Comparison of approximation-assisted heat exchanger models for steady-state simulation of vapor compression system

Huang, Ransisi; Ling, Jiazhen; Aute, Vikrant

doi:10.1016/j.applthermaleng.2019.114691

Cited by 7 publications

(2 citation statements)

References 31 publications

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“…For the compression refrigeration machines, which work between the operating pressure limits of the condenser and evaporator, the following are assumed (Equation (29)–(32)): 1) isentropic efficiency of the compressor; [ 25,26 ] 2) the refrigerant in the output of the condenser as a saturated liquid; [ 25,26 ] 3) an isoenthalpy process in the throttle valve; [ 25,27 ] 4) the refrigerant as saturated steam in the output of the evaporator; [ 25,27 ] and 5) no heat loss between the water and the refrigerant in the condenser and evaporator. [ 25 ]

η = \frac{h_{o, s} - h_{i}}{h_{o} - h_{i}} \times 100 (%)

{\overset{m}{true}}_{i, w a t e r} {normalh}_{i, w a t e r} - {\overset{m}{true}}_{o, w a t e r} {normalh}_{o, w a t e r} = {\overset{m}{true}}_{o, R e f} {normalh}_{o, R e f} - {\overset{m}{true}}_{i, R e f} {normalh}_{i, R e f} (k W)

{normalh}_{normalo} = normalh...

…”

Section: Methodsmentioning

confidence: 99%

“…The cooling tower is modeled to obtain the amount of air needed to reduce the water temperature between the required limits, for which the mass and energy balances of air and water are used, as shown in Equation ( 26)-( 28). [20] m : For the compression refrigeration machines, which work between the operating pressure limits of the condenser and evaporator, the following are assumed (Equation ( 29)-( 32)): 1) isentropic efficiency of the compressor; [25,26] 2) the refrigerant in the output of the condenser as a saturated liquid; [25,26] 3) an isoenthalpy process in the throttle valve; [25,27] 4) the refrigerant as saturated steam in the output of the evaporator; [25,27] and 5) no heat loss between the water and the refrigerant in the condenser and evaporator. [25] η…”

Section: Item Value Referencementioning

confidence: 99%

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Advanced Exergy and Exergoeconomic Analysis of a Gas Power System with Steam Injection and Air Cooling with a Compression Refrigeration Machine

et al. 2021

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Gas turbine power plants have been widely studied, and as a result the negative effects on their output power and thermal efficiency have been known when operating in atmospheric conditions exceeding ISO conditions. For this reason, different technologies and methodologies have been implemented, aiming to increase the output power and improve the thermal efficiency. Unfortunately, the lack of operational parameters for this system limited its characterization and implementation of strategies to improve its performance. Advanced exergetic and exergoeconomic analyses have been applied to improve energy and economic performance in steam injection gas turbine (STIG) cycle power plants with air cooling with a compression refrigeration machine. Results shows that the main sources of irreversibilities and higher costs are in the Combustion Chamber (CC), Heat Recovery Steam Generator (HRSG) and Gas Turbine (GT). From these components, the components of the HRSG and GT have the greatest potential for improvement, and this can be achieved by improving the overall configuration of the system, due to the fact that the destruction of exogenous exergy is in more significant measure avoidable. While the higher costs of investment can be reduced in the Combustion Chamber and Gas Turbine.

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