Cooling power characteristics of half-cycle refrigeration system in LPG fuelled vehicles by auxiliary chiller as heat exchanger

Setiyo, Muji; Purnomo, Bagiyo Condro; Waluyo, Budi; Munahar, Suroto; Rochman, Muhammad Latifur; Saleh, Arif Rahman; Fatmaryanti, Siska Desy; Samuel, Olusegun David

doi:10.1016/j.tsep.2021.101145

Cited by 3 publications

(4 citation statements)

References 45 publications

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“…where t i_air_in , t i_air_out -cooling air temperatures at the model inlet and outlet, K. Knowing the values of local heat loss coefficients, we can proceed with the determination of the local Nusselt criteria values according to Equation (3) [24,25].…”

Section: Numerical Simulation Methodsmentioning

confidence: 99%

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

Osipov

Rogalev

et al. 2022

Inventions

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Loop and semi-loop cooling schemes are widely used for the high-temperature gas turbine blades. In such schemes, the mid-chord airfoil parts are traditionally cooled by radial channels with ribbed walls. The blades with a small specific span, or “short” blades, have different heat flux amounts on pressure and suction sides, which results in a temperature difference in these sides of 100–150 °K. This difference causes thermal stresses and reduces the long-term strength margins. This paper presents a new method of heat transfer intensification in the ribbed radial cooling channels. The method is based on air streams’ injection through holes in the ribs that split channels. The streams are directed along the walls into the stagnation zones behind the ribs. The results of a 3D coolant flow simulation with ANSYS CFX code show the influence of the geometry parameters upon the channel heat transfer asymmetry. In the Reynolds number within a range of 6000–20,000, the method provides the heat transfer augmentation difference by up to 40% on the opposite channel walls. Test results presented in the criteria relations form allow for the calculation of mean the heat transfer coefficient along the channel length.

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Section: Numerical Simulation Methodsmentioning

confidence: 99%

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

Osipov

Rogalev

et al. 2022

Inventions

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“…Baru baru ini, diperkenalkan sebuah penelitian tentang penggunaan sistem AC menggunakan Liquified Petoleum Gas (LPG) sebagai pengganti refrigerant sekaligus sebagai bahan bakar kendaraan. Penelitian ini memanfaatkan temperatur yang rendah pada vaporizer untuk mendinginkan kabin dengan air sebagai media penghantarnya dan diperoleh kapasitas pendinginan sebesar 124,5 watt [3] . Selanjutnya, pada tahun 2020 sebuah penelitian menggunakan mini air cooler juga telah dilakukan.…”

Section: Pendahuluanunclassified

“…Daya pendinginan dapat diukur tetapi tidak dapat mewakili konsumsi LPG nyata pada kapasitas dan beban mesin tertentu. Kemudian, hasil riset tersebut diperbaiki pada periode selanjutnya yang mewakili kinerja pada kondisi yang sebenarnya [3], [19] .…”

Section: Pendahuluanunclassified

Studi Eksperimen Kinerja Sistem Refrigerasi Setengah Siklus Pada Kendaraan Berbahan Bakar LPG

Ryastama,

Prakasa,

Rochman

et al. 2023

JRM

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The Air Conditioning (AC) system is an important requirement for vehicle passengers to get thermal comfort. However, the AC system draws power from the engine to drive the compressor. Meanwhile, vehicles driven by Liquefied Petroleum Gas (LPG) provide decent cooling potential to assist the main air conditioning system. Therefore, this study aims to examine the effect of cooling on LPG-fueled vehicles by utilizing LPG flow to be used as a secondary refrigerant. The research was carried out on a 1495 cc engine with a special evaporator which was tested at variations of blower speed 1, 2, and 3. The tests were carried out at engine speeds of 1000, 2000, and 3000 rpm. The results showed the lowest cooling effect at blower speed level 1 with engine speed of 1000 rpm and the highest at blower speed level 3 with engine speed of 3000 rpm. The greatest cooling effect is obtained at 373 Watts at 3000 rpm engine speed and level 3 blower speed.

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“…Yang et al [18] developed a unique metric called droplet suspension rate coupled with an optimisation design approach and carried out tests to validate it in order to solve this issue. An experimental study was done by Setiyo et al [19] on the utilization of heat of vaporization of Liquefied Petroleum Gas (LPG) in a vehicle to take part in cooling in the cabin, which is otherwise taken from engine coolant. It is concluded from the test results that this setup can be useful to assist the primary Air-Conditioning (AC) system.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Influence of Extent and Position of a Bypass on the Performance of a Single Unit Liquid Desiccant Based Evaporative Cooler

Pamu

2024

JMechE

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Air-conditioning of buildings is more energy-consuming with widely used vapour compression refrigeration systems in hot and humid areas. Alternatively, evaporative cooling does not show much effect in sultry regions because of increased humidity despite the minimum energy consumption. Indirect evaporative cooling is a promising alternative to direct evaporative cooling systems, but it suffers from low cooling effectiveness and is unsuitable for highly humid regions. Considering the above facts an alternative liquid desiccant-assisted modified M-cycle cooling system is proposed and examined numerically in the present work. The proposed cooling and dehumidification system is a simple unit incorporating chemical dehumidification and regenerative evaporative cooling in a single unit. A simultaneous heat and mass transfer model is developed for the numerical analysis. The numerical code is written in MATLAB and is validated with results available in the literature. Further, numerical analysis was carried out for the effect of various parameters on the performance of the proposed cooling system. The study shows an improvement of 19.2% in dew point effectiveness by incorporating an intermediate opening in the plate separating the product air and working air channels.

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Cooling power characteristics of half-cycle refrigeration system in LPG fuelled vehicles by auxiliary chiller as heat exchanger

Cited by 3 publications

References 45 publications

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

Asymmetric Method of Heat Transfer Intensification in Radial Channels of Gas Turbine Blades

Studi Eksperimen Kinerja Sistem Refrigerasi Setengah Siklus Pada Kendaraan Berbahan Bakar LPG

Numerical Investigation of Influence of Extent and Position of a Bypass on the Performance of a Single Unit Liquid Desiccant Based Evaporative Cooler

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