Henry Nasution | Swiss Germany University (original) (raw)

Papers by Henry Nasution

This paper describes a tuning for PID controller based on a trial and error method. The algorithm... more This paper describes a tuning for PID controller based on a trial and error method. The algorithm is applied to a computer based single-input single-output (SISO) on air conditioning (AC). Some experiments are conducted to observe the ability of the controller in the temperature control of SISO AC under set-point changes. The controller gains to obtain a good response of the room temperature and optimum energy consumption for the system studied were found to be 3.3, 0.180 and 0.040 for the proportional, integral and derivative terms, respectively. The experimental results prove that the controller is capable of giving a good control result for the process.

Proceedings of the 3rd International Conference on Business and Management of Technology (ICONBMT 2021)

Komatsu PC 200-8 hydraulic excavator is one of the most popular heavy equipment machine models, w... more Komatsu PC 200-8 hydraulic excavator is one of the most popular heavy equipment machine models, widely used in general sectors: construction, agriculture, and plantation. This excavator is equipped with electrical system, hydraulic system, and mechatronic system. All actuator movement in this excavator are controlled by mechatronic system. High skilled mechanics are needed to maintain the mechatronic system in this excavator. Good training method is needed to produce a skillful mechanic. The training method is conducted by theoretical introduction of the mechatronic system and followed by practice in laboratories, workshops, as well as in the field. In this project, mechatronic system simulator for Komatsu hydraulic excavator is developed to simulate auto warming up and overheat prevention system for the training purpose. The simulator has been tested in training and based on interviews with trainees, the simulator can help the learning process in the training and improve trainee kn...

The use of hydrocarbon gases as a refrigerant has been done before the emergence of CFCs (chlorof... more The use of hydrocarbon gases as a refrigerant has been done before the emergence of CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). However, because of issues of environmental damage caused by both the gas, namely CFCs and HCFCs, causing the experts try to use environmentally friendly refrigerants, namely hydrocarbons. The hydrocarbon used in this study was a mixture of propane (R290), butane (R600), and isobutane (R600a), and was called HC-22. The air-conditioning was originally to work with refrigerant HCFC-22 and with compressor capacity is 1860 W. Measurements were taken during the experimental period at a time interval of ten minutes for a set point temperature of 20oC. The objective of the research was to compare the refrigeration performance of different refrigerants in terms of a coefficient of performance (COP), refrigeration effect, and power consumption by the compressor. The experimental results showed that the COP, cooling capacity and energy saving of ...

This paper presents a literature review of in-cabin ventilation for park vehicle. Various ways to... more This paper presents a literature review of in-cabin ventilation for park vehicle. Various ways to decrease peak temperature inside vehicle cabin is presented. The present study can also provide an idea to the best possible solution for cooling load reduction to improve fuel economy and increase thermal comfort for passengers.

The present study both the motive nozzle and device, based on the cooling capacity of as refriger... more The present study both the motive nozzle and device, based on the cooling capacity of as refrigerant. Previous studies HC290 (propane) in the air conditioner performance (COP). The purpose of replacing as an expansion device i n improve the COP. In developing the model, conservat ion laws of mass, momentum and energy equations were applied to each p rt of the ejector. The numerical results show that the mm) under varying condenser temperature constant-area decreases as that improvement of the COP can reach 32.90% at °C. From the results mentioned ejector can further improve the COP of a split as working fluid.

Aircraft maintenance is using very large hangar as a place to work on the aircrafts and the hanga... more Aircraft maintenance is using very large hangar as a place to work on the aircrafts and the hangar can fit several aircrafts at the same time. The aircrafts are moved using tow cars in and out of the hangar. The hangar is so big that it requires columns for its structure and these columns present risk to the aircrafts for having wingtip collitions during towing in and out of the hangar. In this study, warning system for aircraft wingtip proximity to the hangar columns is designed. This warning system is using ultrasonic sensors attached to the columns and controlled by Arduino micro processor and wirelessly connected as Internet of Things system to warn the driver of the tow car. The ultrasonic sensors are placed in the columns based on dimension and elevation of 2 different most common aircraft wingtips to get effective column warning system. The speed of tow car affects the driver time to response the warning and based on calculations and experiments, the tow car driver should hav...

