Computer Controlled Geothermal Energy Unit with Two-Well System
The Computer Controlled Geothermal Energy Unit with Two-Well System, "EGTWC", is a laboratory scale unit designed to study a two-well system used for the exploitation of thermal energy stored under the Earth’s surface.
The main element is a tank with one working section and two side chambers, one for the inlet and the other for the outlet of water. The sand bed through which the groundwater flows is located in this tank. Its flow can be adjusted by height-adjustable overflows. The groundwater level in the working section can be visualized by manometric tubes.
It is a self-contained unit with a water supply tank (groundwater simulation) from which a computer controlled pump drives the water to the sand bed chamber. Before entering the supply chamber, the water is heated by a computer controlled heating element, allowing to control the groundwater temperature.
The water crosses the working section, where there is a two-well system, a production and an absorption one. In the production well, water is pumped into a plate heat exchanger to transfer its thermal energy to an external flow (working fluid). The flow of groundwater pumped to the exchanger can be adjusted and the unit has the measurements of flows and temperatures of both currents allowing the realization of the energy balance.
The working fluid flow to be heated in the exchanger can be tap water from the laboratory or water from EDIBON recommended element "TERA", suitable to work with this unit.
At the exit of the exchanger, water flows towards the bottom of the absorption well, leaving the working section towards the supply tank through the outlet chamber.
This Computer Controlled Unit is supplied with the EDIBON Computer Control System (SCADA), and includes: The unit itself + a Control Interface Box + a Data Acquisition Board + Computer Control, Data Acquisition and Data Management Software Packages, for controlling the process and all parameters involved in the process.
With this unit there are several options and possibilities:
- Main items: 1, 2, 3, 4, 5 and 6.
- Optional items: 7, 8, 9, 10 and 11.
Let us describe first the main items (1 to 6):
1. EGTWC. Unit:
Anodized aluminum frame and panels made of painted steel.
The unit includes wheels to facilitate its mobility.
Main metallic elements made of stainless steel.
Diagram in the front panel with distribution of the elements similar to the real one.
Sand bed tank, made of transparent material and dimensions of 1700 mm x 300 mm x 500 mm. It includes:
Inlet and outlet chambers.
Working section with:
Production well with adjustable submersible pump.
Manometric tubes to visualize the groundwater level.
"J" type temperature sensor.
Supply tank with a capacity of 150 l.
Level switch in the supply tank.
Computer controlled pump to impel groundwater.
Computer controlled heating element; Power: 8 kW.
"J" type temperature sensor to measure the temperature of the water flow entering the sand bed tank.
Plate heat exchanger:
No. of plates: 30.
Heat transfer surface: 0.4 m².
Four "J" type temperature sensors to measure the temperature at the inlet and outlet of the exchanger.
Flow sensor to measure working fluid (external flow), range: 0 – 30 l/min.
Flow sensor to measure groundwater, range: 3 – 50 l/min.
Flow sensor to measure water impelled from the production well, range: 0 – 30 l/min.
The complete unit includes as well:
Advanced Real-Time SCADA.
Open Control + Multicontrol + Real-Time Control.
Specialized EDIBON Control Software based on LabVIEW.
National Instruments Data Acquisition board (250 KS/s, kilo samples per second).
Calibration exercises, which are included, teach the user how to calibrate a sensor and the importance of checking the accuracy of the sensors before taking measurements.
Projector and/or electronic whiteboard compatibility allows the unit to be explained and demonstrated to an entire class at one time.
Capable of doing applied research, real industrial simulation, training courses, etc.
Remote operation and control by the user and remote control for EDIBON technical support, are always included.
Totally safe, utilizing 4 safety systems (Mechanical, Electrical, Electronic & Software).
Designed and manufactured under several quality standards.
Optional ICAI software to create, edit and carry out practical exercises, tests, exams, calculations, etc. Apart from monitoring user's knowledge and progress reached.
This unit has been designed for future expansion and integration. A common expansion is the EDIBON Scada-Net (ESN) System which enables multiple students to simultaneously operate many units in a network.
2. EGTWC/CIB. Control Interface Box:
The Control Interface Box is part of the SCADA system.
Control interface box with process diagram in the front panel and with the same distribution that the different elements located in the unit, for an easy understanding by the student.
All sensors, with their respective signals, are properly manipulated from -10V. to +10V. computer output.
Sensors connectors in the interface have different pines numbers (from 2 to 16), to avoid connection errors.
Single cable between the control interface box and computer.
The unit control elements are permanently computer controlled, without necessity of changes or connections during the whole process test procedure.
