Mechanical Engineering / Makina Mühendisliği
Permanent URI for this collectionhttps://hdl.handle.net/11147/4129
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Conference Object Citation - Scopus: 2Importance of Load Based Automatic Control in Geothermal Energy Systems(Elsevier, 2003) Şener, Adil Caner; Toksoy, Macit; Aksoy, NiyaziGeothermal energy production is not possible without use of electricity, since electricity is needed to pump geothermal fluid from underground to consumption point. The biggest portion of the operating cost in geothermal district heating systems comes from pumping energy consumption. In ibis study Balcova-Narhdere geothermal district heating system has been analysed and the optimum control strategies minimising the energy consumption in the system discussed. Then decisive factors in the efficient control and operation of geothermal healing systems have been studied. Finally fundamental automation requirements for efficient operation of geothermal district heating systems has been introduced. Copyright © 2003 IFAC.Article Citation - WoS: 66Citation - Scopus: 79Piping Network Design of Geothermal District Heating Systems: Case Study for a University Campus(Elsevier Ltd., 2010) Yıldırım, Nurdan; Toksoy, Macit; Gökçen, GüldenGeothermal district heating system design consists of two parts: heating system and piping network design. District heating system design and a case study for a university campus is given in Yildirim et al. [1] in detail. In this study, piping network design optimisation is evaluated based on heat centre location depending upon the cost and common design parameters of piping networks which are pipe materials, target pressure loss (TPL) per unit length of pipes and installation type. Then a case study for the same campus is presented. © 2010 Elsevier Ltd.Article Citation - WoS: 39Citation - Scopus: 41Economic Assessment of Geothermal District Heating Systems: a Case Study of Balçova-Narlıdere, Turkey(Elsevier Ltd., 2006) Erdoğmuş, Berkan; Toksoy, Macit; Özerdem, Barış; Aksoy, NiyaziGeothermal energy is an important renewable energy resource in Turkey. The aim of this research is to evaluate the Balcova-Narlidere geothermal district heating system from an economic perspective. The system is the largest one in Turkey in terms of heating capacity and located in Izmir. Although there are some assessments regarding energy and exergy analysis for the Balcova-Narlidere geothermal district heating system, an economic assessment was not performed, previously. The profitability of the investment is investigated by using internal rate of return method. Seven hundred and eighty different scenarios are developed in this assessment. In order to estimate the potential cash flows in the remaining project life, operating cost in 2002 is decreased and increased, alternatively, between 5% and 30% by 5% in each step, while monthly energy utilization price is changed between US$ 17 and 72 in those scenarios. The energy utilization prices are suggested according to zero IRR value for all scenarios due to the consideration of social and environmental concerns in this investment. It is found that, the proper monthly energy utilization price for a 100 m2 household would be US$ 55.5 when the operating cost and heating capacity in 2002 were remained constant.Article Citation - WoS: 25Citation - Scopus: 32District Heating System Design for a University Campus(Elsevier Ltd., 2006) Yıldırım, Nurdan; Toksoy, Macit; Gökçen Akkurt, Güldenİzmir Institute of Technology campus is in use since 2000 and still under development. At present, heating is provided by individual fuel boilers. On the other hand, the campus has a geothermal resource in its borders with a temperature of 33 °C. Because of this low geothermal fluid temperature; heat pump district heating system is considered for the campus. As an alternative, fuel boiler district heating system is studied. Each heating system is simulated using hourly outdoor temperature data. For the simulations, a control system with