Gas Engine Generator (GEG) Power plants as electricity producers need to be maintained using moni... more Gas Engine Generator (GEG) Power plants as electricity producers need to be maintained using monitoring performance and continuously improvements. Company management of power plant is difficult to make decision for continuous improvement, requires Performance Measurement Tools (PMT) to determine the performance of a GEG power plant. PMT developed using Key Performance Indicator (KPI) that was defined through Forum Group Discussion (FGD) with different field of expertise in company and based on references and the weighting of KPI criterion that was developed by Analytic Hierarchy Process (AHP). This study was a case study at leading medium energy company in Indonesia. PMT is a tool to calculate Performance Score (PS) from the calculation of actual data, contracts and KPI (Power Output/PO, Heat Rate/HR, Operation Ratio/OR, Capacity Factor/CF) weights. If there is a gap in the PS then it can indicate penalty from customer especially PO and HR. Case study was conducted on three power pl...

Komatsu PC200-8M0 excavators operate mostly in the mining and forestry sector that covers a very ... more Komatsu PC200-8M0 excavators operate mostly in the mining and forestry sector that covers a very large land area up to thousands hectares. Operation of this excavator requires a fuel tank for refueling process. In many cases, there were fuel thefts from the fuel tank of this excavator because the excavator were located in remote area. To overcome this problem, it is necessary to develop a fuel monitoring tool that can monitor and send warnings to the excavator owner if there is any fuel access into the excavator fuel tank during the rest time of the excavator. The monitoring tool is developed by using a NODEMCU ESP8266 microcontroller that connected to the internet network so that it will be able to communicate with the Thingspeak webserver. With internet access, the monitoring process can be carried out by using a computer and also smart mobile phone.

Heavy equipment uses diesel engines as the main power source. Common problem in diesel engines is... more Heavy equipment uses diesel engines as the main power source. Common problem in diesel engines is engine overheat condition and the cause of this problem can come from thermostat failure. Diagnosis of the thermostat when problem occurs in the diesel engine cooling system requires a long time. This study aims to determine the condition of the coolant flow and monitor thermostat performance while engine is running so thermostat failure can be detected earlier. In this study, an ultrasonic flow meter to measure coolant flow rate in the diesel engine cooling system was developed and the measurement is displayed for monitoring the condition of thermostat. The monitoring system has been installed and the results showed significant relationship between the coolant flow rate and the performance of the thermostat. This monitoring system can show that when the thermostat is in normal condition and when the coolant temperature reaches 80oC, it is detected that the coolant flow rate from the en...

In this study, an alternative solution to reduce energy consumption in building airconditioning s... more In this study, an alternative solution to reduce energy consumption in building airconditioning system is proposed and introduced. The operation and energy consumption of the system operated as either with the new control system or with the traditional on/off control were compared. Measurements were taken during the experimental period at a time interval of one minute for a set point temperature of 22 and 23o C. The room temperature, energy consumption and energy-saving ware analyzed. The main objective is to determine the amount of energy saved when a digital on/off and fuzzy logic controller is applied to the air-conditioning system. The experimental results show that significant energy savings of approximately 24 to 43% for digital on/off and 48 to 73% for fuzzy logic control were obtained. The results also indicated that the digital on/off and fuzzy logic control can save energy and improve indoor comfort significantly for building AC system compared to the thermostat control te...

Control valve is one of key elements in processing of a chemical industry and it is one of its im... more Control valve is one of key elements in processing of a chemical industry and it is one of its important functions is as a flow control of chemical process. The accuracy of control valve opening or traveling is proportional to flow capacity. On the other hand, a leakage of a control valve on its failed position especially for Air to Open-Fail Closed (ATO-FC) type valve can become a disaster. One of critical parameters in Control Valve that impacts to performance and fail-safe position is Bench set range spring in valve’s actuator. This work analyzed this Bench set range impact to the fail-safe position. The force in spring is defined by control valve specification verified by force balance method of control valve. Then the impact of bench set range was analyzed by displacement of spring from spring force equation. At the end, the outcome is displacement data in correlation to the change of bench set range. It helps the repair technician on the maintenance workshop of permissible ran...

