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    Change in heating energy requirements for various interior space temperatures: A case study of Karabuk
    (2013) Erturk, M.; Alevay, Kocyigit, G.; Cay, Y.; Coskun, C.; Oktay, Z.
    In this study, the effect of indoor temperature for heating on reduction of heating load in Karabuk province was studied for various cases. The potential heating degree-hour values for Karabuk are utilized by using average outdoor temperature distribution of the city. Heating degree-hour values of Karabuk province were estimated according to eleven different indoor reference temperatures (18-28°C). The average outdoor temperature distributions of Karabuk are calculated by utilizing the set of the past 32 years obtained from Turkish State Meteorological Services. The results show that heating loads heating load can be decreased by 47.5% and 4.9% for 18 °C and 28 °C indoor design temperatures, respectively. It is considered that these new method is very useful tools for governments to identify the cities with significant potentials for the reduction of the heating loads. © Sila Science.
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    The impact of determination of optimum insulation thickness on energy saving for different climatic regions of Turkey
    (2011) Cay, Y.
    Most of the energy resources are used for heating purposes in Turkey. For this reason significant energy can be saved by insulation applications on buildings. However, if the thickness of the chosen insulation material is above optimum thickness, additional costs will incur. In this paper the optimum insulation thicknesses, energy saving and payback periods for four provinces chosen from different climatic regions of Turkey have been calculated. Optimization calculation was made according to lifecycle cost (LCC) analysis. As a result of the calculations made based on five different fuel types (coal, natural gas, fuel-oil, LPG and electricity) and four different insulation materials (rock wool, extruded polystyrene, expanded polystyrene, foamed polyurethane), it was seen that energy saving was 21% and 80.18% and payback period was between 1.247 and 4.6 years at the optimum insulation thicknesses of 0.02 m and 0.202 m. © Sila Science.
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    The impact of methanol fuelled spark ignition engines on engine performance and exhaust emissions
    (2011) Korkmaz, I.; Cay, Y.
    In this study, the performance and exhaust emission values of engine have been investigated according to the results obtained from the experimental study using gasoline and methanol fuels in spark ignition engines. In these experiments a regular automobile engine with 4 cylinders, 4 strokes and 1,3 liter volume was used. Without making any modifications on the engine, the engine performance has been determined for both fuels between the ranges of 1100-4000 rpm, 5-40 Nm torque values. In the experimental study, the rotation number, torque, strength, mean effective pressure, brake specific fuel consumption, fuel flow rate, exhaust temperature and exhaust emission values of the engine have been measured. According to the experiment results, if the engine works on gasoline, its minimum brake specific fuel consumption becomes 400 g/kWh, whereas if it works on methanol this value becomes 900 g/kW. The values of CO emission of the engine vary between 2 and 6% for gasoline, whereas the range for methanol is between 1 and 4%. Minimum HC emission values, on the other hand, have been observed as 330 ppm for gasoline and 250 ppm for methanol. © Sila Science.