Singgih Dwi Prasetyo

Bio: Singgih Dwi Prasetyo is an academic researcher from Sebelas Maret University. The author has contributed to research in topics: Photovoltaic system & Materials science. The author has an hindex of 3, co-authored 12 publications receiving 27 citations.

Rancang Bangun Alat Elliptical trainer Outdoor

Abstract: The placement of outdoor fitness equipment at tourist attractions is one of the attractions for tourists. Besides that, it can also be used as a means of health socialization for the community in public places. The elliptical trainer type air walker is a popular fitness tool because it is easy to use and has a small risk of injury. Elliptical trainer has a working principle like a walking person where movement is influenced by the force of the hand and leg movements. The design of an elliptical trainer fitness equipment that will be placed in a public place needs to be done to get a good level of security. This article discusses the design of an elliptical trainer device that is safe to place outdoors. The design process uses the Solidworks 2017a application. The elliptical trainer is divided into 4 parts, namely the main frame, drive shaft, hand handle, and leg handle. The manufacturing process is carried out based on Design Manufacture and Assembly and machinery to reduce the risk of manufacturing failure and make it easier to work on. The result of the elliptical trainer design has dimensions of 2,500 x 1,800 x 1,000 mm. The main frame has a safety factor of 3 with a displacement of 8,524e-7 mm.

Rancang Bangun Mesin Pencacah Limbah Kotoran Sapi

Abstract: Cattle farms produce waste which consisted of cow excrement in the form of solid, liquid, gas or cattle feed residual. Utilization of cow manure waste into organic compost requires proper processing technology which includes the technology of solid manure pulverizing and the technology of mixing raw materials. This research focuses on designing a cattle dung waste pulverizer. The methods used are numerical calculations, simulations using the Fusion 360 software, and fabrication based on Design for Manufacture and Assembly (DFMA). The main parts of the design include pulverizer, engine frame, cover (input and output hoppers), diesel motor, transmission belt and pulley. The safety factor obtained for the frame section was 4,645, for the cover section was 11.3, and for the counter section was 2,009 with assumptions of uniform load distribution of 20000 N. The power required for the design was 6.6 HP. The cattle dung waste pulverizer was built and tested using a diesel motor with a maximum power of 13 HP. The cattle dung waste pulverizer's capacity was 1500 kg/hour.

Energy consumption of spray dryer machine for producing red natural powder dye and its stability

Abstract: Natural dyes are very interesting to study lately, especially to produce them in powder form and see the stability of color and the energy needed. This study discusses the energy consumption of the spray dryer machine for producing natural coloring powders from Caesalpinia Sappan Linn wood. The parameters investigated were the flow rate of the liquid, the brix, the amount for powder produced, and the energy consumption required. The extraction was done at an immersion time for 2.5 hours and a temperature of 80°C. The results show that at the solution flow rate of 0.75 L/h, the amount of powder produced reached 2.5 g/h with the energy consumption varied between 4 to 14 kWh. The effect of brix on the production rate of powders followed the linear trend; y=2.314x – 2.0062. The stability of the red dyes is still low when applied the washing cycles 48 times. It is challenging to increase the stability and to reduce the energy consumption for real application.

Enhanced efficiency in hollow core electrospun nanofiber-based organic solar cells.

Abstract: Over the last decade, nanotechnology and nanomaterials have attracted enormous interest due to the rising number of their applications in solar cells. A fascinating strategy to increase the efficiency of organic solar cells is the use of tailor-designed buffer layers to improve the charge transport process. High-efficiency bulk heterojunction (BHJ) solar cells have been obtained by introducing hollow core polyaniline (PANI) nanofibers as a buffer layer. An improved power conversion efficiency in polymer solar cells (PSCs) was demonstrated through the incorporation of electrospun hollow core PANI nanofibers positioned between the active layer and the electrode. PANI hollow nanofibers improved buffer layer structural properties, enhanced optical absorption, and induced a more balanced charge transfer process. Solar cell photovoltaic parameters also showed higher open-circuit voltage (+ 40.3%) and higher power conversion efficiency (+ 48.5%) than conventional architecture BHJ solar cells. Furthermore, the photovoltaic cell developed achieved the highest reported efficiency value ever reached for an electrospun fiber-based solar cell (PCE = 6.85%). Our results indicated that PANI hollow core nanostructures may be considered an effective material for high-performance PSCs and potentially applicable to other fields, such as fuel cells and sensors.

