Assessment of a novel heat-driven cycle to produce shaft power and refrigeration

Sami M. Alelyani, Jonathan A. Sherbeck, Nicholas W. Fette, Yuqian Wang, Patrick Phelan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper proposes a novel combined cooling and power (CCHP) system based on a composition of a Rankine, gas refrigeration (reverse Brayton), liquid desiccant, ejector, and evaporative cooling cycles. The two proposed configurations, called the original cycle (OC) and the enhanced cycle (EC), utilize heat rejected by the Rankine cycle via its condenser in order to regenerate the liquid desiccant cycle. The desiccant cycle allows the cooling systems to decouple sensible and latent loads, and potentially reduce water consumption relative to pure evaporative cooling. Based on our thermodynamic calculations, the OC and EC are more feasible from an energy-saving viewpoint compared with separate systems that provide the same services for sensible heat ratios (SHR) less than 14% and 39%, respectively. At a fixed heat source input of about 2.4 MWth at 210 °C, the OC is capable of generating 103 kWe of electrical power, 181 kWth of sensible cooling, 1631 kWth of latent cooling capacity, and fresh water at 2.7 m3/h capacity. At a SHR of 10%, the OC can achieve an exergy efficiency and primary energy saving ratio (PESR) of 24% and 28%, respectively. Similarly, and at the same thermal energy input, the EC can supply 354 kWe, 400 kWth, and 1199 kWth, and 1.8 m3/h of electrical power, sensible cooling capacity, latent cooling capacity, and fresh water capacity, respectively, at a SHR of 25%. Furthermore, the EC is more efficient than both the OC and stand-alone conventional systems as it shows a higher exergy efficiency of 53% and PESR of 29%.

Original languageEnglish (US)
Pages (from-to)751-764
Number of pages14
JournalApplied Energy
Volume215
DOIs
StatePublished - Apr 1 2018

Fingerprint

Refrigeration
shaft
Cooling
cooling
Energy conservation
Exergy
exergy
electrical power
Water
Rankine cycle
Liquids
liquid
Hot Temperature
refrigeration
Thermal energy
Cooling systems
heat source
Thermodynamics
thermodynamics
water

Keywords

  • Combined cooling and power
  • Combined cooling heating and power
  • Polygeneration
  • Tri-generation

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

Cite this

Assessment of a novel heat-driven cycle to produce shaft power and refrigeration. / Alelyani, Sami M.; Sherbeck, Jonathan A.; Fette, Nicholas W.; Wang, Yuqian; Phelan, Patrick.

In: Applied Energy, Vol. 215, 01.04.2018, p. 751-764.

Research output: Contribution to journalArticle

Alelyani, Sami M. ; Sherbeck, Jonathan A. ; Fette, Nicholas W. ; Wang, Yuqian ; Phelan, Patrick. / Assessment of a novel heat-driven cycle to produce shaft power and refrigeration. In: Applied Energy. 2018 ; Vol. 215. pp. 751-764.
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AB - This paper proposes a novel combined cooling and power (CCHP) system based on a composition of a Rankine, gas refrigeration (reverse Brayton), liquid desiccant, ejector, and evaporative cooling cycles. The two proposed configurations, called the original cycle (OC) and the enhanced cycle (EC), utilize heat rejected by the Rankine cycle via its condenser in order to regenerate the liquid desiccant cycle. The desiccant cycle allows the cooling systems to decouple sensible and latent loads, and potentially reduce water consumption relative to pure evaporative cooling. Based on our thermodynamic calculations, the OC and EC are more feasible from an energy-saving viewpoint compared with separate systems that provide the same services for sensible heat ratios (SHR) less than 14% and 39%, respectively. At a fixed heat source input of about 2.4 MWth at 210 °C, the OC is capable of generating 103 kWe of electrical power, 181 kWth of sensible cooling, 1631 kWth of latent cooling capacity, and fresh water at 2.7 m3/h capacity. At a SHR of 10%, the OC can achieve an exergy efficiency and primary energy saving ratio (PESR) of 24% and 28%, respectively. Similarly, and at the same thermal energy input, the EC can supply 354 kWe, 400 kWth, and 1199 kWth, and 1.8 m3/h of electrical power, sensible cooling capacity, latent cooling capacity, and fresh water capacity, respectively, at a SHR of 25%. Furthermore, the EC is more efficient than both the OC and stand-alone conventional systems as it shows a higher exergy efficiency of 53% and PESR of 29%.

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