Browsing by Author "Mainil, Afdhal Kurniawan"
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Item Energy Efficient Cold Storage As Hybrid Refrigeration Machine Using Heating Effect From Condenser With Hydrocarbon Refrigerant Substituted For R-22(2016-04-19) Aziz, Azridjal; Herisiswanto; Mainil, Afdhal KurniawanThe most commonly used refrigeration cycle is the vapor-compression refrigeration cycle. Amount of energy required to produce a cooling effect. On the other hand, the heat removed by the system to the environment to keep the principles of thermodynamics. In this study was developed a system that uses the principles of refrigeration and heat pumps in one machine (hybrid refrigeration systems). The aim of this study is to investigate the characteristics of vapor compression hybrid system using hydrocarbon refrigerants substituted for R-22. The use of hydrocarbon refrigerants mass (HCR-22) optimum for this hybrid system is 0.4 kg at 2.546 of COP. Energy saving for heating effect is 58.12% which can be used for heating or drying. The use of dummy coil for hot water in condenser is important for maintaining the thermodynamic stability of hybrid system. The average temperature difference between the heating or cooling coil to the temperature of hot or cold room is in the range 3 - 5°C. The 45 L of water in the box could be use as thermal energy storage with initial temperature 0°C at ice on the coil conditions to maintain a cold room at a temperature of 24°C along 120 minutesItem Pengaruh Laju Aliran Air Terhadap Performansi Mesin Pengkondisian Udara Hibrida Dengan Kondensor Dummy Tipe Multi Helical Coil Sebagai Water Heater(2016-04-26) Aziz, Azridjal; Fikri, Sarwo; Mainil, Afdhal Kurniawan; Mainil, Rahmat ImanPenggunaan Ac sebagai penyejuk udara sekaligus sebagai pemanas air (water heater) memanfaatkan panas buang kondensor dummy untuk peningkatan efisiensi mesin disebut sebagai mesin pengkondisian udara hibrida (AC hibrida). Kondensor dummy tipe multi helical coil sebagai water heater yang ditambahkan antara kondensor dan kompresor dari sebuah mesin AC diletakkan di dalam tangki air berkapsitas 50l. kaji eksperimental pada penelitian ini dilakukan untuk mengetahui seberapa besar pengaruh laju aliran air keluar tangki penyimpanan pada kondensor dummy terhadap performansi mesin AC hibrida. Katup aliran air diatur pada laju 0L/s (katup tertutup), 0.31L/s, 0.059L/s dan 0.086 L/s dengan beban pendingin 1000W. hasil penelitian menunjukkan bahwa, semakin tinggi laju aliran air, maka temperature air yang dihasilkan semakin menurun. Temperature air rata-rata tertinggi yaitu 50.43’C pada laju aliran 0.086L/s (bukan katup penuh). Kerja kompresor makin rendah dengan makin tingginya laju aliran air, karena semakin tinggi laju aliran air, temperature atau tekanan kompresor semakin rendah sehingga konsumsi energinya juga rendah. COP trtinggi diperoleh pada laju aliran air 0.031L/s baik sebagai COPc (sebagai pendingin)maupun COPcw(sebagai pendingin dan pemanas). Tidak ada pengaruh yang berarti terhadap temperature ruangan akibat peningkatan laju alira air, karena perbedaannya sangat kecil yaitu pada rentang 0.91’C -1.26’C.Item Penggunaan Encapsulated Ice Thermal Energy Storage Pada Residential Air Conditioning Menggunakan Refrigeran Hidrokarbonsubstitusi R-22 Yang Ramah Lingkungan(2016-04-23) Aziz, Azridjal; Mainil, Afdhal KurniawanResidential air conditioning is the wide option used to get the cool and comfortable in house. Improvement usage of AC caused by the good recovery of economics and the good range of price AC for residential achieved, especially for the family form middle to up level. Escalation usage of AC in the residental caused by increase the environmental air temperature heat as effect of climate chage (global warming). Usage of AC for house or residential, so that most expense of electricity 45%-66% from tatalizing usage of electricity for house or residential, so tha most expense of electricity invoice used to pay for the freshness wich obtainable. Usage of encapsulated ice thermal energy storage at residential AC system can economize the use of electricity 20%-60%, this matter because the using compressor most replaced by pump to distribute the chilled fluid. Electricity cost-saving also can be improved with the use of hydrocarbon refrigerant as substitution of R22 refrigerant, wich can economize the usage of electricity 10%-20%. Can conluded that usage of encapsulated ice termal energy storage at residential air conditioning of vapor compression refrigeranttion machine with hydrocarbon refrigerant as substitution R-22 refrigerant can cost economize that required to