Ricki Murti - Academia.edu (original) (raw)
Papers by Ricki Murti
IOP Conference Series: Materials Science and Engineering, 2019
Smart technologies are the scientific knowledge application that develops into computer technolog... more Smart technologies are the scientific knowledge application that develops into computer technology. Central Processing Unit (CPU) is a computer hardware that carries out the computer program instructions. The CPU technology development is very fast with the impression of smaller dimensions yet maintain its performance and efficiency, this results in a heat flux or overheating that should be reduced and even removed from the CPU system to maintain the CPU performance and life because the overheating could potentially damage and slow down the computer work. To solve the CPU heat flux problem, we use heat pipes as the cooling system, because of its ability to transfer heat and contribute to the high outlet temperature in the condenser. The cascade heat pipe design is made by combining two heat pipes into one. The design is expected to be able to reduce the processor temperature by 2.74°C at the idle condition, 1.48°C at maximum conditions, and condenser section by 14.94°C at the idle c...
IOP Conference Series: Materials Science and Engineering, 2019
The development of electronic device is moving toward Smart Technologies, But, the idea of Smart ... more The development of electronic device is moving toward Smart Technologies, But, the idea of Smart Technologies brings a new problem to heat flux management because the device produces more heat to be banished, especially CPU. So to solve those problems, heat pipe was chosen to be an alternative solution. Heat pipe was hoped to be a passive cooling system technology, but further research shows that goal can’t be achieved, due to the high condenser temperature, and the cooling system still needs fan support to banish the heat quickly from the device. So, this paper will discuss a research about new cascade system for heat pipe with variations of heat load and amount of condenser. The results were compared to non-cascade heat pipe to know its thermal performance, especially in thermal resistance. The results show that application of cascade straight heat pipe is effective to solve high condenser temperature problem. In thermal resistance, non-cascade heat pipe still better, but the diff...
Jurnal Energi Dan Manufaktur, 2012
In a drying process usually used forced flow condition. The energy used a dryer is usually only a... more In a drying process usually used forced flow condition. The energy used a dryer is usually only a single type of energy. Thus,the study is conducted on the natural flow dryer system by using the chimney. The energy used as a dryer is solar energy andbiomass that can be used simultaneously or one turns in accordance with the needs and circumstances. Has done testing of aprototype natural flow dryers utilize a combination of solar collectors energy and biomass furnace. Testing is done threetimes a process by measuring the following: the inlet air temperature of the biomass furnace, the outlet air temperature of thebiomass furnace, the inlet air temperature of the solar collector, the outlet air temperature of the solar collector, airtemperature into the drying chamber, air temperature out of the drying chamber, the mass decreasing of dried material, andthe intensity of solar radiation. Data were collected at each interval of 30 minutes was followed by processing of these datato obtain...
Jurnal Energi Dan Manufaktur, 2009
Radiator is one of heat exchanger applications that has a function to remove out of heat must be ... more Radiator is one of heat exchanger applications that has a function to remove out of heat must be able to operate properly for allowed engine temperature limit. Vehicles that operate on the street usually driving with varying rpm so that the heat produced by the combustion process is not constant and then this study analyze the performance of radiators as a function of time (transient condition). Tests is done on the condition of operating the engine with five rpm variations, each for one hour with air conditioning load and without air-conditioning load. The data to be collected includ the inlet and outlet temperature of radiator and radiator fluid volume flow. The results obtained is heat exhausted rate as a performance radiator is increasing as with increasing of engine rpm and at load conditions with the AC produces heat exhausted rate is greater than AC without AC load. The heat exhausted rate in an hour of machine operation still shows the system operates at a transient conditio...
