HEAT EXCHANGER NETWORK RETROFITTING

Ph.DDOCTOR OF PHILOSOPH

Pilot studies on optimizing land use, building density and solar electricity generation in dense urban settings

[EN] Previous studies have identified links between the urban form and the performance of urban energy systems. Land use and density are two important aspects of urban planning and design. This paper studies the relationship between these aspects and the performance of an urban energy system. For this, the study compares different metrics of land use, density, and energy performance. These metrics are floor area ratio, density gradient, land use ratio, renewable energy share, and the peak electricity import from the city grid. The approach is based on the multi-objective optimization of the urban form. The results offer what-if scenarios on how land-use and density can either maximize the performance of an urban energy system.Shi, Z.; Hsieh, S.; Sreepathi, BK.; Fonseca, J.; Maréchal, F.; Schlueter, A. (2018). Pilot studies on optimizing land use, building density and solar electricity generation in dense urban settings. En 24th ISUF International Conference. Book of Papers. Editorial Universitat Politècnica de València. 641-648. https://doi.org/10.4995/ISUF2017.2017.5636OCS64164

Retrofitting of heat exchanger networks involving streams with variable heat capacity: Application of single and multi-objective optimization

10.1016/j.applthermaleng.2014.09.067Applied Thermal Engineering75677-68

A framework for agile optimization of district energy systems

This paper presents an approach to tackle output uncertainty in District Energy Systems’ performance for variable time horizons and progressive changes in urbanization processes and energy policy, which we define as agile optimization of District Energy Systems (DES). Multi-objective optimization of DES provides non-dominated tradeoff solutions among conflicting objectives in the form of a Pareto-front. A single solution needs to be chosen from the Pareto-front to proceed further in the urban design process. To facilitate this, an uncertainty analysis is performed on the parameters corresponding to equipment lifetime and operational costs of DES. The method is tested on an existing neighborhood with 24 buildings in the city of Zug. The energy systems configuration of the neighborhood was optimized and uncertainty analysis was performed on the Pareto-front to identify the most reliable system configuration. The final solution chosen, has the highest frequency (30.8%) of being the most stable solution. It also has the highest probability (96%) of being below the Cutoff point of Total Annualized Costs.ISSN:1876-610

Review of Heat Exchanger Network Retrofitting Methodologies and Their Applications

Heat exchanger network (HEN) retrofitting improves heat recovery and thus reduces energy required in existing plants. This can be achieved by either increasing the heat transfer area and/or using heat transfer enhancements to increase heat transfer coefficients. There is an increasing interest in HEN retrofitting as can be seen from 20 journal papers since 2009 (about 5 years) compared to 15 in the 10-year period 1999–2008. In total, there are about 60 journal papers on HEN retrofitting since the year 1985; however, in the past 20 years, there has been no review paper summarizing HEN retrofitting methodologies and their applications. This provides the motivation for this review paper. HEN retrofitting methods can be classified into three broad categories, namely, mathematical programming based methods, pinch analysis based methods, and hybrid methods according to their underlying approach. Further, some HEN retrofitting methods include pressure drop considerations, and HEN retrofitting can be using heat transfer enhancements. This paper reviews all these methods and their applications in each of these categories. Finally, it discusses alternate solutions of five application problems solved by several methods/researchers and/or for different objectives. Review of HEN retrofitting methods and their applications presented in this paper will be useful to both researchers and practitioners

architecture-building-systems/CEAforArcGIS: Pre-release 2.2a4 including the installer for planner edition (DO NOT CITE)

This pre-release of the 2.2 version contains the state of master on 2017-04-19 08:33 (UTC) Features include: work on an installer for the planner edition (installs addin for ArcGIS Desktop 10.4

architecture-building-systems/CityEnergyAnalyst: CityEnergyAnalyst v.3.34.2

Enhanced zone helper to store street address [v3.34.2] 19 September 2023, in Zurich & Singapore zone_helper now saves the street addresses and postal codes of the buildings fetched from OpenStreetMap. The enhanced zone_helper also stores house names and residential types (for Singapore HDB Buildings only). The CEA Team # What's Changed Release 3.34.1 by @shizhongming in https://github.com/architecture-building-systems/CityEnergyAnalyst/pull/3380 Update sg_energy_optimization.yml by @shizhongming in https://github.com/architecture-building-systems/CityEnergyAnalyst/pull/3381 correcting typos by @shizhongming in https://github.com/architecture-building-systems/CityEnergyAnalyst/pull/3382 Saving additional info zone helper by @shizhongming in https://github.com/architecture-building-systems/CityEnergyAnalyst/pull/3388 Full Changelog: https://github.com/architecture-building-systems/CityEnergyAnalyst/compare/v.3.34.1...v3.34.