• Energy Research
• Restricted close
• Embargo close
• 12. Responsible consumption close
• 6. Clean water close
• 9. Industry and infrastructure close

The increase of distributed generation (DG) has brought about new challenges in electrical networks electricity markets and in DG units operation and management. Several approaches are being developed to manage the emerging potential of DG, such as Virtual Power Players (VPPs), which aggregate DG plants; and Smart Grids, an approach that views generation and associated loads as a subsystem. This paper presents a multi-level negotiation mechanism for Smart Grids optimal operation and negotiation in the electricity markets, considering the advantages of VPPs’ management. The proposed methodology is implemented and tested in MASCEM – a multiagent electricity market simulator, developed to allow deep studies of the interactions between the players that take part in the electricity market negotiations.

Engineered cementitious composites (ECCs) are special types of fibre-reinforced cementitious composites (FRCC) with higher strain capacity which can be achieved with low fibre volume as low as 2% and total elimination of coarse aggregates. Due to the outstanding performance of ECCs, they are suitable for various construction and repair applications. However, in order for ECCs to achieve their properties; a high amount of binder which is primarily composed of Portland cement (PC) is used alongside a special type of ultrafine silica sand (USS) which is different from the conventional natural fine aggregates. The production of PC is known to be detrimental to the environment due to its high carbon dioxide emissions coupled with the high consumption of natural resources. Thus, the high use of PC content in ECCs posed a sustainability threat. Similarly, the USS used in ECCs are not readily available everywhere and are expensive. The processing of the USS coupled with its transportation over long distances would also increase the cost and embodied carbon of ECCs. Hence, in order to promote more development and applications of ECCs for various applications; this dissertation aims to provide innovative ways to improve the sustainability of ECCs and their performances. This dissertation offers four solutions to improve the sustainability of ECCs which are (i) use of unconventional industrial by-products as partial replacement of PC (ii) total replacement of PC in ECCs with alternative sustainable binders (iii) replacement of USS in ECCs with recycled materials and (iv) the use of supplementary cementitious materials to replace a high volume of PC. The findings from this study revealed sustainable ECCs with acceptable mechanical and durability performance can be achieved with the use of alternative binders or replacement of the conventional USS used in ECC mixtures. The sustainability and cost assessment of the ECCs indicated that the incorporation of industrial by-products such as blast furnace slag (BFS) especially at higher content is beneficial to reducing the negative environmental impact and economic burden associated with ECCs compared to the conventional ECC. The sustainability index and cost index of the ECCs further showed that the use of BFS is more beneficial when the sustainability and cost of the ECCs are compared with the corresponding performance. Similarly, the use of recycled materials as an alternative to USS was found to result in a significant reduction in the embodied carbon and cost of ECCs. The use of recycled materials such as expanded glass (EG) as aggregates in ECCs was also found to improve the thermal insulation properties of ECCs making such ECC suitable for the production of building envelope elements.

An experiment in open-top chambers was carried out in summer 2008 in Curno (northern Italy) in order to study the effects of ozone and drought stress on net photosynthesis, growth and stable isotope partitioning on cuttings of an ozone-sensitive poplar clone (Oxford). The biomass (as dry weight) of stems, leaves and roots was assessed five times during the growing season on a set of plants intended for destructive measurements (set 1). Another set of plants (set 2) was used for repeated measurements (net photosynthesis) and then destroyed at the end of the experiment. The dry weight of the stems in set 1 plants was calculated using allometric relations. The results showed that drought stress had a strong effect on all the parameters assessed. Ozone did not have any effect on biomass allocation in woody stems and stable isotope composition but reduced root/shoot ratios and caused loss of leaves during the growing season. The loss of leaves in the lower part of the crown was partly recovered with the emission of new young leaves in the upper part, thus restoring the overall photosynthetic apparatus. We conclude that the metabolic costs suffered to repair damage and support growth, and the reduction in starch reserves in the roots can compromise growth and the capacity to cope with stress factors in subsequent years.