get the comfortable room to various use conditionItem Penggunaan Modul Thermoelectric Sebagai Elemen Pendingin Box Cooler(2016-04-26) Mainil, Rahmat Iman; Aziz, Azridjal; Mainil, Afdhal KurniawanPenelitian ini menngunakan modul thermoelectric sebagai elemen pendingin box cooler telah dilakukan.pada penelitian ini modul tehermolectrik digunakan sebagai elemen pendingin untuk mendinginkan sebuah ruang dingin box cooler. Jumlah modul pendingin yang digunakan serta beban kalori yang diserap pada sisi dingin dan kalor yang dibuang pada sisi panas menggunakan heat sink yang digabungkan denagn fan pendingin untuk mempercepat proses penyerapan atau pembuangan kalor yang lebih baik dari sisi dingin. Pengujian dilakukan dengan memvariasikan pengujian box cooler menggunakan beban pendingin dan tanpa beban pendingin. Hasil pengujian menunjukkan waktu yang dibutuhkan untuk mendinginkan ruangan pendingin tanpa menggunakan beban adalah 36 menit dengan temperature stasioner 18.6c rata-rata perbedaaan temperature cold sink 2.1CItem Performansi Mesin Pendingin Tipe Chiller untuk Cold Storage dan Indoor Menggunakan Ethylene Glycol Coolant(2016-04-16) Aziz, Azridjal; Syahputra, Hendrik; Mainil, Rahmat Iman; Mainil, Afdhal KurniawanRefrigeration device is used to reduce the temperature of the room or cooled material by absorbing heat from the room/material. The most refrigeration device operated by using the vapor compression refrigeration cycle. This research was done experimentally using refrigeration device chiller type to cool the ethylene glycol coolant in the refrigeration box (evaporator unit), and ethylene glycol coolant is used to absorb heat in cold storage and indoor (test room). The results show for the circulation of ethylene glycol coolant to the cold storage COP value is 2.80, while the circulation of ethylene glycol coolant to the indoor COP value is 5.12. On the testing of ethylene glycol coolant was circulated to the indoor with 1000 Watt cooling load, the COP value is 5.19, and for circulated to the cold storage and indoor simultaneously COP is of 3.66. The performance of chiller refrigeration device is influenced by the cooling load, the greater of cooling load that would affect the work of the compressor so that the pressure in compressor increase and the energy consumption to operate the compressor also increasing too.Item Performansi Modular Chiller Kapasitas 120 TR(2016-04-16) Aziz, Azridjal; Harianto, Joko; Mainil, Afdhal KurniawanModular chiller is a central Air Conditioning (AC) system, which consists of several modules that work together to reject the heat that absorbed by the chilled water from the building to be discharged into the environment. Chiller type is also a solution for the efficient use of electrical energy due to the number of units in operation can adjust to the heat load generated by the building. Heat load tends to fluctuate depending on the amount of space used, the number of electronic tools are used, the number of people in activity, and other heat load factors. Chiller is operated at setting temperature 6oC. The analysis showed that the actual cooling capacity (QL) in the evaporator, the actual compressor power (Wk) and the actual waste heat capacity (QH) in the condenser respectively are 357.5 kW to the total 845 kW cooling capacity availability, 66.1 kW to the total 157 kW of power compressor, and 423.6 kW to the total 1002 kW of the potential heat rejected by condenser, with COP of the chiller is 5.4. Cooling capacity provided 57.7% greater than the total cooling capacity actual, so it is more than enough to meet the overall cooling load at the Y hotel, to obtain the appropriate thermal comfort standard by SNI 03-6572-2001.Item Potensi Pemanfaatan Energi Panas Terbuang Pada Kondensor Ac Sentral Untuk Pemanas Air Hemat Energi(2016-04-16) Aziz, Azridjal; Harianto, Joko; Mainil, Afdhal KurniawanCentral air conditioning is one type of refrigeration machine that is widely used in large or multi-storey buildings such as offices, hotels or shopping malls. Waste heat energy from the condenser of refrigeration machine is generally rejected as useless energy. Actually, this thermal energy can be utilized for energy-efficient water heater, as a source of energy obtained for free from the condenser waste heat energy. To determine the wasted heat energy that can be used for the water heater, it is necessary to count the heating potential. The calculation and analysis of data obtained showed that the energy potential of waste heat in the condenser that can be used as a water heater is equal to 228.318 kW with a maximum condenser inlet temperature is 57.78 °C.