Development of near-optimal advanced control sequences for chiller plants with water-side economizers in U.S. Climates (ASHRAE RP-1661)

Faulkner, Cary A.; Ho, Julia; Shi, Chengnan; Fan, Chengliang; Ildiri, Nasim; Zuo, Wangda

doi:10.1080/23744731.2024.2404814

Development of near-optimal advanced control sequences for chiller plants with water-side economizers in U.S. Climates (ASHRAE RP-1661)

Journal Article · Wed Oct 23 00:00:00 EDT 2024 · Science and Technology for the Built Environment

DOI:https://doi.org/10.1080/23744731.2024.2404814· OSTI ID:2564389

Faulkner, Cary A. ^[1]; Ho, Julia ^[2]; Shi, Chengnan ^[1]; Fan, Chengliang ^[1]; Ildiri, Nasim ^[1]; Zuo, Wangda ^[3]

University of Colorado, Boulder, CO (United States)
Pennsylvania State University, University Park, PA (United States)
Pennsylvania State University, University Park, PA (United States); National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Various advanced control sequences for chiller plants with water-side economizers (WSE) have been proposed in literature, but the evaluation and optimization of those controls is limited. It is possible to maximize energy savings by selecting different sequences and related parameters based on the plant configuration, load, and climate. This paper addresses this gap by developing near-optimal advanced control sequences for chiller plants with WSEs. First, advanced control sequences for chiller plants with WSEs are categorized into condenser water, chilled water, and hybrid controls and representative sequences from each category are identified. Next, 504 different scenarios are optimized. These scenarios represent all possible combinations of two plant configurations, a constant or variable load profile, three advanced control sequences, and seven optimization parameter combinations in six climate zones. The results show the recommended near-optimal sequences can reduce energy consumption by up to 15% relative to the baseline depending on the configuration, load profile, and climate. Specifically, the CW-CHW sequence is recommended for the majority of systems because it is often the most energy efficient and/or reduces the runtime of chillers. The methodology in this paper provides practical guidance for achieving energy savings through near-optimal control of chiller plants with WSEs.

View Accepted Manuscript (DOE)

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC36-08GO28308

OSTI ID:: 2564389

Report Number(s):: NREL/JA--5500-94684; MainId:96466; UUID:12f5e786-b964-4dd9-95d3-92d18d375eff; MainAdminId:76800

Journal Information:: Science and Technology for the Built Environment, Journal Name: Science and Technology for the Built Environment Journal Issue: 1 Vol. 31; ISSN 2374-4731

Publisher:: Taylor & FrancisCopyright Statement

Country of Publication:: United States

Language:: English

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