What compressor types are used?

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Aurashu’s Integrated Low-Temperature Heating Modular Units use advanced compressor technologies specifically engineered to maintain stable heating capacity under extremely cold ambient temperatures. Because low-temperature air-source heat pumps face significant challenges—such as reduced refrigerant evaporation pressure, increased frost formation, and higher compression ratios—the selection and optimization of the compressor directly determine the unit’s efficiency, reliability, and long-term operating cost.

1. Enhanced Vapor Injection (EVI) Scroll Compressors

The primary compressor type used in most Aurashu low-temperature heating modular units is the EVI scroll compressor. EVI technology introduces a secondary vapor injection cycle to increase mass flow, boost discharge temperature stability, and strengthen heating output even at –25°C to –35°C ambient conditions.

Benefits include:

Higher heating capacity in cold climates compared to standard scroll compressors

Improved COP due to optimized compression ratio

Reduced discharge temperature stress on key components

Stronger frost resistance thanks to stable refrigerant circulation

Smooth, low-noise operation ideal for modular systems

EVI scroll compressors are the best combination of performance, efficiency, and cost for modular low-temperature heat pump applications.

2. Inverter (Variable-Speed) Scroll Compressors

For projects requiring superior part-load performance or ultra-precise temperature control, Aurashu integrates DC inverter scroll compressors. These compressors adjust speed continuously to match actual heating or cooling demand.

Key advantages:

30–50% energy savings at part load

Fewer start–stop cycles, prolonging compressor lifespan

More stable supply water temperature, essential for radiant heating or fan-coil systems

Lower seasonal operating cost (SCOP/SEER improvement)

Aurashu often combines inverter compressors with EVI design to ensure both high efficiency and strong low-temperature heating capability.

3. Twin-Rotary Compressors (Option Based on Capacity)

In specific small-to-medium capacity modules, twin-rotary compressors may be used. They provide smoother rotation and lower vibration, making them suitable for residential and light-commercial modular applications.

Advantages:

Very quiet operation

High stability at low speeds

Good efficiency across broad temperature ranges

Though not as powerful at extreme cold as EVI scroll types, they offer excellent comfort and energy reduction for milder climates.

4. Semi-Hermetic or Hermetic Scroll Compressors (Optional for Large Modules)

For certain high-capacity modular configurations, Aurashu offers heavy-duty scroll or semi-hermetic compressor options. These are designed for:

Higher pressure load

Longer running cycles

Stronger mechanical durability

They are typically paired with optimized heat exchangers and advanced electronic expansion valves for maximum heating output under demanding conditions.

5. Multi-Module Compressor Coordination

A key advantage of Aurashu’s modular architecture is intelligent compressor scheduling across modules.

System logic provides:

Balanced runtime for all compressors

Optimized defrost sequencing

Staged or variable output across multiple modules

Increased redundancy and reliability

Even if one compressor fails, the unit continues operating, ensuring uninterrupted heating during cold seasons.

6. Refrigerant Compatibility and Low-GWP Options

Aurashu compressors support multiple refrigerants depending on project requirements:

R410A for strong low-temperature capacity and stability

R32 for higher efficiency and lower environmental impact

Other low-GWP refrigerants (optional) for future compliance

Compressor design is selected specifically to match refrigerant behavior under cold-climate heating cycles.

7. Why Aurashu Selects These Compressor Types

Aurashu’s design philosophy focuses on maximum reliability, efficiency, and cold-climate performance, which is why the chosen compressor types offer:

Proven durability in sub-zero environments

Long operating life and low maintenance needs

High energy efficiency at both full and part load

Excellent adaptability when multiple modules operate together

These compressor selections ensure that Aurashu’s Integrated Low-Temperature Heating Modular Units consistently deliver heating even under harsh climates, making them suitable for commercial buildings, residential projects, industrial facilities, and multi-block heating systems.

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What compressor types are used?

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