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Title: Model calibration of a variable refrigerant flow system with a dedicated outdoor air system: A case study

Abstract

With increased use of variable refrigerant flow (VRF) systems in the U.S. building sector, interests in capability and rationality of various building energy modeling tools to simulate VRF systems are rising. This paper presents the detailed procedures for model calibration of a VRF system with a dedicated outdoor air system (DOAS) by comparing to detailed measured data from an occupancy emulated small office building. The building energy model is first developed based on as-built drawings, and building and system characteristics available. The whole building energy modeling tool used for the study is U.S. DOE’s EnergyPlus version 8.1. The initial model is, then, calibrated with the hourly measured data from the target building and VRF-DOAS system. In a detailed calibration procedures of the VRF-DOAS, the original EnergyPlus source code is modified to enable the modeling of the specific VRF-DOAS installed in the building. After a proper calibration during cooling and heating seasons, the VRF-DOAS model can reasonably predict the performance of the actual VRF-DOAS system based on the criteria from ASHRAE Guideline 14-2014. The calibration results show that hourly CV-RMSE and NMBE would be 15.7% and 3.8%, respectively, which is deemed to be calibrated. As a result, the whole-building energy usagemore » after calibration of the VRF-DOAS model is 1.9% (78.8 kWh) lower than that of the measurements during comparison period.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2]
  1. Mississippi State Univ., Starkville, MS (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1409253
DOE Contract Number:
AC05-00OR22725
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy and Buildings; Journal Volume: 158; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; Variable refrigerant flow; Dedicated outdoor air system; Building simulation; Calibration

Citation Formats

Kim, Dongsu, Cox, Sam J., Cho, Heejin, and Im, Piljae. Model calibration of a variable refrigerant flow system with a dedicated outdoor air system: A case study. United States: N. p., 2017. Web. doi:10.1016/j.enbuild.2017.10.049.
Kim, Dongsu, Cox, Sam J., Cho, Heejin, & Im, Piljae. Model calibration of a variable refrigerant flow system with a dedicated outdoor air system: A case study. United States. doi:10.1016/j.enbuild.2017.10.049.
Kim, Dongsu, Cox, Sam J., Cho, Heejin, and Im, Piljae. Mon . "Model calibration of a variable refrigerant flow system with a dedicated outdoor air system: A case study". United States. doi:10.1016/j.enbuild.2017.10.049.
@article{osti_1409253,
title = {Model calibration of a variable refrigerant flow system with a dedicated outdoor air system: A case study},
author = {Kim, Dongsu and Cox, Sam J. and Cho, Heejin and Im, Piljae},
abstractNote = {With increased use of variable refrigerant flow (VRF) systems in the U.S. building sector, interests in capability and rationality of various building energy modeling tools to simulate VRF systems are rising. This paper presents the detailed procedures for model calibration of a VRF system with a dedicated outdoor air system (DOAS) by comparing to detailed measured data from an occupancy emulated small office building. The building energy model is first developed based on as-built drawings, and building and system characteristics available. The whole building energy modeling tool used for the study is U.S. DOE’s EnergyPlus version 8.1. The initial model is, then, calibrated with the hourly measured data from the target building and VRF-DOAS system. In a detailed calibration procedures of the VRF-DOAS, the original EnergyPlus source code is modified to enable the modeling of the specific VRF-DOAS installed in the building. After a proper calibration during cooling and heating seasons, the VRF-DOAS model can reasonably predict the performance of the actual VRF-DOAS system based on the criteria from ASHRAE Guideline 14-2014. The calibration results show that hourly CV-RMSE and NMBE would be 15.7% and 3.8%, respectively, which is deemed to be calibrated. As a result, the whole-building energy usage after calibration of the VRF-DOAS model is 1.9% (78.8 kWh) lower than that of the measurements during comparison period.},
doi = {10.1016/j.enbuild.2017.10.049},
journal = {Energy and Buildings},
number = C,
volume = 158,
place = {United States},
year = {Mon Oct 16 00:00:00 EDT 2017},
month = {Mon Oct 16 00:00:00 EDT 2017}
}