@article{MAKHILLJEAS2018131416572,
    title = {Cascade Control Loop Implementation in a Vapor Compression
Refrigeration System Using LabVIEW®},
    journal = {Journal of Engineering and Applied Sciences},
    volume = {13},
    number = {14},
    pages = {5820-5825},
    year = {2018},
    issn = {1816-949x},
    doi = {jeasci.2018.5820.5825},
    url = {https://makhillpublications.co/view-article.php?issn=1816-949x&doi=jeasci.2018.5820.5825},
    author = {Naissir,Guillermo and},
    keywords = {vapor compressor refrigeration systems,cascade controller,PID controller,transfer,condenser,temperature},
    abstract = {This study presents a cascade control system implementation to regulate the outlet temperature in
a evaporator of a vapor compression refrigeration systems which is integrated by an evaporator, a compressor,
the expansion valve and the condenser. The equipment is partially instrumented with 4 temperature sensors
and 4 pressure sensors, connected to the NI USB 6210 and NI USB 6008 data acquisition that allows manipulate
the fans speed in the condenser and evaporator heat exchanger. The transfer functions of heat exchangers was
approximated to a first order plus dead time in order to study the evaporator outlet temperature and the faster
dynamic in the condenser outlet temperature for inner loop which allowed to design and tune the PID
controllers through the Ziegler-Nichols method for the primary controller and the Austin tuning laws for the
secondary controller. Finally, the performance controllers was evaluated using the integral of absolute value
of error indicator, resulting the P-PI cascade controller under changes of set point whit comparative advantages
rather than PI controller.}
    }