In-cabin temperature control and multi-circuit bus air-conditioning systems were developed. The s... more In-cabin temperature control and multi-circuit bus air-conditioning systems were developed. The system work dependent on the cooling load either one or more circuits will automatically be switched on. One circuit of the system can have been varying speed in order to fine-tune the cooling response time as the cooling load varies inside bus cabin. Variable-speed compressor provides potential on the load-matching capability, energy saving and thermal comfort of the passengers inside bus cabin. The experiments were conducted on a test rig with temperature setting of 22°C for the conditioned space to evaluate the energy usage of the system with thermostat and fuzzy logic (FLC) controllers. The results indicate that the proposed technique can save energy and improve indoor comfort significantly for multi-circuit bus air-conditioning systems compared to the existing system. The experimental results also showed that more energy savings can be obtained through the use of FLC when compared to...

Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tin... more Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tingkat dengan menggunakan berbagai bahan penyimpan panas (aluminium, stainless steel dan seng), alat uji destilasi surya ini dapat berproduksi terus menerus selama 24 jam. luas kolektor bagian bawah 0,65 m2, bagian tengah 0,4 m2 dan bagian atas 0,4 m2.Prinsip kerja alat yaitu radiasi matahari dirubah menjadi energi panas pada kolektor, panas akan terkumpul di dalam plat penyerap dan memanaskan air laut yang berada pada setiap basin. Untuk meningkatkan produktivitas air bersih, diletakkan bahan penyimpan panas pada basin bagian bawah. Hasil pengujian menunjukkan pemakaian stainlees steel sebagai penyimpan panas dapat menghasilkan produktivitas air bersih lebih tinggi dibandingkan dengan bahan penyimpan panas dari seng dan aluminium.

Energy audit is one of the effective tools to identify potential of energy conservation and help ... more Energy audit is one of the effective tools to identify potential of energy conservation and help to identifyenergy waste in a facility or system. In commercial office building like the Faculty of MechanicalEngineering (FME) Academic Building, its air-conditioning system (AC) alone consumed almost 72.55% oftotal monthly FME energy consumption for both of its Split unit and Central Cooling System. The objectiveof this study is to find the energy usage and billing of the AC at FME Academic building and finally torecommend the possible methods for energy conservation related to the system. This energy audit is done byconducting system observation, acquire data and information such as maintenance record, electrical usage,room condition and analyse system performance. During data collecting and observation few cause werefound that lead to excess energy consumption for both systems that can be conserver in monetary term. Forexample, the VRV system that currently installed is expected to gi...

Vapor compression refrigeration cycle (VCRC) is widely used in freezers. In a simple cycle of the... more Vapor compression refrigeration cycle (VCRC) is widely used in freezers. In a simple cycle of the VCRC, refrigerant in the condenser exit is at liquid saturated line. If the refrigerant temperature in the condenser exit is further cooled to the subcooled region results in an increase in the cooling capacity due to low vapor quality of refrigerant entering the evaporator. The lower the refrigerant quality entering the evaporator, the higher the cooling capacity on the evaporator. The increase in the cooling capacity enhances the freezer performance. Subcooling uses liquid suction heat exchanger (LSHX) is applied to transfer heat from the exit of the condenser (liquid line) to the suction of the compressor. Because the temperature of liquid line is higher than that of the suction line, heat flows from liquid line to the suction line, results in the decrease in temperature of the exit of the condenser and the increase in the suction temperature (superheating). Consequently, the use of ...

Proceedings of The Conference on Management and Engineering in Industry

Power plants as electricity producers need to be maintained using monitoring performance and cont... more Power plants as electricity producers need to be maintained using monitoring performance and continuous improvements. Company management of power plant is difficult to make a decision for the continuous improvement, requires Performance Measurement Tools (PMT) to determine the performance of a gas engine power plant. PMT developed using Key Performance Indicator (KPI) that was defined through Forum Group Discussion (FGD) with different field of expertise in company and based on references and the weighting of KPI criterion that was developed by Analytic Hierarchy Process (AHP). This study has developed the weight of KPI that the weight of each criterion which will be used as a reference is Rank 1 – Power Output (MW) – PO (70.81%), Rank 2 – Heat Rate (Btu/kWh) – HR (14.91%), Operating Ratio (%) – OR (8.06%) and Rank 4 – Capacity Factor (%) – CF (6.22%).

