Sanyo SGP-E120J2GU2, User Manual

Page: 48 / 175

Design
D - 4
1. System Configuration
Indoor unit cooling capability
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1
Outdoor unit rated cooling capacity =22.4(kW)
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3
Indoor unit rated cooling capacity
Type 28 2.8kW, type 36 3.6kW, type 45 4.5kW, type71 7.1kW, type 112 11.2kW
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5
Total rated cooling capacity of the indoor units=29.2(kW)
2.8+3.6+4.5+7.1+11.2=29.2
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7
From the performance table, the correction factor for temperature and connected capacity=1.186
The connected capacity of the indoor units as a percentage of the outdoor capacity is (29.2÷22.4)×100R”130%.
This is within the range 50-200%, so from the table for 130% capacity, the cooling performance when the indoor wet bulb
temperature is 22
o
CWB and the outdoor air temperature is 33
o
CDB is 118.6%.
Divide this by 100 to obtain 1.186.
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8
The correction factor for piping length is=0.76
From the “Performance change rate due to refrigerant piping length graph” for the design unit, for an effective length of
121m and difference in height of the outdoor unit and indoor unit of 50m the crossover point is 76%. Divide by 100 to
obtain 0.76.
1) Cooling capacity for each indoor unit
Type 28 indoor unit cooling capacity =
❋
1
×
❋
3
÷
❋
5
×
❋
7
×
❋
8
= 22.4×2.8÷29.2×1.186×0.76
1.9kW
Calculated in the same way, the type 36 is 2.4kW, type 45 is 3.1kW, type 71 is 4.9kW, type 112 is 7.7kW.
2) The total cooling capacity of the indoor units is 20.0 (1.9+2.4+3.1+4.8+7.6)kW.
Indoor unit heating performance
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2
Rated heating capacity of the outdoor unit=26.5(kW)
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4
Indoor units rated heating capacity
Type 28 3.4kW, type 36 4.2kW, type 45 5.3kW, type 71 8.5kW, type 112 13.2kW
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6
Total rated heating capacity of the indoor units =34.6(kW)
3.4+4.2+5.3+8.5+13.2=34.6
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7
From the performance table, the correction factor for temperature and connected capacity is =1.004
Selection of the indoor units was based upon the cooling capacity, so the connected capacity of the indoor units as a
percentage of the outdoor unit capacity is (29.2÷22.4)×100 130%. This is within the range that can be connected 50-
200%. From the heating performance capacity table for 130% for indoor dry bulb temperature 22
DB and outdoor air temperature 3
o
CDB, the value 100.4% is obtained. Divide this by 100 to obtain 1.004.
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8
The correction factor for piping length is=0.962
From the “Performance change rate due to refrigerant piping length graph” for the design unit, for an effective length of
121m and difference in height of the outdoor unit and indoor unit of 50m, the crossover point is 96.2%. Divide by 100 to
obtain 0.962.
1) Heating capability of each indoor unit
Type 28 indoor unit heating capability =
❋
2
×
❋
4
÷
❋
6
×
❋
7
×
❋
8
=28×3.4÷34.6×1.004×0.962
2.7kW
Calculated in the same way, the type36 is 3.3kW, type45 is 4.1kW, type 71 is 6.6kW, type 112 is 10.3kW.
2) The total heating capability of the indoor units is 27.0 (2.7+3.3+4.1+6.6+10.3)kW.