## 4 Analysis and Discussion of Results  
To reduce energy consumption and emissions, the psychometric condition was initially recalculated between the air return and supply that could linearly reduce the thermal load within the envelope of the new equipment, as the emphasis is on sensible heat; the flow rate was increased to 3400 m\({}^{3}\)/h per unit of equipment. The greenhouse characteristics with recalculated data in a psychrometric condition are shown in Table 8. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Characteristics** & **Air Return Data (Harvest)** & **Air Supply Data** \\ \hline Dry bulb Temperature (\({}^{\circ}\)C) & 19 & 9 \\ Wet bulb temperature (\({}^{\circ}\)C) & 17.30 & 8.2 \\ Dew point temperature (\({}^{\circ}\)C) & 16.06 & 7.13 \\ Enthalpy (kJ/kg) & 52.18 & 27.04 \\ Specific volume (m\({}^{3}\)/kg) & 0.9414 & 0.90 \\ Specific mass (kg/m\({}^{3}\)) & 1.0623 & 1.11 \\ Relative humidity (\%) & 85 & 90 \\ Absolute humidity (g/kg) & 13.04 & 7.146 \\ Airflow (m\({}^{3}\)/h) & 1500 & 1500 \\ \hline \end{tabular}
\end{table} 
Table 7: Psychometric data in the greenhouse. Figure 4: View of the door and thermopaens and inside during the incubation period. With this change, the sensible thermal load per unit remained at 4.7 kW, that is, there was no change in terms of temperature reduction, but the latent heat per equipment was 4.88 kW, a reduction of 28.23%. This reduction in latent heat had the positive effect of reducing the amount of replacement water in the system, which reduced from 10.93 L per hour per unit of equipment to 7.77 L per hour. In general, there was a reduction in the thermal load between the field and the new conditions of 16.7%. In addition to the issue of the new psychrometric characteristics of the AC equipment, another main issue is also the use of a refrigerant gas with a low environmental impact. For the simulation, the refrigerant gas R-454-B was chosen, and experiments have already been carried out with this refrigerant gas to replace the current R-410 A. This refrigerant has an SEER (seasonal energy efficiency index) [49] that is 7% higher than R-410 A [50]. In addition, this refrigerant has a low GWP = 466, as it is based on hydrofluoroolefin (HFO), so it has a low Global Warming Potential [51]. Based on these assumptions, the project using the new equipment was carried out with the individual characteristics shown in Table 9[52; 53]. With these characteristics, using the Chemours Expert 1.0 software [54], the following results were obtained:  
* COP (kW/kW) =4.28;
* Mass flow (kg/s) = 0.0472;
* Compression ratio = 2.7;
* Diameter of the gas line (mm) = 15.82;
* Suction speed (m/s) = 9;
* Liquid line diameter (mm) = 8.09;
* Discharge line speed (m/s) = 1. At the service input of electrical energy for the evaporators, condenser, and condenser fans, the corrected COP was 3.495 kW/kW. In the inoculation condition, the evaporation temperature could be 10 \({}^{\circ}\)C, which could increase the COP, but this option was not used \begin{table}
\begin{tabular}{c c c} \hline \hline
**Characteristics** & **Air Return Data (Harvest)** &
\begin{tabular}{c} **Air Supply Data** \\ **(New Condition)** \\ \end{tabular} \\ \hline Dry bulb Temperature (\({}^{\circ}\)C) & 19 & 14.5 \\ Wet bulb Temperature (\({}^{\circ}\)C) & 17.30 & 14.2 \\ Dew point temperature (\({}^{\circ}\)C) & 16.06 & 13.68 \\ Enthalpy (kJ/kg) & 52.18 & 42.76 \\ Specific volume (m\({}^{3}\)/kg) & 0.9414 & 0.9241 \\ Specific mass (kg/m\({}^{3}\)) & 1.0623 & 1.0821 \\ Relative humidity (\%) & 85 & 97 \\ Absolute humidity (g/kg) & 13.04 & 11.148 \\ Airflow (m\({}^{3}\)/h) & 3400 & 3400 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Greenhouse characteristics with recalculated data in a psychometric condition.