Performance Evaluation of Heat Exchange Element by Numerical Model

• CHUNG Juyeon

  Fukuoka Women’s University

• SOTOKAWA Hajime

  Mitsubishi Electric Corp./IGSES, Kyushu University

• KAMEISHI Keiji

  Mitsubishi Electric Corp.

• YOO Sung-Jun

  IGSES, Kyushu University

• ITO Kazuhide

  IGSES, Kyushu University

Bibliographic Information

Other Title

• 数値解析による換気用全熱交換エレメントの性能評価
• Part 2-Heat and Mass Transfer Analysis in Energy Recovery Ventilator by Coupled CFD and Hygrothermal Transfer Model
• 第2報−CFDと熱水分移動解析モデルの連成解析を適用した小型全熱交換エレメントの解析と流路設計への展開

Abstract

In order to achieve a sustainable design for residential houses, it is essential to optimize the energy consumption for heating, ventilating, and air-conditioning (HVAC) systems and the use of an energy recovery the ventilator (ERV), which can recover the sensible and latent heat, is considered as one of the most effective ways to reduce the ventilation load in buildings. In this study, we clarify the heat and moisture transfer mechanism in the energy recovery ventilator (ERV) unit and focus on the development of a mathematical model for predicting the hygrothermal transfer efficiency by integrating computational fluid dynamics (CFD) analysis in ERV. Toward this end, firstly we arranged the governing equations of the hygrothermal transfer models applied in the ERV unit and conducted fundamental experiments to measure the adsorption isotherm (constant volume method) and moisture conductivity (cup method) in order to identify the model parameters. Secondly, we established a coupled numerical simulation model of CFD (convective heat and moisture transfer in air) and hygrothermal transfer model (simultaneous heat and moisture transport equations in solid material) to predict the temperature and enthalpy exchange efficiency in the ERV unit. As a result of the coupled analysis of the CFD and hygrothermal transfer model, we confirmed that our proposed numerical models showed reasonable agreement with the experimental results. In addition to the fundamental analysis for discussing the prediction accuracy, we carried out sensitivity analyses for targeting three types of flow channel models in the ERV unit. As for the staggered flow channel model, the improvements in the convective heat transfer coefficient and fin efficiency were confirmed. The flow channel model with the patch that introduces the discontinuous adiabatic surface was confirmed to have a possibility to improve the temperature and enthalpy exchange efficiencies without increasing the exchange surface area.

Journal

• Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan

  Transactions of the Society of Heating,Air-conditioning and Sanitary Engineers of Japan 44 (271), 1-9, 2019-10-05

  The Society of Heating, Air-Conditioning & Sanitary Engineers of Japan

Keywords

• CFD
• Energy Recovery Ventilator
• Enthalpy Exchange Unit
• Hygrothermal Transfer Model
• Fin Efficiency

Details

• CRID: 1390567172584904832
• NII Article ID: 130007922535
• DOI: 10.18948/shase.44.271_1
• ISSN: 24240486
• ISSN: 0385275X
• Text Lang: ja
• Data Source:
  • JaLC
  • CiNii Articles
• Abstract License Flag: Disallowed