Air-to-water Heat Pump Split Versati
14
SPLIT TYPE
2.4 Design Principle
(1)
Cooling: capacity of the unit ≥ cooling load of the air conditioning
(2)
Heating: capacity of the unit ≥ max{ heating load, floor heating load, water heating load}
(3)
Water Tank: it should be selected based on the sanitary outfit or quantity of users. Each unit can
accommodate only one water tank.
3 Selection of the Underfloor Coils
3.1 Calculation of Unit Load for Floor Heating
Empirical Values of Floor Heating Load Per Square Meter
Apartment 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
(a)
Villas whose load is generally larger than the apartments should take the value between the middle and the
maximum empirical values listed above.
(b)
The top layer whose load is generally larger than the middle or bottom layer should take the maximum
empirical value.
(c)
The guest room whose load is generally much larger should take the value between the intermediate and
the maximum empirical values listed above.
(d)
For those whose external walls or glass areas are large, it is recommended to take the load calculation.
(e) The heating load for the bathroom is generally 500W/room.
3.2 Selection of Tube Spacing of the Underfloor Coils
Tube spacing of the underfloor coils which will directly affect heat dissipation of the floor depends on the tube
material, indoor design temperature, supply water temperature and floor 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
3.3.1 Type of Underfloor Coils
When selecting underfloor coils, we should consider both their comfortability and heating capacity. The most
commonly used coils are as shown below.
