Baseline Evaluation of Potential to Use Solar Radiation in Air Conditioning Applications

AbstractThe study presents a global evaluation of the potential to use solar radiation in the air conditioning with application to an office building located in Cluj-Napoca, Romania. The study was realized for a one year period, based on multiannual average values for solar radiation and ambient temperature. It were compared the performances of two types of solar cooling systems, one based on absorption chiller and one of photovoltaic type. It is presented the methodology for calculation of the efficiency of the solar thermal field and of the equivalent photovoltaic field, placed on the terrace roof of the building, considered completely filled with evacuated tubes solar collectors tilted at 45° and facing south was taken into account or with photovoltaic field of collectors oriented in the same position. The solar collectors were arranged to completely avoid each other shading, for any solar altitude angles higher than 30°. The one year variation of several calculated parameters is presented together with the corresponding variation in the period of (10-20) June. The one year thermal solar cooling fraction was found to be of 24.5% and the one year photovoltaic cooling fraction was found to be of 36.6%

A Multi-Attribute Sales Comparison Method for Real Estate Valuation

The theory and practice of real-estate valuation has attracted immense interest over the past decades. This paper is concerned with the sales comparison approach. First, a brief survey of some procedures used worldwide, the sales comparison by adjustments, the hedonic regression and the hedonic price index method, is presented. To improve the versatility of property appraisals a new valuation method, as a combination of multi-objective optimization (MOO) and multi-criteria decision analysis (MCDA) is developed. A unique feature of this model is that it enables the appraiser to evaluate the characteristics of a property on those scales of measurement to which they belong de facto. To comply with this objective, distinct metric distance functions on each scale of measurement, including the two qualitative scales (nominal and ordinal), are employed. After that, the physical worth of a property is derived as a weighted sum of the composite scores. This can be measured on an interval scale. To predict the monetary worth of a property, a simple linear regression model is developed. The benefits of the use of this multi-attribute valuation method is also discussed. A comprehensive real-world study showing the application of the procedure is included

Blended Learning Concept and its Applications to Engineering Education

Abstract. The technical educational act means theory and practice, individual study, group-based projects or experimental work that involves equipment, simulation/emulation software packages and laboratory applications. In order to develop advanced e-learning tools and integrate them within online platforms for higher and postgraduate engineering education, new methodologies should be taken into consideration: project-and problem based learning, virtual laboratory (remote access to laboratory infrastructure and task evaluation) or remote assistance for diploma projects and mobility grants. This paper presents new blended learning concepts and approaches and the manner they can be adopted in engineering education, by using the symbiotic computing paradigms adapted to blended learning, especially blended learning gap and blended learning bridge

Blended Learning Concept and its Applications to Engineering Education

Abstract. The technical educational act means theory and practice, individual study, group-based projects or experimental work that involves equipment, simulation/emulation software packages and laboratory applications. In order to develop advanced e-learning tools and integrate them within online platforms for higher and postgraduate engineering education, new methodologies should be taken into consideration: project-and problem based learning, virtual laboratory (remote access to laboratory infrastructure and task evaluation) or remote assistance for diploma projects and mobility grants. This paper presents new blended learning concepts and approaches and the manner they can be adopted in engineering education, by using the symbiotic computing paradigms adapted to blended learning, especially blended learning gap and blended learning bridge

Potential of Indirect Evaporative Cooling to Reduce the Energy Consumption in Fresh Air Conditioning Applications

AbstractThe study presents a complex evaluation of the indirect evaporation cooling technology potential to reduce the energy consumption of the fresh air conditioning system, of an office building in the climatic conditions of Cluj-Napoca, Romania. The study was realized for the cooling season of one year based multiannual values of ambient temperature and relative humidity. It was considered two types of fresh air conditioning systems. The classic system was considered composed of a cooling battery powered by an electric chiller and the evaporative system was considered composed by a recuperative heat exchanger, indirect evaporative cooling equipment and the same classic cooling battery. It was found that the fresh air cooling period starts in May and ends in September. The performances of the two air conditioning technologies were compared and it was concluded that the evaporative system allowed the reduction of energy consumption for the fresh air cooling with almost 80%