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Title: Verification of Energy Reduction Effect through Control Optimization of Supply Air Temperature in VRF-OAP System

Abstract

This paper developed an algorithm that controls the supply air temperature in the variable refrigerant flow (VRF), outdoor air processing unit (OAP) system, according to indoor and outdoor temperature and humidity, and verified the effects after applying the algorithm to real buildings. The VRF-OAP system refers to a heating, ventilation, and air conditioning (HVAC) system to complement a ventilation function, which is not provided in the VRF system. It is a system that supplies air indoors by heat treatment of outdoor air through the OAP, as a number of indoor units and OAPs are connected to the outdoor unit in the VRF system simultaneously. This paper conducted experiments with regard to changes in efficiency and the cooling capabilities of each unit and system according to supply air temperature in the OAP using a multicalorimeter. Based on these results, an algorithm that controlled the temperature of the supply air in the OAP was developed considering indoor and outdoor temperatures and humidity. The algorithm was applied in the test building to verify the effects of energy reduction and the effects on indoor temperature and humidity. Loads were then changed by adjusting the number of conditioned rooms to verify the effect of themore » algorithm according to various load conditions. In the field test results, the energy reduction effect was approximately 15–17% at a 100% load, and 4–20% at a 75% load. However, no significant effects were shown at a 50% load. The indoor temperature and humidity reached a comfortable level.« less

Authors:
 [1];  [1]; ORCiD logo [2];  [3]
  1. Samsung LED, R&D Inst., Suwon (Republic of Korea)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Building Technologies Research and Integration Center (BTRIC)
  3. Gyeongsang National University (GNU), Korea. Dept. of Architectural Engineering (ERI)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE; National Research Foundation of Korea (NRF)
OSTI Identifier:
1422474
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Energies (Basel)
Additional Journal Information:
Journal Name: Energies (Basel); Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 1996-1073
Publisher:
MDPI AG
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; variable refrigerant system (VRF); outdoor air processing unit (OAP); control algorithm; experiment; field test; energy savings

Citation Formats

Lee, Je, Yoon, Hyun, Im, Piljae, and Song, Young-hak. Verification of Energy Reduction Effect through Control Optimization of Supply Air Temperature in VRF-OAP System. United States: N. p., 2017. Web. doi:10.3390/en11010049.
Lee, Je, Yoon, Hyun, Im, Piljae, & Song, Young-hak. Verification of Energy Reduction Effect through Control Optimization of Supply Air Temperature in VRF-OAP System. United States. doi:10.3390/en11010049.
Lee, Je, Yoon, Hyun, Im, Piljae, and Song, Young-hak. Wed . "Verification of Energy Reduction Effect through Control Optimization of Supply Air Temperature in VRF-OAP System". United States. doi:10.3390/en11010049. https://www.osti.gov/servlets/purl/1422474.
@article{osti_1422474,
title = {Verification of Energy Reduction Effect through Control Optimization of Supply Air Temperature in VRF-OAP System},
author = {Lee, Je and Yoon, Hyun and Im, Piljae and Song, Young-hak},
abstractNote = {This paper developed an algorithm that controls the supply air temperature in the variable refrigerant flow (VRF), outdoor air processing unit (OAP) system, according to indoor and outdoor temperature and humidity, and verified the effects after applying the algorithm to real buildings. The VRF-OAP system refers to a heating, ventilation, and air conditioning (HVAC) system to complement a ventilation function, which is not provided in the VRF system. It is a system that supplies air indoors by heat treatment of outdoor air through the OAP, as a number of indoor units and OAPs are connected to the outdoor unit in the VRF system simultaneously. This paper conducted experiments with regard to changes in efficiency and the cooling capabilities of each unit and system according to supply air temperature in the OAP using a multicalorimeter. Based on these results, an algorithm that controlled the temperature of the supply air in the OAP was developed considering indoor and outdoor temperatures and humidity. The algorithm was applied in the test building to verify the effects of energy reduction and the effects on indoor temperature and humidity. Loads were then changed by adjusting the number of conditioned rooms to verify the effect of the algorithm according to various load conditions. In the field test results, the energy reduction effect was approximately 15–17% at a 100% load, and 4–20% at a 75% load. However, no significant effects were shown at a 50% load. The indoor temperature and humidity reached a comfortable level.},
doi = {10.3390/en11010049},
journal = {Energies (Basel)},
number = 1,
volume = 11,
place = {United States},
year = {2017},
month = {12}
}

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Works referenced in this record:

Integration of variable refrigerant flow and heat pump desiccant systems for the cooling season
journal, June 2010


Energy performance of direct expansion air handling unit in office buildings
journal, July 2014


Simulation comparison of VAV and VRF air conditioning systems in an existing building for the cooling season
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Energy simulation in the variable refrigerant flow air-conditioning system under cooling conditions
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Dynamic target high pressure control of a VRF system for heating energy savings
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Simulation and optimization of multi-split variable refrigerant flow systems
journal, December 2018


Control and energy simulation of variable refrigerant flow air conditioning system combined with outdoor air processing unit
journal, March 2014


Field performance measurements of a heat pump desiccant unit in dehumidification mode
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Integration of variable refrigerant flow and heat pump desiccant systems for the heating season
journal, April 2010