International Journal of Technology, 2020
Jurnal Energi Dan Manufaktur, 2008
Mobil yang digunakan untuk menempuh perjalanan yang jauh biasanya dipacu dengan kecepatan yang cu... more Mobil yang digunakan untuk menempuh perjalanan yang jauh biasanya dipacu dengan kecepatan yang cukup tinggi dengan putaran mesin berkisar pada rpm 2000 dan dalam jangka waktu yang cukup lama. Agar tidak terjadi hal-hal yang tidak diinginkan akibat suhu mesin melebihi suhu normal mesin saat bekerja, maka penelitian ini perlu dilakukan. Pada penelitian ini dilakukan pengujian perbandingan laju pembuangan panas mesin antara pemakaian 100% air dengan campuran 80% air dan 20% radiator coolant dengan metode paired comparison pada rpm 2000. Dari penelitian tersebut diambil data antara lain temperatur masuk dan keluar radiator, dan volume aliran fluida radiator (Q) yang kemudian dilakukan pengolahan data untuk menentukan laju aliran massa (m), panas spesifik fluida (Cp), laju pembuangan panas radiator (q), dan pengolahan data secara statistik. Hasil pengujian terhadap campuran fluida radiator 80% air dan 20% radiator coolant menunjukkan rata – rata selisih temperatur inlet radiator dengan t...
There have been many studies about the dryer with a static bed so dry material produced is not un... more There have been many studies about the dryer with a static bed so dry material produced is not uniform. Thus, drying withrotating bed can produce the dry material uniformly. Usually a prototype closest to the efficiency of the system as aperformance, but it has not been able to show its thermal energy balance. So the target of this research is a transient thermalenergy balance. Data taken in the testing include: the temperature inlet fluid of drying chamber channel (Tin), the velocity offluid flow into drying chamber channel (V), the outlet fluid temperature from drying chamber channel (Tout), the temperatureof dried material (Tmtl), the mass of dried material (mmtl), the surface temperature in the drying chamber wall (Tdlm), surfacetemperature out the drying chamber wall (Tluar). Next step is to get the results of data processing in the form of transientthermal energy balance in tables and graphs. From the results it can be seen that the useful energy decreases with timealthough th...
Efficiency of sea-water Distillator is a ratio between evaporation-condensation to the solar inte... more Efficiency of sea-water Distillator is a ratio between evaporation-condensation to the solar intensity. When the solar intensity decreases dramatically, the decrease of evaporation-condensation speed is moderate. This occurs because of the exist of collected energy at the basin that can be vaporized the sea-water, so then the analysis here is transient analysis, and the steady state analysis can not be applied. Design and prototype of sea-water distillator by using solar energy are developed. Investigation is conducted to obtain the performance of the prototype within 3-process experiments. Data are collected and calculations are conducted, and results are performed in the table. The results of calculation are arranged on the graphs. Then, the analysis are performed based on the grapsh. Design of prototype is with area of basin surface of (1 x 1) m 2 . From the experiments, it can be concluded that the prototype runs well. The water product from the prototype has been checked and re...
In a drying process usually used forced flow condition. The energy used a dryer is usually only a... more In a drying process usually used forced flow condition. The energy used a dryer is usually only a single type of energy. Thus,the study is conducted on the natural flow dryer system by using the chimney. The energy used as a dryer is solar energy andbiomass that can be used simultaneously or one turns in accordance with the needs and circumstances. Has done testing of aprototype natural flow dryers utilize a combination of solar collectors energy and biomass furnace. Testing is done threetimes a process by measuring the following: the inlet air temperature of the biomass furnace, the outlet air temperature of thebiomass furnace, the inlet air temperature of the solar collector, the outlet air temperature of the solar collector, airtemperature into the drying chamber, air temperature out of the drying chamber, the mass decreasing of dried material, andthe intensity of solar radiation. Data were collected at each interval of 30 minutes was followed by processing of these datato obtain...
