Ji-Hye Ryu ¹, Won-Hwa Hong ², Ji-Ae Lee ¹, Wook-Jung Na ³

Affiliations
1 School of Architectural, Civil, Environmental and Energy Engineering, Kyungpook National University, KR
2 School of Architecture and Civil Engineering, Kyungpook National University, KR
3 Department of Fire and Disaster Prevention Engineering, Changshin University, KR

Abstract

High air-tightness and high heat-insulation of buildings cause lack of fresh air inside the buildings. Operating the ventilation system in an apartment house may improve the indoor air quality, but may generate the problems, such as high airconditioning load and cold draft. In order to improve the indoor air quality while maintaining pleasant heat environment to a certain level, it is necessary to consume energy for cooling and heating. Energy Recovery Ventilation system (here in after “ERVs”) is the typical way to minimize the consumption of energy. To solve the problem, the installation of ERVs has been made mandatory for new apartment buildings that are constructed in the Republic of Korea. The interest in ERVs has increased recently in that the System is viewed as helping to: 1. Reduce energy costs of heating and cooling apartment buildings, which costs claim a significant portion of apartment building management budgets, and 2. Secure appropriate levels of ventilation in such buildings. Despite the enthusiasm, the lack of efficient implementation of ERVs persists. Based on the rationale, this study realized the optimal operating algorithm for ERVs. The study took actual data on temperature and humidity; operation status on air conditioners and ERVs; electricity consumptions; and PMV. The study analyzed airconditioning ventilation loads and energy-saving effects related thereto according to the optimal operating algorithm for ERVs. The results showed statistically significant figures that contribute to the reduction of loads and energy costs. Implications of the study include: 1. Introducing the optimal ERVs to apartment buildings will likely help the residents and building managers to better respond to changes occurring to the outside environment and to the inside loads being applied to indoor HVAC systems; and 2. Implementation of ERVs would likely help reduce the loads being imposed on the HVAC systems in apartment buildings.

Keywords

Apartment Houses, Energy Consumption, ERVs (Energy Recovery Ventilation System), Field Survey, Optional Operation, Resident

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Ji-Ae Lee ¹, Won-Hwa Hong ², Ji-Hye Ryu ¹, Gyu-Yeob Jeon ³

Affiliations
1 Civil, Environmental and Energy Engineering, Kyungpook National University, KR
2 School of Architecture and Civil Engineering, Kyungpook National University, Daegu, KR
3 School of Architecture Engineering, Jeju National University, KR

Abstract

Electricity demand is surging every year in Korea owing to economic growth and a subsequent increase in energy demand. In particular, heavy cooling load during summer and high heating load during winter to fight heat wave and cold wave, respectively, which are allegedly caused by the unpredictable climate change, trigger electricity peak and unstable energy supply as a result. Integrated Energy Business (IEB), which is known as regional heating overseas, draws attention as a distributed energy that can address such structural issues as blackout in the central supply system. Yet, electricity charge lower than production cost, realistic challenges in direct sales of energy production facilities and energy loss incurred from transporting energy from supply facilities to receiving ends keep it from ischolar_maining down in Korea. This study compared number of households, number of buildings to which electricity is supplied, capacity of supply facilities, amount of fuel and production and sales volume of energy in order to determine appropriate supply capacity of heat and electricity in regional cooling/heating areas and industrial complexes based on Korea's IEB operation. Also, the study grouped IEB systems according to sizes of energy supply facilities and compared them so as to suggest an appropriate size of IEB and an effective supply system that can be considered for new housing site projects or re-developed regions.

Keywords

Combined Heat Power Plant, District Heating, Energy Supply System, Industrial Estate Heating, Integrated Energy Business.

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