Proceedings of The Conference on Management and Engineering in Industry

The availability and readiness of heavy equipment depends on the level of product support. Produc... more The availability and readiness of heavy equipment depends on the level of product support. Product support as after sales service is important for customers to ensure that heavy equipment purchased is always ready for use and produces optimal production. Leadtime and mechanic speed in solving problems that occur in equipment and the so called On Time in Full Solution (OTIF Solution) affects the usability and productivity of equipment. Performance OTIF Solution affects Product Support Performance, and this affects the level of customer satisfaction. The development of mechanic competencies through competency-based training and problems in the field with reference to the Special Work Competency Standards is a strategy to increase the ability and speed of mechanics to solve problems that occur in machines in order to get good OTIF Solution performance. This research aims to determine the impact of increasing competence. mechanic through training with a competency-based curriculum on pr...

Proceedings of The Conference on Management and Engineering in Industry

The government continues to encourage efforts to increase renewable energy, one of which is by is... more The government continues to encourage efforts to increase renewable energy, one of which is by issuing a ministerial regulation of energy and mineral resources (MEMR) 49/2018 with amendments no. 13/2019 and 16/2019. The key points of this policy are reducing the constant in charge capacity for industry, simplifying the licensing process and the existence of operating permits and certificates of operation feasibility, as well as compensation for export credit of 65% which is still deemed unfavorable. As of October 2020, 2,566 solar PV rooftop customers have registered, with a total capacity of 18.19 MWp. This research aims to not only analyze the gap policy, but also to make a case study in a Leading Heavy Equipment Company in Indonesia building on the existing PV rootop policy. By using a web-based simulation that is Helio Scope and the calculation of investment feasibility, the results are not economically profitable. This is due to the high investment value, interest rate value, a...

This paper describes a tuning for PID controller based on a trial and error method. The algorithm... more This paper describes a tuning for PID controller based on a trial and error method. The algorithm is applied to a computer based single-input single-output (SISO) on air conditioning (AC). Some experiments are conducted to observe the ability of the controller in the temperature control of SISO AC under set-point changes. The controller gains to obtain a good response of the room temperature and optimum energy consumption for the system studied were found to be 3.3, 0.180 and 0.040 for the proportional, integral and derivative terms, respectively. The experimental results prove that the controller is capable of giving a good control result for the process.

Proceedings of the 3rd International Conference on Business and Management of Technology (ICONBMT 2021)

Komatsu PC 200-8 hydraulic excavator is one of the most popular heavy equipment machine models, w... more Komatsu PC 200-8 hydraulic excavator is one of the most popular heavy equipment machine models, widely used in general sectors: construction, agriculture, and plantation. This excavator is equipped with electrical system, hydraulic system, and mechatronic system. All actuator movement in this excavator are controlled by mechatronic system. High skilled mechanics are needed to maintain the mechatronic system in this excavator. Good training method is needed to produce a skillful mechanic. The training method is conducted by theoretical introduction of the mechatronic system and followed by practice in laboratories, workshops, as well as in the field. In this project, mechatronic system simulator for Komatsu hydraulic excavator is developed to simulate auto warming up and overheat prevention system for the training purpose. The simulator has been tested in training and based on interviews with trainees, the simulator can help the learning process in the training and improve trainee kn...

The use of hydrocarbon gases as a refrigerant has been done before the emergence of CFCs (chlorof... more The use of hydrocarbon gases as a refrigerant has been done before the emergence of CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). However, because of issues of environmental damage caused by both the gas, namely CFCs and HCFCs, causing the experts try to use environmentally friendly refrigerants, namely hydrocarbons. The hydrocarbon used in this study was a mixture of propane (R290), butane (R600), and isobutane (R600a), and was called HC-22. The air-conditioning was originally to work with refrigerant HCFC-22 and with compressor capacity is 1860 W. Measurements were taken during the experimental period at a time interval of ten minutes for a set point temperature of 20oC. The objective of the research was to compare the refrigeration performance of different refrigerants in terms of a coefficient of performance (COP), refrigeration effect, and power consumption by the compressor. The experimental results showed that the COP, cooling capacity and energy saving of ...

