Agus Pamitran

• University of Indonesia

The high demand of electricity and the diverse of heat source made the researcher do a modification on a power plant. One of the modifications is Organic Rankine Cycle (ORC) system, where the system uses a low heat source. In addition, the system uses refrigerant as a working fluid instead of water. However, the halocarbon refrigerant has a negativ...

Ice slurry is the right medium to maintain the quality of fish catches for the cooling process, because ice slurry can cool the product faster and the growth of bacteria becomes slower without damaging the product. The motivation in this study that during the flow process of ice slurry, the lower viscosity is needed so that the application of ice s...

In this paper, the experimentally research about the heat transfer characteristic of the OHP using methanol and ethanol working fluid for heat recovery implementation. The OHP was manufactured with l eff of approximately 500 mm, which is not typically used in previous OHP data experimental tests. The results of this experimental data will provide m...

Research of two-phase flow boiling in microchannel has been done intensively. Microchannel has been increasingly applied in industrial equipment, especially for cooling system. Measurement of temperature and heat on the test section of microchannel became the main concern on this research. The aims of this research is to study a characteristic of t...

The experimental study of frictional pressure drop of two-phase flow with propane on the microchannel has been done. The aim of the present research is to characterize pressure drop of evaporative propane in microchannel with 500 μm diameter and 0.5 m length. The experimental apparatus used heating process in the test section with closed loop proce...

Due to certain advantages, natural refrigerants have recently become more popular. Environmental issues motivate this study, focused on the characteristics of propane (R-290) as a replacement for conventional refrigerants. The aim of the present research is to characterize the pressure drop of evaporative R-290 in a microchannel of 500µm diameter a...

This study investigates the contributions of different mechanisms of heat transfer in two phase flow boiling heat transfer coefficient for propane (natural refrigerant) in a small channel. The effects of heat flux and mass flux towards maximizing the heat transfer is studied by comparing experimental data from 7.6 mm diameter horizontal channel and...

Many correlations had been and are being developed to predict the heat transfer coefficient in two-phase flow in a mini channel, particularly for new coolants investigated for their low environmental impacts. However, large discrepancies have been reported between the predicted and experimental heat transfer coefficient. Accurate prediction of the...

Predictions of the frictional pressure drop using friction factor correlations that have been developed based on past experimental data have always been found to disagree with recent experimental data. Thus, new correlations are continuously being developed to generalize their applications across refrigerants and flow regimes. The friction factor i...

The search for alternative environmentally friendly refrigerants have never been so crucial with the increasing demand for effective cooling of increasing miniaturization of our heat exchanging devices in the ever expanding air-conditioning and refrigeration industry. Although propane (R290) and ammonia (R717), natural refrigerants, have been aroun...

Two-phase flow boiling pressure drop experiment was conducted to observe its characteristics and to develop a new correlation of void fraction based on the separated model. Investigation is completed on the natural refrigerant R-290 (propane) in a horizontal circular tube with a 7.6 mm inner diameter under experimental conditions of 3.7 to 9.6°C sa...

The major parameters of interest in heat transfer research are the refrigerant charge, pressure drop, and heat transfer capacity. Smaller channels reduce the refrigerant charge with higher heat transfer capability due to the increased in surface area to volume ratio but at the expense of a higher pressure drop. Differences between the predicted and...

Due to its friendly effect on the environment, natural refrigerants could be the best alternative refrigerant to replace conventional refrigerants. The present study was devoted to the effect of superficial velocity on vaporization pressure drop with propane in a horizontal circular tube with an inner diameter of 7.6 mm. The experiments were condit...

An investigation into flow boiling void fraction was conducted to observe its characteristics and to develop a new correlation of void fraction based on the separated model. The study used a natural refrigerant of R-290, flowed in a horizontal tube of 7.6 mm inner diameter under experimental conditions of 3.7 to 9.6°C saturation temperature, 10 to...

The characteristics of two-phase flow boiling of R-290 are required for replacing R-22 that has been phased-out. The present study focuses on experimental pressure drop for R-22 and R-290. The experiment was run with heat flux of 5.09 kW/m² to 19.03 kW/m², mass flux of 114.91 kg/m²s to 751.74 kg/m²s and saturation temperature of 4.77°C to 18.12°C....

Hydrocarbon refrigerants have been widely used to replace HFCs. As hydrocarbon, R-290 has no ODP (Ozone Depletion Potential) and negligible GWP (Global Warming Potential). This paper presents flow boiling heat transfer in small tube with R-290 and R-22. The test tube has inner diameter of 7.6 mm and length of 1.07 m. In order to determine the heat...

This study experimentally investigated two-phase flow pressure drop of propane as refrigerant in horizontal small tube. Inner diameter and length of the tube were 7.6 mm and 1.07 m, respectively. In order to get pressure drop data, the experiment was conducted in various conditions of 10 to 25 kW m⁻² heat flux, 200 to 628 kg m⁻² s⁻¹ mass flux, and...

Every engine needs a cooling system in order to maintain the performance of engine. In this study the cooling system is applied in naval ship with the exchange of freshwater and seawater. Since the seawater contains biological fouling, then it is scaled in the heat exchanger so that the performance of heat exchanger is decreasing from time to time....

