type but a brand-specific designation for high-purity R290, with identical refrigeration characteristics to standard R290. This quick reference table summarizes the key physical parameters, environmental/safety traits, application scenarios and selection criteria of R600a and R290, to assist in rapid and accurate refrigerant selection based on actual application needs.
1. Core Basic Parameters Comparison (Key for Quick Selection)
| Parameter | R600a (Isobutane) | R290 (Propane/VSR290) | Impact on Selection |
|---|---|---|---|
| Boiling Point (1atm) | -11.67°C | -42.1°C | R290 is more suitable for freezing (-18°C below), R600a for refrigeration (0°C above) |
| Critical Pressure | 3.64 MPa | 4.25 MPa | R290 requires higher pressure-resistant systems (piping/compressors) |
| Saturated Vapor Pressure (25°C) | 350.5 kPa | 930 kPa | R290 system pressure is about 2.6 times that of R600a |
| Latent Heat of Vaporization (25°C) | 329 kJ/kg | 427 kJ/kg | R290's cooling capacity per unit mass is 30% higher |
| Typical Charging Amount | 50~100g (household use) | 100~200g (commercial use) | R600a is more suitable for small sealed systems with better safety |
| Energy Efficiency Ratio (EER) | High | Higher (+5%~10%) | R290's energy-saving advantage is more obvious in low-temperature conditions |
2. Environmental & Safety Characteristics (Must-read)
| Characteristic | R600a | R290 (VSR290) | Safety Key Points |
|---|---|---|---|
| ODP/GWP | 0/≈3 | 0/≈3 | Both are environmentally friendly, far superior to R134a (1430) and R22 (1810) |
| Toxicity Class | A (Low toxicity) | A (Low toxicity) | The main risk of leakage is asphyxiation, not toxicity |
| Flammability Class | A3 (Highly flammable) | A3 (Highly flammable) | Both require explosion-proof design; R290 has a lower ignition point (450°C vs 460°C) |
| Explosion Limits (in air) | 1.8%~8.4% | 2.1%~9.5% | R290 has a slightly wider explosion range with higher risk |
| Minimum Ignition Energy | 0.25 mJ | 0.24 mJ | Both are extremely easy to ignite by tiny sparks; fire sources must be eliminated |
3. Application Scenarios & System Compatibility (Direct Decision-making)
| Application Scenario | Recommended R600a | Recommended R290 (VSR290) | Compatible System |
|---|---|---|---|
| Household Refrigerators/Freezers | Mainstream (90%+) | Emerging high-end/commercial | R600a has low charging amount and better safety |
| Light Commercial Refrigeration | Small display cabinets | Large supermarket freezers/cold storage | R290 has larger cooling capacity and higher efficiency |
| Air Conditioners/Heat Pumps | Rarely used | Gradually promoted | R290 is more efficient in medium-high temperature cooling conditions |
| Ultra-low Temperature Equipment | Need to be mixed use | Can be used alone | R290 has lower boiling point, suitable for -40°C below conditions |
| System Renovation | Suitable for R134a systems | Suitable for R22 systems | Both are fully compatible with mineral oil/alkylbenzene oil |
4. Core Selection Decision Guide (One-glance Decision)
| Selection Factor | Choose R600a When | Choose R290 (VSR290) When |
|---|---|---|
| Cooling Temperature | Mainly for refrigeration (0°C above) | Mainly for freezing (-18°C below) |
| Equipment Scale | Small household equipment (refrigerators/small freezers) | Medium commercial equipment (large freezers/supermarket display cabinets) |
| Safety Requirements | Residential environment/sensitive to leakage | Professional maintenance/well-ventilated commercial places |
| Renovation Cost | Upgrading from R134a with low cost | Upgrading from R22 and pursuing high efficiency & energy saving |
| Energy Efficiency Priority | General energy-saving requirements | Ultimate energy saving to reduce long-term operating costs |
5. Key Safety Operation Points (General)
1. Personnel Qualification: Installation and maintenance must be performed by professionally trained personnel.
2. Fire Source Control: Strictly prohibit open flames in the operation area and eliminate static electricity/spark risks.
3. Ventilation Requirements: Ensure good ventilation to prevent accumulation of leaked gas.
4. Leakage Detection: Use special combustible gas detectors to ensure concentration does not exceed the lower explosive limit.
5. System Design: Equipped with explosion-proof components; mixing the two refrigerants is prohibited.
6. Special Notes on VSR290
1. VSR290 is not an independent refrigerant model, but a product name for high-purity R290 by a certain brand.
2. Its refrigeration characteristics are completely consistent with ordinary R290, with differences only in purity and production process.
3. Selection can be performed in accordance with R290 standards.
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