Rancang Bangun Alat Elliptical trainer Outdoor

Abstract: The placement of outdoor fitness equipment at tourist attractions is one of the attractions for tourists. Besides that, it can also be used as a means of health socialization for the community in public places. The elliptical trainer type air walker is a popular fitness tool because it is easy to use and has a small risk of injury. Elliptical trainer has a working principle like a walking person where movement is influenced by the force of the hand and leg movements. The design of an elliptical trainer fitness equipment that will be placed in a public place needs to be done to get a good level of security. This article discusses the design of an elliptical trainer device that is safe to place outdoors. The design process uses the Solidworks 2017a application. The elliptical trainer is divided into 4 parts, namely the main frame, drive shaft, hand handle, and leg handle. The manufacturing process is carried out based on Design Manufacture and Assembly and machinery to reduce the risk of manufacturing failure and make it easier to work on. The result of the elliptical trainer design has dimensions of 2,500 x 1,800 x 1,000 mm. The main frame has a safety factor of 3 with a displacement of 8,524e-7 mm.

Rancang Bangun Mesin Pencacah Limbah Kotoran Sapi

Abstract: Cattle farms produce waste which consisted of cow excrement in the form of solid, liquid, gas or cattle feed residual. Utilization of cow manure waste into organic compost requires proper processing technology which includes the technology of solid manure pulverizing and the technology of mixing raw materials. This research focuses on designing a cattle dung waste pulverizer. The methods used are numerical calculations, simulations using the Fusion 360 software, and fabrication based on Design for Manufacture and Assembly (DFMA). The main parts of the design include pulverizer, engine frame, cover (input and output hoppers), diesel motor, transmission belt and pulley. The safety factor obtained for the frame section was 4,645, for the cover section was 11.3, and for the counter section was 2,009 with assumptions of uniform load distribution of 20000 N. The power required for the design was 6.6 HP. The cattle dung waste pulverizer was built and tested using a diesel motor with a maximum power of 13 HP. The cattle dung waste pulverizer's capacity was 1500 kg/hour.

An extensive review on the latest developments of using oscillating heat pipe on cooling of photovoltaic thermal system

Abstract: Photovoltaic-thermal (PV-T) panels are one of the major solar energy sources used to convert solar radiation into electrical power directly. This type of panel is considered a viable solution to guarantee energy security and reduce greenhouse gases. On the other hand, the efficiency of PV-T modules diminishes when the temperature of the nodule rises, leading to a degradation in the conversion efficiency along with the life span of a photovoltaic cell. Applying cooling techniques will lead to the decrease of the excess heat that is generated and will make the life span longer simultaneously. Higher efficiency can be achieved by incorporating oscillating heat pipe (OHP) into energy systems. PV-T module thermal and electrical efficiency can be improved by using an oscillating heat pipe. This review encourages the selection of an oscillating heat pipe and the heat transfer enhancement approach to increase energy conversion rate and the productivity corresponding to the PV-T system, as well as identifies the research gaps, future vision, and development that can be done. Firstly, the OHP-PV-T system and its performance in detail are illustrated. Then, the structure and working principles of the system are discussed, followed by a review of the work conducted in this case. The advantages of using an oscillating heat pipe as a solar panel cooling approach are then highlighted. Understanding the advanced cooling technologies mentioned above is vital for further modifications of current PV-T panels. Moreover, using nanofluid as coolant can make a significant contribution to enhancing the total system efficiency.