## 3 Results and Discussion
### The Temperature and Humidity of the Greenhouse without Misting  
Tables 1 and 2, as well as Figures 3 and 4, show the temperature and humidity in the greenhouse without a misting system. Figure 3 shows the temperature inside the greenhouse every hour from 7 a.m. during sunrise to 5 p.m. during sunset. The temperature in the greenhouse was always above 33 \({}^{\circ}\)C, with the highest temperature ranging from \"38.2 \({}^{\circ}\)C\" to \"40.2 \({}^{\circ}\)C\" and occurring from 11 a.m. to 3 p.m.. The greenhouse air temperature increase was in conjunction with the increase in solar heat radiation from 7 a.m. to 2 p.m.. On the other hand, the decrease in air temperature also paralleled the reduction in solar radiation from 2 p.m. to 5 p.m.. It can be concluded that the air temperature was not ideal for mustard greens and watercress, which typically require a temperature not exceeding \"33 \({}^{\circ}\)C\". Meanwhile, Figure 4 shows that the humidity was below 85%. The trends of decreasing humidity from 7 a.m. to 12 p.m., and increasing humidity from 12 p.m. to 5 p.m., resulted from the changes in temperature in the greenhouse. When the air temperature rises, the air can hold more water molecules, causing the humidity to decrease; conversely, if the temperature drops, the air cannot hold water molecules, causing the moisture to increase [12]. The figure of 85% is the maximum humidity limit allowed, which could protect vegetables from disease fungus. As can be seen, the lowest humidity range, between 43% and 50%, occurred from 11 a.m. to 3 p.m.. Although the humidity was conducive to preventing the green mustard and watercress from growing disease fungus, the temperature was too high, rendering the plants unproductive. The solar radiation heats the air in the greenhouse, increasing the temperature and decreasing the humidity. The findings show that the air temperature in the greenhouse rises alongside the increasing solar radiation from morning to afternoon and evening. The  
Figure 4: Greenhouse humidity without the misting system. Figure 3: Greenhouse temperature without the misting system. increase in the temperature is attributed to the hot air trapped in the greenhouse [13]. It suggests that the roof and wall make it challenging to move the trapped air in the greenhouse into the open air. A similar phenomenon was reported by [PERSON] et al., who observed a \"27 m\({}^{2}\)\" greenhouse in Bogor-West Java, Indonesia [14]. Average air temperature data from 7 a.m. to 5 p.m. in the greenhouse without misting, as shown in Table 1 and Figure 3, are used to predict the heat/energy required to reduce the temperature to \"29 \({}^{\circ}\)C\". The heat/energy from Equation (1) plus Equation (2) must be equal to Equation (3). The amount of the mass water flow for misting (m*) from 7 a.m. to 5 p.m. is shown in Table 3. In this case, the mass flow of feed water for misting in Table 3 is calculated based on the intermittent pump work, which is set 5 min ON and 10 min OFF or twenty minutes per hour. The Temperature and Humidity in the Greenhouse with a Misting System with a Flow Rate of \"80 L/h\" and \"60 L/h\"  
Table 3 was a theoretical prediction of determining the mass water flow for misting from 7 a.m. to 5 p.m. Table 3 shows that the mass water flows intermittent misting with five minutes ON and ten minutes OFF requires a water flow rate of \"28.9 kg/h\" to \"78.5 kg/h\". For this reason, we preferred the mass water flow of \"80 L/h\" and \"60 L/h\". Tables 4-7 and Figures 5 and 6 depict temperature and humidity in the greenhouse for the two types of mass water flow.