This paper presents a literature review of in-cabin ventilation for park vehicle. Various ways to... more This paper presents a literature review of in-cabin ventilation for park vehicle. Various ways to decrease peak temperature inside vehicle cabin is presented. The present study can also provide an idea to the best possible solution for cooling load reduction to improve fuel economy and increase thermal comfort for passengers.

The present study both the motive nozzle and device, based on the cooling capacity of as refriger... more The present study both the motive nozzle and device, based on the cooling capacity of as refrigerant. Previous studies HC290 (propane) in the air conditioner performance (COP). The purpose of replacing as an expansion device i n improve the COP. In developing the model, conservat ion laws of mass, momentum and energy equations were applied to each p rt of the ejector. The numerical results show that the mm) under varying condenser temperature constant-area decreases as that improvement of the COP can reach 32.90% at °C. From the results mentioned ejector can further improve the COP of a split as working fluid.

Aircraft maintenance is using very large hangar as a place to work on the aircrafts and the hanga... more Aircraft maintenance is using very large hangar as a place to work on the aircrafts and the hangar can fit several aircrafts at the same time. The aircrafts are moved using tow cars in and out of the hangar. The hangar is so big that it requires columns for its structure and these columns present risk to the aircrafts for having wingtip collitions during towing in and out of the hangar. In this study, warning system for aircraft wingtip proximity to the hangar columns is designed. This warning system is using ultrasonic sensors attached to the columns and controlled by Arduino micro processor and wirelessly connected as Internet of Things system to warn the driver of the tow car. The ultrasonic sensors are placed in the columns based on dimension and elevation of 2 different most common aircraft wingtips to get effective column warning system. The speed of tow car affects the driver time to response the warning and based on calculations and experiments, the tow car driver should hav...

Gas Engine Generator (GEG) Power plants as electricity producers need to be maintained using moni... more Gas Engine Generator (GEG) Power plants as electricity producers need to be maintained using monitoring performance and continuously improvements. Company management of power plant is difficult to make decision for continuous improvement, requires Performance Measurement Tools (PMT) to determine the performance of a GEG power plant. PMT developed using Key Performance Indicator (KPI) that was defined through Forum Group Discussion (FGD) with different field of expertise in company and based on references and the weighting of KPI criterion that was developed by Analytic Hierarchy Process (AHP). This study was a case study at leading medium energy company in Indonesia. PMT is a tool to calculate Performance Score (PS) from the calculation of actual data, contracts and KPI (Power Output/PO, Heat Rate/HR, Operation Ratio/OR, Capacity Factor/CF) weights. If there is a gap in the PS then it can indicate penalty from customer especially PO and HR. Case study was conducted on three power pl...

Komatsu PC200-8M0 excavators operate mostly in the mining and forestry sector that covers a very ... more Komatsu PC200-8M0 excavators operate mostly in the mining and forestry sector that covers a very large land area up to thousands hectares. Operation of this excavator requires a fuel tank for refueling process. In many cases, there were fuel thefts from the fuel tank of this excavator because the excavator were located in remote area. To overcome this problem, it is necessary to develop a fuel monitoring tool that can monitor and send warnings to the excavator owner if there is any fuel access into the excavator fuel tank during the rest time of the excavator. The monitoring tool is developed by using a NODEMCU ESP8266 microcontroller that connected to the internet network so that it will be able to communicate with the Thingspeak webserver. With internet access, the monitoring process can be carried out by using a computer and also smart mobile phone.

