Installation manual

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Investment and Operating Costs 9.3
9.3 Calculation Sheet for Approximate Determination of the Annual
Performance Factor of a Heat Pump System
Table 9.1: Correction factor F
Δυ
for deviating temperature differences at the liquefier
The annual performance factor β of the installed heat pump system is calculated using the simplified short calculation method based on
the correction factors F
operation
(F
υ
) and F
liquefier
(F
Δυ
) according to VDI 4650, as well as using the coefficient(s) of performance (COP)
ε
standard
according to EN 255 as follows:
1. Step: Select the appropriate calculation equation
⇒ i) Determine the type of heat pump
i)
Brine-to-water heat pump Water-to-water heat pump
Air-to-water heat pumps
2. Step: Determine the relevant COP(s) ε
standard
of the heat pump
⇒ i) Determine the design-specific standard operating point(s)
⇒ ii) Use COP(s) measured according to the EN 255 ε
standard
i)
Brine-to-water (B0/W35) Water-to-water (W10/W35) Air-to-water (A-7;2;10/W35)
ii) COP ε
standard 1
: ____________ (at B0/W35 or W10/W35 or A-7/W35)
COP ε
standard 2
: ____________ (only air-to-water heat pumps at A2/W35)
COP ε
standard 3
: ____________ (only air-to-water heat pumps at A10/W35)
3. Step: Determine the correction factor for the deviating temperature difference at the liquefier
⇒ i) Determine the temperature difference Δϑ
M
which was set during the test stand measurement
⇒ ii) Determine the actual temperature difference Δϑ
B
under operating conditions
⇒ iii) Determine the correction factor F
Δυ
using Table 9.1 on p. 205
i) ____________K temperature difference Δϑ
B
at the liquefier under test stand conditions at
Brine-to-water (B0/W35) Water-to-water (W10/W35) Air-to-water (A2/W35)
ii) ____________K temperature difference Δϑ
B
at the liquefier under operating conditions at (see i).
iii) Correction factor F
liquefier
(see Table 9.1 on p. 205): ____________
(Intersection point of Δϑ
M
vertical and Δϑ
B
horizontal)
Temperature difference during the test stand measurement Δυ [K]
3 4 5 6 7 8 9 10 11 12 13 14 15
Temp. difference
during operation [K]
Δυ=3 1.000 0.990 0.980 0.969 0.959 0.949 0.939 0.928 0,918 0.908 0.898 0.887 0.877
Δυ=4 1.010 1.000 0.990 0.980 0.969 0.959 0.949 0.939 0.928 0.918 0.908 0.898 0.887
Δυ=5 1.020 1.010 1.000 0.990 0,980 0.969 0.959 0.949 0.939 0.928 0.918 0.908 0.898
Δυ=6 1.031 1.020 1.010 1.000 0.990 0.980 0.969 0.959 0.949 0.939 0.928 0.918 0.908
Δυ=7 1.041 1.031 1.020 1.010 1.000 0.990 0.980 0.969 0.959 0.949 0.939 0.928 0.918
Δυ=8 1.051 1.041 1.031 1.020 1.010 1.000 0.990 0.980 0.969 0.959 0.949 0.939 0.928
Δυ=9 1.061 1.051 1.041 1.031 1.020 1.010 1.000 0.990 0.980 0.969 0.959 0.949 0.939
Δυ=10 1.072 1.061 1.051 1.041 1.031 1.020 1.010 1.000 0.990 0.980 0.969 0.959 0.949
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