• Title, Summary, Keyword: Outdoor air cooling

Search Result 202, Processing Time 0.029 seconds

Performance Simulation of Geothermal Heat Pump (GHP) System with Different Control Schemes (제어 방식에 따른 지열 히트펌프 시스템의 성능 시뮬레이션)

  • Lee, Doo-Young;Choi, Jae-Ho;Min, Kyong-Chon;Sohn, Byonghu
    • Transactions of the KSME C: Technology and Innovation
    • /
    • v.4 no.1
    • /
    • pp.35-41
    • /
    • 2016
  • Geothermal heat pump (GHP) systems have been proved to be one of the most efficient systems for heating and cooling in buildings. However, an optimal energy performance depends on a good control of the system components, including heat pumps and circulation pumps, which affect to the total energy consumption of system. This paper presents the simulation results of the heat pump performance for two different control schemes, i.e. constant setting temperature (Control-A) and variable setting temperatures (Control-B) in buffer tank. A dynamic simulation tool, TRNSYS 17, was used to model the entire system and to assess the performance of the system. Simulation results show that the Control-B, which controls the temperature in buffer tank with outdoor air temperature, is a effective way to reduce the energy consumptions in heat pump (7.7%) and circulation pump (7.5%).

Analysis of Factors Affecting the Hygroscopic Performance of Thermally Treated Pinus koraiensis Wood (잣나무열처리재의 흡방습성능에 미치는 영향인자 분석)

  • Chang, Yoon-Seong;Han, Yeon-Jung;Eom, Chang-Deuk;Park, Joo-Saeng;Park, Moon-Jae;Choi, In-Gyu;Yeo, Hwan-Myeong
    • Journal of the Korean Wood Science and Technology
    • /
    • v.40 no.1
    • /
    • pp.10-18
    • /
    • 2012
  • A high airtightness is required for the residential spaces constructed recently to save cooling and heating energy through improving insulation performance. Because the chances to release steam formed by human activity in building and inflow of water vapor in outdoor air to residential space are reduced, the natural humidity control performance of interior materials has become more important. In this study, hygroscopic performance of thermo-physically treated wood (Pinus koraiensis) was estimated. At various relative humidity condition, the water vapor adsorption and desorption rates of wooden materials were measured as well as equilibrium moisture content. Effects of roughness and surface microstructure as physical factors and functional groups as chemical factors on the hygroscopicity were analyzed. It is expected that the results from this study and further study of measuring moisture generation in residential spaces could contribute to install a system for evaluating the hygrothermal performance of wooden building.