The Effect of Water Impact on The Refrigerant Pipeline Between Compressor and Condensor Cop and Efficiency of Cooling Machine

The purpose of this research is (a) to design and assemble a steam compression cycle cooling machine using the main components on the market (b) to obtain the characteristics of the cooling engine, which includes the Coefficient of Performance (COP) and the efficiency of the cooling engine.      The research was conducted experimentally in the laboratory. The refrigeration machine works by using a steam compression cycle, with the main components: a compressor, an evaporator, a capillary tube and a condenser. The compressor power is 1/6 PK, while the other main components are adjusted to the size of the compressor power. The refrigerant used is R134a. Variations of the research were carried out on the condition of the refrigerant pipe located between the compressor and condenser: (a) without being submerged in water (b) submerged in 0.50 liters of water and (c) submerged in 0.75 liters of water.      The results of the study provide information that the water immersion in the refrigerant pipe which is located between the compressor and condenser affects the COP value and the efficiency of the refrigeration machine. Consecutively (1) without being submerged in water, the COP value is 2.45 and the efficiency is 0.64 (2) submerged in liter of water, the COP value is 2.41 and the efficiency is 0.62 (3) submerged in liter of water, the value COP is 2.34 and efficiency is 0.60. Keywords: COP, efficiency, cooling engine, steam compression cycle, submerged in water

The Effect of the Number of Cooling Pads on the Output Air Condition and Effectiveness of Air Cooler

To get comfortable air, it can be done by using an air conditioner or air cooler. The electrical power used for the air cooler is relatively lower. This research aims to see the effect of the number of cooling pads on the output air condition and on the effectiveness of the air cooler. The research was conducted experimentally. The research was conducted by varying the number of cooling pads used,thick. The distance between the cooling pads is 1.5 cm. The air temperature inlet of the air cooler has a dry bulb air temperature of 30oC with an air humidity (RH) of 60%. The lowest dry bulb air temperature achieved was 24.04 oC when the number of cooling pads was 6 pieces. The highest air cooler effectiveness achieved was 0.99. Research has given satisfactory results. However, research can be developed by varying the cooling pad material or cooling pad pattern in order to obtain a small number of cooling padsKeywords: Air cooler, Effectiveness, Cooling pa

Effects of the Existence of Fan in the Wood Drying Room and the Performance of the Electric Energy Wood Dryer

The purpose of this study is to determine the effect of the presence of a fan in the wood drying room in the drying time of wood. In addition, it is also to determine the performance of the steam compression cycle engine used in wood drying machines and the conditions of air entering and leaving the wood drying room. Wood drying machines work on a source of electrical energy. The research was conducted experimentally. Variations in the study were carried out on the presence of fans in the drying room: (a) there were no fans and (b) there were 2 fans. The dried object is a sengon wood board, which has a length of 2 m, a width of 20 cm, and a thickness of 2 cm. The number of wooden planks is 70 wooden planks of uniform size. The wooden planks before drying have a moisture content of 29.6%, and when dry, have a moisture content of 10%. The research gave the following results: (a) if there are 2 fans in the drying room, the time needed to dry the sengon wood planks is around 42.6 hours, whereas if there is no fan around 49.9 hours (b) the average Coefficient of Performance (COP) of the steam compression cycle engine is 10.65 (c) The air condition enters the drying room when there are 2 fans, has a dry ball air temperature of 40oC with a relative humidity of 32% RH and the air condition when it comes out, has a dry ball air temperature of 28oC with a relative humidity of 73% RH

Inovasi Mesin Pengering Pakaian yang Praktis, Aman dan Ramah Lingkungan

Pada saat ini mesin pengering pakaian sangat diperlukan terutama pada saat musim hujan tiba atau ketika sinar matahari sulit untuk diperoleh. Tujuan dari penelitian ini adalah mendapatkan mesin pengering yang praktis, aman dan ramah lingkungan. Hasil dari pengeringan pakaian ini adalah kondisi pakaian kering yang siap untuk disetrika. Mesin pengering pakaian yang diteliti mempergunakan sumber energi dari listrik. Energi listrik dipergunakan untuk menggerakkan kompresor rotari dan kipas angin. Dalam bekerjanya, mesin pengering mempergunakan mesin siklus kompresi uap dengan komponen utama : kompresor, kondensor, pipa kapiler, evaporator dan peralatan tambahan filter. Kompresor yang dipergunakan sebanyak 2 buah, masing masing sebesar 1 PK, sedangkan ukuran komponen yang lain menyesuaikan dengan besarnya daya kompresor. Untuk mengalirkan udara, dipergunakan 2 kipas angin masing masing berdaya 54 watt. Almari pengering dirancang untuk kapasitas 20 pakaian, dengan ukuran p x l x t : 120 cm x 60 cm x 130 cm, dengan sistem terbuka. Mesin pengering pakaian yang dirakit (a) mampu mengkondisikan udara di dalam lemari tanpa beban, pada suhu udara kering (Tdb) 59,5oC dan dengan kelembaban udara (RH) sekitar 5%. (b) mampu mengeringkan 20 pakaian baju basah hasil perasan tangan sekaligus dalam waktu 120 menit dan mampu mengeringkan 20 pakaian baju basah hasil perasan mesin cuci sekaligus dalam waktu 60 menit. Untuk 15 pakaian basah hasil perasan tangan diperlukan waktu 110 menit. Kata kunci : mesin pengering pakaian, siklus kompresi uap, kecepatan pengeringan

