Gree Versati II+ - Low-pressure Protection E3; Discharge Temp Protection E4

4
Design & Selection
3 Selection of the Underoor Coils
3.1 Calculation of Unit Load for Floor Heating
Empirical Values of Floor Heating Load Per Square Meter
House W/m
2
Dining Room 100~120
Mater Room 100~110
Guest Room 110~130
Study Room 90~110
Villa W/m
2
Dining Room 110~140
Mater Room 100~120
Guest Room 100~130
Study Room 100~120
Notes
①
Villas whose load is generally larger than the houses should take the value between the middle and the
maximum empirical values listed above.
②
The top lever whose load is generally larger than the middle or bottom layer should take the maximum
empirical value.
③
The guest room whose load is generally much large should take the value between the intermediate and
the maximum empirical values listed above.
④
For those whose external walls or glass areas are large, it is recommended to take the load calculation.
⑤
The heating load for the bathroom is generally 500W/room.
3.2 Selection of Tube Spacing of the Underoor Coils
Tube spacing of the underoor coils which will directly affect heat dissipation of the oor depends on the
tube material, indoor design temperature, supply water temperature and oor material.
Heat Dissipation of Commonly Used Coils
(Tube material: PE-X, Indoor temperature:18°C, Average water temperature:45°C)
Floor Material Thermal Resistance
m
2
·K/W
Tube Spacing
mm
Heat Dissipation
W/m
2
Tube Spacing
mm
Heat Dissipation
W/m
2
Stone 0.02 200 147.0 150 159.8
Wood 0.075 200 111.2 150 117.8
The dissipated heat of the floor coil is larger than the load for the floor heating system; however the
deviation cannot be larger than 10%.
3.3 Selection of Loop Quantity of Coils for Each Room
3.3.1Type of Underoor Coils
When selecting underoor coils, we should consider both their comfortability and heating capacity. The most
commonly used coils are as shown below.
Square-shaped Coil (Recommended)
U-shaped Coil
Length of coils are calculated as below:
Square-shaped coil: =L*W/tube spacing=area/tube spacing
U-shaped coil: =L-1+L*W/tube spacing=L-1+area/tube spacing
The reason why the square-shaped coils are recommended is because they can keep even temperature