ā Evacuated Solar Energy Collector Technical Reference

System pressure drop �p S
Explanation see chapter 5.4
�p
�p
�p
�p
�p
C20
C30
P
he
S
�
�
�
�
�
�
n
20
� �p
[Pa]
[Pa]
[Pa]
[Pa]
C20
[m]
Expansion Vessel
Explanation see chapter 5.5
V
V
V
��
p
p
c
max
d
n
� V
� p
� V
� p
h
sys
( V
�
c
Summary
sys
rv
� � �
�
�V
0.
5
� 0.
1 � h �
� n � �p
30 C
10000
� 0.
015 � 1[
l]
�
��
�
� n
p
col
max
�
�V
col
� p
30
) � ( p
d
�
� 0.
5 �
� 0.
1 �
� �p
max
P
[ l]
� 0.
015 �
� �p
[ bar]
�
he
�1)
(
�
�
[ bar]
[ l]
�1[
l]
Chosen collector Area = [m²]
3
Flow rate VS = [l/min] = [m /h]
Pipe Øi = [mm]
Required head pressure �p S of circulation pump at V S = [m]
Expansion Vessel chosen Volume = [l]
Pre-pressure = [bar]
Max. sys. operating pressure = [bar]
41
�
�
�
�
�
�
�
10000
) � (
Appendix
�
�
�1)
�
[ l ]