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Thermodynamic analysis and optimization of a high temperature triple absorption heat transformer.

Khamooshi M, Parham K, Yari M, Egelioglu F, Salati H, Babadi S - ScientificWorldJournal (2014)

Bottom Line: First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair.A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters.The optimization results showed that the COP of 0.2491 is reachable by the proposed cycle.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, North Cyprus, Mersin 10, Turkey.

ABSTRACT
First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair. A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters. The assumed parameters are the temperature of the main components, weak and strong solutions, economizers' efficiencies, and bypass ratios. The whole cycle is optimized by EES software from the viewpoint of maximizing the COP via applying the direct search method. The optimization results showed that the COP of 0.2491 is reachable by the proposed cycle.

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Related in: MedlinePlus

Schematic diagram of a triple absorption heat transformer.
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Related In: Results  -  Collection


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fig2: Schematic diagram of a triple absorption heat transformer.

Mentions: Figure 2 displays the modified configuration of the triple absorption heat transformer. This cycle mainly consists of a generator, a condenser, an evaporator, an absorber, two absorber/evaporators, and three economizers. In this system heat is transferred to the evaporator and the generator from the waste hot water of a textile factory at the same time. The rejected heat from the absorber provides the thermal energy demanded by the desalination system. Superheated water vapor which works as refrigerant comes out from the generator and enters to the condenser where it is condensed as saturated liquid. One part of the condensed refrigerant is pumped to the higher pressure level of the evaporator (P1). In the evaporator, water is heated to saturated vapor phase with the same waste heat provided to the generator. This vapor is absorbed in the first absorber/evaporator by the strong solution of LiBr/H2O coming back from the generator. One portion of the released heat in the absorber is used to retain the absorber-evaporator-1 at a temperature higher than that of the evaporator. The second split of the condensed refrigerant leaving the condenser is pumped to the pressure level of P2 which is higher than that of P1 and provides heat to the saturated vapor by utilizing the heat of the absorption preserved by AB/EV1. This vapor is then absorbed in AB/EV2 by the strong LiBr/H2O solution flowing from the generator. Some parts of the absorption heat are used to maintain the AB/EV2 at a temperature higher than that of AB/EV1. The final split of the condensed refrigerant is pumped to the highest pressure level (P3) and consequently the water is heated in AB/EV2 to saturated vapor by the retained heat in the AB/EV2. Finally this saturated vapor is absorbed by the strong absorbent-refrigerant coming back from generator and the exothermic reaction in the absorber makes the temperature approximately (30–60°C [27]) hotter than that of the temperature of the AB/EV2. The residual part of the released heat is transferred to impure water as latent and sensible heat in desalination system as shown in Figure 2. The weak solutions coming back from the absorber and AB/EV2 are divided into two parts. One part of each is directly returned to generator and used in heat recovery part of the first and second heat exchanger. The second fractions of the weak solution are combined together in order to be used in heat recovery part of the third heat exchanger.


Thermodynamic analysis and optimization of a high temperature triple absorption heat transformer.

Khamooshi M, Parham K, Yari M, Egelioglu F, Salati H, Babadi S - ScientificWorldJournal (2014)

Schematic diagram of a triple absorption heat transformer.
© Copyright Policy - open-access
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4127287&req=5

fig2: Schematic diagram of a triple absorption heat transformer.
Mentions: Figure 2 displays the modified configuration of the triple absorption heat transformer. This cycle mainly consists of a generator, a condenser, an evaporator, an absorber, two absorber/evaporators, and three economizers. In this system heat is transferred to the evaporator and the generator from the waste hot water of a textile factory at the same time. The rejected heat from the absorber provides the thermal energy demanded by the desalination system. Superheated water vapor which works as refrigerant comes out from the generator and enters to the condenser where it is condensed as saturated liquid. One part of the condensed refrigerant is pumped to the higher pressure level of the evaporator (P1). In the evaporator, water is heated to saturated vapor phase with the same waste heat provided to the generator. This vapor is absorbed in the first absorber/evaporator by the strong solution of LiBr/H2O coming back from the generator. One portion of the released heat in the absorber is used to retain the absorber-evaporator-1 at a temperature higher than that of the evaporator. The second split of the condensed refrigerant leaving the condenser is pumped to the pressure level of P2 which is higher than that of P1 and provides heat to the saturated vapor by utilizing the heat of the absorption preserved by AB/EV1. This vapor is then absorbed in AB/EV2 by the strong LiBr/H2O solution flowing from the generator. Some parts of the absorption heat are used to maintain the AB/EV2 at a temperature higher than that of AB/EV1. The final split of the condensed refrigerant is pumped to the highest pressure level (P3) and consequently the water is heated in AB/EV2 to saturated vapor by the retained heat in the AB/EV2. Finally this saturated vapor is absorbed by the strong absorbent-refrigerant coming back from generator and the exothermic reaction in the absorber makes the temperature approximately (30–60°C [27]) hotter than that of the temperature of the AB/EV2. The residual part of the released heat is transferred to impure water as latent and sensible heat in desalination system as shown in Figure 2. The weak solutions coming back from the absorber and AB/EV2 are divided into two parts. One part of each is directly returned to generator and used in heat recovery part of the first and second heat exchanger. The second fractions of the weak solution are combined together in order to be used in heat recovery part of the third heat exchanger.

Bottom Line: First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair.A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters.The optimization results showed that the COP of 0.2491 is reachable by the proposed cycle.

View Article: PubMed Central - PubMed

Affiliation: Department of Mechanical Engineering, Eastern Mediterranean University, G. Magosa, North Cyprus, Mersin 10, Turkey.

ABSTRACT
First law of thermodynamics has been used to analyze and optimize inclusively the performance of a triple absorption heat transformer operating with LiBr/H2O as the working pair. A thermodynamic model was developed in EES (engineering equation solver) to estimate the performance of the system in terms of the most essential parameters. The assumed parameters are the temperature of the main components, weak and strong solutions, economizers' efficiencies, and bypass ratios. The whole cycle is optimized by EES software from the viewpoint of maximizing the COP via applying the direct search method. The optimization results showed that the COP of 0.2491 is reachable by the proposed cycle.

Show MeSH
Related in: MedlinePlus