Diseño de interfaz de control y adquisición de datos para un prototipo didáctico de refrigeración

Abstract

The main objective of this work is to present the design and construction of a control system and data acquisition for a didactic refrigeration prototype, the didactic prototype consists of an evaporation cooling cycle in which it is important to know the voltage variables, current in the compressor, as well as pressure and temperature at each stage of the cycle, in order to understand the thermodynamic phenomena that occur in its operation. The data acquisition and control system reads, registers and displays the voltage, current, temperature and pressure variables on a machine-man interface, in turn it controls the operation of the prototype compressor and fan, when some process variable exceeds the limits permissible. In this system we use the Arduino platform, pressure, voltage, temperature and current sensors as part of the signal acquisition and conditioning system, as a virtual instrumentation environment the LabVIEW software, and a relay module as a power stage to control the outputs of the system. A polynomial regression of 3 orders was used to condition the voltage sensor readings. To verify the operation of the data acquisition system, the readings were compared against measurements of calibrated laboratory equipment.