Analyzing the Performance of a Temperature and Humidity Measuring System of a Smart Greenhouse for Strawberry Cultivation

Abstract

This study compared the temperature and humidity measured by an aspirated radiation shield (ARS), the accuracy of which has been recently verified, and those measured by a system developed by the parent company (Company A) to investigate and improve the performance of the developed system. The results are as follows. Overall, the two-plate system had a lower radiation shielding effect than the one-plate system but showed better performance results when excluding the effect of strawberry vegetation on the systems. The overall maximum temperature ranges measured by company A’s system and the ARS were 20.5~53.3C and 17.8~44.1C, respectively. Thus, the maximum temperature measured by company A’s system was 2.7~9.2C higher, and the maximum daily temperature difference was approximately 12.2C. The overall average temperature measured by company A’s system and the ARS was 12.4~38.6C and 11.8~32.7C, respectively. Thus, the overall average temperature measured by company A’s system was 0.6~5.9C higher, and the maximum daily temperature difference was approximately 6.7C. The overall minimum temperature ranges measured by company A’s system and the ARS were 4.2~28.6C and 2.9~26.4C, respectively. Thus, the minimum temperature measured by company A’s system was 1.3~2.2C higher, and the minimum daily temperature difference was approximately 2.9C. In addition, the overall relative humidity ranges measured by company A’s system and the ARS were 52.9~93.3% and 55.3~96.5%, respectively. Thus, company A’s system showed a 2.4~3.2% lower relative humidity range than the ARS. However, there was a day when the relative humidity measured by company A’s system was 18.0% lower than that measured by the ARS at maximum. In conclusion, there were differences in the relative humidity measured by the two company’s devices, as in the temperature, although the differences were insignificant. Additional key words : aspirated radiation shield, numbers of plates, relative humidity, solar radiation, temperature