Biasanya dalam proses pengeringan, pelat logam tipis dilapisi waraa hitam digunakan sebagai penye... more Biasanya dalam proses pengeringan, pelat logam tipis dilapisi waraa hitam digunakan sebagai penyerap radiasi matahari. Pelat logam harganya mahal, sehingga penggunaaniiya tidak memungkinkan bagi masyarakat pedesaan yang mempunyai penghasilan rendah untuk mengeringkan hasil panennya seperti : padi, jagung, kacang dan Iain-lain. Temperatur udara untuk proses pengeringan umumnya tidak terlalu tinggi kira-kira 45AâA°C - 55AâA°C. Mengingat kebutuhan tersebut maka memungkinkan penggunaan batu krikil yang dicat hitam sebagai pengganti pelat logam. Telah didesain dan dibuat sebuah prototipe alat pengering tenaga surya dengan menggunakan batu krikil sebagai kolektor. Dimensi kolektor adalah lebar 0,9 m dan panjang 1,4 m. Alat ini digunakan untuk kapasitas pengeringan gabah 25 kg. Karena massa kolektor terbuat dari krikil, relatif besar terhadap massa pelat logam,maka metode unsteadi-state digunakan dalam perhitungan performansi pengeringan tenaga surya. Dari percobaan didapat efisi...
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Computer will overheat quickly if used in a state of full load continuously. One component on a c... more Computer will overheat quickly if used in a state of full load continuously. One component on a computer that generates heat is the central processing unit (CPU) which is a key component on a computer where program instructions are processed. One of the right solutions to cool the CPU is the use of heat pipes as cooling system, using several size container, loaded with a special liquid liquid to deliver the heat from the evaporator zone to the other end called condenser zone, but because the heat pipe condenser output temperature is still high therefore a cascade heat pipe was created to lower the output temperature. In this study there are four CPU cooling systems used namely single condenser cascade heat pipe and a double condenser cascade heat pipe, while others two cooling systems as a comparison namely non-cascade heat pipe and non-cascade heat pipe with fan. This study aims to find out the cooling performance of cascade heat pipe as CPU cooling system in a small form factor de...
International Journal of Technology
Computer Central Processing Unit (CPU) technology is being developed rapidly for better work perf... more Computer Central Processing Unit (CPU) technology is being developed rapidly for better work performance together with smaller size. This technology development produces significant heat flux increase on the processor. In this paper, a cascade straight heat pipe (CSHP) is created for a better CPU cooling system which is a fully passive system using nanofluids and hybrid nanofluid as the working fluid. Heat loads were given to the CSHP at 10 watts, 20 watts, 30 watts, and 40 watts, respectively. Based on the experiment's result, the CSHP with Al2O3-TiO2-water working fluid showed the best performance, decreasing 41.872% of the simulator plate temperature at maximum load while also having the highest condenser output temperature. The CSHP with Al2O3-water working fluid decreased 35.243% of the simulator plate temperature. The CSHP with water working fluid decreased only 28.648% of the simulator plate temperature and had the lowest condenser output temperature. The CSHP with Al2O3-TiO2-water showed the lowest thermal resistance and the highest coefficient of heat transfer.
E3S Web of Conferences
A novel design of a thermal management pavement system is introduced in this paper. The basic con... more A novel design of a thermal management pavement system is introduced in this paper. The basic concept behind this design is a utilize of waste heat from asphalt pavement have as a base a heat pipe and thermoelectric for energy of street lighting. In this system, output voltage is influenced by difference in temperature between hot side and cold side of thermoelectric. The intensity of solar radiation at hourly is variant, so the resulting of output voltage fluctuated. The research method by field testing direct exposed solar radiation on the variation time at 09.00; 10.00; 11.00; 12.00; 13.00; 14.00; 15.00; 16.00 Indonesia Central Standard Time. The data of this research are surface temperature of asphalt pavement, difference in temperature between hot side and cold side of thermoelectric, and output voltage of system. The analysis process by quantitative experimental. In this research, the output voltage increased from 09.00 until 13.00, and after that time the output voltage decre...
