Optimal Thermal Load Sharing Ratio of Solar Thermal Systems Based on the Application of Buildings
Doo-Sung Choi1, Hung Chan Jeon2, Jin Seok Do3
1Doo-Sung Choi, Department of Architecture, Chungwoon University, South Korea.
2Hung Chan Jeon, Department of Architecture. Univertsity of Suwon, Wau-ri, Bongdam-eup, Hwaseong-si, Gyeonggi-do, Korea.
3Jin-Seok Do, Department of Architecture, Chungwoon University, South Korea.
Manuscript received on 01 May 2019 | Revised Manuscript received on 15 May 2019 | Manuscript published on 30 May 2019 | PP: 2719-2727 | Volume-8 Issue-7, May 2019 | Retrieval Number: G6390058719/19©BEIESP
Open Access | Ethics and Policies | Cite | Mendeley | Indexing and Abstracting
© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: This study presented a method of estimating optimal thermal load sharing ratio of solar-powered hot water supply systems through a case study of multi-unit dwellings and accommodations, of which the proportion of hot water usage was large among buildings actually applying solar-powered hot water supply systems. The result of a comparative analysis of actual usage characteristics of hot water by applying the existing criteria of estimating capacity of solar-powered hot water supply systems, when the per-year sharing ratio of solar-powered hot water supply was 60%, the quantity of solar-powered heat production was about 1.1 – 1.5 times the monthly load in a certain period of time such as summer; and when the annual sharing ratio of solar powered hot water supply was 80%, the quantity of solar-powered heat production was about 1.2 – 1.7 times, which was analyzed that the system efficiency became deteriorated. The study presented a method of applying the optimal sharing ratio of solar powered hot water supply by taking into account economic feasibility based on the result; and if the sharing ratio of solar powered hot water supply of an existing solar-powered hot water supply system were increasing from 10% up to 21%, payback period of facility investment cost would be shortened by one to three years. In addition, when changing solar collector area of a solar-powered hot water supply system by taking into account the optimal sharing ratio of solar-powered hot water supply as proposed by this study, the proportion of solar-powered hot water production was increasing from 17 ℓ/person·day to 47 ℓ/person·day, which would increase the proportion of solar powered hot water production to 49%, a 15% increase on average. Thus, it was analyzed that when the solar-powered hot water production was increased, it would secure the economic feasibility and enhance the energy savings effect.
Keyword: Solar-Powered Hot Water Supply System, Hot Water Load Fraction, Optimum Distribution Ratio, Usage Characteristics, Payback Period.
Scope of the Article: Thermal Engineering