Refrigeration System

Refrigeration Package is the main equipment for frozen food processing and the cold chain industry, including refrigerating compressors, pressure vessels, electrical elements, and other accessories.

We have hundreds of industrial refrigeration systems around the world. We are also known for designing and building the CO2 cascade, Freon, and Ammonia systems around the world.

We only use internationally recognized refrigeration parts. For example, Compressors are German Bitizer and Japanese Mycom. The valves are Danfoss and Emerson.

  • Computer control, save power
  • Real-time monitoring, alarming, early warning and fault self-diagnosis

  • Compressors use international high-end brands: MYCOM, KOBELCO, BITZER, etc.

  • Compact structure, reliable and simple operation.

  • Intelligent microcomputer control device

Product Features

Why Choose Square's Refrigeration System

Explore the original product feature overview, including Manufacturing Capability, Complete Refrigeration Solution, Flexible selection, and the key technical advantages behind this system.

  • Manufacturing Capability

    All the pressure vessels are built in-house in strict compliance with the American Society of Mechanical Engineers (ASME). Our welders and technicians are ASME certified. We have the state of art plasma welding machines, rollers, and radiography test equipment to ensure the pressure vessels for the refrigeration system are reliable and meet the international pressure vessel codes.

  • Complete Refrigeration Solution

    We provide tailored services from consultation to maintenance. Our experienced team delivers efficient and reliable solutions. With a focus on quality and innovation, we ensure customer satisfaction at every step.

  • Flexible selection

    We only use internationally recognized refrigeration parts. For example, Compressors are German Bitizer and Japanese Mycom. The valves are Danfoss and Emerson.

  • Product Structure

    • The refrigeration system (rack) comprises a compressor, oil separator, oil cooler, control valves and fittings, refrigerant reservoir, condenser, electronic control devices, and PLC control.
    • Internationally renowned compressor and fittings brands include MYCOM, BITZER, KOBELCO, FUSHENG, Danfoss, and Parker.
    • Structural steel base platform with high-efficiency semi-hermetic and open screw compressors.
    • The rack controller acts as the system’s core, managing compressors, condensers, defrost cycles, and other components for stability. It also monitors temperatures to uphold product integrity, requiring no operator intervention during operation.

  • Advantage

    • Integral electric defrost control system.
    • Mechanical and electronic controls for oil, defrost cycles, and liquid levels.
    • Horizontal and vertical receivers with liquid level indicators and pressure relief valves. Insulated suction lines ensure efficiency.
    • Leak-tight construction features preformed tubing, minimal brazed joints, and flare fittings, with units leak-tested at the factory.
    • Pressure vessels can be ASME or PED certified upon request.
    • The PLC touch-screen controller serves as the system’s central control, managing compressors, condensers, defrost cycles, and other rack components to maintain system stability while monitoring temperatures for product integrity.

Technical Specifications

Parameters

Custom dimensions, capacity, and configuration matched to your production requirements.

Compressor type Open-drive reciprocating / Screw (single and twin)
Refrigerants NH₃ (R717) / CO₂ (R744) / Cascade NH₃-CO₂
Evaporating temperature −45°C to +10°C
Condensing temperature +25°C to +45°C (ambient-dependent)
System capacity 50 kW – 5+ MW per system
Condenser type Evaporative / Air-cooled / Shell-and-tube (water-cooled)
Oil system Oil separator, oil cooler, oil management system
Controls PLC with SCADA, compressor sequencing, remote monitoring
Safety Gas detection, emergency ventilation, relief system per EN 378/IIAR
Heat recovery Optional: desuperheater for hot water, oil cooling heat reclaim
Installation Factory-assembled skids or field-erected
Typical lead time 16–22 weeks (custom-engineered system)
Design life 25+ years (pressure vessels); 20+ years (compressors with maintenance)

Design Details

How each subsystem is engineered

Expand any section below for the engineering approach behind each critical subsystem — with links to detailed Technology pages.

NH₃ (Ammonia, R717): The industry standard for industrial refrigeration. Highest thermodynamic efficiency of any common refrigerant. GWP = 0, ODP = 0. Low cost per kg. Classified as B2L (toxic, mildly flammable) — requires safety systems per EN 378. Best for: large systems, low-temperature applications, facilities with existing NH₃ infrastructure.

