Parametric Optimisation of an ORC in a Wood Chipboard Production Facility to Recover Waste Heat Produced from the Drying and Steam Production Process

Abstract

The wastes in wood industries (waste chips) are commonly used as fuel for burners to produce steam and to use the remaining heat in the drying process. However, in spite of that, there is a considerable amount of heat evaluated from the burn of waste chips still released to the atmosphere without use. Therefore, in the present study, a cogeneration cycle design by used of ORC was designed and parametrically optimised for six organic working fluids (acetone, ethanol, R11, RE245fa2, R365mfc and R601a). During the ORC optimisation, the ORC turbine inlet temperature was changed from the saturated steam temperature of the fluid to the maximum temperature of the fluid. The ORC turbine inlet pressure was increased from 7.5 bar to the critical pressure of the fluid. As a result of the study, the maximum net power, net thermal efficiency and exergy efficiency of the ORC were found as 453.91 kW, 30.01% and 67.56% at 340 °C and 62.5 bar from the ORC with ethanol. This means that almost 30% of the waste heat could be recovered by use of the ORC with ethanol. By using the designed cogeneration system, it was calculated that the thermal efficiency of the system can be increased up to 74.01%.

The effect of the size and shape of wood particles on the tensile strength perpendicular to the plane of the particleboard: Experiments and modeling

“…6). Mechanical interaction of ellipsoids is provided by adhesive joints made in accordance with known technologies [1,3,11]. Analysis of the rupture surface of the samples after testing (Fig.…”

“…The strength of the PB at tension perpendicular to the plan depends on a number of factors, which include: size and shape of particles, particle size distribution, type of adhesive, material of particles, temperature and duration of pressing, degree of compaction [1,2,5]. In current work, we focus only on the influence of two factors, namely the size and shape of the particles.…”

“…The PBs production increases over time. New types of PB appear [1,2]. Contemporary PB technologies [3,4,5] allow the rational use of large volumes of low-quality wood (Fig.…”

“…Contemporary PB technologies [3,4,5] allow the rational use of large volumes of low-quality wood (Fig. 1), as well as waste from the processing of reed [6], bamboo [7] and other types of raw materials of plant origin [8], which contributes to the increase environmental safety and sustainability of socio-economic development [1,6]. The disadvantages of PBs include the potential for formaldehyde emission.…”

Integrated Vapor Compression Chiller with Bottoming Organic Rankine Cycle and Onsite Low-Grade Renewable Energy

“…The genetic algorithm has been used extensively in the past to find the global optimized values for the thermal systems, as can be found in refs. [58][59][60][61][62][63][64]. The parameters to perform the optimization were adopted from Imran et al [65] and are mentioned below in Table 8.…”