Method of linear approximation of COP for heat pumps and chillers based on thermodynamic modelling and off-design operation

Pieper, Henrik; Krupenski, Igor; Markussen, Wiebke Brix; Ommen, Torben Schmidt; Siirde, Andres; Volkova, Anna

doi:10.1016/j.energy.2021.120743

Cited by 21 publications

(8 citation statements)

References 45 publications

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“…The opening ceremony has always been the highlight of the games, and the group gymnastics performance is the most important form of performance in the opening ceremonies of the major games, especially the group gymnastics performance of the Olympic Games Clever Curtain Ceremony [11]. It can fully demonstrate to the world the comprehensive national strength of a country and nation, as well as the degree of material civilization and spiritual civilization [12].…”

Section: The Concept Of Group Gymnasticsmentioning

confidence: 99%

Design and research of group gymnastics formation and pattern change and animation simulation method based on wireless network communication

Xu¹

2023

Preprint

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Group gymnastics performance is an essential part of the opening ceremony of large-scale games. It can not only show the cultural heritage and scientific and technological achievements of a country and a nation, but also show their rich imagination and economic strength. The development of group gymnastics has injected new vitality into the progress of human civilization. As a social and cultural activity, it can not only make the audience feel the long history and culture of human beings, but also allow the audience to enjoy the visual beauty and make the audience feel refreshed. The research on the theory and training methods of group gymnastics formation and pattern change is an important link to speed up the faster and better development of group gymnastics. This paper studies the formation and pattern change methods of large-scale group gymnastics performances and the animation simulation method, classifies group gymnastics formations and patterns, and tries to apply wireless network communication technology to the training of group gymnastics formation and pattern changes. Provide an intuitive and easy-to-understand training method for group gymnastics training, so as to achieve the purpose of improving the efficiency of group gymnastics formation and pattern change training.

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Section: The Concept Of Group Gymnasticsmentioning

confidence: 99%

Design and research of group gymnastics formation and pattern change and animation simulation method based on wireless network communication

Xu¹

2023

Preprint

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“…COP is the common performance factor for chillers. Similar to the COP of heat pumps, the COP of chillers also can be modeled as a constant [136], a linear function of system states [137,138], a function of the part load ratio [139], a bi-quadratic function [80], polynomials [80] or an exponential function [79].…”

Section: Chillermentioning

confidence: 99%

“…Six black-box models based on water-side data for CCs were compared in [80], showing that the bi-quadratic model and polynomial model had a better performance. An accurate linear COP approximation method of chillers was proposed in [137]: the inputs include the inlet and outlet water temperatures, source and sink temperatures and the cooling load. To avoid a large number of inputs that need extra measurements, COP models based on part load ratios are adopted in this work.…”

Section: Chillermentioning

confidence: 99%

A Review of Mathematical Models of Building Physics and Energy Technologies for Environmentally Friendly Integrated Energy Management Systems

2022

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The Energy Management System (EMS) is an efficient technique to monitor, control and enhance the building performance. In the state-of-the-art, building performance analysis is separated into building simulation and control management: this may cause inaccuracies and extra operating time. Thus, a coherent framework to integrate building physics with various energy technologies and energy control management methods is highly required. This framework should be formed by simplified but accurate models of building physics and building energy technologies, and should allow for the selection of proper control strategies according to the control objectives and scenarios. Therefore, this paper reviews the fundamental mathematical modeling and control strategies to create such a framework. The mathematical models of (i) building physics and (ii) popular building energy technologies (renewable energy systems, common heating and cooling energy systems and energy distribution systems) are first presented. Then, it is shown how the collected mathematical models can be linked. Merging with two frequently used EMS strategies, namely rule-based and model predictive controls, is discussed. This work provides an extendable map to model and control buildings and intends to be a foundation for building researchers, designers and engineers.

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“…COP) at different part load ratio (PLR) [ 24 ]. For the multi-chiller system set with different capacity, the optimal strategy is more complex, as the chiller sequencing control is based on matching optimal chiller cooling capacity and the optimal cooling load [ 25 ]. Currently, the chiller operation methods in hub airport terminals mainly include three strategies, i.e., optimal cooling load control, optimal sequencing control and optimal COP control [ [26] , [27] , [28] ].…”

Section: Operation Control Strategies For Hub Airport Terminalsmentioning

confidence: 99%

Strategical district cooling system operation in hub airport terminals, a research focusing on COVID-19 pandemic impact

Yan

Yang²,

He³

et al. 2022

Energy

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Method of linear approximation of COP for heat pumps and chillers based on thermodynamic modelling and off-design operation

Cited by 21 publications

References 45 publications

Design and research of group gymnastics formation and pattern change and animation simulation method based on wireless network communication

Design and research of group gymnastics formation and pattern change and animation simulation method based on wireless network communication

A Review of Mathematical Models of Building Physics and Energy Technologies for Environmentally Friendly Integrated Energy Management Systems

Strategical district cooling system operation in hub airport terminals, a research focusing on COVID-19 pandemic impact

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