Heating performance analysis of the region control method for heat pump with thermal storage system

다국어 초록 (Multilingual Abstract)

A heat pump with thermal storage system comprises a heat pump and a thermal storage tank. Heat pumps store thermal energy in the thermal storage tank during the night; this then allows for the stored thermal energy and heat pump to meet the heating load demands during the day. This system contributes to the stabilization of the electric power supply and demand as well as makes it possible to realize the economic benefit of using inexpensive electric power during the night. Control strategies include the use of conventional control methods such as thermal storage priority and heat pump priority methods and region control methods. The region control method combines the advantages of both conventional methods. In this study, the system comprises a heat pump with a latent thermal storage tank.
The heating load is that required for an office building and was calculated using the TRNSYS software. The power consumption and electricity cost were analyzed by conducting experiments according to the heating load size and each of the three control methods. The region control method was performed at the optimal operating ratio, which was the best in terms of electricity cost. It was noted that the utilization ratio of the thermal storage tank was also high. When comparing the region control method at 80 % design load with the thermal storage priority method, the heat pump coefficient of performance was higher and the power cost was lower by 5.7 %. However, the utilization ratio of thermal storage was higher than the heat pump priority method and the power cost was 5.2 % lower. Therefore, it is confirmed that the region control method is more effective than the conventional methods.

참고문헌 (Reference)

1 이경호, "운전비 절감을 위한 빙축열시스템 냉동기 운전기법 평가" 대한설비공학회 20 (20): 97-105, 2008

2 안영환, "빙축열 냉방시스템의 운전특성 및 비용 분석" 대한설비공학회 17 (17): 156-164, 2005

3 H. T. Seok, "Thermal performance evaluation of design parameters and development of load prediction equations of office buildings" 13 (13): 914-921, 2001

4 "TRNSYS 17"

5 D. G Lee, "Single phase-change analysis of two different PCMs filled in a heat transfer module" 30 (30): 2813-2826, 2016

6 P. B. Rupanagunta, "Scheduling of cool storage using non-linear programing techniques" 10 (10): 1279-1285, 1995

7 한동원, "Performance analysis of air source heat pump system for office building" 대한기계학회 30 (30): 5257-5268, 2016

8 K. H. Lee, "Optimal scheduling of ice storage system with prediction of cooling loads" 12 (12): 982-993, 2000

9 Abdel Illah Nabil Korti, "Numerical Heat Flux Simulations on Double-Pass Solar Collector with PCM Spheres Media" 대한설비공학회 24 (24): 1-13, 2016

10 조성환, "MEASURED ENERGY CONSUMPTION ANALYSIS OF A DISTRICT HEATING SYSTEM UNDER DIFFERENT TEMPERATURE CONTROL STRATEGIES" 대한설비공학회 22 (22): 1-8, 2014

11 "LabVIEW 2012 SP1"

12 "KSES, Korean standard weather data"

13 Korea Electric Power Corporation, "KEPCO Selective Terms of Supply"

14 C. S. Jung, "Ice storage system" 22 (22): 101-108, 1993

15 J. K. DABAS, "EXPERIMENTAL INVESTIGATION OF A REFRIGERATION SYSTEM WORKING UNDER TRANSIENT CONDITIONS" 대한설비공학회 22 (22): 1-14, 2014

16 M. Kintner-Meyer, "Cost optimal analysis and load shifting potentials of cold storage equipment" 101 (101): 539-548, 1995

17 Md. Imran H. Khan, "Conventional Refrigeration Systems Using Phase Change Material: A Review" 대한설비공학회 24 (24): 1-16, 2016

18 S. H. Jung, "Control strategy for economic operation of an ice-storage system considering cooling load variation" 12 (12): 140-149, 2000

19 D. Y. Lee, "Comparative analysis of the minimum capacity of an ice-on-coil thermal storage system for various operation strategies" 11 (11): 401-413, 1999

20 D. H. Spethmann, "Application considerations in optimal control of cool storage" 1009-1015, 1993

21 C. S. Lee, "A study on optimal control methods for cooling of heat pump and latent heat storage system" Kookmin University 2015

22 Y. B. Yun, "A study on heating load analysis and demand side management on winter peak period" 20-22, 2011

23 Hak Soo Kim, "A numerical study on the oil retention of R410A and PVE oil mixture in multi heat pump system" 대한기계학회 30 (30): 1891-1901, 2016

24 J. E. Braun, "A comparison of heat pump-priority, storage priority, and optimal control of an ice-storage system" 893-902, 1992