Waste heat recovery of power plant with large scale serial absorption heat pumps

Xu, Z.Y.; Mao, H.C.; Liu, D.S.; Wang, R.Z.

doi:10.1016/j.energy.2018.10.052

Cited by 88 publications

(19 citation statements)

References 29 publications

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“…[ 36 ]. In addition, the constructions of model B for the three-terminal heat pump and the three-terminal heat pump are accordant with the practical thermally driven heat pump [ 39 , 40 , 41 ] and thermally driven heat transformer [ 42 , 43 ]. More specifically, for a practical absorption heat pump, the low-grade thermal energy source with high temperature releases heat into the generator; the heated space with intermediate temperature absorbs heat from two components, namely, the condenser and absorber; the evaporator absorbs heat from environment.…”

Section: Resultsmentioning

confidence: 99%

“…Attending the above comments, it is natural to ask: How to evaluate and compare the performances of the low-dissipation three-terminal thermodynamic devices with different combined constructions; whether the optimal combined constructions of those three-terminal thermodynamic devices based on low-dissipation assumption are consistent with Refs. [ 36 , 37 , 38 ]; whether the optimal combined constructions in accordance with practical thermally driven heat pump [ 39 , 40 , 41 ] and thermal driven heat transformer can be deduced [ 42 , 43 ] within the frame of low-dissipation assumption? To find out the answers to the above questions will further reveal the compatibility between the low-dissipation model and endoreversible model for multi-terminal thermodynamic devices and clarify the validity of the application of low-dissipation model for multi-terminal thermodynamic devices, which is the main objective of the present paper.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Assessment of Various Low-Dissipation Combined Models for Three-Terminal Heat Pump Systems

Cao

Yang

et al. 2021

Entropy

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Thermally driven heat pump systems play important roles in the utilization of low-grade thermal energy. In order to evaluate and compare the performances of three different constructions of thermally driven heat pump and heat transformer, the low-dissipation assumption has been adopted to establish the irreversible thermodynamic models of them in the present paper. By means of the proposed models, the heating loads, the coefficients of performance (COPs) and the optimal relations between them for various constructions are derived and discussed. The performances of different constructions are numerically assessed. More importantly, according to the results obtained, the upper and lower bounds of the COP at maximum heating load for different constructions are generated and compared by the introduction of a parameter measuring the deviation from the reversible limit of the system. Accordingly, the optimal constructions for the low-dissipation three-terminal heat pump and heat transformer are determined within the frame of low-dissipation assumption, respectively. The optimal constructions in accord with previous research and engineering practices for various three-terminal devices are obtained, which confirms the compatibility between the low-dissipation model and endoreversible model and highlights the validity of the application of low-dissipation model for multi-terminal thermodynamic devices. The proposed models and the significant results obtained enrich the theoretical thermodynamic model of thermally driven heat pump systems and may provide some useful guidelines for the design and operation of realistic thermally driven heat pump systems.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative Assessment of Various Low-Dissipation Combined Models for Three-Terminal Heat Pump Systems

Cao

Yang

et al. 2021

Entropy

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“…Various feasible low-grade heat harvesting technologies, such as organic Rankine cycle [2], thermoelectric devices [3], and electrochemical system [4], have emerged successively. Among all, a class of thermally driven heat pumps, mainly including absorption [5], adsorption [6], and ejector [7] heat pumps, are nowadays some of the most competitive and promising due to their low capital cost, low noise, high reliabilities, and wide adaptability to various low-grade heat sources with different temperatures and become a hot research topic. The influences of working pairs on the performance of absorption [8] and adsorption [6] heat pumps are investigated.…”

Section: Introductionmentioning

confidence: 99%

The equivalent low-dissipation combined cycle system and optimal analyses of a class of thermally driven heat pumps

Guo

Yang

González-Ayala

et al. 2020

Energy Conversion and Management

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The performance characteristics, operation, and design strategies of a class of thermally driven heat pumps are investigated due to their important roles in the efficient utilization of low-grade thermal energy. In order to establish a more generic thermodynamic model of thermally driven heat pumps mainly including absorption, adsorption, and ejector heat pumps, low-dissipation assumption is adopted. Accordingly, the associated dissipation parameters accounting for the specific information on the irreversibilities in each heat-transfer process are introduced rather than specifying heat-transfer law. Based on the proposed model, the theoretical results of the coefficient of performance and heat load are derived with regard to two key parameters denoting the size ratio of the two involved subsystems and the matching deviation from reversible limit. The performance characteristics and the optimally operating regions of the whole system are determined and the differences between thermally driven heat pump and refrigerator are highlighted. The proposed model and obtained results further develop the low-dissipation model and may provide a useful description for the operation and design of practical thermally driven heat pumps.

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“…Some studies focus on the reuse of exhaust gases for co-generation [2] and the use of this energy for pre-drying in coal power plants, which increases the thermal efficiency of the system by approximately 2% [3]. Other studies have focused on heat pump absorption technology with up to 32% energy savings within the system [4]. Zhang et al [5] used a vapor-pump equipped gas boiler for flue gas heat recovery with system efficiency over 10%.…”

Section: Introductionmentioning

confidence: 99%

Waste Heat and Water Recovery System Optimization for Flue Gas in Thermal Power Plants

et al. 2019

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Fossil-fueled power plants present a problem of significant water consumption, carbon dioxide emissions, and environmental pollution. Several techniques have been developed to utilize flue gas, which can help solve these problems. Among these, the ones focusing on energy extraction beyond the dew point of the moisture present within the flue gas are quite attractive. In this study, a novel waste heat and water recovery system (WHWRS) composed of an organic Rankine cycle (ORC) and cooling cycles using singular working fluid accompanied by phase change was proposed and optimized for maximum power output. Furthermore, WHWRS configurations were analyzed for fixed water yield and fixed ambient temperature, covering possible trade-off scenarios between power loss and the number of stages as per desired yields of water recovery at ambient temperatures in a practical range. For a 600 MW power plant with 16% water vapor volume in flue gas at 150 °C, the WHWRS can produce 4–6 MWe while recovering 50% water by cooling the flue gas to 40 °C at an ambient temperature of 20 °C. Pragmatic results and design flexibility, while utilizing single working fluid, makes this proposed system a desirable candidate for practical application.

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Waste heat recovery of power plant with large scale serial absorption heat pumps

Cited by 88 publications

References 29 publications

Comparative Assessment of Various Low-Dissipation Combined Models for Three-Terminal Heat Pump Systems

Comparative Assessment of Various Low-Dissipation Combined Models for Three-Terminal Heat Pump Systems

The equivalent low-dissipation combined cycle system and optimal analyses of a class of thermally driven heat pumps

Waste Heat and Water Recovery System Optimization for Flue Gas in Thermal Power Plants

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