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Efficiency Improvement and Cost Analysis of a New Combined Absorption Cooling and Power System

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Synergy Development in Renewables Assisted Multi-carrier Systems

Part of the book series: Green Energy and Technology ((GREEN))

Abstract

Serious concerns like population growth, environmental pollution due to excessive waste disposal, fossil fuels consumption in order to provide high energy demands, global warming, ozone depletion, and acid rainfalls have led energy policymakers to recommend solutions to resolve these challenges. In this regard, the cogeneration of electricity and cooling is a technology to solve the mentioned formidable obstacles. The present study introduces a practical but straightforward simultaneous power and cooling plant executed by a natural gas-fired open Brayton cycle. The bottoming process utilizes an ammonia-water mixture. To be more specific, the thermodynamic and thermoeconomic model of the process was assessed in the engineering equation solver (EES). The effect of the significant variables of the proposed cycle is also studied based on the overall system performance criteria. As a result, the highest exergy destruction is for the Brayton cycle, 44.89% of the total irreversibility, followed by the boiler and mixer in the absorption cycle, and the smallest amount of irreversibility belongs to the evaporator, with 0.14%. The parametric study results demonstrate that minimizing the air temperature entering the combustor will improve the studied system. To deduce, the cogeneration unit is optimized based on the second law efficiency as an objective function. In turn, the optimization results illustrate an enhancement in exergy efficiency and unit cost of products by 21.73% and 4.13%.

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Abbreviations

\(\dot{{E}}\) :

Exergy rate (kW)

\(\dot{{m}}\) :

Mass flow rate (kg/s)

P :

Pressure (bar)

LHV :

Lower heating value (kJ/kg)

\({\rm P}\) :

Density (kg/\({m}^{3}\))

y :

Exergy destruction ratio

\(\dot{{Q}}\) :

Heat transfer rate (kW)

h :

Specific enthalpy (kJ/kg)

s :

Specific entropy (kJ/kgK)

T :

Temperature (K)

\(\dot{{W}}\) :

Power (kW)

PEC :

Purchased Equipment Cost ($)

\(\dot{{C}}\) :

Cost rate ($/h)

\(c\) :

The unit cost of exergy ($/GJ)

\(\dot{{Z}}\) :

Purchased Equipment Cost rate ($/h)

CCHP :

Combined cooling, heating, and power

SG :

Steam generator

AC :

Air compressor

cond :

Condenser

Eva :

Evaporator

EV :

Expansion valve

Δ :

Difference

η :

Thermal efficiency (%)

\(\eta_{II}\) :

Exergy efficiency (%)

CH :

Chemical

PH :

Physical

th :

Thermal

0 :

Dead state

F :

Fuel (exergy)

P :

Product (exergy)

D :

Destruction

L :

Loss

is :

Isentropic

CV :

Control Volume

v :

Vapor

l :

Liquid

sys :

System

0 :

Dead state

s :

Isentropic

in :

Inlet

LMTD :

The logarithmic mean temperature difference

Mix :

Mixer

PP :

Pinch point

s :

Constant entropy

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Authors and Affiliations

  1. Faculty of Mechanical Engineering, Sahand University of Technology, Sahand New Town, Tabriz, Iran

    Farzin Javanfam, Hamed Ghiasirad & Rahim Khoshbakhti Saray

Authors
  1. Farzin Javanfam
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  2. Hamed Ghiasirad
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  3. Rahim Khoshbakhti Saray
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Corresponding author

Correspondence to Rahim Khoshbakhti Saray .

Editor information

Editors and Affiliations

  1. Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran

    Majid Amidpour

  2. Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran

    Mohammad Ebadollahi

  3. Department of Power System Operation and Planning, Niroo Research Institute, Tehran, Iran

    Farkhondeh Jabari

  4. Energy and Environmental Research Center, Niroo Research Institute, Tehran, Iran

    Mohammad-Reza Kolahi

  5. Faculty of Engineering, University of Mohaghegh Ardabili, Ardabil, Iran

    Hadi Ghaebi

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Javanfam, F., Ghiasirad, H., Khoshbakhti Saray, R. (2022). Efficiency Improvement and Cost Analysis of a New Combined Absorption Cooling and Power System. In: Amidpour, M., Ebadollahi, M., Jabari, F., Kolahi, MR., Ghaebi, H. (eds) Synergy Development in Renewables Assisted Multi-carrier Systems. Green Energy and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-90720-4_2

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  • DOI: https://doi.org/10.1007/978-3-030-90720-4_2

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  • Online ISBN: 978-3-030-90720-4

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