Heavy equipment uses diesel engines as the main power source. Common problem in diesel engines is... more Heavy equipment uses diesel engines as the main power source. Common problem in diesel engines is engine overheat condition and the cause of this problem can come from thermostat failure. Diagnosis of the thermostat when problem occurs in the diesel engine cooling system requires a long time. This study aims to determine the condition of the coolant flow and monitor thermostat performance while engine is running so thermostat failure can be detected earlier. In this study, an ultrasonic flow meter to measure coolant flow rate in the diesel engine cooling system was developed and the measurement is displayed for monitoring the condition of thermostat. The monitoring system has been installed and the results showed significant relationship between the coolant flow rate and the performance of the thermostat. This monitoring system can show that when the thermostat is in normal condition and when the coolant temperature reaches 80oC, it is detected that the coolant flow rate from the en...

In this study, an alternative solution to reduce energy consumption in building airconditioning s... more In this study, an alternative solution to reduce energy consumption in building airconditioning system is proposed and introduced. The operation and energy consumption of the system operated as either with the new control system or with the traditional on/off control were compared. Measurements were taken during the experimental period at a time interval of one minute for a set point temperature of 22 and 23o C. The room temperature, energy consumption and energy-saving ware analyzed. The main objective is to determine the amount of energy saved when a digital on/off and fuzzy logic controller is applied to the air-conditioning system. The experimental results show that significant energy savings of approximately 24 to 43% for digital on/off and 48 to 73% for fuzzy logic control were obtained. The results also indicated that the digital on/off and fuzzy logic control can save energy and improve indoor comfort significantly for building AC system compared to the thermostat control te...

Control valve is one of key elements in processing of a chemical industry and it is one of its im... more Control valve is one of key elements in processing of a chemical industry and it is one of its important functions is as a flow control of chemical process. The accuracy of control valve opening or traveling is proportional to flow capacity. On the other hand, a leakage of a control valve on its failed position especially for Air to Open-Fail Closed (ATO-FC) type valve can become a disaster. One of critical parameters in Control Valve that impacts to performance and fail-safe position is Bench set range spring in valve’s actuator. This work analyzed this Bench set range impact to the fail-safe position. The force in spring is defined by control valve specification verified by force balance method of control valve. Then the impact of bench set range was analyzed by displacement of spring from spring force equation. At the end, the outcome is displacement data in correlation to the change of bench set range. It helps the repair technician on the maintenance workshop of permissible ran...

In-cabin temperature control and multi-circuit bus air-conditioning systems were developed. The s... more In-cabin temperature control and multi-circuit bus air-conditioning systems were developed. The system work dependent on the cooling load either one or more circuits will automatically be switched on. One circuit of the system can have been varying speed in order to fine-tune the cooling response time as the cooling load varies inside bus cabin. Variable-speed compressor provides potential on the load-matching capability, energy saving and thermal comfort of the passengers inside bus cabin. The experiments were conducted on a test rig with temperature setting of 22°C for the conditioned space to evaluate the energy usage of the system with thermostat and fuzzy logic (FLC) controllers. The results indicate that the proposed technique can save energy and improve indoor comfort significantly for multi-circuit bus air-conditioning systems compared to the existing system. The experimental results also showed that more energy savings can be obtained through the use of FLC when compared to...

Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tin... more Tujuan penelitian ini adalah untuk meningkatkan prestasi dari alat destilasi surya basin tiga tingkat dengan menggunakan berbagai bahan penyimpan panas (aluminium, stainless steel dan seng), alat uji destilasi surya ini dapat berproduksi terus menerus selama 24 jam. luas kolektor bagian bawah 0,65 m2, bagian tengah 0,4 m2 dan bagian atas 0,4 m2.Prinsip kerja alat yaitu radiasi matahari dirubah menjadi energi panas pada kolektor, panas akan terkumpul di dalam plat penyerap dan memanaskan air laut yang berada pada setiap basin. Untuk meningkatkan produktivitas air bersih, diletakkan bahan penyimpan panas pada basin bagian bawah. Hasil pengujian menunjukkan pemakaian stainlees steel sebagai penyimpan panas dapat menghasilkan produktivitas air bersih lebih tinggi dibandingkan dengan bahan penyimpan panas dari seng dan aluminium.

