Daikin EWAD610TZ-SSB2 [6/104] General characteristics

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During chiller operation the working parameters (condensing and evaporating pressure) are subjected to

sensible changes, due to the variations of the ambient temperature and energy demand from the plant,

leadingtoavariablepressureratio(definedascondensingpressureonevaporatingpressure).

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An air cooled chiller equipped with a compressor characterized by high volume ratio will have good

performances at full load with high ambient temperatures, while in case of moderate ambient temperatures

and during part load operation, the actual presure ratio for the chiller will be lower the compressor's

In this case the actual presure ratio for the chiller will be higher the compressor's characteristic, so at the

discharge of the compressor the gas will be at a lower pressure than the condensing pressure. Part of the

refrigerantwillgofromthecondenserbacktothecompressorandthecompressorwillspendadditionalwork

tore-sendittothecondenser.Thisphenomenonisknownas“under-compression”

InordertoobtainthebestefficiencypossibleateveryworkingconditionDaikincompressorscanadjusttheir

owngeometryaccordingtotherealoperatingconditionsenhancingtheefficiency.Thisispossiblethankstoa

movingslidedelaythedischargeofthecompressionaccordingtotheactualoperatingconditions.

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GENERAL CHARACTERISTICS