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Featured researches published by Vedat Demir.


Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi | 2016

SÜT SOĞUTMA TANKININ BUHAR SIKIŞTIRMALI VE GÜNEŞ ENERJİLİ ABSORPSİYONLU (LiCl-H2O) SOĞUTMA SİSTEMLERİYLE SOĞUTMA PERFORMANSININ DENEYSEL İNCELENMESİ

Vedat Demir; Tuncay Günhan; Arzu Şencan Şahin; Orhan Ekren; Hamdi Bilgen; Aytunç Erek

Bu calismada ciftlik tipi bir sut sogutma tankinin, klasik buhar sikistirmali sogutma sistemiyle sogutulmasina alternatif olarak, gunes enerjili bir absorpsiyonlu sogutma sistemiyle sogutulmasi deneysel olarak incelenmistir. Calismada 1000 litre kapasiteli 2BII sinifi ciftlik tipi bir sut sogutma tanki kullanilmistir. Tank tabani klasik buhar sikistirmali sogutma yapabilecek ozellikte olup, tank cevresi ise absorpsiyonlu sogutma sistemine uygun ozel isi degistirici (rollbond) sistemiyle donatilmis olarak imal edilmistir. Deneysel calismalarda, klasik buhar sikistirmali sogutma sistemi ve hibrit yontem (icsel enerji depolamali LiCl-H 2 O ciftiyle calisan absorpsiyonlu sogutma ile ardindan klasik buhar sikistirmali sogutma sistemi) kullanilarak, sut sogutma tankinin ilk ve son sagim sogutma performanslari Uluslararasi ve Turk standartlarina gore ortaya konulmustur. Her iki sistemle yapilan sogutmada, ilk sagim sogutmasi sinir kabul edilen sure icinde tamamlanmistir. Son sagim sogutmasi ise, buhar sikistirmali sogutma sistemi ile zamaninda tamamlanirken, hibrit yontemle sinir kabul edilen sureden daha fazla zaman almistir. Genel olarak, ayni sogutma kapasitesi icin klasik buhar sikistirmali sogutma sisteminin ozgul enerji ihtiyaci 21,06 Wh/L olurken absorpsiyonlu sogutma sistemi ilaveli hibrit yontemin ozgul enerji ihtiyaci 18,01Wh/L olarak bulunmustur. Ulkemizin avantajli konumda oldugu gunes enerjisi, jeotermal enerji gibi yenilenebilir enerji kaynaklarinin kullanildigi absorpsiyonlu sogutma sistemlerinin farkli sogutma uygulamalarinda daha fazla yer almasiyla onemli duzeyde enerji tasarruflari saglamak mumkun olabilecektir.


Ege Üniversitesi Ziraat Fakültesi Dergisi | 2004

Seraya Giren Faydalı Işınım Enerjisini Hesaplamak İçin Bir Yöntem-II

Vedat Demir; Abdülkadir Yağcioğlu; Tuncay Günhan

The quantity of radiation in the greenhouses is the most important limiting factor for growing of plants. The quantity of this radiation mainly depends on the solar geometry and the structural components of the greenhouse. In this study, a model for estimating the transmitted direct and diffuse sun radiation inside a greenhouse which includes all factors mentioned above has been developed and also a computer code for simplifying the calculations has been written. This model has two modules. In first module, the quantity of transmitted radiation into the greenhouse has been calculated. In second module, the distribution of the transmitted radiation in the greenhouse has been analysed.


Energy Conversion and Management | 2005

Mathematical modelling of drying of bay leaves

Tuncay Günhan; Vedat Demir; Ebru Hancioglu; Arif Hepbasli


Biosystems Engineering | 2004

Mathematical modelling and the determination of some quality parameters of air-dried bay leaves

Vedat Demir; Tuncay Günhan; A.K. Yagcioglu; A. Degirmencioglu


Biosystems Engineering | 2007

Mathematical modelling of convection drying of green table olives

Vedat Demir; Tuncay Günhan; A.K. Yagcioglu


Biosystems Engineering | 2007

Evaluation of the Suitability of Some Local Materials as Cooling Pads

Tuncay Günhan; Vedat Demir; A.K. Yagcioglu


Biosystems Engineering | 2007

Development of Prediction Models for Friction Losses in Drip Irrigation Laterals equipped with Integrated In-line and On-line Emitters using Dimensional Analysis

Vedat Demir; Hüseyin Yürdem; Adnan Değirmencioğlu


Biosystems Engineering | 2010

Development of a mathematical model to predict clean water head losses in hydrocyclone filters in drip irrigation systems using dimensional analysis

Hüseyin Yürdem; Vedat Demir; Adnan Değirmencioğlu


Energy and Buildings | 2014

Experimental exergetic performance evaluation of a novel solar assisted LiCl–H2O absorption cooling system

Tuncay Günhan; Orhan Ekren; Vedat Demir; Arif Hepbasli; Aytunç Erek; Arzu Sencan Sahin


Biosystems Engineering | 2008

Development of a mathematical model to predict head losses from disc filters in drip irrigation systems using dimensional analysis

Hüseyin Yürdem; Vedat Demir; Adnan Değirmencioğlu

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Aytunç Erek

Dokuz Eylül University

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Arzu Sencan Sahin

Süleyman Demirel University

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