Development of a novel rotary desiccant cooling cycle with isothermal dehumidification and regenerative evaporative cooling using thermodynamic analysis method

La, Dong; Li, Y.; Dai, Yanjun; Ge, T.S.; Wang, R.Z.

doi:10.1016/j.energy.2012.05.016

Cited by 39 publications

(17 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On operation, the working air initially enters dry channels and is fractionated into multiple streams which are directed into the wet channels through the holes. However, some variants (often called regenerative evaporative coolers) do not have holes but redirect a portion of the air exiting the dry channel into the wet channel [104][105][106]. As a result of evaporation, the air in the wet channel absorbs heat from the product air flowing in the adjacent side.…”

Section: Indirect Evaporative Coolersmentioning

confidence: 99%

Solar pond powered liquid desiccant evaporative cooling

Elsarrag

Igobo

Alhorr

et al. 2016

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

Liquid desiccant cooling systems (LDCS) are energy efficient means of providing cooling, especially when powered by low-grade thermal sources. In this paper, the underlying principles of operation of desiccant cooling systems are examined, and the main components (dehumidifier, evaporative cooler and regenerator) of the LDCS are reviewed. The evaporative cooler can take the form of direct, indirect or semi-indirect. Relative to the direct type, the indirect type is generally less effective. Nonetheless, a certain variant of the indirect type -namely dew-point evaporative cooler -is found to be the most effective amongst all. The dehumidifier and the regenerator can be of the same type of equipment: packed tower and falling film are popular choices, especially when fitted with an internal heat exchanger. The energy requirement of the regenerator can be supplied from solar thermal collectors, of which a solar pond is an interesting option especially when a large scale or storage capability is desired.

show abstract

Section: Indirect Evaporative Coolersmentioning

confidence: 99%

Solar pond powered liquid desiccant evaporative cooling

Elsarrag

Igobo

Alhorr

et al. 2016

Renewable and Sustainable Energy Reviews

View full text Add to dashboard Cite

show abstract

“…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%

“…La et al [12,16] investigated the performances of a ventilation system from the perspective of exergy destructions. It was found that exergy destructions of the desiccant wheel and the heat source accounted for around 50% the total exergy destruction.…”

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

“…Starting from the first system with desiccant wheel (DW) proposed by Pennington [3], other configurations such as recirculation cycle [4], Dunkle cycle [4,5], simplified advanced solid desiccant (SENS) cycle [4,6], revers cycle [4,6], direct-indirect evaporative coolers (DINC) cycle [4,6], and cycles with staged dehumidification/regeneration in one or two rotors [7][8][9][10] were introduced.…”

Section: Introductionmentioning

confidence: 99%

Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

et al. 2016

View full text Add to dashboard Cite

Abstract:In this paper, three alternative layouts (scenarios) of an innovative solar-assisted hybrid desiccant-based air handling unit (AHU) are investigated through dynamic simulations. Performance is evaluated with respect to a reference system and compared to those of the innovative plant without modifications. For each scenario, different collector types, surfaces and tilt angles are considered. The effect of the solar thermal energy surplus exploitation for other low-temperature uses is also investigated. The first alternative scenario consists of the recovery of the heat rejected by the condenser of the chiller to pre-heat the regeneration air. The second scenario considers the pre-heating of regeneration air with the warmer regeneration air exiting the desiccant wheel (DW). The last scenario provides pre-cooling of the process air before entering the DW. Results reveal that the plants with evacuated solar collectors (SC) can ensure primary energy savings (15%-24%) and avoid equivalent CO 2 emissions (14%-22%), about 10 percentage points more than those with flat-plate collectors, when the solar thermal energy is used only for air conditioning and the collectors have the best tilt angle. If all of the solar thermal energy is considered, the best results with evacuated tube collectors are approximately 73% in terms of primary energy saving, 71% in terms of avoided equivalent CO 2 emissions and a payback period of six years.

show abstract

Development of a novel rotary desiccant cooling cycle with isothermal dehumidification and regenerative evaporative cooling using thermodynamic analysis method

Cited by 39 publications

References 26 publications

Solar pond powered liquid desiccant evaporative cooling

Solar pond powered liquid desiccant evaporative cooling

Second Law Analysis of an Adsorption Air-Conditioning System

Performance Assessment of a Solar-Assisted Desiccant-Based Air Handling Unit Considering Different Scenarios

Contact Info

Product

Resources

About