THERMODYNAMIC AND ECONOMIC ANALYSIS OF COMBINED HEAT AND POWER (COGENERATION) STEAM CYCLES SUMMARY Thermodynamic models for twoprocess heating, cogeneration steam cycles were developed in this study. These cycles are an extraction-condensing turbine cycle and a back pressure turbine cycle. Heat and electric outputs were calculated for inlet conditions ranging from 3 MPa, 250 C to 12 MPa, 535 C and process heat supply temperatures ranging from 80 C to 160 C. Furthermore, the performance of these cycles at 0 to 100 percent of their maximum heat outputs were examined. A simple method of economic analysis based on the annual costs was developed. This method can take part load into consideration. An extraction-condensing system and a back pressure system were compared by using this method. Process heating with cogeneration is a thermodinamically effective way of supplying heat and power to the industry. In a central plant, fuel can be burned more efficently, environmental controls can be applied more easily and economies of scale can be used to advantage. Furthermore, producing electricity as a byproduct in such plants is less expensive than producing electricity in power stations. In the extraction-condensing type, steam is expanded to condenser pressure and an extraction is made at the saturation pressure corresponding to the process heat supply temperature. In the back pressure type, steam is expanded only to the saturation pressure correspoding to the process heat supply temperature. The extraction-condensing turbines have the advantage that the electric output can be increased at partial heat loads. On the other hand, back- pressure turbines have a simpler mechanism of load control and lower initial costs. Detailed thermodynamic analysis of these systems appears to be lacking [14]-. For example, information on the variation of heat and electric outputs and thermal efficiencies of different configurations with changes in load and inlet steam conditions is essantial for the initial planning stage. viIn this study, computer modelling and simulation of two steam turbine based cogeneration cycles is made. Nu merical experiments were performed for various steam inlet conditions. Heat and electric outputs of cycles, heat input to the cycles and various parameters based on these thermodynamic quantities were calculated at full load and part load conditions. Partial loads ranging from 0 to 100 percent of full load were considered for the extraction-condensing cycle and partial loads of 37.5 to 100 percent were considered for the back pressure cycle. Thermodynamic Analysis The extraction-condensing turbine cycle consists of steam generator, turbine, condenser, heating condenser, feedwater heaters and pumps. The following assumptions are made regarding this cycle: The condenser is assumed to operate at 10 kPa. Extractions from the turbine to the feedwater heaters, heating condenser and the condenser is assumed to occur with a pressure loss equal to 5 persent of the exraction pressure. Pressure loss in the steam generator is assumed to be 25 percent of the turbine inlet pressure. Enthalpy rise of the feedwater is taken as 70 percent of the theoretically optimum value [13- This value is given by Ahopt = n/n+1 (hab - he) (1) where: n is the number of feedwater heaters, hs*> is the boiler drum satureted liquid enthalpy he is the enthalpy of satureted liquid leaving the condenser The loses in the expansion process through the turbine are accounted for by using an isentropic efficiency, r/, defined as : hi- ho r, = - t- r (2) h>- - hos where : hi is the enthalpy before expansion ho is the enthalpy after expansion hos is the enthalpy after an isentropic expansion This value is taken as 0.8 for the high pressure section of the turbine. The isentropic expansion efficiency for the flow between the heating condenser extraction and the turbine exhaust decreases linearly from 0.8 to 0.5 as the flow to the condenser decreases. Isentropic efficiency or compression in all of the pumps is asumed to be 0.7. viiThe calculations performed in the computer program are summarized in the block diagram of figure 1. Application of the first law of thermodynamics and the conservation of mass to each of the components of the cycle yield the