Jurnal Teknik Industri
The energy used as a dryer is usually only a single type of energy. In this case, study is conduc... more The energy used as a dryer is usually only a single type of energy. In this case, study is conducted on the natural flowdryer system by using the chimney. This combination of energy utilization of solar energy and biomass that can be used simultaneously or one turns in accordance with the needs or circumstances. It has been tested against a dryer prototype by performing measurements on the temperature of the inlet air and exit on biomass furnace, the temperature of the inlet air and exit on the solar collector, the temperature of inlet air and exit on the drying chamber, the water content of dried material, the temperature of dried material, the surface temperature of inside and outside of wall on drying chamber, and the intensity of solar radiation. Data were collected at an interval of 30 minutes and do the processing of such data. Next made in a graphical form of thermal energy balance and system efficiency versus the time. Results obtained that: the drying time was 7.5 hours. Th...
Applied Mechanics and Materials
In developing countries, the sun and biomass are very important as the alternative and renewable ... more In developing countries, the sun and biomass are very important as the alternative and renewable energy sources that is very necessary the effort for utilizing them maximally. This study has developed a natural hybrid dryer system utilizing the heat energy was generated from the biomass stove and the solar collector. This dryer system has been tested on the chimney height variation of exhaust moist air, namely: 2m, 4m, and 6m. For assessment of thermal efficiency, several variables of experimental data was collected consist of: several point of air flow temperatures, the ambient temperature, air flow velocities, mass of material which was dried, and solar radiation. Further, the efficiency of solar collector, the efficiency of biomass stove, the efficiency of drying chamber, and the total efficiency of system against the time as the purpose of this study. The result showed that with increased of chimney height of exhaust moist air caused the increase of air mass flow rate, and furth...
Jurnal Energi Dan Manufaktur, 2010
Jurnal Energi Dan Manufaktur, 2010
... 5.hal 50-57 [4] Icropera, Frank P. And De Witt, David P, (2008), Fundamentals of Heat and Mas... more ... 5.hal 50-57 [4] Icropera, Frank P. And De Witt, David P, (2008), Fundamentals of Heat and Mass Transfer, John Wiley & Sons, Sixth Edition. [5] Puji Widodo dan AgungHendriadi, (2004), Perbandingan Kinerja Mesin Pengering ...
Jurnal Energi Dan Manufaktur, 2009
IOP Conference Series: Materials Science and Engineering, 2019
Smart technologies are the scientific knowledge application that develops into computer technolog... more Smart technologies are the scientific knowledge application that develops into computer technology. Central Processing Unit (CPU) is a computer hardware that carries out the computer program instructions. The CPU technology development is very fast with the impression of smaller dimensions yet maintain its performance and efficiency, this results in a heat flux or overheating that should be reduced and even removed from the CPU system to maintain the CPU performance and life because the overheating could potentially damage and slow down the computer work. To solve the CPU heat flux problem, we use heat pipes as the cooling system, because of its ability to transfer heat and contribute to the high outlet temperature in the condenser. The cascade heat pipe design is made by combining two heat pipes into one. The design is expected to be able to reduce the processor temperature by 2.74°C at the idle condition, 1.48°C at maximum conditions, and condenser section by 14.94°C at the idle c...
IOP Conference Series: Materials Science and Engineering, 2019
The development of electronic device is moving toward Smart Technologies, But, the idea of Smart ... more The development of electronic device is moving toward Smart Technologies, But, the idea of Smart Technologies brings a new problem to heat flux management because the device produces more heat to be banished, especially CPU. So to solve those problems, heat pipe was chosen to be an alternative solution. Heat pipe was hoped to be a passive cooling system technology, but further research shows that goal can’t be achieved, due to the high condenser temperature, and the cooling system still needs fan support to banish the heat quickly from the device. So, this paper will discuss a research about new cascade system for heat pipe with variations of heat load and amount of condenser. The results were compared to non-cascade heat pipe to know its thermal performance, especially in thermal resistance. The results show that application of cascade straight heat pipe is effective to solve high condenser temperature problem. In thermal resistance, non-cascade heat pipe still better, but the diff...
