Abstract
To sustain in the ever-changing environment and to combat the atmospheric effect, development of a highly efficient and an environment friendly air conditioning system which can run in parallel or as an alternative to an existing vapor compression system is the need of the hour and such novel hybrid air conditioning system are under development today. For the parameters attribution mapping of such novel hybrid air conditioning system, todays commercially available data acquisition systems (DAS) need to be customized to the requirements of addition of sensor nodes and their integration with triggering mechanism for actuation of devices for its programmed operation. Therefore, this paper describes the design and development of novel multichannel data acquisition system (NMDAS) for automobile air conditioning application. The details of the hardware design, software design, error analysis and testing of the NMDAS are presented. The proposed NMDAS uses PLC module DVP16SP configured with analog reader DVP 04TC for temperature measurement at 32 nodes and DVP04AD for pressure or humidity measurements at 8 nodes. The triggering circuit for activation of the relay is enabled using NI LabVIEW user interface and PLC data. The output of the NMDAS is integrated with processor by RS 232 port for data storage and processing. The error analysis of temperature, pressure and humidity measurements are done by comparing with reference calibration standards. The average thermal stability of the temperature sensors over the operating range of -5˚C to 150˚C is 0.0015°C. The average accuracy of pressure transmitters for operating range of pressure 0 to 40bar is estimated 98.219%. The minimum error in the output current is 0.375% and maximum error is 7.125% over relative humidity span of 0%RH to 100% RH respectively. The proposed NMDAS is used for testing of the novel hybrid air conditioning system of automobile during development stage and is found expedient.
Highlights
For sustainable development of a country depends on growth in its energy utilization and efficient energy recovery
The novel multichannel data acquisition system (NMDAS) is placed inside the vehicle and its temperature and humidity sensors are placed at roof while pressure sensors are placed refrigerant pipes
The NMDAS is found scalable in increasing number of mapping nodes by easy integration of data modules and portable enough to carry in mobile air-conditioning for highway trials
Summary
For sustainable development of a country depends on growth in its energy utilization and efficient energy recovery. For the parameters attribution mapping of such novel air conditioning system todays commercially available data acquisition system (DAS) need to developed further and customized. Results show that cabins comfort temperature of 25oC was achieved after 60 minutes from start of the test Such multiple parameters mapping are recommended using a continuous data acquisition system. Carrera et al [9] developed low cost data logger using Ardino microcontroller for testing indoor air quality and environment. Wang et al [20] developed a prototype data logger using NI LabVIEW integrated with the HP34970 for temperature, pressure and flow measurement in absorption refrigeration circuit. The main gap of use of LabVIEW interface in development of DAS for automobile hybrid air conditioning system has been found in reviewed literatures. The LabVIEW assisted triggering circuit for automation and control of the process parameters of air conditioning is found lacking
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