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RISS 인기검색어
- 검색키워드
- 저자 : N. D. Banker (검색결과 3 건)
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Vaidhyanathan Ashwath,Banker N. D. 대한설비공학회 2020 International Journal Of Air-Conditioning and Refr Vol.28 No.2
Recently, renewable sources of energy, particularly, solar thermal energy, have gained significant attention for developing heating and cooling mechanisms for buildings. This work aims at developing a theoretical model for space heating based on phase change material (PCM) using solar energy in winter conditions for the Northern region of India. The system has two PCM containers placed inside the room on the two opposite walls, which receives heat from concentrating solar system during the daytime. After achieving the temperature of PCM above its melting point using the solar system, the stored heat of PCM is released to the room ambient during the nighttime when the room ambient is at lower temperature. OM-37, having melting temperature of [Formula: see text]C, has been used as a PCM for the current research work. The numerical investigation of the system shows that temperature of the room reaches to 26–[Formula: see text]C from [Formula: see text]C in 4–5[Formula: see text]h of operation and thus ensuring thermal comfort of occupants.
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Devendra Dandotiya,N. D. Banker 대한설비공학회 2017 International Journal Of Air-Conditioning and Refr Vol.25 No.4
Tropical countries like India, the ambient temperature reaches to 45–50 ∘ C in the summer and higher ambient temperature directly impacts the energy required by the household refrigerator. This paper presents an experimental performance of a domestic refrigerator incorporated with a phase change material (PCM)-based condenser in parallel to the conventional wire-and-tube air-cooled condenser for the climatic conditions of India. It is proposed to operate the refrigerator with the PCM-based condenser, while the ambient temperature is higher during the day, otherwise with the air-cooled condenser. Due to large latent heat storage capacity of the PCM, the condenser temperature would not increase significantly. The COP of the PCM-based condenser was 28% higher as compared to air cooled condenser for 60 min which reduce to 3% as PCM temperature reached to 33 ∘C. The energy consumption is lower by ∼15 ∼15 % in 3 12 312h of refrigerator experimentation with the proposed modification.
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Varuneswara Reddy Panyam,Veda Sai Kolla,Lokesh Palawat,Ayush Sahu,N. D. Banker 대한설비공학회 2018 International Journal Of Air-Conditioning and Refr Vol.26 No.1
Presently, to enhance the thermal efficiency of a gas turbine power plant, turbine inlet air cooling (TIAC) is the widely used technique. The conventional refrigeration methods like vapor compression refrigeration and evaporative cooling need electric power, hence absorption and adsorption refrigeration systems are attractive options as they can be powered using the waste heat energy of the exhaust gases. Adsorption system has advantages over absorption system like scalability, requirement of lower heat source temperature, absence of corrosion and crystallization. This paper focuses on the thermodynamic analysis of waste heat powered adsorption chiller used for the cooling of intake air to enhance the net power output of the gas turbine power plant. This paper also presents a comparative analysis of the vapor-adsorption cycle-based TIAC system for four different refrigerants viz. HFC-134a, carbon dioxide, ethanol and ammonia with the motive of finding a substitute refrigerant for HFC-134a which has a high global warming potential (GWP). The adsorption chiller is mathematically modeled in MATLAB with activated carbon as the adsorbent and each one of carbon dioxide, ethanol and ammonia as the adsorbate. The variation of the coefficient of performance (COP) and specific cooling effect (SCE) with varying adsorption temperatures is presented for each pair. The net power output and primary energy rate (PER) improvement of the gas turbine power plant at different ambient temperatures are also discussed. It is observed that ammonia can improve the power plant performance significantly better compared to the other three refrigerants at ambient temperatures less than 40 ∘ ∘C.
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