Jurnal Energi Dan Manufaktur, 2012
In a drying process usually used forced flow condition. The energy used a dryer is usually only a... more In a drying process usually used forced flow condition. The energy used a dryer is usually only a single type of energy. Thus,the study is conducted on the natural flow dryer system by using the chimney. The energy used as a dryer is solar energy andbiomass that can be used simultaneously or one turns in accordance with the needs and circumstances. Has done testing of aprototype natural flow dryers utilize a combination of solar collectors energy and biomass furnace. Testing is done threetimes a process by measuring the following: the inlet air temperature of the biomass furnace, the outlet air temperature of thebiomass furnace, the inlet air temperature of the solar collector, the outlet air temperature of the solar collector, airtemperature into the drying chamber, air temperature out of the drying chamber, the mass decreasing of dried material, andthe intensity of solar radiation. Data were collected at each interval of 30 minutes was followed by processing of these datato obtain...
Jurnal Energi Dan Manufaktur, 2009
Radiator is one of heat exchanger applications that has a function to remove out of heat must be ... more Radiator is one of heat exchanger applications that has a function to remove out of heat must be able to operate properly for allowed engine temperature limit. Vehicles that operate on the street usually driving with varying rpm so that the heat produced by the combustion process is not constant and then this study analyze the performance of radiators as a function of time (transient condition). Tests is done on the condition of operating the engine with five rpm variations, each for one hour with air conditioning load and without air-conditioning load. The data to be collected includ the inlet and outlet temperature of radiator and radiator fluid volume flow. The results obtained is heat exhausted rate as a performance radiator is increasing as with increasing of engine rpm and at load conditions with the AC produces heat exhausted rate is greater than AC without AC load. The heat exhausted rate in an hour of machine operation still shows the system operates at a transient conditio...
International Journal of Technology, 2020
Jurnal Energi Dan Manufaktur, 2008
Mobil yang digunakan untuk menempuh perjalanan yang jauh biasanya dipacu dengan kecepatan yang cu... more Mobil yang digunakan untuk menempuh perjalanan yang jauh biasanya dipacu dengan kecepatan yang cukup tinggi dengan putaran mesin berkisar pada rpm 2000 dan dalam jangka waktu yang cukup lama. Agar tidak terjadi hal-hal yang tidak diinginkan akibat suhu mesin melebihi suhu normal mesin saat bekerja, maka penelitian ini perlu dilakukan. Pada penelitian ini dilakukan pengujian perbandingan laju pembuangan panas mesin antara pemakaian 100% air dengan campuran 80% air dan 20% radiator coolant dengan metode paired comparison pada rpm 2000. Dari penelitian tersebut diambil data antara lain temperatur masuk dan keluar radiator, dan volume aliran fluida radiator (Q) yang kemudian dilakukan pengolahan data untuk menentukan laju aliran massa (m), panas spesifik fluida (Cp), laju pembuangan panas radiator (q), dan pengolahan data secara statistik. Hasil pengujian terhadap campuran fluida radiator 80% air dan 20% radiator coolant menunjukkan rata – rata selisih temperatur inlet radiator dengan t...
There have been many studies about the dryer with a static bed so dry material produced is not un... more There have been many studies about the dryer with a static bed so dry material produced is not uniform. Thus, drying withrotating bed can produce the dry material uniformly. Usually a prototype closest to the efficiency of the system as aperformance, but it has not been able to show its thermal energy balance. So the target of this research is a transient thermalenergy balance. Data taken in the testing include: the temperature inlet fluid of drying chamber channel (Tin), the velocity offluid flow into drying chamber channel (V), the outlet fluid temperature from drying chamber channel (Tout), the temperatureof dried material (Tmtl), the mass of dried material (mmtl), the surface temperature in the drying chamber wall (Tdlm), surfacetemperature out the drying chamber wall (Tluar). Next step is to get the results of data processing in the form of transientthermal energy balance in tables and graphs. From the results it can be seen that the useful energy decreases with timealthough th...
