International journal of physical sciences and engineering 2019-08-31T00:00:00+00:00 Prof. Joan Manuel Rodríguez Diaz, Ph.D. Open Journal Systems <p style="text-align: justify;"><strong>IJPSE</strong>&nbsp;is published in English and it is open to authors around the world regardless of the nationality. It is currently published three times a year, i.e. in&nbsp;<em>April</em>,&nbsp;<em>August</em>, and&nbsp;<em>December</em>.&nbsp;&nbsp;</p> Design of eco-friendly refrigeration system 2019-08-19T11:44:00+00:00 Ricardo Fabricio Muñoz Farfán Telly Yarita Macías Zambrano Víctor Manuel Delgado Sosa Vicente Zambrano <p style="text-align: justify;">The present study of a freezing system has developed based on an air conditioning system, whose purpose is to take advantage of the technological transfer of cold producing equipment for food storage and conservation uses. The installed capacity of 9000 BTU/Hr was considered for the choice of equipment. We studied the freezing process of fish, water, and the preservation of legumes with a volume of 1 kg per product individually. The freezing temperature has evaluated with a mechanical compression refrigeration system of Gas R22 with temperature interactions of 29.6 ° C to -12 ° C. and monitored with a Proportional Integrative Derivative (PID) controller. For production cost, the equipment was mostly made of its parts and pieces with recycling material. A descriptive experimental design has carried out, for the verification of results. The equipment managed to reach chamber temperatures of -13 ° C from 20 minutes once the equipment (compressor) has turned on under specific product descriptions.</p> 2019-05-14T03:21:10+00:00 ##submission.copyrightStatement## Comparative Study on NDVI with RVI for Estimated Area and Class Distribution 2019-08-19T11:44:48+00:00 I Made Yuliara Ni Nyoman Ratini I Gde Antha Kasmawan <p style="text-align: justify;">This study aims to determine the differences and comparison of the results of the estimated area, the distribution of clove vegetation using the <em>Normalized Difference Vegetation Index (NDVI) </em>and <em>Ratio Vegetation Index (RVI)</em> and to choose a vegetation index that is more suitable for clove vegetation analysis in Buleleng district, Bali. The method used is to compare statistically descriptive area and distribution class produced by the NDVI and RVI models with area data from the Forestry and Plantation Service (FPS), Buleleng regency, Bali in 2014, amounting to 7622.32 ha. The estimated area of ??clove vegetation by the NDVI model was 7852.68 ha and the RVI model was 7669.44 ha. There is an estimated difference in the area of ??clove vegetation of 183.24 ha and a difference in the broad class category of 2453.85 ha for the Rare class (NDVI &gt; RVI) category, for the Medium class of 1611.45 ha (RVI &gt; NDVI), and for the Dense class of 659.16 ha (RVI &gt; NDVI). Comparison of the area with FPS data obtained 97.07% for the NDVI model and 99.39% for the RVI model. This shows that the RVI model vegetation index is more suitable for use in the estimation of the area and class of clove vegetation distribution in Buleleng regency, Bali.</p> 2019-08-12T09:07:59+00:00 ##submission.copyrightStatement##