exraction mass flows, work in the turbines and in the pumps, heat transfer in the boiler, heating condenser and in the condenser. Heat output is assumed to be primary output from the cycle. Electric output is considered to be a byproduct. Variation of the heat output is achieved by controlling the flow passing through the condenser. At 100 percent heat output, only the cooling steam flows to the condenser. At no heat output, there is no flow through the heating condenser. Cycle calculations have been performed for 100, 75, 50, 25, and 0 percent of the maximum heat output. Assumptions calculation procedures outlined above for the extraction-condensing cycle also apply for back- pressure cycle. The control of heat output, however, is different. The heat output of the back pressure cycle is varied by changing the mass flow rate through the turbine. Calculations have been performed for 100 to 37.5 percent of the maximum heat output. Properties of water required in the computer programs were computed using the equation and procedures given in [3]- Economic Analysis It is the economic consideration which will determine whether or not a cogeneration plant should be built. A simple method is presented here for determining the economic feasibility of a cogeneration plant. In this method all costs and revenues are expressed on an annual basis for comparison. Two assumption are made. First the heat demand is assumed to be supplied by other means if a cogeneration plant is not built. Therefore only the additional or incremental cost is considered. This includes the turbo generator set, condensers, feedwater heaters, steam generators, additional piping, fuel handling, exhaust cleaning measures, building and consruction costs as well as engineering cost. The second assumption is that all of the byproduct electricity produced can be utilised. A numerical example using this method shows that an extinction condensing cycle should bepreferred if the system is to operate at partial heat loads for long periods of time. Back-pressure cycle will be economically feasible only if the system operates at full load more than 90 percent of the time. However the most economic operation for the extraction-condensing cycle is also realized at full load. vmResults Results of the computer simulation of the two cycles discussed above. The key parameters on which the results are based, are explained below. Heat output per unit mass of steam entering the turbine has a maximum value for a given throttle condition and process heat supply temperature. Heat output from the cycle for a given set of turbine inlet conditions was varied as explained in the thermodinamic a na lysis. It was also found that the thermal efficiency of these cycles, defined as net work output over the heat input. Increasing the process heat supply temperature decreases the electric to heat ratio and the electric out put, increases the heat output. IXEnter the type of the system Turbine inlet pressure and temperature Process heat supply temperature Deter mine feedwater enthalpy rise and Turbine exraetion pressure Determine for the case of no heat output mass flow to the feed water heaters and the condenser r* Select a heat load as a percent of full load L-. Determine mass flows to the feedwater heaters, process heating condenser, condenser, net work, electric output heat output, heat input Figure 1. Block diagram of calculation procedure xi ÖZET Birleşik ısı ve güç çevrimlerinin endüstride kullanımının yaygınlaşması bu konudaki araştırmalara yeni boyutlar kazandırmaktadır. Bu durum göz ününe alınarak endüstride kullanılan buharlı birleşik ısı -güç çevrimleri ne ait termodinamik ve ekonomik çözümlemelerin yapıldığı bu çalışmada beş bölüm bulunmaktadır. Birinci bölümde, yapılan çalışmanın amacı açıklanmış, literatürdeki yerine ve önemine değinilmiştir. Konu ile ilgili kabullerden bahsedilmiştir. ikinci bölümde, buharlı güç çevrimleri hakkında genel bilgi verilmiştir. Çevrimlere ait T-s ve akis diyagramlarının yer aldığı bu bölümde çalışmada dikkate alınan değişkenlerin değişim aralığından bahsedilmiştir. Uçüncü bölümde, termodinamik çözümleme yapılarak, kısmi ve tam yükte ısı ve elektirik enerjisinin değişimi ile proses için gereken ısı enerjisi değeri hesaplanmıştır Dördüncü bölümde yakıt fi ati arı ve yakıt türleri yanısıra isletmelerin ihtiyaç duyduğu güç değerleri ve çalışma süreleri esas alınarak bu çevrimlerin ekonomik analizi yapılmıştır. Son bölümde sonuçların grafiklerle kıyaslama ve tartışması yapılarak her iki çevrime ait değişik değerlerin irdelemesi yapılmıştır. 69