Efficiency of sea-water Distillator is a ratio between evaporation-condensation to the solar inte... more Efficiency of sea-water Distillator is a ratio between evaporation-condensation to the solar intensity. When the solar intensity decreases dramatically, the decrease of evaporation-condensation speed is moderate. This occurs because of the exist of collected energy at the basin that can be vaporized the sea-water, so then the analysis here is transient analysis, and the steady state analysis can not be applied. Design and prototype of sea-water distillator by using solar energy are developed. Investigation is conducted to obtain the performance of the prototype within 3-process experiments. Data are collected and calculations are conducted, and results are performed in the table. The results of calculation are arranged on the graphs. Then, the analysis are performed based on the grapsh. Design of prototype is with area of basin surface of (1 x 1) m 2 . From the experiments, it can be concluded that the prototype runs well. The water product from the prototype has been checked and re...
In a drying process usually used forced flow condition. The energy used a dryer is usually only a... more In a drying process usually used forced flow condition. The energy used a dryer is usually only a single type of energy. Thus,the study is conducted on the natural flow dryer system by using the chimney. The energy used as a dryer is solar energy andbiomass that can be used simultaneously or one turns in accordance with the needs and circumstances. Has done testing of aprototype natural flow dryers utilize a combination of solar collectors energy and biomass furnace. Testing is done threetimes a process by measuring the following: the inlet air temperature of the biomass furnace, the outlet air temperature of thebiomass furnace, the inlet air temperature of the solar collector, the outlet air temperature of the solar collector, airtemperature into the drying chamber, air temperature out of the drying chamber, the mass decreasing of dried material, andthe intensity of solar radiation. Data were collected at each interval of 30 minutes was followed by processing of these datato obtain...
Biasanya dalam proses pengeringan, pelat logam tipis dilapisi waraa hitam digunakan sebagai penye... more Biasanya dalam proses pengeringan, pelat logam tipis dilapisi waraa hitam digunakan sebagai penyerap radiasi matahari. Pelat logam harganya mahal, sehingga penggunaaniiya tidak memungkinkan bagi masyarakat pedesaan yang mempunyai penghasilan rendah untuk mengeringkan hasil panennya seperti : padi, jagung, kacang dan Iain-lain. Temperatur udara untuk proses pengeringan umumnya tidak terlalu tinggi kira-kira 45AâA°C - 55AâA°C. Mengingat kebutuhan tersebut maka memungkinkan penggunaan batu krikil yang dicat hitam sebagai pengganti pelat logam. Telah didesain dan dibuat sebuah prototipe alat pengering tenaga surya dengan menggunakan batu krikil sebagai kolektor. Dimensi kolektor adalah lebar 0,9 m dan panjang 1,4 m. Alat ini digunakan untuk kapasitas pengeringan gabah 25 kg. Karena massa kolektor terbuat dari krikil, relatif besar terhadap massa pelat logam,maka metode unsteadi-state digunakan dalam perhitungan performansi pengeringan tenaga surya. Dari percobaan didapat efisi...
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Computer will overheat quickly if used in a state of full load continuously. One component on a c... more Computer will overheat quickly if used in a state of full load continuously. One component on a computer that generates heat is the central processing unit (CPU) which is a key component on a computer where program instructions are processed. One of the right solutions to cool the CPU is the use of heat pipes as cooling system, using several size container, loaded with a special liquid liquid to deliver the heat from the evaporator zone to the other end called condenser zone, but because the heat pipe condenser output temperature is still high therefore a cascade heat pipe was created to lower the output temperature. In this study there are four CPU cooling systems used namely single condenser cascade heat pipe and a double condenser cascade heat pipe, while others two cooling systems as a comparison namely non-cascade heat pipe and non-cascade heat pipe with fan. This study aims to find out the cooling performance of cascade heat pipe as CPU cooling system in a small form factor de...
