The development and calibration of a generic dynamic absorption chiller model

Simon Paul Borg, Nicolas Kelly

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Although absorption cooling has been available for many years, the technology has typically been viewed as a poorly performing alternative to vapour compression refrigeration. Rising energy prices and the requirement to improve energy efficiency is however driving renewed interest in the technology, particularly within the context of combined cooling, heat and power systems (CCHP) for buildings. In order to understand the performance of absorption cooling, numerous models are available in the literature. However, the complexities involved in the thermodynamics of absorption chillers have so far restricted researchers to creating steady state or dynamic models reliant on data measurements of the internal chiller state, which require difficult-to-obtain, intrusive measurements. The pragmatic, yet fully-dynamic model described in this paper is designed to be easily calibrated using data obtained from the measurements of inflows and outflows to a chiller, without resorting to
intrusive measurements. The model comprises a series of linked control volumes featuring both performance maps and lumped mass volumes, which reflect the underlying physical structure of the device. The model was developed for the ESP-r building simulation tool. This paper describes the modelling approach, theory and limitations, along with its calibration and the application of the model
to a specific example.
LanguageEnglish
Pages533-544
Number of pages12
JournalEnergy and Buildings
Volume55
DOIs
Publication statusPublished - Dec 2012

Fingerprint

Calibration
Absorption
Absorption cooling
Cooling
Dynamic models
Dynamic Model
Vapor compression refrigeration
Control Volume
Simulation Tool
Energy Efficiency
Model
Power System
Energy efficiency
Thermodynamics
Compression
Heat
Internal
Series
Alternatives
Requirements

Keywords

  • building simulation model
  • calibration modeling
  • absorption cooling
  • ESP-r

Cite this

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The development and calibration of a generic dynamic absorption chiller model. / Borg, Simon Paul; Kelly, Nicolas.

In: Energy and Buildings, Vol. 55, 12.2012, p. 533-544.

Research output: Contribution to journalArticle

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AU - Kelly, Nicolas

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AB - Although absorption cooling has been available for many years, the technology has typically been viewed as a poorly performing alternative to vapour compression refrigeration. Rising energy prices and the requirement to improve energy efficiency is however driving renewed interest in the technology, particularly within the context of combined cooling, heat and power systems (CCHP) for buildings. In order to understand the performance of absorption cooling, numerous models are available in the literature. However, the complexities involved in the thermodynamics of absorption chillers have so far restricted researchers to creating steady state or dynamic models reliant on data measurements of the internal chiller state, which require difficult-to-obtain, intrusive measurements. The pragmatic, yet fully-dynamic model described in this paper is designed to be easily calibrated using data obtained from the measurements of inflows and outflows to a chiller, without resorting tointrusive measurements. The model comprises a series of linked control volumes featuring both performance maps and lumped mass volumes, which reflect the underlying physical structure of the device. The model was developed for the ESP-r building simulation tool. This paper describes the modelling approach, theory and limitations, along with its calibration and the application of the modelto a specific example.

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