Examples For Model Selection; General Introduction To The Example Project; Heat Load Calculation - Sinclair S therm Series Service Manual

Volume of the Water Tank=
t (design temperature): generally it is 60°C ;
t (entering cold water temperature): it differs for different regions;
t ( water tank temperature set point): it is the target heating temperature of the water tank.
α: correction factor
Duration of Use
Flow Rate of the
Shower Head
(L/min)
4
6
8
10
15
Empirical values are worked out under conditions of 80L consumption (per day per person), 8L/min flow rate of
the shower head, and 10 minutes use duration per person.

6 Examples for Model Selection

6.1 General Introduction to the Example Project

For a two-floor house, there is a master room and a bathroom for each floor and both of them require floor
heating. Other rooms use the heat pump for heating in winter. The master room covers 28m
2 .
covers 12m

6.2 Heat Load Calculation

6.2.1 Load Calculation of a Single Floor
Room
Master Room
Bathroom
Total Load
6.2.2 Arrangement Design of the Underfloor System for A Single Floor
Assumed conditions: the floor is cement or ceramics, the normal external diameter of the heating pipe is 20mm,
thickness of the stuffer is 50mm, thickness of PS foam insulation is 20mm, supply water temperature is 45°C,
return water temperature is 35°C, indoor design temperature is 20°C.
6.2.3 Arrangement Design of the Underfloor System for the Bath Room
Heat load of the bath room is 900W, heat dissipation per unit area is 75W/m
30mm, and heat loss is 25.4 W/m
Based on the heat load listed in the table above, the heating load for the bathroom is:
According to the formula Q=CρGΔT, the flow rate of the heating pipe for the bathroom is:
t(design temperatuere)-t(entering cold water temperatuere)
t(water tank temperatuere set point)-t(entering cold water temperature)
Empirical Values for Volume Correction of the Water Tank
(min/Person)
10
0.48
0.71
0.95
1.18
1.76
Area
28
12
Average Temperature of the Heating Pipe=(45+35)/2=40°C
2
, then the total heat loss is:
25.4×12=304.8W
900+304.8=1204.8W
15 20
0.71 0.94
1.06 1.42
1.42 1.89
1.77 2.36
2.65 3.54
Heat Index (W/m
82
72
2296+900=3196W
60
•consumption
25 30
1.18 1.42
1.77 2.12
2.36 2.83
2.95 3.54
4.42 5.31
2
and the bathroom
2
) Heat Load (W)
2296
900
2
, tube spacing of the heat pipe is
40
1.89
2.83
3.77
4.72
7.08