Several specific aspects of the compressor design render advanced performance:
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:
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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