Controlling temperature and relative humidity of ventilation air by using a cooling coil and rotary heat exchangers

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Publication Details

Author list: Ibrahim F., Chirarattananon S., Rakkwamsuk P., Chaiwiwatworakul P., Chuangchote S., Hien V.D.

Publication year: 2021

Journal: International Energy Journal (1513-718X)

Volume number: 21

Issue number: 3

Start page: 401

End page: 414

Number of pages: 14

ISSN: 1513-718X

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85114795710&partnerID=40&md5=9ccd957d8c48212514c13bcbd953dca5

Languages: English-Great Britain (EN-GB)

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Abstract

Dedicated outdoor air systems (DOAS) are used to supply treated outdoor air to a cooled space. This paper focuses on a DOAS and its application in tropical climate. This DOAS is equipped with a desiccant coated Enthalpy Wheel (EW), a dehumidifying cooling coil (CC), and a sensible heat wheel (SW). A mathematical model was developed using the governing equations and validated with a TRNSYS simulation and experimental data with a coefficient of determination of 0.88 and 0.92, respectively. Simulations using the validated model showed that the DOAS configuration was applicable for the tested tropical climatic conditions. Further investigations showed that a maximum change in temperature with respect to rotational speed of SW achieved was 2.44°C, and maximum change in humidity ratio with respect to rotational speed of EW achieved was 0.38%. Also, CC showed a maximum change in temperature of 14.69°C and humidity ratio of 8.35% with respect to chilled water flow rate. Likewise, Air flow rate also showed change in temperature and humidity ratio of the supplied air. © 2021 Regional Energy Resources Information Center (RERIC), Asian Institute of Technology. All rights reserved.

Keywords

Enthalpy wheel, Sensible wheel