A parametric study of transcritical CO2 simple cooling cycle and combined power cycle

Sahu, Anjan Kumar; Agrawal, Neeraj; Nanda, Pradipta Kumar

doi:10.1093/ijlct/ctx006

Cited by 7 publications

(7 citation statements)

References 16 publications

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“…The output power generated by the supercritical CO 2 power cycle is employed to operate the compressor of a CO 2 refrigeration cycle, as indicated by the analysis results. [19][20][21][22][23] In this research, we propose a hybrid RO-MED-FD desalination system to enhance the sustainability of desalination. The key advantage of this hybrid system is its ability to reduce energy consumption while increasing desalination recovery.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the energy consumption of hybrid desalination RO‐MED‐FD to reduce rejected brine

Salajeghe,

Ameri

2023

Env Prog and Sustain Energy

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The escalating global capacity of desalination plants has posed a significant environmental threat due to the discharge of brine. Consequently, urgent treatment of these hypersaline brines has become imperative. This article provides an overview of a novel hybrid model for water desalination. Energy consumption and brine discharge of three desalination configurations, namely freeze desalination (FD), multi‐effect desalination (MED), and reverse osmosis (RO), are compared. The configurations encompass FD, MED‐FD, and RO‐MED‐FD, with FD utilizing the brine from MED and RO desalination. The hybrid desalination system integrates with combined power and cooling CO2 system (CPCS‐CO2) for energy supply. This hybridization offers enhanced operational flexibility, increased desalination capacity, and reduced brine discharge. Optimal gas heater pressure exists for different temperatures and salt concentrations in saline water. The findings demonstrate a noteworthy 47% and 50% reduction in energy consumption and brine discharge, respectively, in RO‐MED‐FD compared to simple FD.

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Section: Introductionmentioning

confidence: 99%

“…Carbon dioxide easily transitions to the supercritical phase at its critical points of 31.1°C and 7.38 MPa, causing the refrigeration cycle to operate in a supercritical state in warmer climates, resulting in reduced system performance. Nonetheless, the excess heat lost in the gas cooler can be utilized for heating applications 17,18 …”

Section: Introductionmentioning

confidence: 99%

Evaluation of the energy consumption of hybrid desalination RO‐MED‐FD to reduce rejected brine

Salajeghe,

Ameri

2023

Env Prog and Sustain Energy

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“…Only a few studies are mentioned on the proposal and analysis of CO 2 based refrigeration cycle applied for the recovery of engine waste heat. 32,33,34 Sahu et al 35 presented a parametric study for both the simple transcritical CO 2 refrigeration cycle and the combined refrigeration-power cycle. It was reported that the COP and second law-efficiency of the combined refrigeration-power cycle is significantly higher than those of the simple refrigeration cycle.…”

Section: Introductionmentioning

confidence: 99%

Investigation on novel natural gas fueled homogeneous charge compression ignition engine based combined power and cooling system

Al-Mughanam,

Khaliq

2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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A significant part of energy of fuel supplied is lost in internal combustion engines in the form of atmospheric discharge of engine exhaust gases which are considered as a big source of engine inefficiency and formation of pollutant emissions. To address this issue, a bottoming cycle combining the transcritical CO2 (T-CO2) refrigeration cycle and the supercritical CO2 (sCO2) power cycle is employed, aiming to produce cooling for food preservation by utilizing the exhaust heat of homogeneous charge compression ignition (HCCI) engine powering the refrigerated truck. The operative variables and their effect on thermal and exergetic efficiency of HCCI engine and the combined system are investigated. At the base case operative conditions, the thermal and exergy efficiencies of natural gas fueled HCCI engine are improved significantly from 48.69% to 61.28% and from 41.14% to 42.79%, respectively, after employing the sCO2 powered T-CO2 refrigeration cycle. Promotion of equivalence ratio from 0.3 to 0.9 enhances the thermal and exergy efficiencies of HCCI engine from 47.44% to 49.54% and from 40.14% to 42.12%, respectively. Increasing of engine speed from 1400 r.p.m to 2200 r.p.m provides marginal improvement in HCCI engine efficiencies but the efficiencies of combined cycle are significantly improved from 57.67% to 65.18% and from 40.64% to 45.06%, respectively. Finally, exergy analysis applied to determine the sources of non-idealities within the system revealed that out 361 kW (100%) fuel exergy supplied to the system, HCCI engine destroys 93.31 kW (25.85%), catalytic convertor destroys15.49 kW (4.29%), and the in-cylinder heat transfer losses and system exhaust losses are found as 35.72 kW (9.91%) and 16.61 kW (4.61%), respectively.