International Journal of Technology
Computer Central Processing Unit (CPU) technology is being developed rapidly for better work perf... more Computer Central Processing Unit (CPU) technology is being developed rapidly for better work performance together with smaller size. This technology development produces significant heat flux increase on the processor. In this paper, a cascade straight heat pipe (CSHP) is created for a better CPU cooling system which is a fully passive system using nanofluids and hybrid nanofluid as the working fluid. Heat loads were given to the CSHP at 10 watts, 20 watts, 30 watts, and 40 watts, respectively. Based on the experiment's result, the CSHP with Al2O3-TiO2-water working fluid showed the best performance, decreasing 41.872% of the simulator plate temperature at maximum load while also having the highest condenser output temperature. The CSHP with Al2O3-water working fluid decreased 35.243% of the simulator plate temperature. The CSHP with water working fluid decreased only 28.648% of the simulator plate temperature and had the lowest condenser output temperature. The CSHP with Al2O3-TiO2-water showed the lowest thermal resistance and the highest coefficient of heat transfer.
E3S Web of Conferences
A novel design of a thermal management pavement system is introduced in this paper. The basic con... more A novel design of a thermal management pavement system is introduced in this paper. The basic concept behind this design is a utilize of waste heat from asphalt pavement have as a base a heat pipe and thermoelectric for energy of street lighting. In this system, output voltage is influenced by difference in temperature between hot side and cold side of thermoelectric. The intensity of solar radiation at hourly is variant, so the resulting of output voltage fluctuated. The research method by field testing direct exposed solar radiation on the variation time at 09.00; 10.00; 11.00; 12.00; 13.00; 14.00; 15.00; 16.00 Indonesia Central Standard Time. The data of this research are surface temperature of asphalt pavement, difference in temperature between hot side and cold side of thermoelectric, and output voltage of system. The analysis process by quantitative experimental. In this research, the output voltage increased from 09.00 until 13.00, and after that time the output voltage decre...
Jurnal Teknik Industri
The energy used as a dryer is usually only a single type of energy. In this case, study is conduc... more The energy used as a dryer is usually only a single type of energy. In this case, study is conducted on the natural flowdryer system by using the chimney. This combination of energy utilization of solar energy and biomass that can be used simultaneously or one turns in accordance with the needs or circumstances. It has been tested against a dryer prototype by performing measurements on the temperature of the inlet air and exit on biomass furnace, the temperature of the inlet air and exit on the solar collector, the temperature of inlet air and exit on the drying chamber, the water content of dried material, the temperature of dried material, the surface temperature of inside and outside of wall on drying chamber, and the intensity of solar radiation. Data were collected at an interval of 30 minutes and do the processing of such data. Next made in a graphical form of thermal energy balance and system efficiency versus the time. Results obtained that: the drying time was 7.5 hours. Th...
Applied Mechanics and Materials
In developing countries, the sun and biomass are very important as the alternative and renewable ... more In developing countries, the sun and biomass are very important as the alternative and renewable energy sources that is very necessary the effort for utilizing them maximally. This study has developed a natural hybrid dryer system utilizing the heat energy was generated from the biomass stove and the solar collector. This dryer system has been tested on the chimney height variation of exhaust moist air, namely: 2m, 4m, and 6m. For assessment of thermal efficiency, several variables of experimental data was collected consist of: several point of air flow temperatures, the ambient temperature, air flow velocities, mass of material which was dried, and solar radiation. Further, the efficiency of solar collector, the efficiency of biomass stove, the efficiency of drying chamber, and the total efficiency of system against the time as the purpose of this study. The result showed that with increased of chimney height of exhaust moist air caused the increase of air mass flow rate, and furth...
Jurnal Energi Dan Manufaktur, 2010
Jurnal Energi Dan Manufaktur, 2010
... 5.hal 50-57 [4] Icropera, Frank P. And De Witt, David P, (2008), Fundamentals of Heat and Mas... more ... 5.hal 50-57 [4] Icropera, Frank P. And De Witt, David P, (2008), Fundamentals of Heat and Mass Transfer, John Wiley & Sons, Sixth Edition. [5] Puji Widodo dan AgungHendriadi, (2004), Perbandingan Kinerja Mesin Pengering ...
Jurnal Energi Dan Manufaktur, 2009