constant flow rate and variable return water temperature is used and the main control parameter is the indoor temperature. Various heating regime alternatives have been studied for heat pump district heating system for the various condenser outlet temperature and geothermal fluid flow rate, and two of these alternatives are given in this study. Furthermore, economic analysis has also been done for each heating system alternative based on investment and operational costs. Results indicate that heat pump district heating system has the highest investment but lowest operational cost. The alternatives are evaluated according to internal rate of return method, which shows the profit of the investment and resulted that, the heat pump district heating system has minimum 3.02% profit comparing with the fuel boiler district heating system at the end of the 20-year period.Article Testing Corrosion Rates on Steel Piping in Geothermal District Heating(National Association of Corrosion Engineers, 2008) İnce, Umut; Toksoy, Macit; Güden, MustafaThe corrosion behavior of St-37 pipeline carbon steel (CS) in a geothermal district heating system was tested at two different fluid velocities. An experimental set-up, directly connected the the end of the transmission line of a geothermal well, was used to assess the corrosion of St-37 steel tensile test coupons prepared in accordance with ASTM E8 in geothermal fluid. The geothermal fluid entered the set-up with a relatively low velocity, 0.02 m/s, and then injected into the well with a relatively high fluid velocity, 9.6 m/s. It was observed that while the uniform corrosion rates were relatively low, pitting corrosion rate, mainly driven by the sulfate-reducing bacteria (SRB) activity, was relatively high and more pronounced at low fluid velocities. St-37 steel material is prone to the pitting type corrosion, thus a biocide chemical addition and the fluid velocity of 2 to 3 m/s in transmission line were recommended to reduce SRB activity to reduce the pitting corrosion rate.Article Izmir-balçova Jeotermal Doğrudan Isıtma Sisteminde Kullanılan St-37 Karbon Çelik Malzemesinin Değişik Akışkan Hızlarındaki Korozyon Davranışı ve Mekanik Özelliklerindeki Değişimler(TMMOB Makina Mühendisleri Odası, 2004) İnce, Umut; Toksoy, Macit; Güden, Mustafaİzmir-Balçova ısıtma sisteminde kullanılan St-37 çelik malzemesinin düşük (0,002 m/s) ve yüksek (9,3 m/s) akışkan hızlarındaki korozyon davranışları ve korozyon sonucu oluşan mekanik özelliklerdeki değişimler araştırılmıştır. Deney sonuçları, düşük akışkan hızlarında homojen dağılmış korozyon hızının azaldığını ancak çukurcuk korozyon eğiliminin arttığını göstermiştir. Çalışılan her iki akışkan hızlarında malzeme yüzeyinde oluşan korozyon tabakalarının yapısı mikroskobik ve elemental analiz yöntemleri ile detaylı incelenmiştir. Korozyon deneyleri ve mekanik test sonuçları kullanılarak çalışılan akışkan hızlarında malzemenin ömürleri tahmin edilmiştir.Report İklimlendirme Sanayii İhratçılar Birliği Proje Raporu Proje 19: İklimlendirme Mühendisliğinde Uzman Mühendislik Uygulaması(İklimlendirme Sanayii İhratçılar Birliği, 2014) Toksoy, Macit; Aktürk, Cafer; Atmaca, İbrahim; Bulgun, Hakan; Dörtdemir, Ahmet Turhan; Erbay, Berrin; Gacaner, Güniz; Gerçek, Ersin; Kayacan, Akın; Küçüka, Serhan; Şahin, Numan; Taner, Kemal; Tanrıöver, Cevat; Tunç, Tufan; Uğural, Ufuk; Yalçın, MelihBu rapor, İklimlendirme Sanayii İhracatçılar Birliği (İSİB) tarafından düzenlenen 27 Kasım-2 Aralık 2012 tarihlerinde Antalya'da, 15-16 Nisan 2013 tarihlerinde İzmir'de (Çeşme) düzenlenen çalıştaylar sonucunda oluşan 19 Nolu "İklimlendirme mühendisliğinde uzman mühendislik uygulaması" konulu proje kapsamında, proje ekibi tarafından yapılan çalışmaları ve sonuçlarını içermektedir. Projenin amacı, "İklimlendirme sektörü alanları için uzmanlık eğitiminin ve uzmanlık şartlarının belirlenmesi, uzman mühendislik uygulamasının çağdaş uygulamalar (ABD; EU vs.) ışığında gözden geçirilmesi ve MMO için uygulamanın geliştirilmesine yönelik bir yol haritasının belirlenmesi"dir.