AUTOMATIC SYSTEM FOR PSYCHROMETRIC CALCULATIONS
Air psychrometric properties are important in several areas of agricultural engineering, such as calculation of evaluation of the animal environment and air control in grain storage units. Due to their relevance and the complexity and the uncertainties in the use of psychrometric charts, the objecti...
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| Veröffentlicht in: | Engenharia na agricultura 2020-02, Vol.28, p.129-139 |
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| container_title | Engenharia na agricultura |
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| creator | Corraide da Silva, Larissa Carolina Oliveira Filho, Delly Vargas e Pinto, Arthur Caio Diniz Araujo, Matheus Lima |
| description | Air psychrometric properties are important in several areas of agricultural engineering, such as calculation of evaluation of the animal environment and air control in grain storage units. Due to their relevance and the complexity and the uncertainties in the use of psychrometric charts, the objective of this paper was to develop the software, PsyCalculator, which stands out for the automated function that allows presenting the data acquired through sensors and the respective psychrometric properties of the air, either in graph or tables. The automatic data acquisition system consists of a microcontroller that performs readings of sensors that measure the dry bulb temperature and another variable, which may be: wet bulb temperature, relative air humidity or dew point temperature. Then, the values are sent to the PsyCalculator software system. In addition to the values of dry bulb temperature, the software system presents wet bulb temperature and dew point temperature, values of saturation vapor pressure, vapor pressure, mixing ratio, specific volume, enthalpy and degree of saturation. Among the psychometric variables analyzed, the software developed in the study presented a maximum error of 2.14% for the calculation of dew point temperature. The developed software allows the automation of systems that depend on the psychrometric parameters in a friendly and precise fashion. |
| doi_str_mv | 10.13083/reveng.v28i.951 |
| format | Article |
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Due to their relevance and the complexity and the uncertainties in the use of psychrometric charts, the objective of this paper was to develop the software, PsyCalculator, which stands out for the automated function that allows presenting the data acquired through sensors and the respective psychrometric properties of the air, either in graph or tables. The automatic data acquisition system consists of a microcontroller that performs readings of sensors that measure the dry bulb temperature and another variable, which may be: wet bulb temperature, relative air humidity or dew point temperature. Then, the values are sent to the PsyCalculator software system. In addition to the values of dry bulb temperature, the software system presents wet bulb temperature and dew point temperature, values of saturation vapor pressure, vapor pressure, mixing ratio, specific volume, enthalpy and degree of saturation. Among the psychometric variables analyzed, the software developed in the study presented a maximum error of 2.14% for the calculation of dew point temperature. 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| subjects | Agricultural engineering Air temperature Atmospheric pressure Automation Computer programs Data acquisition Data acquisition systems Dew Dew point Enthalpy Error analysis Grain storage Humidity Mathematical analysis Microcontrollers Mixing ratio Relative humidity Saturation Sensors Software Specific volume Storage units Temperature Vapor pressure Vapors |
| title | AUTOMATIC SYSTEM FOR PSYCHROMETRIC CALCULATIONS |
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