UR - Scientific Work Lecturer

Permanent URI for this community

https://repository.unri.ac.id/handle/123456789/2818

Browse

Browsing UR - Scientific Work Lecturer by Subject "AC"

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    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 Iman
    Penggunaan 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.
  • No Thumbnail Available
    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 Kurniawan
    Residential 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 condition
  • No Thumbnail Available
    Item
    A Systematic Approach for the Selection of Contract Strategies for Water Projects
    (wahyu sari yeni, 2018-09-04) Sandyavitri, Ari
    This paper describes the use of the ‘Pendulum Obligation Diagram’ (POD) and a set of ‘Assessment Criteria’ (AC) assisting decision-making process in selecting contract strategies for construction, operation and maintenance of new water supply projects in Padang City, Indonesia. The use of POD and AC are useful in comparing the relative merits of alternative contract strategies in the financing and developing of water supply projects. Various options were developed, it was summarized that a full concession contract will best meet most of the project requirements on fresh capital investment and is also attractive to investors as the projected IRR is relatively high (14.27%) and CPBT is relatively short (12.99 years) and a BOT contract strategy could meet partial project requirements with the IRR is 14.42% and CPBT is 10.41 years