It is widely known that fossil fuels are limited; consequently, the generation of new sources of energy in a clean and environmentally friendly manner is a research priority. Bioethanol appears to be one potential solution, especially second-generation production from renewable biomass.In order to use lignocellulosic feedstock to produce bioethanol, its polysaccharide components, cellulose and hemicellulose, must be hydrolysed into soluble sugars, which can then be converted into ethanol by fermentative microorganisms such as Geobacillus thermoglucosidasius TM242 used by the company ReBio Technologies Ltd.To date, the cost of commercial enzymes used during the hydrolysis process remains a major economic consideration in the production of second-generation bioethanol as an alternative fuel. The research project presented in this thesis aims to improve this rate-limiting step of microbial bioethanol production through an investigation of the different enzymes associated with hemicellulose hydrolysis. Firstly, the TM242 genome sequence revealed a number of genes encoding glycoside-hydrolases. Six of these genes were cloned and expressed in E. coli and the recombinant enzymes characterised; three of them, two β-xylosidases and an α arabinofuranosidase, are relevant to xylan hydrolysis, and were found to be highly active and thermostable. Crystallisation of one of the β-xylosidases permitted the determination of a high-resolution (1.7 Å) structure of the apo-enzyme along with a lower resolution (2.6 Å) structure of the enzyme-substrate complex, resulting in the first reported structure of a GH52 family member (Espina et al., 2014).Secondly, as the TM242 microorganism lacks xylanase enzymes, four genes encoding xylanases from closely-related Geobacillus strains were cloned and expressed in E. coli, with one of them being also successfully cloned and expressed in G. thermoglucosidasius TM242. This heterologous xylanase was secreted in active form representing an enhanced biomass utilisation by TM242.In conclusion, it is felt that the findings presented here have the potential to make a valuable contribution towards second-generation bioethanol production.

The reduction of the dioxin levels in the exhausts of today waste-to-energy plants relies on the control of the thermo-fluid-dynamic processes occurring within the combustion chamber, rather than on policies aimed at restricting the amount of chlorine in the waste material to be treated. This is a consequence of the fact that waste-to-energy plants currently receive the bulk of discarded PVC and other chlorine sources that are deliberately burned in order to increase the waste heating value. Indeed, severe law regulations are into force in many industrialised countries, posing constraints on the value of some relevant in-chamber thermo-fluid-dynamic variables, such as temperature and residence time of the gases resulting from the combustion process, whose accurate experimental monitoring is extremely expensive and difficult to achieve. The present work analyses the shortcomings of the methods generally employed in full scale plants for the verification of the temperature and residence time of gases produced during the combustion process, and presents the advantages of using a new procedure developed by authors, based on the numerical simulation of the waste combustion process to optimise monitoring of the quantities of interest. The verification of the developed model, which accounts for both the solid and the gaseous phases, and for the various modes of heat and mass transfer between these phases, is obtained through a comparison with the results of an experimental campaign carried out on a full scale plant in Italy. The temperature distribution in the combustion chamber is calculated considering various waste compositions, and both forced and mixed convection. In fact, it is also shown that neglecting buoyancy effects may lead to appreciable errors.

