Performance Monitoring of Chilled-Water Distribution Systems Using HVAC-Cx
ASHRAE TRANSACTIONS 2017, VOL 123, PT 2
Authors: Ferretti, Natascha Milesi; Galler, Michael A.; Bushby, Steven T.
Abstract
In this research we develop, test, and demonstrate the newest extension of the software HVAC-Cx (NIST and CSTB 2014), an automated commissioning tool for detecting common mechanical faults and control errors in chilled-water distribution systems (loops). The commissioning process can improve occupant comfort, ensure the persistence of correct system operation, and reduce energy consumption. Automated tools support the process by decreasing the time and the skill level required to carry out necessary quality assurance measures, and as a result they enable more thorough testing of building heating, ventilating, and air-conditioning (HVAC) systems. This paper describes the algorithm, developed by National Institute of Standards and Technology (NIST), to analyze chilled-water loops and presents the results of a passive monitoring investigation using field data obtained from BACnet (R) (ASHRAE 2016) controllers and presents field validation of the findings. The tool was successful in detecting faults in system operation in its first field implementation supporting the investigation phase through performance monitoring. Its findings led to a full energy retrocommissioning of the field site.
A COMMON METRICS AND SET OF INDICATORS FOR ASSESSING BUILDINGS AND URBAN FABRIC SUSTAINABILITY PERFORMANCE
CESB 10: CENTRAL EUROPE TOWARDS SUSTAINABLE BUILDING - FROM THEORY TO PRACTICE
Authors: Salat, Serge; Vialan, Daphne; Nowacki, Caroline
Abstract
A global sustainability assessment method must take into account the urban dimension and not only the single building itself. The Urban Morphology Lab of CSTB (The French Centre for Building Science) has shown that urban morphology has an impact on energy performance of the order 2. The paper will present a common metrics, which links the scales of buildings, urban blocks and neighborhoods for an assessment of energy efficiency of the whole urban fabric including buildings and spaces between buildings such as street canyons.. The derivation of this metrics into a set of performance indicators is currently developed in the framework of the iiSBE Urban Working group chaired by the author.