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In such cases, very common for unit of big capacity, it is necessary to size the plant according to the minimum compressor capacity,
and not in accordance to the full load capacity.
In Tables 3 and 4, the allowed capacities at partial load condition are shown, both for the suction and discharge lines.
Table 3:
Minimum capacity (kW) ensuring the oil flowing in vertical sections of the suction line (R410a refrigerant).
The cooling capacity shown in table 3 refer to 40°C of condensing temperature: in case of different temperature values of the liquid
line, the capacities must be adjusted according to the following factors:
Liquid temperature (°C)
Correction factor
Table 3.a:
Correction factors for different liquid temperature.
Table 4:
Minimum capacity (kW) ensuring the oil flowing in vertical sections of the discharge line (R410a).
In this case also, the cooling capacity shown in table 4 refers to a saturated evaporating temperature equal to -5°C: for different
temperature values the capacity must be adjusted according to the following factors:
Saturated suction temperature (°C)
Correction factor
Table 4.a:
Correction factors for different suction temperature
30
40
1.08
0.91
-20
0.96
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50
0.82
+5
1.02
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