SUMMARY A NEW METHOD FOR THE ORIENTATION AND DESIGN OF A BUILDING OF MINIMAL ENERGY CONSUMPTION Substitution of passive solar systems for the `dirty` combustion of fossil fuels for energy use in buildings to keep the environment biologically clean, can make important contributions to the health, both of individuals and of the global ecosystem, as well as contributing to the energy economy. Local outdoor chemical pollution, with all the damage it causes, can also be reduced with energy-cone ious design. A new method for design and orientation of an energy conservative building is presented for the use of architectural, urban planning, and energy engineering purposes. The precedure of the thesis is explained in five chapters. The concept of the energy conservative building is given in passive systems' methodology in Chapter 1. Also in the same chapter, the climatological effects on the building envelope and a review of current calculation procedures and computer programs with solar heating and cooling system capabilities are included. Successful passive solar architecture integrates energy conservation with passive solar heating, natural cooling and day lighting. The result can be a comfortable and economic building that uses 50%-90% less operating energy than most contemporary buildings. A world wide interest in passive solar architecture has developed since last five years because it provides an alternative to the trend toward an overdependence on lighting, heating, ventilating, and air conditioning equipment to maintain a livable and productive indoor environment in modern building. Building practitioners in many devoloping countries are interested in passive solar methods which may be integrated into the building design using familiar and readily available materials. Passive solar architecture has emphasized heating of residences in temperate climates; however, passive strategies have now spread to nearly all building types and most climates. The process is more complex for institutional and commercial buildings than for residential, but the same concepts always apply. viiiHour-by-hour simulation provides the backbone for design analysis. For smaller or simpler buildings simplified methods are usually based on monthly analysis. For larger or more complex buildings, the trend is to take full advantage of the inceased computing power of the current generation of powerful microcomputers in order to use simulation directly for design. Convenient design tools based on simulation are becoming available. The entire area of design tools appropriate to passive solar architecture needs much additional effort. Rasearch in the software design area, with powerful microcomputers, expert systems, and computer aided design techniques, promises to aid greatly in the spread of passive solar strategies. The second chapter is a review of the methods of estimation of hourly beam, diffuse and reflected solar radiation data for vertical and horizontal surfaces; whereas in this chapter Liu-Jordan's equations have a significant emphasis and are explained in full detail. There is evidence with the increasing emphasis on the use of solar energy in buildings, that much of the past solar radiation data will be rehabiliated and additional data will be collected in the future; however, it is unlikely that the hourly data to be taken will be extended to cover surfaces other than the horizontal for the majority of the stations. Liu and Jordan conducted extensive analyses during the early I960' s on the available solar radiation data and developed several emperical correlations that can be used to estimate the available solar radiation on `average` days for each month of the year and for a larger number of locations in the United States and Canada. Using the correlations, it is possible to take the monthly average daily total radiation on a horizontal surface, divide the daily total into direct and diffuse components, convert each component into hourly values, and then compute the hourly value of either component on a surface of any orientation desired. In the third chapter shadow analysis techniques for window and building energy studies are examined in detail. These techniques are examined under two parallel groups of classification. In the first group, roughly, the methods deal either with the building as a whole or only with the windows. In the second group, however, the methods are classified according to the first or second position of the observer. ixShading and solar influences on a building can be understood from two different observer positions. At the first position the observer stands at the ground or the building element and looks toward the Sun. The entire yearly movements of the Sun and relationship to the modifying intermediate conditions are seen at one time j thus, from the single station point, the observer has a yearly picture of solar movement. The disadavantage of this technique is that every position of the subject surface must be seperately analysed with a a new drawing and accompanying calculations. For a total analysis, a continious three-dimentional site volume must necessarily be