2 research outputs found
Wheelbed – a convertible wheelchair to bed / Muhammad Naquib Kamel Abdul Azem ...[et al.]
No full textFor most of the mobility disabled users, the wheelchair has been a boon right from its earlier development [1]. As time shifted, the wheelchair specifications have changed to identify the needs of various patient populations. The need for healthcare efficiency and an increasing emphasis on the interests of patients make it possible to ignore the needs of the caregiver for every patient. This is where the significance of wheelchair cum or known as convertible wheelchair into bed arises as this product is working in one-man operation and does not require any caretaker. The idea of wheelchair cum bed or we named as Wheelbed is a wheelchair that is operates on the principles of basic mechanical control and not using any electric power, however it is still easy to use and not complicated. Nowadays, this product is familiar in the marketplace, but most of them are an automatic wheelchair or using electric-powered wheelchair. Thus, the price would be more expensive and many of patients could not afford them. Therefore, a manual convertible wheelchair into bed could help every patient to afford this product. The reason why every patient should own wheelchair cum bed is because it could be a great help for them as it can enhance the quality of their life as this is a friendly assisting device for physically problem patients who are unable to lift and travel independently from their bed. Besides, this product may also be used not just by people with conventional mobility impairments, but also by people with cardiovascular and fatigue-based conditions [2]. Other than that, this product would also easier the caregiver or nurses. Due to the pain of extended sitting, caregivers will often need to transfer the patient back into bed and for that kind of workload, by lifting them in and out of bed, nurses are more likely to hurt themselves or their patients. This product lets the caregiver escape physical lifting conditions that place their back at risk of injuries and at the end of the workday allow the caregiver more energy
Optimized design and performance analysis of a high-pressure radial turbine for energy recovery applications
No full textSingle-cylinder direct-injection engines suffer significant exhaust energy losses; however, designing efficient radial turbines for such systems requires a physical characterization of pulsating flows and thermal stresses. This paper investigates the design and performance of a 500W high-pressure radial turbine for waste energy recovery for a single-cylinder engine. The main objective of this study is to optimize the turbine's dimensions and efficiency for capturing exhaust energy upstream of catalytic converters in internal combustion engines. Employing a two-stage computational approach, numerical modeling first established key geometric parameters, including a 19.3 mm inlet radius, 5.1 mm leading-edge length, 72° inlet angle, and 0.7 outlet radius ratio, followed by CFD simulations in ANSYS CFX using a 212,212-element single-passage mesh at 50,000, 70,000 rpm and 90,000 rpm, and 800 K inlet temperature. The optimized turbine demonstrated peak efficiency of 67% at a mass flow rate of 0.005 kg/s, revealing that systematic numerical optimization significantly enhances energy conversion efficiency. These results provide critical insights for developing compact, high-efficiency turbines for exhaust energy recovery systems, advancing waste heat utilization technology
