Combination of Dehumidifier, Heat Pump and Air Heater: Influence of Temperature, Specific Humidity, And Mass Flow Rate of Air on Specific Energy Consumption

Zikri, Ahmad; Kosasih, Engkos Achmad; Dzaky, Muhammad Irfan; Firdaus, Firdaus

doi:10.37934/arfmts.76.1.124134

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…Additionally, temperature is another main point for this system [11]. A desired temperature control is indispensable to accommodate all human needs and essential.…”

Section: Hot Water Systemmentioning

confidence: 99%

Newly Developed Thermal Load Profile for Enhancement in Hot Water System

Sazali

Nawi

Ghani

et al. 2021

ARFMTS

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In recent years with the advancement of technologies, the demand of a reliable and flexible hot water system has increased tremendously. A reliable system includes several critical points which are the degree of safety that a system can offer, the conservation of the energy used and the issue of cost saving. While a flexible system must provide the flexibility in the control of the output from a system desired by the consumers itself. This paper reported on newly developed system for hot water that will greatly benefit consumer. It focuses on building an extension of the cyber physical system in the existing system with purposes of implementing a thermal load profile for consumer who use the hot water system in their daily life. The implementation of the thermal load profile to the system is significant especially in conserving the energy used in the system simultaneously saving any related cost to operate the system. Based on the implemented thermal load profile, the system works in maintaining an output of thermal energy from the hot water supplied to the consumer at a certain value. In addition, it also allows flexibility in controlling the desired temperature by consumers. This new system is simulated in a test bench in the form of laboratory setup. The system uses a control loop feedback mechanism, which means that it will continuously regulate the temperature and mass flow rate of the flowed water in the pipeline for the consumer hot water simulation based on the calculated difference of the actual supplied values and the set values. With the use of standard devices and actuators to drive the system, a robust system can be realized.

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“…Additionally, temperature is another main point for this system [11]. A desired temperature control is indispensable to accommodate all human needs and essential.…”

Section: Hot Water Systemmentioning

confidence: 99%

Newly Developed Thermal Load Profile for Enhancement in Hot Water System

Sazali

Nawi

Ghani

et al. 2021

ARFMTS

View full text Add to dashboard Cite

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“…The electric heater acts as the primary air heater, while the heat source from the condenser is integrated with the cooling system. This refrigeration system helps to dry humid air at low temperatures in the evaporator refrigeration system [27,28]. Furthermore, the high-temperature condenser (output from the compressor) can be used for heat recovery.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Thin-Layer Drying of Coffee Beans Using a Double-Condenser Compression Refrigeration System: Effects of Air Mass Flux, Specific Humidity and Drying Temperature

Dzaky

Kosasih

Hakim

et al. 2023

ARFMTS

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The drying process is the key to the quality of the coffee produced. The allowable moisture content of coffee beans is 12%. The air mass flux, specific humidity, and the drying temperature are varied using a bed dryer drying system combined with a double condenser refrigeration system. Robusta coffee beans are used in this research to obtain the characterization of coffee beans. The highest drying rate constant is obtained by 2.44 × 10-4 s-1 directly proportional to the increased air mass flux and drying air temperature, with a value of 1.701 kg/s m2 and 80 °C, but inversely proportional to the specific humidity, with a value of 7.01 g/kg d.a. The lowest activation energy value was 31.88 kJ/mol when the air mass flux was 1.701 kg/s m2, the drying air temperature was 80 °C, and the average specific humidity was 7.01 g/kg d.a. In this work, the developed correlation is proposed to practically predict the activation energy (EA) and the pre-exponential factor (A) with equation and respectively. Based on Ea and A correlation equation, it can be used for designing a bed dryer type coffee drying system for a larger scale.

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“…Because the study by ( Zikri et al, 2020 ) focuses solely on the drying system, the SEC refers to the amount of energy required to generate dry air. When the RSEC value for a refrigeration system (with R134a as the working fluid) is less than 1, the energy consumption for a dehumidifier at the same refrigeration system heating temperature is lower than for just heating.…”

Section: Introductionmentioning

confidence: 99%