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Performance evaluation of absorption cooling system for air conditioning-based novel trigeneration system using solar energy

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Abstract

This work aims to exploit the waste heat from a basic helium Brayton cycle (HBC) driven by a solar power tower (SPT). The two subsystem heat recovery steam generator (HRSG) and vapour absorption cooling system (VACS) have been implemented to recover the waste heat, respectively, for heating to generate steam and cooling for air conditioning. A comprehensive exergy and energy analysis of this proposed trigeneration system was carried out with parametric analysis. For analysis purpose Engineering Equation Solver software has been used. It was concluded that energy and exergy efficiency and net work output of the proposed trigeneration system were observed as 44.96%, 34.15%, 14,562 kW, respectively. The heating production through the HRSG was obtained 8510 kW while the cooling production by VACS as 115.10 kW. Moreover, coefficient of performance (COP) of the VACS subsystem was observed as 0.8015. Energy and exergy efficiency of the SPT operated basic HBC using the subsystems was improved by 58.98% and 12.92%, respectively. Parametric analysis revealed that the helium turbine inlet temperature and solar heliostat field efficiency much affected the trigeneration system performance.

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Abbreviations

CR:

Central receiver

HBC:

Helium Brayton cycle

SPT:

Solar power tower

SHE:

Solution heat exchanger

SCO2 :

Supercritical CO2

VACS:

Vapour absorption cooling system

ORC:

Organic Rankine cycle

IHE:

Intermediate heat exchanger

HC:

Helium compressor

HT:

Helium turbine

COP:

Coefficient of performance

CPR:

Compressor pressure ratio

CIT:

Compressor inlet temperature

HTIT:

Helium turbine inlet temperature

DNI:

Direct normal irradiation (W/m2)

HRSG:

Heat recovery steam generator

\(\mathop {{\text{EX}}}\limits^{ \cdot }\) :

Rate of exergy (kW)

h :

Specific enthalpy (kJ/kg)

\(\dot{W}\) :

Power (kW)

\({N}_{{\text{hel}}}\) :

Number of heliostats

\(\dot{Q}\) :

Rate of heat interaction (kW)

T :

Temperature (K)

\(\mathop {{\text{ED}}}\limits^{ \cdot }\) :

Exergy destruction rate (kW)

A :

Area (m2)

s :

Specific entropy (kJ/kg K)

\(\dot{m}\) :

Mass flow rate (kg/s)

c:

Condenser

e:

Exit/evaporator

g:

Generator

j :

Particular state

rec:

Receiver

ref:

Reference/reflectivity

hel:

Heliostat

i:

Inlet

0:

Dead condition

tri:

Trigeneration

co:

Cogeneration

ex:

Exergy

en:

Energy

\(\eta\) :

Efficiency

ε :

Effectiveness

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Authors and Affiliations

  1. Department of Mechanical Engineering, Delhi Technological University, Bawana Road, Delhi, 110042, India

    Shobhit Mishra & Raj Kumar Singh

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  1. Shobhit Mishra
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Mishra, S., Singh, R.K. Performance evaluation of absorption cooling system for air conditioning-based novel trigeneration system using solar energy. J Braz. Soc. Mech. Sci. Eng. 46, 354 (2024). https://doi.org/10.1007/s40430-024-04943-6

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