## 2 Methods
### LCA Methodology
#### 2.3.7 LCIA of the Operational Stage  
The LCIA of the operation stage are presented in Table 9 for the reference and in Table 10 for the innovative one.  
\begin{table}
\begin{tabular}{l c c c c} \hline \hline  & **Mass** & **ReCiPe** & **GWP 100a** & **GWP 20a** \\ \cline{2-5}
**Element** & **(kg)** & **Impact/m\({}^{2}\) Floor** & **kgCO\({}_{2}\)-eq /m\({}^{2}\)** & **kgCO\({}_{2}\)-eq /m\({}^{2}\)** \\ \hline
**Heat pump** & & & & \\ Compressor & 10 & 0.030 & 0.061 & 0.061 \\ Controller & 2 (unit) & 0.094 & 0.191 & 0.221 \\ Inverter & 3.3 (unit) & 0.172 & 0.281 & 0.331 \\ Expansion valve & 2 & 0.045 & 0.001 & 0.001 \\ Heat exchanger-evaporator & 26.4 & 0.298 & 0.461 & 0.571 \\
4-Way valve & 2 & 0.036 & 0.011 & 0.001 \\ Refrigerant R32 & 7 & 0.031 & 0.311 & 0.461 \\ Expansion vessel & 9.6 & 0.152 & 0.331 & 0.381 \\ Heat exchanger-condenser & 11.4 & 0.035 & 0.061 & 0.081 \\ Electric heater & 2.4 & 0.007 & 0.001 & 0.021 \\ Manual 2-way valve & 0.8 & 0.099 & 0.021 & 0.031 \\ Circulating pump & 9.4 & 0.029 & 0.051 & 0.061 \\ Diverter 3-way valve & 2 & 0.249 & 0.061 & 0.070 \\ Hydraulic separator & 14.4 & 0.044 & 0.08 & 0.100 \\ Security valve & 0.12 & 0.015 & 0.001 & 0.001 \\ Flow rate sensor & 2 (unit) & 0.009 & 0.001 & 0.001 \\
**Electric storage** & & & & \\ Electric battery & 168.8 & 2.564 & 2.364 & 2.873 \\ DC-DC converter & 60 & 1.338 & 0.346 & 0.386 \\ AC-DC converter & 75 & 1.673 & 0.432 & 0.482 \\ Electric controller (PLC) & 0.75 & 0.017 & 0.004 & 0.005 \\ Current transducer & 1.08 & 0.024 & 0.006 & 0.007 \\ Line filter & 2.7 & 0.336 & 0.080 & 0.094 \\ Fuses & 0.24 & 0.030 & 0.007 & 0.008 \\ Aux power supply & 1.125 & 0.025 & 0.006 & 0.007 \\ Grid monitoring & 0.54 & 0.012 & 0.003 & 0.003 \\ LED indicators & 0.375 & 0.008 & 0.002 & 0.002 \\ Insolation monitoring & 0.585 & 0.001 & 0.002 & 0.002 \\ Connectors & 0.18 & 0.004 & 0.001 & 0.001 \\ Time delay relay & 0.105 & 0.013 & 0.003 & 0.004 \\ Power relay & 1.29 & 0.160 & 0.038 & 0.045 \\ Relays & 0.45 & 0.056 & 0.013 & 0.016 \\ Grid contactor & 1.26 & 0.028 & 0.007 & 0.008 \\ DC contacts & 4.5 & 0.100 & 0.026 & 0.029 \\ Battery contactor & 7.8 & 0.005 & 0.025 & 0.033 \\ Circuit breakers + aux & 8.4 & 0.187 & 0.048 & 0.054 \\ Precharge resistor & 0.015 & 0.001 & 0.001 & 0.001 \\ Switches & 1.2 & 0.149 & 0.036 & 0.042 \\ Smart meters & 0.45 & 0.056 & 0.013 & 0.016 \\ Ethernet switch & 0.42 & 0.052 & 0.012 & 0.015 \\ Terminal blocks & 1.26 & 0.157 & 0.037 & 0.044 \\ Electric cabinet + acc. & 45 & 1.004 & 0.259 & 0.289 \\ DIN rail & 7.2 & 0.161 & 0.042 & 0.046 \\ Wires & 45 & 1.004 & 0.259 & 0.289 \\ Screws & 9 & 0.201 & 0.052 & 0.058 \\ Nuts & 4.5 & 0.560 & 0.134 & 0.156 \\ Washers & 1.5 & 0.187 & 0.045 & 0.052 \\ Slotted Wiring Duct & 2.25 & 0.050 & 0.013 & 0.014 \\ Strain relief bar & 0.03 & 0.001 & 0.001 & 0.001 \\
**Latent storage** & & & & \\ RPW-HEX & 330 & 3.727 & 5.735 & 7.148 \\ Paraffin & 120 & 0.060 & 0.160 & 0.171 \\
**Sensible storage** & & & & \\ Domestic hot water tank & 6.7 (unit) & 4.423 & 10.235 & 11.933 \\
**PV panels** & & & & \\ PV panels & 96 (m\({}^{2}\)) & 2.039 & 9.031 & 10.708 \\ \hline \hline \end{tabular}
\end{table}
Table 8: LCIA of the innovative system during manufacturing/disposal stage.