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Barcelona 7th – 9th July, 2014 Development and Implementation of Educational Portable Equipment for Artificial Cold Production Subjects Daniel Sánchez.

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Presentation on theme: "Barcelona 7th – 9th July, 2014 Development and Implementation of Educational Portable Equipment for Artificial Cold Production Subjects Daniel Sánchez."— Presentation transcript:

1 Barcelona 7th – 9th July, 2014 Development and Implementation of Educational Portable Equipment for Artificial Cold Production Subjects Daniel Sánchez García-Vacas Ramón Cabello López Enrique Torrella Alcaraz Jorge Patíño Pérez Rodrigo Llopis Doménech Carlos Sanz Kock David Conesa Sorolla Hugo Negre Gómez Carlos Rodríguez Rodrigo Josep San Mateo Sanahuja

2 INDEX Introduction 1 Experimental facility 2 Results 3

3 Introduction 1 Educational Context The European educational framework based on ECTS credits system pretends; A teaching process focused mainly on student learning. A quantification of student workload: class attendance, seminars, practice sessions… Development of students’ skills, abilities and competencies. How to achieve students’ skills and abilities?  using practice sessions, because… Students can be in touch with “intangible” concepts showed in class: radiation. Consolidating new theoretical concepts. Developing of new skills and abilities. Students change its theoretical mind into a practical one. Sometimes it introduces a completely “new World”.

4 Introduction 1 Thermal Machines and Engine Area Our particular case: Department of Mechanical Engineering and Construction. Jaume I University Mechanical degree, Master degree. Subjects related with heat transfer: Thermal Engineering. Design of heat exchangers. Thermoelectric Power Plants. Air Conditioning. Combustion Infrared Thermography Cogeneration. Refrigerating technology …. etc.

5 Introduction 1 Practice Sessions All subjects have several practice sessions given in the same laboratory. Some examples: Heat transfer through plane surfaces and extended surfacesEnergetic demand in buildings (LIDER) and radiation heat transferAir conditioning and CombustionCogenerationRefrigerating plants based on vapour compression technology

6 Introduction 1 Regarding to artificial cold production subjects: In some cases research plants or facilities are used to teach students. It has some advantages and disadvantages: Advantages -M-Main variables (temperature, pressure, mass flow…) are measured. -V-Very close (or similar) to the real one. -S-Since the refrigerating facility has been studied previously, is totally known. Disadvantages -H-High electrical energy consumption. -S-Secondary loops are necessary  heat transfer rejection and/or heating. -T-They are very expensive and heavy. -T-They can be modified continuously. -C-Can be difficult to understand for students. Practice Sessions

7 Introduction 1 Main Objectives OBJECTIVS: Development a portable and lightweight educational equipment based on vapour compression simple… in order to be used in theoretical classes and practice sessions. REQUIREMENTS: Inexpensive. Powered by 240 VAC and 50 Hz Portable and lightweight. Vapour compression cycle without internal heat exchanger (IHX). Easy to use. Transparent heat exchangers  condensation and evaporation processes must be visible. All the main variables (temperature, pressure…etc.) must be registered.

8 INDEX Introduction 1 Experimental facility 2 Results 3

9 Experimental facility 2 Structure Portable and lightweight The structure has been assembled with 25 x 25 x 1.5 mm square steel profile. Moreover, pine wood panels has been bolted to square steel profile to reduce weight. Dimensions Hight: 645 mm Wide: 670 mm Thin: 250 mm

10 Experimental facility 2 Refrigerating Diagram Vapour compression cycle: [1] Hermetic compressor [2] Oil separator [3] Transparent condensator [4] Sight glasses [5] Liquid receiver [6] Filter-drier [7] Micrometric valve [8] Transparent evaporator [9] Pressure transducers [10] High and low pressure gauge

11 Experimental facility 2 Main Components Transparent heat exchangers  glass and ground glass Maximum operating pressure 12 bar with Nitrogen Accordingly we choose a low pressure refrigerant  R600a (isobutene) Hermetic compressor form EMBRACO Model: EMT30CDP, with a cooling capacity of [130 ÷ 409 W] working at [-5 ÷ 15 ºC] (evaporating) [35 ÷ 65 ºC] (condensing).

12 Experimental facility 2 Two DC fans are installed in order to modify easily the condensing and evaporating temperature. Both have a voltage regulator to modify its flow. Main Components

13 Experimental facility 2 Data Acquisition System The DAQ system have to be inexpensive and flexible to be modified in the future. Accordingly we use the open hardware platform ARDUINO. Model MEGA 2560 with 54 digital i/o, 16 analog inputs, 256 kB internal memory and a clock speed of 16 MHz. Supply voltage of 7 – 12 VDC via USB or with a power supply, depends on the number of transducers.

14 Experimental facility 2 Transducers: Number Measured variableMeasured rangeSupply voltageAccuracyOutput signal 5 Temperature (ºC)-10 ÷ 85 ºC5 VDC± 0.5 ºCDigital 4 Temperature (ºC) Relative humidity (%) 0 ÷ 100 % -40 ÷ 125 ºC 5 VDC ± 2 % HR ± 0.2 ºC Digital 2 Pressure (bar) 0 – 8 bar 0 – 15 bar 24 VDC ± 0.25 % full of range Analogical (4 – 20 mA) 1 Electric Power (W)0 – 625 W24 VDC ± 0.5 % full of range Analogical (0 – 5 VDC) Temperature: 18DB20 Tª / HR: DTH22 Pressure: J&C p499 Data Acquisition System

15 Experimental facility 2 Two LCD have been used to show temperature, pressure, power consumption and temperature and relative humidity of air. The DAQ has two power supplies with 5 VDC, 24 VDC y 8 VDC to supply Arduino, transducers and evaporator and condesator fans. Data Acquisition System

16 Experimental facility 2 Assembly Costs The assembly costs included the price of all elements used. The total amount includes IVA and the corresponding discount (~40%). 4 sections have been defined:  Structure: €  Refrigerating cycle:291,38 €  DAQ + Transducers:287,06 €  Electrical installation:90,59 € Total: 699,61 € Total weight: 18,73 kg

17 INDEX Introduction 1 Experimental facility 2 Results 3

18 3 A compact and portable educational equipment based on vapour compression cycle, has been developed and implemented with a DAQ system. In order to show students all the equipment possibilities, an easy manual has been developed: Identification of main components. Representation of the cycle in the log P-h diagram. Representation of the air evolution in the psychometrical diagram. Calculation of the power exchanged by evaporator and condenser Calculation of the refrigeration facility COP. Calculation of the refrigerant mass flow rate. Study how affects variations of variables in the energetic behavior of the cycle. Since this project has been developed in the present academic year 2013/2014, the reactions of the students and teachers working with this unit have not been registered.

19 Thank you!! Development and Implementation of Educational Portable Equipment for Artificial Cold Production Subjects Barcelona 7th – 9th July, 2014 Questions? Please do not hesitate to contact me if you require further information:


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