It consists of two cold rooms, each with their own evaporator but sharing the same cooling flui d R134a system ( compressor, condenser...).

Transcription

1 This system llows study of refrigertion systems implementtion of rmodyn mic clcultions pplied to refrigertion Its uniqueness is tht it is fully controllble vi Internet directly from web browser like Internet Explorer or Firefox It consists of two cold rooms ech with ir own evportor but shring sme cooling flui d R134 system ( compressor condenser ) The control configurtion of this system cn be done in two wys: - clssic console coupled to regultor - PLC type industril PAC (progrmmble utomtion controller) Compct Fieldpoint The Compct Fieldpoint dds possibility of remote control vi Internet viewing evo 1 / 9

2 lution curves of temperture ir refrigernt fluid pressure power t vrious points This llows clculting required cooling system fetures such s enthlpy entropy Mollier digrm performnce coefficients Refrigertion system with control pnel circuit fluid 2 / 9

3 Hrdwre The softwre is embedded in Compct Fieldpoint controller from Ntionl Instruments It in cludes RJ45 Ernet connector tht llows to connect to network in im of uploding executble on controller module to embedded FTP publish shred vribles on network We use Compct Fieldpoint module inputs / outputs nlog relys for sending comms ( strt / stop compressor speed refrigernt solenoid vlves 3 / 9

4 condenser evportor fns lights heters for cold rooms ) nd collect mesurements We mesure power consumed by compressor with power meter included in regultor This regultor communictes only by Jbus protocol So we use RS Compct Fieldpoint controller connect to it n RS 4 / 9

5 - 232 < - > RS -485 converter Jbus communiction functions re progrmmed into controller bsed on Modbus protocol tht is comptible for our use An Ernet 8 relys crd is dded to increse number of relys The refrigertion system with Compct Fieldpoint modules in blue embedding LbVIEW rel 5 / 9

6 -time softwre Also shown on right side doors of two cold rooms Softwre - LbVIEW for progrmming compiling progrm embedded in controller Comp ct Fil edpoint - LbVIEW RT Module for progrmming in LbVIEW embedded trgets with rel-time constrints - Operting system of Compct Fieldpoint controller: Phr Lp ETS IntervlZero (Gro up Citrix ) - HTTP server embedded in Compct Fieldpoint controller to disply directly in web browser ( Firefox Internet Explorer ) GUI controls grphs - FTP server embedded in Compct Fieldpoint controller to downlod executble configurtion files dt 6 / 9

7 Screenshot of GUI softwre progrmmed with LbVIEW embedded in controller module of Compct Fieldpoint controller from Ntionl Instruments You cn ccess this interfce from Internet vi web browser like Google Chrome here How does it work? The user hs option to choose by switch using bench in locl mode with clssicl control pnel or using it in remote mode for exmintion nd regultion by Compct Fieldpoint If remote mode is selected it is possible to visulize ll fetures curves clcultions (entropy enthlpy Mollier digrm performnce coefficients) by connecting vi 7 / 9

8 web browser to controller An LED lights when remote user requests control to chnge temperture settings or sending comms A function llows mesurements recording for export to Excel It is thus possible to relod se recordings to simulte cooling system without mking it work Cn be viewed simultneously from multiple remote sttion 8 / 9

9 but only one cn get control of bench 9 / 9