Semi-hermetic refrigeration units are a type of refrigeration equipment that falls between fully hermetic and open systems. Their compressor housings can be disassembled for maintenance, combining high sealing performance with ease of maintenance. They are widely used in water chillers, refrigeration systems, and low-temperature quick-freezing equipment, enabling medium- and low-temperature refrigeration with high efficiency. Examples include Bitzer condensing unit screw chillers and Copeland condensing unit piston chillers, which are the mainstream choice for commercial and industrial refrigeration.
Key Features:
Maintainability: Unlike fully hermetic compressors (which are non-removable), the casing of semi-hermetic units can be opened for easy maintenance and replacement of vulnerable parts.
High Efficiency: Excellent energy efficiency under both partial and full loads, such as the Bitzer HS.95 series screw chillers.
Wide Applications: Suitable for a variety of refrigeration applications, including supermarket cold storage, food processing, pharmaceutical freeze drying, and large-scale water chillers.
Low Temperature Capability: Two-stage semi-hermetic units can achieve very low evaporation temperatures (e.g., -50°C to -65°C), suitable for quick-freezing.
Main Types:
Reciprocating Type: Commonly found in brands like Copeland, offering different power ratings, used for medium- and low-temperature refrigeration and freezing.
Screw Type: Such as the Bitzer HS.95 series, suitable for high-power, high-efficiency industrial and process cooling.
Air-cooled/Water-cooled: Units are available in air-cooled and water-cooled condensation methods.
Application Scenarios:
Supermarket refrigeration and freezing;
Logistics warehousing and refrigeration;
Food quick-freezing equipment;
Pharmaceutical freeze-drying;
Industrial process cooling.
Well-known brands:
Copeland condensing unit , Bitzer condensing unit, Dorin condensing unit.
In summary, semi-hermetic refrigeration units play a very important role in the modern refrigeration industry due to their high efficiency, reliability, and ease of maintenance.
Guangxi Cooler Refrigeration Equipment Co.,Ltd.
Tel/WhatsApp：+8613367611012
Email:karen@coolerfreezerunit.com
Post time: Jan-23-2026