PROJECT-BASED LEARNING : APPLICATION TO A RESEARCH MASTER SUBJECT OF THERMAL ENGINEERING

The European Higher Educaton Area (EHEA) requires students to engage in more autonomous work. This autonomy is an outcome of the self-regulated learning process. Self-regulaton involves a self-management skill set that can cope with any adverse contngency and requires both knowledge of the available abilites and personal control to put these skills into acton. Learning the self-regulaton process is a critcal step in developing competences that enable the transformaton of mental apttudes into academic competences. However, it is necessary to modify the learning conditons to achieve self-regulaton in an adequate way. Thus, the academic authorites should empower skills that facilitate autonomous learning and contribute tools to student proactvity. In this regard, problem-based learning is an efectve method to facilitate the acquisiton of transversal competences. This didactc methodology may be performed in terms of the individual or teambased learning (TBL) that is necessarily linked to a teaching-learning open system. An adaptaton of Project – Based Learning (PBL) to the thermal engineering studies, i.e., the project-based learning model, was designed for the Research Master subject of ‘Building Energetc Efficiency’.


INTRODUCTION
Measuring students' work is a key metric in determining the design of academic planning.The amount of work that a student has to perform to meet the objectves of the academic planning is measured objectvely by the European Credit Transfer System (ECTS).The ECTS includes all of the theoretcal and practcal training that students should complete to achieve competency for their future professional status.Overall, three curricular models are distnguished: traditonal, problem-based and system-oriented (Hernández & Lacuesta, 2007;Heylings, 2002).
The concept of 'problem-based learning' (PBL) can be defned in a variety of ways.Richard Felder, Howard Barrows and Ronald Woods, who were involved in the early stages of PBL development at McMaster University (Canada), defned this concept in terms of an actve methodology that, along with knowledge attainment, facilitates the acquisiton of several transversal competences such as team work, search and selecton of informaton and synthesis and analysis abilites (Barrows, 1984;Felder, Woods, Stce & Rugarcia, 2000;Tseng, Chang, Lou & Chen, 2013).Learning is managed through the presentaton and problem-solving of a complex task, i.e., a project, that is related to a future professional actvity.It is not difficult to implement this methodology in engineering studies as a consequence of the methodology's applicability.Nevertheless, because students are not familiar with teaching-learning issues, it is necessary to establish clear steps to follow early in the project-based learning process.PBL is perhaps one of the most ambitous optons for promotng the development of competences in most tasks (Woods, 1996).Projects may be incorporated into a course in a variety of ways (Prince, 2004).Unlike other teaching-learning methods, the PBL methodology poses a problem (and/or project) before the students have acquired the knowledge needed to solve it (Dym, Agogino, Eris, Frey & Leifer, 2005).Once a project has been posed (or designed by students), diferent methodologies may be used to solve the problem: lecturing, instructor-facilitated discussion, guided decision making or cooperatve learning (Garcia-Robles, Diaz-del-Rio, Vicente-Diaz & Linares- Barranco, 2009;Hsieh & Knight, 2008;Jaeger, Mayrhofer, Kuhlang, Matyas & Sihn, 2013;Rodrigues, Kuri & Casale, 2012;Steinemann, 2003;Stoll, 1996;Yadav, Subedi, Lundeberg & Buntng, 2011).'Building Energetc Efficiency', a subject that belongs to the Thermal Engineering Research Master and consists of four ECTS credits, is taught in the second semester.This optatve subject has an average of ten students per session.For the next academic year (2013)(2014), a new project-based methodology plan will be established to ft this subject into the new demands of the EHEA.This methodology was implemented in other subjects in engineering studies (Villarroel & Herrera, 2004;Urraza & Ortega, 2009;Vasileva, Tchoumatchenko, Lakkala & Kosonen, 2011;Yasin, Mustapha & Zaharim, 2009;Zhou, Kolmos & Nielsen, 2012).The low number of students in this subject allows for an individual follow-up and the detecton of potental defcits of the methodology, which may be critcal for the contnuous improvement of the teaching-learning process.

DESIGN/METHODOLOGY/APPROACH 2.1 The development of a project-based learning methodology
The implementaton of a project-based learning methodology may cause difficultes for both students and teachers because of the change in roles compared with traditonal learning (Stewart, Mast, Gross, Pellegrino & Rodriguez, 2013).Thus, the student has to play a leading role while the teacher performs a directve and supervisory role in the learning process.Contrary to what is presumed, the new role portrayed by the teachers is more complex and requires greater skills than does the traditonal learning system (Hosseinzadeh & Hesamzadeh, 2012).Therefore, the teacher has to increase his knowledge of the subject to teach skills such as group dynamizaton and supervision, management of new technologies and leadership ability.
This learning strategy allows students to develop new skills to supplement their training and coaches them for their future professional performance.Figure 1 shows a scheme with the transversal and specifc competences of the subject teaching guide.According to the Tuning project, project-based learning also stmulates other skills such as team work, researching capability and self-regulaton (González, 2003).
The pedagogic aims of the project-based learning are as follows: • To promote a strong theoretcal basis of supervision and analysis for saving energy in buildings.
• To develop work schemes for an energy audit in buildings.
• To manage scientfc searching tools and meet the requirements of scientfc journals.
Considering the number of students enrolled in the master's program in previous years (an average of 10 students per year), three working groups are required.Each working party (3-4 students) should develop and report a unique and original project.The projects may be proposed by the students or selected from lists set out in a virtual platorm.In this study, the instructon method selected was cooperatve learning.The reason for selectng cooperatve learning methodology was to ensure that the students would acquire the competences contained in the syllabus (Figure 1).
At the beginning of the subject, the student receives informaton about the group's working techniques: confict resoluton and management, group goal setng and efectve communicaton.At the subsequent working session, the academic methodology is introduced to the students.A role-playing technique is used to recreate a professional context in the feld of energy efficiency consultng, in which the students serve as engineers and the teachers as customers.In additon, role-playing techniques are used to encourage student partcipaton.Subsequently, the tools to be used for the group's follow-up are detailed to the students as follows: • Project follow-up: weekly group meetngs, project progress, register of individual dedicaton tme, individual responsibility and task registraton.