Simultaneous visualization in the computer of all parameters involved in the process.
Calibration of all sensors involved in the process.
Real time curves representation about system responses.
Storage of all the process data and results in a file.
Graphic representation, in real time, of all the process/system responses.
All the actuators’ values can be changed at any time from the keyboard allowing the analysis about curves and responses of the whole process.
All the actuators and sensors values and their responses are displayed on only one screen in the computer.
Shield and filtered signals to avoid external interferences.
Real time computer control with flexibility of modifications from the computer keyboard of the parameters, at any moment during the process.
Real time computer control for pumps, compressors, heating elements, control valves, etc.
Real time computer control for parameters involved in the process simultaneously.
Open control allowing modifications, at any moment and in real time, of parameters involved in the process simultaneously.
Three safety levels, one mechanical in the unit, another electronic in the control interface and the third one in the control software.
3. DAB. Data Acquisition Board:
The Data Acquisition board is part of the SCADA system.
PCI Express Data acquisition board (National Instruments) to be placed in a computer slot. Bus PCI Express.
Number of channels= 16 single-ended or 8 differential. Resolution=16 bits, 1 in 65536.
Sampling rate up to: 250 KS/s (kilo samples per second).
Input range (V)=±10 V. Data transfers=DMA, interrupts, programmed I/0. DMA channels=6.
Number of channels=2. Resolution=16 bits, 1 in 65536.
Maximum output rate up to: 900 KS/s.
Output range (V)=±10 V. Data transfers=DMA, interrupts, programmed I/0.
Number of channels=24 inputs/outputs. D0 or DI Sample Clock frequency: 0 to 100 MHz.
Timing: Number of Counter/timers=4. Resolution: Counter/timers: 32 bits.
4. EGTWC/CCSOF. Computer Control + Data Acquisition + Data Management Software:
The three softwares are part of the SCADA system.
Compatible with actual Windows operating systems. Graphic and intuitive simulation of the process in screen. Compatible with the industry standards.
Registration and visualization of all process variables in an automatic and simultaneous way.
Flexible, open and multicontrol software, developed with actual windows graphic systems, acting simultaneously on all process parameters.
Management, processing, comparison and storage of data.
Sampling velocity up to 250 KS/s (kilo samples per second).
Calibration system for the sensors involved in the process.
It allows the registration of the alarms state and the graphic representation in real time.
Comparative analysis of the obtained data, after the process and modification of the conditions during the process.
Open software, allowing the teacher to modify texts, instructions. Teacher’s and student’s passwords to facilitate the teacher’s control on the student, and allowing the access to different work levels.
This unit allows the 30 students of the classroom to visualize simultaneously all the results and the manipulation of the unit, during the process, by using a projector or an electronic whiteboard.
5. Cables and Accessories, for normal operation.
This unit is supplied with 8 manuals: Required Services, Assembly and Installation, Interface and Control Software, Starting-up, Safety, Maintenance, Calibration & Practices Manuals.
References 1 to 6 are the main items: EGTWC + EGTWC/CIB + DAB + EGTWC/CCSOF + Cables and Accessories + Manuals are included in the minimum supply for enabling normal and full operation.TENDER SPECIFICATIONS (for optional items)
a) Industrial configuration
7 PLC. Industrial Control using PLC (it includes PLC-PI Module plus PLC-SOF Control Software):
-PLC-PI. PLC Module:
Circuit diagram in the module front panel.
Digital inputs (X) and Digital outputs (Y) block: 16 Digital inputs. 14 Digital outputs.
Analog inputs block: 16 Analog inputs.
Analog outputs block: 4 Analog outputs.
High-speed scan of 0.32 µsec. Program capacity of 32 Ksteps. High-speed counter. Multi-point PID control.
Digital inputs/outputs and analog inputs/outputs Panasonic modules.
-EGTWC/PLC-SOF. PLC Control Software:
For this particular unit, always included with PLC supply.
Practices to be done with PLC-PI:
1.- Control of the particular unit process through the control interface box without the computer.
2.- Visualization of all the sensors values used in the particular unit process.
3.- Calibration of all sensors included in the particular unit process.
4.- Hand on of all the actuators involved in the particular unit process.
5.- Realization of different experiments, in automatic way, without having in front the particular unit. (These experiments can be decided previously).
6.- Simulation of outside actions, in the cases do not exist hardware elements. (Example: test of complementary tanks, complementary industrialenvironment to the process to be studied, etc).
7.- PLC hardware general use.
8.- PLC process application for the particular unit.
9.- PLC structure.
10.-PLC inputs and outputs configuration.
11.-PLC configuration possibilities.
