Degree Type

Dissertation

Date of Award

2018

Degree Name

Doctor of Philosophy

Department

Mechanical Engineering

Major

Mechanical Engineering

First Advisor

Atul Kelkar

Abstract

Building energy sector is one of the important sources of energy consumption and especially

in the United States, it accounts for approximately 40% of the total energy consumption.

Besides energy consumption, it also contributes to CO2 emissions due to the combustion of

fossil fuels for building operation. Preventive measures have to be taken in order to limit the

greenhouse gas emission and meet the increasing load demand, energy efficiency and savings

have been the primary objective globally. Heating, Ventilation, and air-conditioning (HVAC)

system is a major source of energy consumption in buildings and is the principal building system

of interest. These energy systems comprising of many subsystems with local information

and heterogeneous preferences demand the need for coordination in order to perform optimally.

The performance required by a typical airside HVAC system involving a large number of zones

are multifaceted, involves attainment of various objectives (such as optimal supply air temperature)

which requires coordination among zones. The required performance demands the need

for accurate models (especially zones), control design at the individual (local-VAV (Variable Air

Volume)) subsystems and a supervisory control (AHU (Air Handling Unit) level) to coordinate

the individual controllers.

In this thesis, an airside HVAC system is studied and the following considerations are addressed:

a) A comparative evaluation among representative methods of different classes of

models, such as physics-based (e.g., lumped parameter autoregressive models using simple

physical relationships), data-driven (e.g., artificial neural networks, Gaussian processes) and

hybrid (e.g., semi-parametric) methods for different physical zone locations; b) A framework

for control of building HVAC systems using a methodology based on power shaping paradigm

that exploits the passivity property of a system. The system dynamics are expressed in the

Brayton-Moser (BM) form which exhibits a gradient structure with the mixed-potential function,

which has the units of power. The power shaping technique is used to synthesize the controller by assigning a desired power function to the closed loop dynamics so as to make the equilibrium point asymptotically stable, and c) The BM framework and the passivity tool are

further utilized for stability analysis of constrained optimization dynamics using the compositional

property of passivity, illustrated with energy management problem in buildings. Also,

distributed optimization (such as subgradient) techniques are used to generate the optimal setpoints

for the individual local controllers and this framework is realized on a distributed control

platform VOLTTRON, developed by the Pacific Northwest National Laboratory (PNNL).

DOI

https://doi.org/10.31274/etd-180810-5960

Copyright Owner

Venkatesh Chinde

Language

en

File Format

application/pdf

File Size

142 pages

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