Substantial research has been completed with more on-going on the flow pattern and heat transfer associated with two-phase flows. Discrepancies reported may have been as much as agreements, due to the different models, approaches, flow regimes, correlations, and new working fluids being utilized. This paper reports the outcome of a study to look at...

Research in energy and material efficiencies has never been more important due to the current global policies towards a sustainable future. Compact heat exchangers involving the complexities of two-phase flows, with their decreasing channel size and low environmentally friendly coolant mass requirement, necessitate intensive investigations into the...

A more effective of cooling method is necessary for fish storage to get high quality and long freshness of fish. Ice block is not sufficient for fish storage because of its hard-solid surface that can damage the fish. Moreover for some remote area it is difficult to find ice block in good time with reasonable/low price. One solution for this proble...

Sea-water ice slurry generator is aimed to produce ice-slurry using sea-water while fishing on boat. Some models of ice slurry generator have been researched and developed. Indonesia as an archipelago and maritime nation has big potential in fishery. Appropriate model for Indonesian traditional fishing boat is necessary. The most important part of...

An experimental study of evaporation heat transfer coefficients for single circular small tubes was conducted for the flow of C3H8, NH3, and CO2 under various flow conditions. The test matrix encompasses the entire quality range from 0.0 to 1.0, mass fluxes from 50 to 600 kg m−2 s−1, heat fluxes from 5 to 70 kW m−2, and saturation temperatures from...

An experimental investigation on two-phase flow boiling heat transfer with refrigerants of R-22, R-134a, R-410A, C3H8 and CO2 in horizontal circular small tubes is presented. The experimental data were obtained over a heat flux range of 5–40 kW m−2, mass flux range of 50–600 kg m−2 s−1, saturation temperature range of 0–15 °C, and quality up to 1.0...

An experimental investigation on the characteristics of two-phase flow pattern transitions and pressure drop of R-22, R-134a, R-410A, R-290 and R-744 in horizontal small stainless steel tubes of 0.5, 1.5 and 3.0mm inner diameters is presented. Experimental data were obtained over a heat flux range of 5–40kW/m2, mass flux range of 50–600kg/(m2s), sa...

An experimental investigation on the characteristics of two-phase boiling heat transfer of NH3 , C3 H8 and CO2 in horizontal small stainless steel tubes of 1.5 and 3.0 mm inner diameters are presented in this paper. Experimental data were obtained over a heat flux range of 5 to 70 kW/m2 , mass flux range of 50 to 600 kg/m2 s, saturation temperature...

This study examined the two-phase flow boiling pressure drop and heat transfer for propane, as a long term alternative refrigerant, in horizontal minichannels. The pressure drop and local heat transfer coefficients were obtained for heat fluxes ranging from 5–20 kW m−2, mass fluxes ranging from 50–400 kg m−2 s−1, saturation temperatures of 10, 5 an...

Experiments were performed on the convective boiling heat transfer in horizontal minichannels using propane. The test section was made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and lengths of 1000 mm and 2000 mm, respectively, and it was uniformly heated by applying an electric current directly to the tubes. Local heat tran...

An experimental study of R-22 and R-134a two-phase vaporization in horizontal minichannel was reported. In order to obtain the local heat transfer coefficients, the test was ran under heat flux range of 10 to 40 kW m -2, mass flux range of 200 to 600 kg m-2 s-1, saturation temperature range of 5 to 10°C, and quality up to 1.0. The test section, whi...

Pressure drop experiments for a natural refrigerant vaporization of CO2 were performed in horizontal minichannels. The test section was made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and with lengths of 2000 and 3000 mm. This test section was uniformly heated by applying electric current directly to the tubes. Experiments w...

Convective boiling pressure drop experiments were performed in horizontal minichannels with a binary mixture refrigerant, R-410A. The test section was made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and with lengths of 1500 mm and 3000 mm, respectively. This test section was uniformly heated by applying electric current dire...

This study examined convective boiling heat transfer in horizontal minichannels using R-22, R-134a, and CO2. The local heat transfer coefficients were obtained for heat fluxes ranging from 10 to 40 kW m−2, mass fluxes ranging from 200 to 600 kg m−2 s−1, a saturation temperature of 10 °C, and quality up to 1.0. The test section was made of stainless...

Experiments were performed on the convective boiling heat transfer in horizontal minichannels with CO2. The test section is made of stainless steel tubes with inner diameters of 1.5 and 3.0 mm and with lengths of 2000 and 3000 mm, respectively, and it is uniformly heated by applying an electric current directly to the tubes. Local heat transfer coe...

Convective boiling heat transfer experiments were performed in horizontal minichannels with binary mixture refrigerant, R-410A. The test section is made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and with lengths of 1500 mm and 3000 mm, respectively, and is uniformly heated by applying electric current directly to the tubes....

An experimental study of boiling heat transfer with refrigerants R-410A and R-407C is presented. The present paper is focused on pressure drop and boiling heat transfer coefficient of the refrigerants inside a horizontal smooth minichannel. To evaluate the diameter size effect on pressure and heat transfer characteristics, minichannels with inner d...