Energy audit is one of the effective tools to identify potential of energy conservation and help ... more Energy audit is one of the effective tools to identify potential of energy conservation and help to identifyenergy waste in a facility or system. In commercial office building like the Faculty of MechanicalEngineering (FME) Academic Building, its air-conditioning system (AC) alone consumed almost 72.55% oftotal monthly FME energy consumption for both of its Split unit and Central Cooling System. The objectiveof this study is to find the energy usage and billing of the AC at FME Academic building and finally torecommend the possible methods for energy conservation related to the system. This energy audit is done byconducting system observation, acquire data and information such as maintenance record, electrical usage,room condition and analyse system performance. During data collecting and observation few cause werefound that lead to excess energy consumption for both systems that can be conserver in monetary term. Forexample, the VRV system that currently installed is expected to gi...

Vapor compression refrigeration cycle (VCRC) is widely used in freezers. In a simple cycle of the... more Vapor compression refrigeration cycle (VCRC) is widely used in freezers. In a simple cycle of the VCRC, refrigerant in the condenser exit is at liquid saturated line. If the refrigerant temperature in the condenser exit is further cooled to the subcooled region results in an increase in the cooling capacity due to low vapor quality of refrigerant entering the evaporator. The lower the refrigerant quality entering the evaporator, the higher the cooling capacity on the evaporator. The increase in the cooling capacity enhances the freezer performance. Subcooling uses liquid suction heat exchanger (LSHX) is applied to transfer heat from the exit of the condenser (liquid line) to the suction of the compressor. Because the temperature of liquid line is higher than that of the suction line, heat flows from liquid line to the suction line, results in the decrease in temperature of the exit of the condenser and the increase in the suction temperature (superheating). Consequently, the use of ...

Proceedings of The Conference on Management and Engineering in Industry

Power plants as electricity producers need to be maintained using monitoring performance and cont... more Power plants as electricity producers need to be maintained using monitoring performance and continuous improvements. Company management of power plant is difficult to make a decision for the continuous improvement, requires Performance Measurement Tools (PMT) to determine the performance of a gas engine power plant. PMT developed using Key Performance Indicator (KPI) that was defined through Forum Group Discussion (FGD) with different field of expertise in company and based on references and the weighting of KPI criterion that was developed by Analytic Hierarchy Process (AHP). This study has developed the weight of KPI that the weight of each criterion which will be used as a reference is Rank 1 – Power Output (MW) – PO (70.81%), Rank 2 – Heat Rate (Btu/kWh) – HR (14.91%), Operating Ratio (%) – OR (8.06%) and Rank 4 – Capacity Factor (%) – CF (6.22%).

Proceedings of The Conference on Management and Engineering in Industry

The availability and readiness of heavy equipment depends on the level of product support. Produc... more The availability and readiness of heavy equipment depends on the level of product support. Product support as after sales service is important for customers to ensure that heavy equipment purchased is always ready for use and produces optimal production. Leadtime and mechanic speed in solving problems that occur in equipment and the so called On Time in Full Solution (OTIF Solution) affects the usability and productivity of equipment. Performance OTIF Solution affects Product Support Performance, and this affects the level of customer satisfaction. The development of mechanic competencies through competency-based training and problems in the field with reference to the Special Work Competency Standards is a strategy to increase the ability and speed of mechanics to solve problems that occur in machines in order to get good OTIF Solution performance. This research aims to determine the impact of increasing competence. mechanic through training with a competency-based curriculum on pr...

Proceedings of The Conference on Management and Engineering in Industry

The government continues to encourage efforts to increase renewable energy, one of which is by is... more The government continues to encourage efforts to increase renewable energy, one of which is by issuing a ministerial regulation of energy and mineral resources (MEMR) 49/2018 with amendments no. 13/2019 and 16/2019. The key points of this policy are reducing the constant in charge capacity for industry, simplifying the licensing process and the existence of operating permits and certificates of operation feasibility, as well as compensation for export credit of 65% which is still deemed unfavorable. As of October 2020, 2,566 solar PV rooftop customers have registered, with a total capacity of 18.19 MWp. This research aims to not only analyze the gap policy, but also to make a case study in a Leading Heavy Equipment Company in Indonesia building on the existing PV rootop policy. By using a web-based simulation that is Helio Scope and the calculation of investment feasibility, the results are not economically profitable. This is due to the high investment value, interest rate value, a...