Performance analysis of ventilation systems with desiccant wheel cooling based on exergy destruction

Tu, Rang; Liu, Xiaohua; Hwang, Yunho; Ma, Fei

doi:10.1016/j.enconman.2016.06.013

Cited by 30 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where, Tj represents the device's operating temperature, j Q denotes the amount of heat transfer associated with the device, and The exergy balance for the whole system as well as individual components can be represented as (Tu et al 2016):…”

Section: Exergy Analysismentioning

confidence: 99%

See 1 more Smart Citation

Thermodynamics and Economic Analysis of a Two-Stage Desiccant Cooling (TSDC) System Based on Biomass Heating for a Greenhouse Application

Mandal

Ganguly

2022

Preprint

View full text Add to dashboard Cite

This paper proposes a novel scheme of biomass regenerated two-stage desiccant-supported greenhouse cooling in the tropical and sub-tropical countries. The system's goal is to provide the ideal thermal environment inside a greenhouse for the growth of different kinds of Orchid. The two-stage desiccant-based cooling is used in the proposed system to obtain a low humidity ratio inside the greenhouse. The desiccant is regenerated using a biomass-based heating system. The first law analysis and the exergy analysis of the system's individual components have been included in the study. The results of the thermal model (greenhouse temperature) have been compared with that of a reference model study available in the literature. With a mean absolute error for the humidity ratio and greenhouse air temperature of 4.3 percent and 4.5 percent, respectively. The model's predictions are in good agreement with the results of the reference model. The performance study of the proposed system reveals that the maximum temperature of the greenhouse air can be limited within the defined values even during July and September, when both the ambient humidity and the temperature are high. The proposed system COPth varies from a minimum of 0.54 to a maximum of 1.02 for a typical hot and humid day of July. The system can exhibit maximum exergy efficiency of 33% in the morning, while the ultimate exergy destruction occurs at the DW1 (39.25%) and regeneration heater (21.69%). The payback period of the proposed system is 8.2 years considering 15 years’ life span.

show abstract

Section: Exergy Analysismentioning

confidence: 99%

“…Component-wise exergy calculation summary(Panaras et al 2011;Ali Mandegari et al 2015;Tu et al 2016;Tavakol and Behbahaninia 2018;Asadi and Roshanzadeh 2019).…”

mentioning

confidence: 99%

Thermodynamics and Economic Analysis of a Two-Stage Desiccant Cooling (TSDC) System Based on Biomass Heating for a Greenhouse Application

Mandal

Ganguly

2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Electric heater is used for heating the regeneration air before entering into the rotary dehumidifier (state 14). After the regeneration air passes from the desiccant wheel (process 14-15), its moisture contents increase and it is sent into another part of heat exchanger 3 (process [15][16]. Finally the regeneration air is discharged to atmosphere [19].…”

Section: Methodsmentioning

confidence: 99%

“…Exergy analysis has be conducted for desiccant cooling systems by many researchers [12][13][14][15][16]. La et al [12,16] investigated the performances of a ventilation system from the perspective of exergy destructions.…”

Section: Introductionmentioning

confidence: 99%

Second Law Analysis of an Adsorption Air-Conditioning System

Hürdoğan¹,

Kara²,

Kula³

et al. 2016

CSJ

View full text Add to dashboard Cite

Abstract. Air conditioning systems are designed to improve people's living standards and provide comfort. The use of this system brings together with environmental problems, energy consumption and costs. These problems can be reduced by making studies on energy efficiency and saving in air conditioning systems. Adsorption (dehumidification, desiccant) air conditioning systems, which have widely being used in recent years, can be evaluated in terms of energy efficiency. In this study, a desiccant based air-conditioning system was considered to evaluate the system performance by using second law analysis (exergy analysis) for Yozgat province. Psychometric properties for each state and system performance parameters were calculated using Engineering Equation Solver (EES). It was found from the results that maximum exergy destruction occurs in electric heater unit and the total exergy destruction of the system is 24.66 kW. It was also found that the exergy efficiency of this system is 19.87 %. The results showed that this system can be used for air conditioning in Yozgat climate conditions and the performance of the system can be increased by using waste heat or renewable energy resources for regeneration heat.Keywords Air conditioning, Second law analysis, exergy, irreversibility Adsorbsiyonlu Bir İklimlendirme Sisteminin İkinci Yasa AnaliziÖzet. İklimlendirme sistemleri insanların yaşam standartlarını yükseltmek ve konfor sağlamak için tasarlanmaktadır. Bu sistemlerin kullanımı enerji tüketimi, enerji maliyetleri ve çevre problemlerini de beraberinde getirir. Bu problemler, iklimlendirme sistemlerinde enerji verimliliği ve tasarrufuna yönelik çalışmalar yapılarak azaltılabilmektedir. Enerji verimliliği açısından değerlendirilebilecek iklimlendirme sistemlerinden biride son yıllarda yaygın bir şekilde kullanılmakta olan adsorbsiyonlu (nem almalı, desisif) iklimlendirme sistemleridir. Bu çalışmada, nem almalı bir iklimlendirme sistemi ele alınarak sistem performansı, ikinci yasa analizi (ekserji analizi) yapılarak Yozgat iklim şartları için değerlendirilmiştir. Sistemde bulunan bütün noktaların psikrometrik özellikleri ve sistem performans parametreleri, Engineering Equation Solver (EES) programı kullanılarak hesaplanmıştır. Yapılan çalışma sonunda ele alınan sistemde en çok tersinmezliğin (ekserji yıkımı) ısıtma ünitesinde meydana geldiği ve sistemin toplam tersinmezliğin 24.66 kW olduğu tespit edilmiştir. Ayrıca sistem ikinci yasa (ekserji) verimi %19.87 olarak hesaplanmıştır. Elde edilen sonuçlardan sistemin Yozgat iklim şartlarında iklimlendirme uygulamalarında kullanılabileceği ayrıca bu tür sistemlerde rejenerasyon ısısının elde edilmesinde atık ısı veya yenilenebilir enerji kaynaklarının kullanımıyla sistem performansının arttırılabileceği belirlenmiştir.

show abstract

Thermodynamics and economic analysis of a two-stage desiccant cooling (TSDC) system based on biomass heating used for greenhouse application

Mandal,

Ganguly

2024

J Therm Anal Calorim

View full text Add to dashboard Cite

Performance analysis of ventilation systems with desiccant wheel cooling based on exergy destruction

Cited by 30 publications

References 37 publications

Thermodynamics and Economic Analysis of a Two-Stage Desiccant Cooling (TSDC) System Based on Biomass Heating for a Greenhouse Application

Thermodynamics and Economic Analysis of a Two-Stage Desiccant Cooling (TSDC) System Based on Biomass Heating for a Greenhouse Application

Second Law Analysis of an Adsorption Air-Conditioning System

Thermodynamics and economic analysis of a two-stage desiccant cooling (TSDC) system based on biomass heating used for greenhouse application

Contact Info

Product

Resources

About