Model Selection Of Generator; Checkup Of Actual Output Capacity Of Each Indoor Unit; Calculation Of Floor Heating Load - Gree GMV-S120WL/A-S Service Manual

(3) Capacity revision coefficient of pipe length and height difference
Upon inquiry, for the corresoponding length of pipe is 30m and height difference between
indoor and outdoor unit is 10m (outdoor unit is in lower position), the revision coefficient is 0.95.
【For specific revision contents of connecting pipe please see related instruction manual】
(4) Calculation of actual capacity of outdoor unit
Actual capacity of outdoor unit=calculated rated capacity of outdoor unit×capacity revision
coefficient of pipe length and height differenct
Actual capacity of outdoor unit=28.6×0.95=27.17kW

8.3.4.4 Checkup of actual output capacity of each indoor unit

(1) Calculate actual output capacity of each indoor unit
Actual output capacity of each indoor unit=actual capacity of indoor unit×rated capacity of
indoor unit/total rated capacity of indoor unit.
In this example, actual output capacity of each indoor unit is as below:
GMV-NHD25PL/A-T：27.17×25/275 = 2.47kW
GMV-NHD36PL/A-T：27.17×36/275 = 3.56kW
GMV-NHD45PL/A-T：27.17×45/275 = 4.45kW
(2) Checkup of capacity of indoor unit
Checkup principle: actual output cooling capacity of each indoor unit is larger or equal to 100%
of heating load of room
Comparison of load of room and indoor unit are as below:
Room A
Load (kW)
Actual output
capacity of indoor 2.47
unit (kW)
From the above sheet we can see that all the model selections for rooms have satisfied the
requirements.
If it cannot satisfy requirement, please calculate from the second step till it satisfies the
requirement.

8.3.5 Model selection of generator

8.3.5.1 Calculation of floor heating load

Select generator according to floor heating load of room; it is required that quantity of
generator should be≤maximum allowable connecting quantity of generator for outdoor unit
Model selection principle is based on floor heating load: outdoor temperature: -3℃DB; water
supply temperature of generator: 40℃.
For defining unit of floor heating load, according to empirical value, floor heating load of
general residences are as below:
Restaurant (W/m
Bedroom (W/m
Guest room (W/m
Study (W/m
Notes:
(1) Generally load of villa is larger than that of recidencial house, take median value to upper
limit value.
(2) Load of top floor of villa should be larger than middle floors or ground floor, take upper
limit value.
GMV5 Home DC Inverter Multi VRF Units
Room B Room C
2 2
2.47
2
)
2
)
2
)
2
)
Room D Room E Room F Room G Room H
3 3
3.56 3.56
Residence
120~150
120~140
130~160
120~140
39
3 3 3
3.56 3.56 3.56
Villa
140~170
130~150
130~160
130~150
4
4.45