broken into discrete representative points each of which is seperately analysed. Without intermediate obstructions any point on a site is equivalent in a solar analysis, since solar rays are parellel. However when the obstruction is large or close, its influence on different station points may be quite varied, such as on an urban. Since the proximity of the obstruction determines the the degree of variation in complex situations, differences may be considerable. Therefore, the movement or location of shadows is impossible to analyze, for only by accident can one determine whether the discrete object point is at a shadow edge. The crucial issue of total overshadowing effects and shadow patterns cannot be seen, nor can the entire building be examined at one time. In the second position, as used in the new method, the observer is located at a spot between the Sun and the building. By considering both the Sun and the entire building at once, all surfaces in any orientation can be observed under solar illumination. In this position, the relationship of of one portion of the site can be understood acting on another portion of the site. It is clearly seen from the examples that in the methods dealing only with the windows, the observer is, generally, in the first position, whereas in the methods which consider the building as a whole, the observer is in the latter position. The method is explained in details and step by step with a set of examples in Chapter 4. The method is an optimisation of the total percent of the sunlit area and the thermal effect due to the beam component of total solar energy on the vertical exterior surfaces of a building of minimal energy consumption, in Olgyay's bioclimatic chart which considers temperature, solar energy, wind, precipitation, relative humidity and vapor pressure. In other words, the method is a new and comprehensive interpretation of Olgyay's well known Overheated period charts. By replacing the secondposition of the observer in hourly simulation by the original gnomonic diagrams based on the first position of the observer, the metod gets closer to the aims of Olgyays' in the interpretation of architectural principles, site selection, sol-air orientation, solar control, environment and building forms, wind effects and air-flow patterns, and finally the thermal effects of materials. The method assumes that solar radiation does not penetrate the building; therefore it deals neither with the heat transfer problems nor the thermal storage capacity of the building, for the time being. The method does, however, generate relaible kernel data base for future research work on building heat transfer problems. The method is composed of two parts, the second being based on the first. The first part of the method deals with the changes in the sums of the total annual percents of sunlit areas (sunny portion of total exterior walls/total area of exterior walls) of a building at any location, relative to the changes in the orientation. In the second part, the thermal energy of the direct component is added to the variables mentioned above; e.i., location, geometrical design and orientation of the building. Thus, each wall is taken into consideration seperately, with the changes of intensity of solar energy and the percentages of sunlit area on it, due to the changes of the orientation of the building. The method is compiled in ten steps, of which the first five build the primary part, and the last five the secondary. The steps are as follows: 1. Olgyays' bioclimatic chart is adapted to the geographical place. The Overheated and the Underheated periods for selected hours of daytime are marked for selected days. For the selected hours of the selected days 2. percentages of sunlight on the walls of the building of a given orientation are computed, with any shading algorithm of parallel projection. 3. areas of sunlight (mE) on the walls of the building of a given orientation are computed, 4. total percentage of sunlight on the building is computed and grouped under two intensities, e.i. the Overheated and the Underheated. xi5. The annual sums of the total percentages of sunlight for the Overheated and Underheated periods are devided by the number of the Overheated and Underheated daytime hours respectively. 6. Solar thermal energy due to the beam component of hourly radiation is computed for each orientation (KJ/mz.h). 7. Solar thermal energy due to the beam component of hourly radiation is computed for each wall (KJ/h). 8. Total solar thermal energy gain of the building due to the beam component of hourly radiation is computed (KJ/h). 9. Hourly total solar thermal energy gains of the building are grouped under two intensities, the Overheated and the Underheated. 