Design Principle; Selection Of The Underfloor Coils; Calculation Of Unit Load For Floor Heating; Selection Of Tube Spacing Of The Underfloor Coils - Sinclair S therm Series Service Manual

1.4 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.

2 Selection of the Underfloor Coils

2.1 Calculation of Unit Load for Floor Heating

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 layer 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.

2.2 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.
(Tube material: PE-X, Indoor temperature:18°C, Average water temperature:45°C)
Floor Thermal Resistance
2
Material m
Stone 0.02
Wood 0.075
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%.

2.3 Selection of Loop Quantity of Coils for Each Room

2.3.1 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.
Empirical Values of Floor Heating Load Per Square Meter
Dining Room
Master Room
Guest Room
Study Room
Dining Room
Master Room
Guest Room
Study Room
Heat Dissipation of Commonly Used Coils
Tube Spacing
·K/W mm
200
200
2
House W/m
Villa W/m 2
Heat Dissipation
2
W/m
147.0
111.2
55
100~120
100~110
110~130
90~110
110~140
100~120
100~130
100~120
Heat
Tube Spacing
Dissipation
mm
W/m
150 159.8
150 117.8
2