More About Features of VZH 4-7TR

  • VZH044 with CDS803 drive
  • Several specific aspects of the compressor design render advanced performance:

    • optimization for varying pressure ratios with Intermediate Discharge Valves (IDVs) and modes,
    • permanent magnet motor technology, 
    • wide capacity modulation, 
    • compact and reliable design. 

    Optimization for varying pressure ratios and modes:
    Small scrolls VZH feature Intermediate Discharge Valves (IDVs). The IDVs inside the small platform are decisive to the system efficiency. 

    The isentropic efficiency of a scroll compressor reaches a maximum at the built-in pressure ratio. When a compressor is operating below this built-in pressure ratio the efficiency drops due to overshoot: the discharge gas is at a pressure above the condensing pressure, the compressor over compresses the refrigerant. The IDVs in the 4-7TR models partially avoid over-compression as they release the refrigerant before the built-in pressure ratio. This early release avoids efficiency losses due to overshoot and thus significantly enhance the energy efficiency for A/C systems at part-load conditions.

    The wide operating map makes the compressor suitable for very varied cooling and for heating applications, from 3 to 25kW of heating capacity.

    Permanent magnet motor:
    The efficiency comparison between asynchronous and synchronous motors shows instantaneously the great advantages obtained when using a permanent magnet motor technology with:

    • Uniform motor efficiency in operation always above 92%. This leads to a lower power consumption, 
    • Coolant stays cooler: the motor being more efficient, it will transfer less heat to the refrigerant and thus enhanced the compression efficiency. 

    Wide capacity modulation:
    The inverter drive modulates the cooling capacity from 15% to 100% with a single compressor, which is very relevant for a variety of demanding applications where low part loads are needed.

    Compact and reliable design:

    The 3 compressor displacements have the same dimensions and a compact footprint. This allows a cost effective and flexible design over a wide range of cooling capacities.
    Furthermore, the IDVs significantly reduce the stress level on mechanical components at start-ups.

     

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