MENINGKATKAN PEMAHAMAN SISTEM PENGKONDISIAN UDARA PADA MOBIL BAGI GURU, LABORAN DAN SISWA BIDANG OTOMOTIF

There existed several problems that occur in several vocational schools related to the results of the implementation of the learning. In some vocational schools majoring in automotive, it was found that: (a) understanding and mastering the material of the car air conditioning system in students was still incomplete and not yet in-depth. (b) students still had difficulty understanding the air conditioning system on the car (c) there is no solution yet to make it easier for students to understand the car's air conditioning system in a complete and in-depth manner. The purpose of this service is to help overcome these problems. The training is intended for teachers, laboratory assistants and vocational students in the automotive department. The methods used were: training, demo, question and answer and joint discussion. The result of this service was an increase in the competence of teachers, laboratory staff and students. Teachers and laboratory assistants: (a) have a more complete and in-depth understanding of air conditioning systems (b) have the ability to design, make/assemble and produce props for air conditioning systems in cars (c) have the ability to develop/innovate in assembling conditioning systems air on the car. Students: (a) get a more complete and in-depth understanding of the material of the air conditioning system in the car (b) it is easier to get an understanding of the air conditioning system material in the car on the car by using the air conditioning system display equipment in the car. Other results of this service were (a) obtaining appropriate technology in the form of visual aids for car conditioning systems and (b) learning methods that facilitate understanding of air conditioning systems in cars

Microcontroller Based Simple Water Flow Rate Control System to Increase the Efficiency of Solar Energy Water Distillation

The current problem of solar energy water distillation is in its low efficiency. Low efficiency is caused by inefficient water evaporation processes. Increasing the efficiency of water evaporation is done by controlling the rate of water entering into the absorber. The commonly used mechanical control system still has weaknesses such as the instability of the water entering the absorber. This causes less effective evaporation of water so that the resulting distillation efficiency is not optimal. The water rate input system for distillation in this study is based on a simple microcontroller. The microcontroller-based input water rate control system allows the rate of input water with a small but continuous flow rate so that the water evaporation process can be more effective. This study aims to improve the efficiency of solar energy water distillation by increasing the efficiency of the water evaporation process through controlling the flow rate of water inlet. The research was carried out by the experimental method. The parameters varied were: the rate of input water which was 0.3 l / hour, 0.5 l / hour and 1.2 l / hour. Parameters measured in this study were: (1) temperature of absorber, (2) temperature of the cover glass , (3) temperature of cooling water, (4) input water temperature, (5) ambient air temperature, (6) distilled water results, (7) solar energy coming in and (8) time of recording data. The results showed that the production of distillation water using microcontroller-based water rate control was a maximum of 523% compared to the model without water rate control at a water flow rate of 0.3 liters / hour, with distillation efficiency of 66%. From the results of this study it can also be concluded that microcontroller based water flow rate controller is more stable than mechanical water flow controller, especially in small flo

Inovasi Mesin Pengering Pakaian yang Praktis, Aman dan Ramah Lingkungan

Pada saat ini mesin pengering pakaian sangat diperlukan terutama pada saat musim hujan tiba atau ketika sinar matahari sulit untuk diperoleh. Tujuan dari penelitian ini adalah mendapatkan mesin pengering yang praktis, aman dan ramah lingkungan. Hasil dari pengeringan pakaian ini adalah kondisi pakaian kering yang siap untuk disetrika. Mesin pengering pakaian yang diteliti mempergunakan sumber energi dari listrik. Energi listrik dipergunakan untuk menggerakkan kompresor rotari dan kipas angin. Dalam bekerjanya, mesin pengering mempergunakan mesin siklus kompresi uap dengan komponen utama : kompresor, kondensor, pipa kapiler, evaporator dan peralatan tambahan filter. Kompresor yang dipergunakan sebanyak 2 buah, masing masing sebesar 1 PK, sedangkan ukuran komponen yang lain menyesuaikan dengan besarnya daya kompresor. Untuk mengalirkan udara, dipergunakan 2 kipas angin masing masing berdaya 54 watt. Almari pengering dirancang untuk kapasitas 20 pakaian, dengan ukuran p x l x t : 120 cm x 60 cm x 130 cm, dengan sistem terbuka. Mesin pengering pakaian yang dirakit (a) mampu mengkondisikan udara di dalam lemari tanpa beban, pada suhu udara kering (Tdb) 59,5oC dan dengan kelembaban udara (RH) sekitar 5%. (b) mampu mengeringkan 20 pakaian baju basah hasil perasan tangan sekaligus dalam waktu 120 menit dan mampu mengeringkan 20 pakaian baju basah hasil perasan mesin cuci sekaligus dalam waktu 60 menit. Untuk 15 pakaian basah hasil perasan tangan diperlukan waktu 110 menit. Kata kunci : mesin pengering pakaian, siklus kompresi uap, kecepatan pengeringan