Figure 1. Transversal and specific competences that will be developed following a project-based learning methodology
• Group norms: each group is encouraged to establish its specifc functoning rules, especially those for confict management and resoluton.
Each project is described by a fle summarizing the objectves, materials to use and the teacher's and students' weekly workload.Thus, the teacher, besides giving the material to the students, should spend tme giving detailed defnitons of unexplained issues during theoretcal classes.Keeping in mind the inital informaton of each project, the groups can freely choose from among these issues For example, a project could be as follows: Energy audit of a resort with the following objectves: • Optmizaton of the energetc consumptons and costs.
• Diversifcaton of the energy sources.
• Introducton of an energy management system under the UNE 216301 rule.
Moreover, each group should provide a paper review of the state-of-the-art in energy efficiency in buildings.This review will familiarize the students with database management and with locatng scientfc knowledge in journals.The maximum length and format of the project will be provided by the lecturer beforehand.The fnal report of the project, together with a daily record of the group's actvites (e-portolio), must be delivered to the teacher during the last week of the semester.The e-portolio will contain the documents used during project development.The documents will be classifed and archived at folders located in the virtual platorm, which will allow the teachers to analyze and evaluate the group actvites efectvely.Additonally, this report will be presented and defended by the group during class in front of the teacher and their colleagues.Afer the public expositon and defense are completed, the project will be assessed.For the evaluaton, the teacher will assess both group and individual performances.In complement, each student will provide a self-evaluaton and a co-evaluaton of their peers, i.e., an evaluaton of each member of the group.As a result of this partcipatve evaluaton, self-critcism and teamwork abilites will be empowered to the students (Rizo, 2004).
It should be noted that the project-based learning requires more resources than does the traditonal method.For example, physical space will be provided for the teacher assistant and group meetngs.

Figure 2. Proposed methodology scheme
The assessment of the subject is performed based on the syllabus for the subject (  1

. Evaluaton
To check the efectveness of these new tools, the academic results were analyzed (Table 2).As far as the academic results are concerned, no signifcant changes are expected.As observed in the table, in the 2012-2013 academic year, an increase of 15.06% in average score was achieved over the previous academic year.It is important to emphasize that in the 2012-2013 academic year, none of the students lef the course.

. Academic results
The academic results suggest that the use of PBL combined with other tools (e.g., e-portolio, rubric) may facilitate the teaching-learning process.Nevertheless, the small sample size means that these fndings must be treated as preliminary results.The standards used to assess each project were the same as in previous years, and it is therefore necessary to modify them to adapt to the PBL methodology.
To facilitate self-and peer-evaluaton, a rubric was designed (Table 3).The rubric allows students to evaluate the quality of the task in a transparent and objectve way (in this case, a project) because the rubric helps clarify the teacher's expectatons while reducing the assessment tme.The remaining percentage of the evaluaton (15%) will be assigned by the teacher.It will be necessary to reach a minimum of 10%.The competences evaluated will be written and oral communicaton skills, motvaton for quality, problem-solving ability, and other aspects to be determined by the academic tribunal.

Continuous evaluation by the report, exposition and defense of the project (Classmates' report
It should also be noted that teachers encountered difficultes when designing the project list because designing and applying the problem-based learning methodology requires more resources and better planning than do traditonal teaching-learning methods.

CONCLUSIONS
Per the EHEA, new didactc methodologies are required to cope with new demands for educaton.Therefore, project-based learning has become an ideal method to antcipate future professional practce for training engineers.Undoubtedly, the implementaton of this teaching-learning methodology into a subject requires a great investment of tme and efort and the subsequent actualizaton of the subject's program.Nevertheless, implementng the project-based learning guarantees the acquisiton of the competences recorded in the subject teaching guide.Moreover, the three-way evaluaton, in terms of self-, hetero-and co-evaluaton, provides added value to competence assessment.Hence, the student evaluaton will gain reliability.Finally, this procedure facilitates the learning of self-regulaton by the students and the analysis of the strengths and weaknesses of the training program.
One student left the course.Table2

Table 3 .
Assessment rubric of the project expositon and defense