Sick building syndrome (SBS) is a collection of symptoms experienced by buildings occupants such as headaches, mucous, membrane irritation, respiratory problems and fatigue. A building is claimed to have SBS if more than 20% of building occupants experience symptoms. Poor indoor air quality contributes to SBS in the building. This study aims to investigate the correlation between indoor air quality and SBS symptoms in 1st and 2nd floors of the Post office building in Bandung. The study used quantitative methods with a cross sectional study design. Data collection was carried out using particle counter, thermometer, lux meter and anemometer to measure the indoor air quality, while the questionnaire utilized random sampling technique with 119 respondents. The results of the primary data were compared with the air quality standard from Minister of Health No. 1077, 2021. The results of the Statically Compare Means and Independent T-test showed that the p-values of the temperature on the 1st floor and 2nd floors were 0.437 and 0.000, respectively. Meanwhile the p-values of PM10 and PM2.5 on the 1st and 2nd floors were 0.005 and 0.290 and 0.004 and 0.364, respectively, and the p-values of the lighting on the 1st and 2nd floors were 0.002 and 0.015. It indicates that there is a significant relationship between concentrations of PM10 and PM2.5 on the 1st floor with SBS symptoms and the temperature and humidity on the 2nd with SBS symptoms. Since 29 peoples (24% of the building’s occupants) experienced SBS, the building was considered to have a significant potential to cause SBS to its occupant.
The present study investigate the feasibility of absorption chiller utilization as part of trigeneration system that possibly applied in sub-tropical country building. Trigeneration is refer to the heat utilisation from electric generator (combined heat and power, CHP) to generate absorption chiller in order to produce chilled water for air conditioning system (combined cooling, heat and power, CCHP). Compare to the vapour compression system, absorption chiller that is mainly generated by heat waste, promised benefit economically and environmentally. Overall efficiency of CCHP can reach 71 % and possibly reducing emission until 146709.07 kg CO2. Economic analysis using the Payback period methodology has shown that the CCHP would produce a return on investment of 2.6 years. Improvements absorption chiller and support from government are expected to lead to increased return on investment and improved viability of the system.
<p><em>Mini freezer</em> yang terdapat di pasaran umumnya memiliki temperatur kabin hanya sampai -20<sup>o</sup>C. Penelitian ini bertujuan menampilkan metode perhitungan panjang pipa evaporator sehingga dapat mencapai temperatur kabin hingga -40<sup>o</sup>C dengan menggunakan refrigeran R404A. Refrigeran R404A selain relatif lebih ramah lingkungan dibandingkan dengan R22, juga memiliki temperatur N<em>ormal Boiling Point</em> (NBP) lebih rendah dari R22. Kapasitas kompresor yang digunakan adalah 250 W yang khusus dirancang untuk refrigeran R404A. Berdasarkan pengujian didapatkan bahwa temperatur kabin dapat mencapai -40<sup>o</sup>C setelah 120 menit mesin pendingin dioperasikan. Selama beroperasi, tekanan kerja, yaitu tekanan <em>suction</em> dan <em>discharge</em> kompresor, <em>mini freezer</em> hampir sama dengan hasil perhitungan. Ini artinya metode yang digunakan pada penelitian ini dengan desain dan pengembangan (R&D). Namun untuk mendapatkan <em>freezing time</em> yang lebih singkat masih diperlukan optimasi panjang pipa evaporator masih diperlukan, supaya temperatur kabin -40<sup>o</sup>C dapat dicapai lebih singkat. Perbedaan hasil perancangan, yaitu: tekanan <em>suction</em>, tekanan <em>discharge</em> dan temperatur <em>discharge</em>, dengan hasil pengujian tidak lebih dari 10%.</p>
This research is a follow-up to the findings of the inspection and grounding testing in PKM 2018 activities. The value obtained exceeds 5 ohms. This is not according to the standards based on the General Requirements for Electrical Installation (PUIL) 2011. In the 2019 PKM program activities, evaluation and renovation studies of the installed earthing system which includes: surveying the location to be grounded, drilling for the position of the electrodes to be installed, installation of electrodes equipped with Bentonic material which functions as a binder so that the electrodes with the ground become one and strong, measurement of the earthing value, perform grounding installation, re-measurement of earthing. The earthing value obtained is much smaller than the previous measurement results of 2.83 ohms in the Electronics Laboratory and 2.72 Ohms at the Automation Laboratory of SMKN 1 Cimahi. It is according to the recommended standard PUIL 2011. The PKM team proposes the management of SMKN 1 Cimahi to carry out a routine maintenance and measurement process twice a year on the newly installed earthing system so that the earthing value remains according to the standard.
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