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Research Papers: Energy Systems Analysis

EnergyPlus Integration Into Cosimulation Environment to Improve Home Energy Saving Through Cyber-Physical Systems Development

[+] Author and Article Information
Joe Singer, Chenli Wang

Department of Mechanical Engineering,
Santa Clara University,
Santa Clara, CA 95053

Thomas Roth, Cuong Nguyen

National Institute of Standards and Technology,
Gaithersburg, MD 20899

Hohyun Lee

Department of Mechanical Engineering,
Santa Clara University,
Santa Clara, CA 95053
e-mail: hlee@scu.edu

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 22, 2018; final manuscript received December 5, 2018; published online January 9, 2019. Assoc. Editor: Omid Askari.

J. Energy Resour. Technol 141(6), 062001 (Jan 09, 2019) (5 pages) Paper No: JERT-18-1645; doi: 10.1115/1.4042224 History: Received August 22, 2018; Revised December 05, 2018

This paper presents a co-simulation platform which combines a building simulation tool with a cyber-physical systems (CPS) approach. Residential buildings have a great potential of energy reduction by controlling home equipment based on usage information. A CPS can eliminate unnecessary energy usage on a small, local scale by autonomously optimizing equipment activity, based on sensor measurements from the home. It can also allow peak shaving from the grid if a collection of homes are connected. However, lack of verification tools limits effective development of CPS products. The present work integrates EnergyPlus, which is a widely adopted building simulation tool, into an open-source development environment for CPS released by the National Institute of Standards and Technology (NIST). The NIST environment utilizes the IEEE high-level architecture (HLA) standard for data exchange and logical timing control to integrate a suite of simulators into a common platform. A simple CPS model, which controls local heating, ventilation, and cooling (HVAC) temperature set-point based on environmental conditions, was tested with the developed co-simulation platform. The proposed platform can be expanded to integrate various simulation tools and various home simulations, thereby allowing for cosimulation of more intricate building energy systems.

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Figures

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Fig. 1

EnergyPlus has capability to interface with an FMU. Using TCP/IP socket communication inside a generic FMU allows for connectivity to a UCEF Java federate for the HLA RTI data exchange.

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Fig. 2

EnergyPlus as a master program for the FMI standard calls select functions throughout simulation to perform specific tasks. At each time-step, three functions are called to transfer EnergyPlus data to an FMU.

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Fig. 3

Unified modeling language diagram representing data communication between the master EnergyPlus program and a UCEF Java federate via FMU slave instance

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Fig. 4

Representation of the data transfer using run time infrastructure between the EnergyPlus Java federate and the thermostat controller Java federate

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Fig. 5

Simulation results of temperature fluctuation controlled by constant heating and cooling set-points input

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Fig. 6

Heating and cooling power consumptions respective to HVAC operation controlled by constant set-points (Fig. 5)

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Fig. 7

Heating, ventilation, and cooling heating and cooling set-points based on external intelligent thermostat controller. Direct connection based and RTI connection yield consistent results.

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Fig. 8

Heating, ventilation, and cooling monthly energy consumption of two simulation, constant set-point thermostat and intelligent thermostat controller

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