Absorption heat converter and the characteristic equation method.

Cudok, Falk; Ziegler, Felix

doi:10.18462/iir.icr.2015.0764

Cited by 2 publications

(2 citation statements)

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“…To obtain the performance of an absorption chiller, (Hellmann H. M., Schweigler C., & Ziegler F, 1999) proposes a method where the cooling capacity and COP are related by linear algebraic expressions with the temperatures of the external fluids of the absorption chillers. The authors (Cudok & Ziegler, 2015), (Kühn, Meyer, & Ziegler, 2008), (Puig-Arnavat, Lopez-Villada, Bruno, & Coronas, 2010), propose a series of expressions similar to the characteristic equation but obtained with a multiple linear regression with experimental data from the chillers. The authors (Lecuona, Ventas, Venegas, Zacarias, & Salgado, 2008), calculate the optimum operation temperature of solar cooling systems by means of the characteristic equation, where the cooling capacity and the COP of the chiller are expressed as functions of the temperatures of the external fluid that exchanges heat with the solution and the refrigerant, using the so-called characteristic temperature difference (ΔΔt), finally the obtained characteristic equation predicts the partial load behavior of the modelled absorption chillers and avoids the need to perform extensive numerical simulations of the internal thermodynamic cycle.…”

Section: Characteristic Of Equation Methodsmentioning

confidence: 99%

Comparison models of the operation of absorption machines using the characteristic equation

Alvarado,

Carmona,

Palmeth

et al. 2024

OLEL

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The integration of absorption machines in micro-trigeneration systems based on micro gas turbines is one of the most viable options for the use of waste gases from micro-turbines, increasing the energy efficiency of the systems, for which the analytical model proposed by the authors is used (Malinowski & Lewandowska, 2013) and (Wang, Cai, & Zhang, 2004), which was reproduced, tested, modified and extended to gas micro-turbines with different power ratings but of the same type, this model is used to heat the activation fluids of the absorption chillers used in these systems, directly influencing the behavior of the chillers according to the load and operating conditions of the micro-turbines, This makes it necessary to develop and apply models of the absorption chillers, with the aim of analyzing the degree of influence that micro-turbines operating at partial load have on the absorption chillers. For this reason, the model selected to obtain the performance of the chillers must be a simple model capable of predicting the behavior of the chillers based on the information from the external currents of the chillers. In the literature, there are a large number of studies focused on the development of absorption chiller models with experimental validation, which take into account specific characteristics of the machine with a greater or lesser degree of detail; this type of model and the literature review.

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Section: Characteristic Of Equation Methodsmentioning

confidence: 99%

Comparison models of the operation of absorption machines using the characteristic equation

Alvarado,

Carmona,

Palmeth

et al. 2024

OLEL

View full text Add to dashboard Cite

show abstract

“…Absorption technologies offer services depending on their application. Absorption chillers (AC) produce thermally generated cold, while absorption heat pumps (AHP) and absorption heat transformers [14] (AHT) provide useful heat at different temperature levels. Additionally, absorption heat exchangers (AHX) can shift temperature levels and differences for an energy stream.…”

Section: Absorption Heat Pump Technology For District Heatingmentioning

confidence: 99%

AbSolut - Integration of Absorption Technologies in District Heating and Cooling Systems for Enhanced Economic and Ecological Impact

Seidnitzer-Gallien,

Ribas-Tugores,

Zotter

2024

Int Sustain Ener Conf Proc

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District heating (DH) systems play a crucial role in meeting heating demands across the European Union (EU) and Austria, with significant potential for energy efficiency improvements and decarbonization. However, the transition towards climate neutrality by 2040 poses significant challenges, particularly in decarbonizing existing DH systems and integrating renewable energy sources. This work explores the application of absorption technologies, specifically absorption heat exchangers (AHX), absorption chillers (AC), and absorption heat pumps (AHP), in optimizing DH systems. The study investigates the utilization of AHX as transfer substations to increase heat capacity within existing grids by up to 30%, facilitating the integration of renewables and reducing distribution heat losses. Additionally, AC implementation for cooling supply demonstrates efficiency improvements through dynamic operation modes, renewable energy integration, and reduced electricity demand. Furthermore, AHP for waste heat utilization in DH power plants showcases environmental benefits, cost savings, and enhanced energy security. Through detailed techno-economic analyses and case studies, the paper evaluates the viability and economic feasibility of absorption technologies in DH applications. Challenges such as system integration, spatial requirements, and driving energy optimization are addressed, offering insights into overcoming barriers to adoption. Overall, the research highlights the transformative potential of absorption technologies in enhancing the efficiency, sustainability, and resilience of DH systems. By leveraging these technologies, DH operators and stakeholders can navigate the transition towards climate neutrality, while ensuring reliable and cost-effective heating and cooling solutions for urban areas.

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Absorption heat converter and the characteristic equation method.

Cited by 2 publications

References 0 publications

Comparison models of the operation of absorption machines using the characteristic equation

Comparison models of the operation of absorption machines using the characteristic equation

AbSolut - Integration of Absorption Technologies in District Heating and Cooling Systems for Enhanced Economic and Ecological Impact

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