PESHEAT2V01
2016-01-08
41
Annex A
Application type
Energy calculation formula
For closed heating/cooling systems
U1L
– Meter for heating and cooling.
The flow sensor in flow pipe
∑E = E1 + E2
kai Θ1 > Θ2:
E1=V1
1
(h
T1
-h
T2
), E2=0
kai Θ1< Θ2:
E2=V1
1
(h
T2
-h
T1
), E1=0
M1 =V1
1
U2L
- Meter for heating and cooling.
The flow sensor in return pipe
∑E = E1 + E2
kai Θ1 > Θ2:
E1=V1
2
(h
T1
-h
T2
), E2=0
kai Θ1< Θ2:
E2=V1
2
(h
T2
-h
T1
), E1=0
M1 =V1
2
For closed or opens heating systems
A
– For closed heating system with flow sensor in
flow pipe or or open heating system with the cold
water temperature measurement and with two flow
sensors, installed in flow and return pipes
∑E = E1 - E2 *
E1=V1
1
(h
T1
-h
T3
)
E2=V2
2
(h
T2
-h
T3
)
M1 =V1
1
M2 =V2
2
T3
T1
T2
A
V2
p2
V3
V4
V1
p1
T1
T2
U2L
V1 p2
V3
V4
p1
T1
T2
U1L
p2
V3
V4
V1
p1