10. The annual sums of total solar thermal energy gains of the building for the Overheated and Underheated groups are devided by the number of Overheated and Underheated daytime hours respectively. application of the first part of the method is done by three blocks of passive apartment houses of the same area and hight, but of different design, for istanbul and Antalya, and for 1., 11., and 21. days of the months. For the second part, however, only the second block is examined for istanbul, and only for 21. days of the months. Hence comparisons of two sets of meteorological data and all the parameters mentioned above may be seen clearly from the graphics relative to the changes in eight orientations, e.i., North, North-East, East, South- East, South, South-West, West, and North-West. A minor modification was made in Olgyay's Overheated period charts in order to eliminate what was believed to be erroneous results by the use of Liu-Jordan equations near the sunrise and sunset hours for the application of the second part of the method. Although percentages of sunlight on the vertical exterior walls are computed with a shading technique based on Conlon's JPCSHAD parallel projection algorithm and the inclusion of the thermal effect mentioned above is done by Liu-Jordan's well known equations, the method is still applicable to other scientists' formulae and shadow analysis models as well. At the last chapter, the method is evaluated and further possible reseach work are pointed out. xiiThe method may be used to generate a wide variety of building blocks. The irradiance load on external surfaces of building blocks of any rectangular design may be evaluated for any orientation, time of day and for different localities. This evidently provides the designer with useful information, guide lines and design aids expanding his ability to manipulate the parameters of form for the control of solar environment and to develop practical indicators and building regulations for planning control. The method may furter be used in a generative process to define alternative proportion of block's sides, configuration of surroundings, street widths, physical characteristics of building surfaces for appropriate solar load criteria. Thus the method may be employed directly in conjunction with other performance criteria for a sythesis of an integrated architectural solution. xiii ÖZET Yapıların, enerji korunumu için yönlendirilmesi ve biçimlendirilmesinde, dış kabuk düşey yüzlerindeki doğrudan güneş ışınımına bağlı, güneşlenme yüzdeleri ve ısıl etkilerin Olgyay konfor bölgelerinde gözlemcinin 2. durumuna göre optimizasyonunun yapıldığı bu metod, iki kademeden meydana gelmektedir: Birinci kademede herhangi bir enlem, boylam ve biçimdeki yapının, düşey dış kabuk elemanları üzerindeki yıllık ortalama toplam güneşlenme yüzdeleri (güneşli alan/toplam alan), güneş ışınımı, bağıl nem, sıcaklık ve hava hareketlerine bağlı Olgyay konfor bölgelerindeki iki şiddet grubu, En Az Sıcak Dönem (EASD) ve En Sıcak Dönem (ESD) altında toplanmakta ve bu değerlerin yönlendirilişe göre değişimi incelenmektedir. Başka bir deyişle, yer, biçim ve yön değişkenlerinin birbirleri üzerindeki etkileri güneşlenme yüzdelerindeki farklılıklar ile belirlenmektedir. ikinci kademede yukarıdaki değişkenlere doğrudan güneş ışınımının düşey yüzeylerdeki ısıl etkileri de eklenmekte ve yapının bütünü ile ilgili, yer, biçim ve yön değişkenlerinin etkileşimine, beher duvarın konumuna ve üzerindeki saatlik güneşlenme yüzdelerine bağlı enerji kazançlarındaki farklılıkların ortalamaları da katılmaktadır. ikinci kademenin uygulamasında Liu- Jordan denklemleri, dünya sathında denenmiş ve kusurları ortaya çıkmış olduğu için, tercih edilmiş; ancak metod diğer araştırıcıların bağıntılarına da açık bırakılmıştır. Yeni metodun gelişimini hazırlayan konular başlıca üç bölüm içinde incelenmiştir. Birinci bölümde enerji korunumlu yapının tanımı pasif sistem metodolojisi içinde verilmekte; aynı bölümde, yapının dış kabuğunu etkileyen iklim elemanları kısaca ve bilgisayarlı ısıl enerji analiz metodları tarihsel gelişim içinde, ikinci bölümde metodun 2. kademesi için önem taşıyan güneş enerjisi verilerinin elde ediliş yolları incelikleri ile açıklanmaktadır, üçüncü bölümde ise yapılarda uygulanan gölge analizi metodları gözlemcinin durumuna göre tanıtılmaktadır. Dördüncü bölümde metod ve inceliklerinin anlaşılabilmesi için bir dizi uygulama sunulmakta, ayrıca birinci kademenin uygulanmasında yararlanılan JPCSHAD gölge algoritması tanıtılmakta ; sonuç bölümünde ise metod değerlendirilmekte ve ileriye dönük araştırmalar için önerilerde bulunulmaktadır. vii 145

In this paper, the implementation of a simulation model for studying the effect of cross-bonding of metallic sheaths and/or non-magnetic armor of single-core medium voltage cables in the same circuit is discussed. With the use of single-core cables, the resistive losses due to the induced circulating currents in cable sheaths or armors causes an increase of cable temperature that reduces its ampacity. In addition, the risk of electric shock due to induced voltages may be present if a person is exposed to the armor/sheath at the unbounded end. For this reason, special bonding techniques are used to significantly reduce these currents. The authors have implemented a model that could be used to help optimize the cross-bonding configuration for single-core cables employed in high-current industrial applications. The model has been experimentally validated thanks to actual data from a medium-voltage underground line.