http://yetl.yabesh.ir/yetl1/handle/yetl/4303705 2026-04-25T04:10:04Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310678 Comparison of Pea Coal Combustion in a Novel Burner With Separated Primary and Secondary Air With Combustion in a Typical Retort Burner Wantuła, Michał; Pieter, Szymon; Kardaś, Dariusz Pea coal remains a significant fuel source for heating residential and public buildings, particularly in areas without access to centralized heating or gas networks. Recently, there has been growing interest in upgrading heating systems to modern automatic pea coal boilers. To address the need for more environmentally friendly solutions, efforts were directed toward designing pea coal burner that produces lower emissions of CO, NOX, and particulates compared to traditional retort burners. A new burner design using integrated in-burner secondary air (ISA) technology was developed. This innovative approach separates combustion air into primary and secondary streams. The air distribution is controlled by adjustable apertures operated via cables. Primary air is delivered to the base of the burner, directly to the fuel bed, facilitating coal pyrolysis and partial combustion. Secondary air is supplied to the top of the burner to burn off the gases generated during the process. Combustion tests were conducted with two types of pea coal using the ISA burner: uncertified (out-of-class) coal and certified pea coal. These tests were carried out at Klimosz, a company equipped with a specialized laboratory featuring a test stand with a boiler, measurement tools, and data recording equipment. Identical fuel and air settings were used for all tests. For comparison, a typical retort burner was also tested under the same conditions. Each test lasted several hours, during which key parameters were measured, including CO, NOX, O2, CO2, exhaust gas temperature, excess air coefficient, and particulate levels. Visual documentation of the combustion process was also collected. The results showed that the ISA burner outperformed the retort burner in terms of emissions. It emitted almost eight times less CO and reduced NOX emissions by over 25%. Particulate matter emissions from the ISA burner were comparable to those of the retort burner. However, when using uncertified coal, coking occurred, leading to sintering on the furnace surface and hindering combustion efficiency. 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310676 Analysis of Absorption-Compression Hybrid Refrigeration Systems for Using Low-Temperature Heat Sources Alklaibi, A. M.; Lior, Noam The main objective of this study is to explore and compare the energy and exergy performance of main configurations of nonhybrid (conventional), hybrid (with low- and high-pressure-side booster compressor), and absorption refrigeration systems using LiBr–H2O and H2O–NH3 working solutions, with focus on their ability to efficiently utilize low-temperature driving heat under hot climate conditions and to address their limitations. At a condensing temperature of 40 °C, the nonhybrid absorption systems can operate at generator temperatures as low as 81 °C and 102 °C for LiBr–H2O and H2O–NH3 systems, respectively, with a coefficient of performance (COP) of 0.67 and 0.30, respectively. Hybridization of the absorption refrigeration units permits the operation of the LiBr–H2O generator at as low as 70 °C, and of the H2O–NH3 generator at as low as 89 °C, with COP 38% higher than that of the nonhybrid system. The high-pressure-side hybridization reduces the COP, but the low-pressure-side hybridization has a COP comparable to that of the nonhybrid system operating at higher generator temperatures. Hybridization of the system on both sides complicates it and is thus justified when heat is available only at the lower generator temperature (70 °C). Hybridization when the generator temperature exceeds 85 °C for the LiBr–H2O system, and 120 °C for the H2O–NH3 system, has no operating advantage because the simpler nonhybrid system can operate with a higher COP (0.84 versus 0.8). 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310673 Study on Leak Detection of the Vehicle Fuel Evaporation System Based on the Positive Pressure Method Chen, Zihan; Zhang, Xin; Chen, Qiang; He, Ren 2025-01-01T00:00:00Z http://yetl.yabesh.ir/yetl1/handle/yetl/4310672 Optimized Multiclass Fault Detection in Solar Photovoltaic Modules Using TinySqueezeNet With Minimal Computational Overhead Bhetalam, Avinash; Naik, Kanasottu Anil 2025-01-01T00:00:00Z