CO₂ (R744): Growing adoption driven by safety and regulatory trends. Non-toxic, non-flammable (A1 classification). GWP = 1. Excellent low-temperature performance. Higher operating pressures (~40 bar at −5°C vs ~3 bar for NH₃). Best for: facilities where ammonia charge quantity is restricted, indoor equipment rooms, cascade systems with NH₃ on the high side.

Cascade NH₃-CO₂: NH₃ on the high-temperature side, CO₂ on the low-temperature side. Combines NH₃ efficiency with CO₂ safety in occupied spaces. NH₃ charge contained in machinery room; CO₂ circulated to production areas.

Square selects compressor type based on your capacity and operating conditions:

  • Screw compressors: 200 kW–2+ MW per unit. Variable Vi (built-in volume ratio) maintains efficiency at part load. Ideal for medium-to-large systems with varying loads.
  • Reciprocating compressors: 50–300 kW per unit. Excellent part-load efficiency via cylinder unloading. Ideal for smaller systems or where load varies widely.

For facilities with variable production, we configure compressor sequencing and VFD control to maintain efficiency across the full operating range, not just at design conditions.

Industrial refrigeration systems reject large amounts of heat through the condenser. Much of this heat can be recovered:

  • Desuperheater: recovers high-grade heat from compressor discharge gas (70–90°C) for facility hot water
  • Oil cooling heat reclaim: compressor oil cooling heat used for underfloor heating or pre-heating
  • Condenser heat: lower-grade heat (25–35°C) usable for space heating or defrost water pre-heating
  • Typical energy savings: 15–30% reduction in facility heating costs

Ammonia refrigeration systems require comprehensive safety design per EN 378 (Europe) or ASHRAE 15 / IIAR (North America):

  • Continuous gas detection: NH₃ sensors with 25 ppm warning, 150 ppm emergency ventilation activation
  • Emergency ventilation: mechanical ventilation rated for 30 air changes/hour on gas detection
  • Relief valve discharge: piped to safe location, calculated per EN 13136 / ASHRAE 15
  • Emergency shutdown: multiple push-button stations, automatic on high gas concentration
  • Machinery room design: gas-tight construction, outward-opening doors, external light switches

Square provides complete installation supervision and commissioning:

  • Factory-assembled skids reduce on-site work by 40–60%
  • Installation by Square’s 200-person global team or supervised local contractor
  • Pressure testing, evacuation, and refrigerant charging per procedure
  • Full commissioning: performance verification at design conditions
  • Operator training: system operation, safety procedures, daily checks
  • Documentation: P&ID, electrical schematics, safety manual, maintenance schedule

Proven in These Food Applications

  • Freezer Plant

  • Cold Storage

  • Food Processing

  • IQF Lines

    • Frequently Asked Questions

    The refrigeration systems are built with robust components, leak-tight construction, and ASME-certified pressure vessels, tested to withstand harsh working conditions and temperature extremes.

    We use world-renowned compressors such as MYCOM (Japan), BITZER (Germany), and KOBELCO, ensuring performance, durability, and global serviceability.

    We own CE, EAC, INF, CNAS, ISO, ASME, PED, U2, CSA, CRN certifications and 300+ patents, as well as 350+ engineers. Square vertically integrated production ensures quality control from raw materials.

    Square offers customized one-stop cold chain solution that meets your requirements. We specialize in custom-engineered systems, from layout and capacity to refrigerant type and control logic—tailored to your specific project requirements.

    Our engineers will evaluate your project’s safety requirements, temperature range, budget, and environmental considerations to recommend the optimal refrigerant system.

    Case Studies

    Refrigeration System installations in operation worldwide

    Real production lines with performance data — not renderings, not claims. Each installation documented with commissioning data.

    Engineering Inquiry

    Self-Stacking Spiral Freezer installations in operation worldwide

    The more detail you provide, the more precise our engineering response. An engineer — not a sales representative — will review your requirements.

    We typically respond within 1–2 business days. Your information is kept confidential.