Journal of the Architectural Institute of Korea Structure & Construction (대한건축학회논문집:구조계)

Architectural Institute of Korea (대한건축학회)
권호 표지
DOI QR코드

DOI QR Code

Comparison of Energy Performance and Indoor Thermal Comfort according to Temperature and Comfort Control in VRF System

VRF 시스템 적용 건물의 온도 및 쾌적 제어에 따른 에너지 성능과 실내 열쾌적 비교 분석

  • Received : 2017.07.03
  • Accepted : 2017.09.05
  • Published : 2017.11.30
⟨ Previous Next ⟩

Abstract

Even though the building temperature setting guideline saves energy, it does not take the occupants' thermal comfort into consideration. In this study, we selected a college building equipped with VRF system, and created a simulation model using EnergyPlus similar to the actual building to compare and analyze actual energy usage. We evaluated thermal comfort index and energy performance output based on temperature and thermal comfort control method after we verified the validity of the model. When the buildings' actual energy usage and simulation results were compared, MBE was 4.62% and Cv(RMSE) was 7.86%. The MBE and Cv(RMSE) values satisfied ASHRAE standards. When the temperature was adjusted to $24^{\circ}C$, the thermal comfort ratio was approximately 41%. When comfort control was carried out with PMV 0.5, thermal comfort ratio was increased to approximately 92% by executing cooling, dehumidification, and blowing modes. The comfort control model case showed 5.1% increase in energy consumption compared to the base case. However, 7.4% energy was saved when the temperature was controlled at $24^{\circ}C$ assumed to similar condition like PMV 0.5 comfort control. Therefore, evaluation showed that thermal comfort control allows better energy saving as well as increased thermal comfort than performing simple temperature control method.

Keywords

Acknowledgement

Supported by : 국토교통부

References

  1. ASHRAE Standard 55-2013 (2015), Thermal Environmental Conditions for Human Occupancy
  2. ASHRAE Standard 140-2007 (2011), Standard Method of Test for the Evaluation of Building Energy Analysis Computer Programs
  3. DOE, EnergyPlus Documentation Engineering Reference (2015), US Department of Energy
  4. Jeon J. U., Lee, S. I., Hong, D. H., & Kim, Y. C. (2010). Performance Evaluation and Modeling of a Hybrid Cooling System Combining a Screw Water Chiller with a Ground Source Heat Pump in a Building, Energy, 35(5)
  5. Kim, C. H., & Kim, K. S. (2015). Evaluation of Thermal and Visual Environment for the Glazing and Shading Device in an Office Building with Installed of Venetian Blind, Korea Institute of ecological architecture and environment (KIEAE), 15(6)
  6. Kim, D. K., Jeon, J. U., & Kim, K. S. (2011). Comparison of Actual Cooling Energy Consumption with Calculated Cooling Energy Consumption and Analysis of Energy Performance between GHP and EHP, Architectural Institute of Korea, 27(5)
  7. Lee, J. Y. (2012). Heat Pump Technology for Building Energy Saving, Korea Institute of Energy Technology Evaluation and Planning (KETEP), Issue Paper
  8. Ministry of Trade, Industry and Energy (2017), Regulations on the Promotion of Rationalization of Energy Use by Public Agencies
  9. Ministry of Environment (2017), Indoor Air Quality Management Method in the Public Facilities
  10. Ministry of Land, Infrastructure and Transport & Korea Energy Agency (2015), Building energy saving design standards
  11. M&V guidelines (2008), Measurement and Verification for Federal Energy Projects Version 3.0, US Department of Energy
  12. Richard Raustad (2012). Florida Solar Energy Center, Creating Performance Curves for Variable Refrigerant Flow Heat Pumps in EnergyPlus
  13. T, N. Aynur., Y, Hwang., & R, Radermacher. (2010). Integration of Variable Refrigerant Flow and Heat Pump Desiccant Systems for the Cooling Season, Applied Thermal Engineering, 30(8-9)
  14. Y, Cheng., J, Niu., & N, Gao. (2012). Stratified Air Distribution Systems in a Large Lecture Theatre: A Numerical Method to Optimize Thermal Comfort and Maximize Energy Saving, Energy and Buildings, 55
  15. Y, P. Zhou., J, Y. Wu., R, Z. Wang., S, Shiochi. (2007). Energy simulation in the variablere frigerant flow air-conditioning system under cooling conditions, Energy and Buildings, 39(212-220)
  16. Zhu, Y., X, Jin., Z, Du., X, Fang., & B, Fan. (2014). Control and Energy Simulation of Variable Refrigerant Flow Air Conditioning System Combined with Outdoor Air Processing Unit, Applied Thermal Engineering, 64(1-2)