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All Journal ARMATUR : Artikel Teknik Mesin dan Manufaktur Widya Dharma Journal of Business
Budi Santoso, Gunawan
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Aerospace Engineering Automotive Engineering Economics, Econometrics & Finance Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering

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MODEL PERILAKU BELI VAKSIN BERLABEL HALAL PADA KONSUMEN MUSLIM: SUATU KONSEPTUAL MODEL Sri Nugroho, Arif Julianto; Budi Santoso, Gunawan; Herawati, Nanik
Widya Dharma Journal of Business - WIJoB Vol. 3 No. 2 (2024): Oktober 2024
Publisher : FAKULTAS EKONOMI DAN PSIKOLOGI UNWIDHA KLATEN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54840/wijob.v3i2.295

Abstract

Tujuan penelitian ini menguji peubah gayut perilaku beli vaksin berlabel halal dipengaruhi tiga peubah bebas yaitu nilai- nilai keyakinan konsumen terhadap vaksin label halal, keamanan-produk terpersepsi dan kesehatan-produk terpersepsi dengan satu peubah pemoderasi religiusitas-terpersepsi. Disain penelitian berupa riset kuantitatif survey. Teknik pengambilan sampel dalam riset awaltahun pertama dilakukan secara purposive sampling. Responden diambil sebagai sampel merupakan konsumen Muslim dewasa yang telah mengonsumsi vaksin label halal Flu-Bio, CoronaVac dan Vac2Bio di wilayah Kabupaten Klaten sejumlah 100 responden. Uji kuantitatif terhadap model dilakukan secara Structural Equation Model. Tahapan uji model meliputi uji kesahihan dan keandalan indikator, uji deskriptif responden dan deskriptif peubah, uji statistik inferensial, uji asumsi klasik serta uji peubah moderator multi-grup. Uji peubah pemoderasi menggunakan alat bantu program statistik perangkat lunak AMOS 21
Analisis Energy Efficiency Ratio (EER) pada AC Split yang Diretrofit dari Refrigeran R32 ke R290 dengan Massa Pengisian 40 Persen Ulum, Rizka; Budi Santoso, Gunawan; Ngatmin; Susanto; Anang Budhi Nugroho, Anang; Pujianto, M. Edi
ARMATUR : Artikel Teknik Mesin & Manufaktur Vol. 7 No. 1 (2026): Jurnal Armatur (in Progress)
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/armatur.v7i1.10830

Abstract

The extensive use of split-air conditioning in tropical countries raises environmental concerns because of the high global warming potential of R32 refrigerant. The hydrocarbon refrigerant R290 offers a promising alternative with a very low gross pollutant content (less than 4) and a near-zero ozone depletion potential. However, its flammability and impact on performance at reduced charge densities require further investigation. This study assesses the energy efficiency ratio (EER) of 1 PK split AC retrofitted with 40% charge weight from R32 to R290. The experimental tests were carried out under five operating conditions with room temperature of 23-27 degrees Celsius and ambient temperature of 30-35 degrees Celsius. System parameters including pressures, temperatures, compressor power consumption and the flow rate of the refrigerant were measured. The software REPROP was used for the thermodynamic analysis and the EER calculation. The results show that R32 achieves a higher EER (24.59-26.35 Btu per kWh) than R290 (15.33-17.21 Btu per kWh), resulting in a reduction of efficiency of 30-45 percent. Although R290 showed lower power consumption (0.446-0.476 kW compared to 0.76-0.82 kW in R32), the reduced mass flow rate reduced the cooling capacity. The study concluded that the 40 percent R290 retrofit reduces energy consumption but compromises energy efficiency, which requires further research on optimised weight and system components.
Co-Authors Anang Budhi Nugroho, Anang Arif Julianto Sri Nugroho Nanik Herawati Ngatmin Pujianto, M. Edi SUSANTO Ulum, Rizka