Steady-state simulation of the seawater greenhouse condenser

Abdulrahim Al Ismaili, Edward Keith Weatherhead

Research output: Contribution to journalArticle

Abstract

This paper presents an integrated steady-state model simulating the condenser of a seawater greenhouse in Oman. The developed model is capable of predicting the outlet air temperature and humidity, the outlet seawater temperature and the condensation rate. Validation experiments showed a good conformity between the predicted and measured values within the calibration ranges at high and low air flowrates. The mean predictive error (PE) for the predicted condensation rate was 15.25 and 22.67 mL min-1 at high and low flowrates, respectively and the index of agreement (IA) was 0.96 and 0.98, respectively. The model also accurately predicted the outlet humidity ratio with PE values of –0.00006 and –0.00018 kg kg-1 for high and low air flowrates, respectively and IA values of 1.00 and 0.99, respectively. The model showed a small discrepancy between the measured and predicted outlet air temperature but yet with a PE value of 0.35oC and 2.44oC at high and low air flowrates, respectively and IA values of 0.92 and 0.86, respectively. This discrepancy was attributed greatly to inaccuracy related to measurements caused by the non-horizontal airflow pattern and less-likely due to inaccuracy related to the simulation. The accuracy of the model to predict the outlet seawater temperature was excellent with a PE of –0.33oC and –0.10oC for high and low air flowrates, respectively and IA values of 0.98 and 0.99, respectively. Model’s accuracy was also evaluated using three additional statistical prediction indicators; coefficient of determination, mean absolute predictive error and root mean square error. It was found that all prediction indicators for high and low air flowrates were very good.

Original languageEnglish
Pages (from-to)52-60
Number of pages9
JournalAgricultural Engineering International: CIGR Journal
Volume20
Issue number2
Publication statusPublished - Sep 1 2018

Fingerprint

condensers
Greenhouses
Seawater
seawater
greenhouses
air
Air
humidity
air temperature
Condensation
Atmospheric humidity
prediction
Oman
Temperature
air flow
temperature
Mean square error
calibration
Calibration

Keywords

  • Condenser
  • Humidification-dehumidification
  • Seawater greenhouse
  • Simulation

ASJC Scopus subject areas

  • Automotive Engineering
  • Agronomy and Crop Science
  • Energy (miscellaneous)
  • Industrial and Manufacturing Engineering

Cite this

Steady-state simulation of the seawater greenhouse condenser. / Al Ismaili, Abdulrahim; Weatherhead, Edward Keith.

In: Agricultural Engineering International: CIGR Journal, Vol. 20, No. 2, 01.09.2018, p. 52-60.

Research output: Contribution to journalArticle

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