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“…(2017) tarafından yapılan parametrik bir çalışmada, Evaporatör sıcaklığı, gaz soğutucu çıkış sıcaklığı, gaz ısıtıcı basıncı ve türbin giriş sıcaklığı gibi çeşitli parametrelerin performans katsayısı (COP) ve ikinci yasa verimliliği üzerindeki etkisi araştırılmıştır. [10]. Su Kaynaklı Transkritik CO2 ısı pompası su ısıtıcısının performansı üzerine Liu ve ark (2017) deneysel çalışma yapmışlardır.. Musluk suyunun akış oranına ve suyun kaynak sıcaklığına pozitif şekilde bağlı olduğu söylenmiş, ek olarak musluk suyu akış oranın, maksimum ısıtma kapasitesinde önemsiz derecede etkiye sahip olduğu ve ısıtma kapasitesini büyük oranda arttırdığı belirtilmiştir [11].…”

Section: Introductionunclassified

Co2 Soğutucu Akişkani İle Çalişan Transkri̇ti̇k Bi̇r Isi Pompasi Si̇stemi̇ni̇n Farkli Basinçlarda Termodi̇nami̇k Anali̇zi̇

ELBİR¹,

Bayrakçı²,

Özgür³

et al. 2022

Teknik Bilimler Dergisi

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ÖzTranskritik bir çalışma sisteminin deneysel olarak çalışılması sonucunda alınan sonuçlar sunulmuştur. Tek kademeli olarak ve basınç değerleri önceki çalışmalara göre daha da arttırılarak çalıştırılmıştır; 75 bar gaz soğutucu basıncının 100 bar gaz soğutucu basıncına çıkarıldığında ve sudan suya soğutma sağlayan suyun kütlesel debisini artırılması ile aynı sistemde deney sonuçlarının termodinamik kurallara göre nasıl değişeceği ve hangi unsurlarla değişim göstereceği grafiklerle ve resimler ile sunulmuştur. Birinci deneyde 75 bar gaz soğutucu basıncında, ikinci sistemde 100 bar gaz soğutucu basıncında çalıştırılarak adlandırılmıştır. Gaz soğutucu basıncının %33, buna karşılık evaporatör basıncının da %57 artması ile sistemde değişimler incelenmiştir. COPıstm değerine %148 bir artış getirmiş, toplam ekserji kaybı % 3.2 artmış ve kütlesel su soğutma debisi %100 artmıştır. Vanadaki basınç değişimleri ekserji verimini %10,3 arttırmıştır. Soğutucu akışkan kütlesindeki %95,2'lik artış kompresörün elektirik tüketimini %24,4 arttırmıştır. Kompresörün izentropik verimi ve kılcal borunun ekserji verimi basıncın artması ile %10 artmıştır.

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A parametric study of transcritical CO2 simple cooling cycle and combined power cycle

Cited by 7 publications

References 16 publications

Evaluation of the energy consumption of hybrid desalination RO‐MED‐FD to reduce rejected brine

Evaluation of the energy consumption of hybrid desalination RO‐MED‐FD to reduce rejected brine

Investigation on novel natural gas fueled homogeneous charge compression ignition engine based combined power and cooling system

Co2 Soğutucu Akişkani İle Çalişan Transkri̇ti̇k Bi̇r Isi Pompasi Si̇stemi̇ni̇n Farkli Basinçlarda Termodi̇nami̇k Anali̇zi̇

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