12.-PLC program languages.
13.-PLC different programming standard languages (ladder diagram (LD), structured text (ST), instructions list (IL), sequential function chart (SFC), function block diagram (FBD)).
14.-New configuration and development of new process.
15.-Hand on an established process.
16.-To visualize and see the results and to make comparisons with the particular unit process.
17.-Possibility of creating new process in relation with the particular unit.
18.-PLC Programming Exercises.
19.-Own PLC applications in accordance with teacher and student requirements.
b) Technical and Vocational Education configuration
8 EGTWC/ICAI. Interactive Computer Aided Instruction Software System.
This complete software package consists of an Instructor Software (EDIBON Classroom Manager - ECM-SOF) totally integrated with the Student Software (EDIBON Student Labsoft - ESL-SOF). Both are interconnected so that the teacher knows at any moment what is the theoretical and practical knowledge of the students.
- ECM-SOF. EDIBON Classroom Manager (Instructor Software).
ECM-SOF is the application that allows the Instructor to register students, manage and assign tasks for workgroups, create own content to carry out Practical Exercises, choose one of the evaluation methods to check the Student knowledge and monitor the progression related to the planned tasks for individual students, workgroups, units, etc...so the teacher can know in real time the level of understanding of any student in the classroom.
• User Data Base Management.
• Administration and assignment of Workgroup, Task and Training sessions.
• Creation and Integration of Practical Exercises and Multimedia Resources.
• Custom Design of Evaluation Methods.
• Creation and assignment of Formulas & Equations.
• Equation System Solver Engine.
• Updatable Contents.
• Report generation, User Progression Monitoring and Statistics.
- ESL-SOF. EDIBON Student Labsoft (Student Software).
ESL-SOF is the application addressed to the Students that helps them to understand theoretical concepts by means of practical exercises and to prove their knowledge and progression by performing tests and calculations in addition to Multimedia Resources. Default planned tasks and an Open workgroup are provided by EDIBON to allow the students start working from the first session. Reports and statistics are available to know their progression at any time, as well as explanations for every exercise to reinforce the theoretically acquired technical knowledge.
• Student Log-In & Self-Registration.
• Existing Tasks checking & Monitoring.
• Default contents & scheduled tasks available to be used from the first session.
• Practical Exercises accomplishment by following the Manual provided by EDIBON.
• Evaluation Methods to prove your knowledge and progression.
• Test self-correction.
• Calculations computing and plotting.
• Equation System Solver Engine.
• User Monitoring Learning & Printable Reports.
• Multimedia-Supported auxiliary resources.
9 EGTWC/FSS. Faults Simulation System.
Faults Simulation System (FSS) is a Software package that simulates several faults in any EDIBON Computer Controlled Unit.
The "FAULTS" mode consists in causing several faults in the unit normal operation. The student must find them and solve them.
There are several kinds of faults that can be grouped in the following sections:
Faults affecting the sensors measurement:
- An incorrect calibration is applied to them.
Faults affecting the actuators:
- Actuators channels interchange at any time during the program execution.
- Response reduction of an actuator.
Faults in the controls execution:
- Inversion of the performance in ON/OFF controls.
- Reduction or increase of the calculated total response.
- The action of some controls is annulled.
- Several on/off faults can be included.
c) Multipost Expansions options
10 MINI ESN. EDIBON Mini Scada-Net System for being used with EDIBON Teaching Units.
MINI ESN. EDIBON Mini Scada-Net System allows up to 30 students to work with a Teaching Unit in any laboratory, simultaneously.
The MINI ESN system consists of the adaptation of any EDIBON Computer Controlled Unit with SCADA integrated in a local network.
This system allows to view/control the unit remotely, from any computer integrated in the local net (in the classroom), through the main computer connected to the unit.
- It allows up to 30 students to work simultaneously with the EDIBON Computer Controlled Unit with SCADA, connected in a local net.
- Open Control + Multicontrol + Real Time Control + Multi Student Post.
- Instructor controls and explains to all students at the same time.
- Any user/student can work doing "real time" control/multicontrol and visualisation.
- Instructor can see in the computer what any user/student is doing in the unit.
- Continuous communication between the instructor and all the users/students connected.
- It allows an easier and quicker understanding.
- This system allows you can save time and cost.
- Future expansions with more EDIBON Units.
The system basically will consist of:
This system is used with a Computer Controlled Unit.
- Instructor’s computer.
- Students’ computers.
- Local Network.
- Unit-Control Interface adaptation.
- Unit Software adaptation.
- MINI ESN Software to control the whole system.
- Cables and accessories required for a normal operation.