R.E.M. (Rekayasa Energi Manufaktur) Jurnal

Using the MPX5500DP Sensor for Monitoring Microcontroller-Based HVAC Systems and IOT

2023-05-26T08:55:41+00:00

MPX5500DP is a sensor designed to measure how much air pressure is traveling in a channel or piping system. The MPX5500DP sensor has an analog output value that can be converted into a digital signal to display data on how much air pressure is being generated. By utilizing the MPX5500DP sensor the purpose of this study is to measure air pressure in HVAC systems with Micro SD data storage and IOT (Internet Of Things) based Web Browsers. The method used in implementing the MPX5500DP sensor is, selecting materials, making tools, installing sensors and testing. The test results obtained from Micro SD storage are the average air pressure value of 15.76 kPa. The IOT test produced an average air pressure of 15.67 kPa. At the time of testing, there were problems where data transmission was very slow so that for 30 minutes the test only received 14 air pressure data that were read on the Web Browser, namely ThingSpeak. However, the IOT test on an air pressure gauge using the MPX 5500DP sensor was successful. The success of the IOT system in monitoring HVAC air pressure can assist in monitoring the HVAC system in multi-storey buildings.

A Mapping Research on Cofiring from 1979 - 2022: Bibliometric Analysis

2023-05-26T08:57:26+00:00

This study aims to investigate cofiring-themed articles through Bibliometric analysis using Biblioshiny. The metadata comes from the Scopus database, obtained using the keyword "cofiring". Nine hundred twenty-nine documents were obtained over 44 years (1979 – 2022). The study results show that the USA and China are hosts for cofiring researchers. The most relevant author and affiliate is from China, namely Longtu Li from Tsinghua University. The USA is the largest reference country for cofiring research. Cofiring research trends are divided into two clusters: the energy and power generation research cluster and the chemistry and ceramic materials research cluster. In energy and power generation research, three research themes relevant to current and future conditions are related to coal, biomass, and emission. The results of this study provide a comprehensive picture to academics in the fields of energy, power generation, chemistry, and materials science.

Effect of Size of Polyester Matrix Coconut Coir Powder on Bending Test and Scanning Electron Microscopy (SEM) Test

2023-05-26T08:59:19+00:00

Coconut plants are plants that are often found in all corners of the archipelago, so that natural products in the form of coconut in Indonesia are very abundant. Coconut fiber waste has the potential to be used as a reinforcement for new materials in composites. Coconut coir contains fiber which is an alternative natural fiber material in the manufacture of composites. The purpose of this study was to determine the effect of coco coir powder size on mechanical properties (bending test and SEM test) with coco coir powder size of 20, 40, 60 mesh with a volume fraction of 30% and following the ASTM D 790-03 composite material standard. SEM testing was carried out to determine differences in the surface conditions of the specimen due to fracture and the manufacturing process using the hand lay up method, SEM photos were used to analyze the morphology of the coconut powder composite with a polyester matrix. The results of the ASTM D 790-03 bending test resulted in the average bending strength values, namely 86,81 MPa resin specimens, 49,06 MPa 20 mesh specimens, 48,42 Mpa 40 mesh specimens, 45,44 Mpa 60 mesh specimens. The results of the SEM photo show that the powder is not completely bonded, so there are still voids and cracks in the empty matrix area, this can be caused by air trapping in the composite during molding.