## 4 Tests Description and Data Analysis  
Ten tests were performed during the experimental study. Their descriptions are mentioned in Table 3. The tests were realized to highlight the outlet air affections of the EAHE system on the studied microclimates, its energy consumption, and CO\({}_{2}\) emissions. \begin{table}
\begin{tabular}{c c c} \hline
**Element** & **Technical Specification** \\ \hline \hline \multirow{6}{*}{Fan for air extraction} & Voltage: 230 V \\  & Power: 120 W \\  & (EAHE) Volumetric flow rate: 60, 15 and 5 (m\({}^{3}\) h\({}^{-1}\)) \\  & (GH) Volumetric flow rate: (1, 3 or 12 air change) \(\times\)5 (m\({}^{3}\) h\({}^{-1}\)) \\  & S\&P brand, model TD-800/200 \\  & Single-phase, two-speed motor fed with 230 V voltage \\  & Maximum volumetric flow rate without pressure losses is 1000 (m\({}^{3}\) h\({}^{-1}\)). \\  & S\&P model TD-250/100 T fan \\  & Single-phase, two-speed motor \\  & Max. volumetric flow rate without pressure drop: 240 m\({}^{3}\). h\({}^{-1}\) (Maximum electrical power: 24 W). \\ \hline \hline \multirow{6}{*}{Fan Heaters} & Ceramic fan heater \\  & Digital thermostat \\  & Maximum power of 1800 W \\  & IP21 protection index \\ \hline Power and energy & E2 Classic Electricity Monitor \\  consumption readers & \\ \hline Anemometer & Testo 416 anemometer \\ \hline Temperature and RH & Data logger PCE-T 1200 (PCE instruments) \\ data loggers & Data logger EL-USB-2 (Lascar Electronics) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._ \begin{table}
\begin{tabular}{c c c c} \hline
**Instrument** & **Range** & **Resolution** & **Accuracy** \\ \hline \hline \multirow{2}{*}{Lascar EL-USB-2 data logger} & \(-\)35 \({}^{\circ}\)C to +80 \({}^{\circ}\)C & 0.5 \({}^{\circ}\)C & \(\pm\)0.5 \({}^{\circ}\)C \\  & 0\% to 100\% RH & 0.5\% RH & \(\pm\)2.25\% RH \\ \hline \hline \multirow{2}{*}{PCE-T 1200 data logger} & \(-\)50.0 \({}^{\circ}\)C to +999.9 \({}^{\circ}\)C & 0.1 \({}^{\circ}\)C & \(\pm\)(0.4\% + 0.5 \({}^{\circ}\)C) \\ \hline \multirow{2}{*}{Efergy e2 classic monitor} & 110 V to 600 V & \multirow{2}{*}{-} & \multirow{2}{*}{\(\pm\)10\%} \\  & 50 mA to 90 A & & \\ \hline \hline \multirow{2}{*}{Testo 416 anemometer} & \multirow{2}{*}{0.6 m.s\({}^{-1}\) to 40 m.s\({}^{-1}\).} & 0.1 m.s\({}^{-1}\) & \(\pm\)(0.2 m.s\({}^{-1}\) + 1.5\%) \\ \end{tabular}
\end{table} 
Table 2: Accuracy of the equipment used in the experimental setup. There are three types of affections on the air temperature and humidity of the GH + EAHE microclimate, which are:  
1. the outlet air of the EAHE system,
2. the microclimate air change by the outside air,
3. the heater device. While only the two last types are affecting the GH microclimate. The study is divided into two series, in the A series the heater devices are OFF, and in the B series, the heater devices are ON. During series A and B, the air in the microclimate of the GHs was exchanged by the outside air once, three times, or twelve times, as shown in Table 3. The air exchange was performed in both greenhouses (GH and GH + EAHE) with the same volume flow. Two different fans were used, one in the EAHE circuit and the other one in the air renovation circuit. To regulate the airflow rate fed by these fans the inlet section was reduced using cardboard restrictors previously calibrated with the Testo 416 anemometer. Whenever the tests were performed in a closed loop (normal text style in Table 3), the power consumed by the fan in the EAHE circuit was at a constant value of 48 W. This happened also when in open-loop the airflow rate was set at 60 m\({}^{3}\)/h, because it was the maximum value available in the system (when no cardboard restrictions were used). However, for open-loop (bold text style in Table 3) and 15 m\({}^{3}\)/h airflow rate, the power rose at 62 W, due to the pressure loss imposed by the section restrictors. The coefficient of performance COP is calculated according to Equation (1), where \(\dot{Q}\) is the heating/cooling capacity of EAHE, given by Equation (2), \(\dot{P}\) is the EAHE fan energy input [34].