Gree GRS-CQ8.0Pd/NaEK - Selection Based on Sanitary Utensils; Selection of the Water Tank; Examples for Model Selection; General Introduction to the Example Project

Design and Selection
35
Villa
Per person, Per day
70~110
60
6.2.2 Selection Based on Sanitary Utensils
Utensil Type
Daily Water
Consumption (L)
Water Temperature (°C)
Bathtub, Sprinkler system (with shower)
150
40
Bathtub, Sprinkler system (without shower)
125
40
Shower
70~100
37~40
Wash Basin
3
30
6. 2.3 Selection of the Water Tank
Selection of the water tank should consider the flow rate of the shower head, duration of use per
person and daily water consumption.
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
Empirical Values for Volume Correction of the Water Tank
Duration of Use
(min/Person)
Flow Rate of the
Shower Head
(L/min)
10
15
20
25
30
40
4
0.48
0.71
0.94
1.18
1.42
1.89
6
0.71
1.06
1.42
1.77
2.12
2.83
8
0.95
1.42
1.89
2.36
2.83
3.77
10
1.18
1.77
2.36
2.95
3.54
4.72
15
1.76
2.65
3.54
4.42
5.31
7.08
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.
7 Examples for Model Selection
7.1 General Introduction to the Example Project
For a two-floor house, there is a master room and a both room 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
and the both room covers 12m
2
.
7.2 Heat Load Calculation
7.2.1 Load Calculation of a Single Floor
Room
Area
Heat Index (W/m
2
)
Heat Load (W)
Master Room
28
82
2296