Comparison of Thermal Performance of Newly Produced Lightweight Wall and Roof Elements for Energy-efficient Buildings

In this study, both experimental and theoretical investigations are performed to obtain new concrete types with high thermal insulating characteristics for energy-efficient buildings. In this regard, 102 new concrete wall samples were produced using different aggregates at different volume fractions, and their thermophysical properties were tested according to EN and ASTM standards. The experimental research focused on developing new wall or roof types with higher thermal insulation properties in order to reduce the energy consumption of buildings due to heating or cooling. In order to specify the thermal performance of developed lightweight concretes, an analytical solution method is developed by the Complex Finite Fourier Transform CFFT method to estimate heat gain utilizing measured thermophysical properties data of those samples. The results indicated that the reduction in heat gain value was obtained as 83.21 % for the PC100 wall corresponding to conventional concrete. Consequently, the thermal insulation effect of those samples shows excellent potential for development

Production of diesel-like fuel from waste engine oil by pyrolitic distillation

The aim of this study is to obtain diesel-like fuel from waste lubrication engine oils by pyrolitic distillation method, which can be used in diesel engines. With this aim in mind, waste engine oil is collected in a tank, and it is purified from contaminants such as dust, heavy carbon soot, metal particles, gum-type materials and other impurities by filtering in the process prepared earlier. To investigate effects of additives known as sodium carbonate (NaCO3), zeolite and lime (CaO) on density, viscosity, flash point, sulfur content, heating value and distillation temperature, the purified oil samples are blended separately with additives having mass basis of 2%, 4%, 6%, 8% and 10%. The mixed samples are exposed to pyrolitic distillation process to produce fuels to be used in engines. Thermal and physical properties of the produced fuels such as density, flash point, viscosity, sulfur content, heating value and distillation temperatures are examined. From these results, the CaO with a ratio of 2% has the highest effect on decreasing of sulfur content of the waste engine oil and on acquiring the most suitable distillation temperatures close to values of a diesel fuel. Diesel-like fuel (DLF) is obtained as 60% of the waste lubrication engine oil.Waste oil Waste engine oil Pyrolitic distillation Diesel-like fuel

Theoretical and experimental investigation of total equivalent temperature difference (TETD) values for building walls and flat roofs in Turkey

The aim of this study is to find time lag (TL), decrement factor (DF) and total equivalent temperature difference (TETD) values for multilayer walls and flat roofs of buildings using experimental and theoretical methods, and to compare the experimental results with theoretical ones. The TETD is a method for calculating cooling load due to heat gain from the walls or flat roofs, and it can be obtained using values of inside and outside air temperatures, solar radiation, TL and DF. The TL and DF depend on the highest and the lowest temperatures at the inner and outer surfaces of the walls or flat roofs, and the time periods involved in reaching these temperatures. Hence, two testing rooms each consisting of four multilayered walls and a flat roof, air conditioner, measuring elements are built to measure all required temperatures. The required temperatures, which are hourly inside and outside air temperatures, and surface temperatures of each structure layer, are measured in every minute during testing periods of the 2007 summer season of Gaziantep, Turkey. Hourly solar radiation values on the walls are computed using hourly measured solar radiation on a horizontal surface. The TL, DF and TETD values of eight different walls and two different flat roofs commonly used in Turkey are computed utilizing the measured temperature and solar radiation values. The computed values for the TL, DF and TETD are compared with theoretical results obtained numerically using periodic solution of one dimensional transient heat transfer problem for the same structures.Total equivalent temperature difference Time lag Decrement factor Heat gain Cooling load

The role of hepcidin and its related genes (BMP6, GDF-15, and HJV) in rats exposed to ischemia and reperfusion

Conclusion: Hepcidin and BMP6, HJV, and GDF-15 should be taken into account when investigating the process of I/R

Evaluation of TRPM (transient receptor potential melastatin) genes expressions in myocardial ischemia and reperfusion

In the present study, the expression levels of TRPM1, TRPM2, TRPM3, TRPM4, TRPM5, TRPM6, TRPM7, and TRPM8 genes were evaluated in heart tissues after ischemia/reperfusion (IR). For this study, 30 albino male Wistar rats were equally divided into three groups as follows: Group 1: control group (n:10), Group II: ischemia group (ischemia for 60 min) (n:10) and Group III: IR (reperfusion 48 h after ischemia for 60 min and reperfusion for 48 h). The expression levels of the TRPM genes were analyzed by semi-quantitative reverse transcriptase-PCR. When compared to the ischemia control, the expression levels of TRPM2, TRPM4, and TRPM6 did not change, whereas that of TRPM7 increased. However, TRPM1, TRPM3, TRPM5, and TRPM8 were not expressed in heart tissue. Histopathological analysis of the myocardial tissues showed that the structures that were most damaged were those exposed to IR. The findings showed that there is a positive relationship between TRPM7 expression and myocardial IR injury