Development and evaluation of combustion-type CO<sub>2</sub> enrichment system connected to heat pump for greenhouses

Development and evaluation of combustion-type CO₂ enrichment system connected to heat pump for greenhouses

Seung-Hwan Yang, Chun Gu Lee, Alireza Ashtiani-Araghi, Joon Yong Kim, Research Institute for Agriculture and Life Sciences, Seoul National University [Korea, Republic of]">Joong Yong Rhee

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Keywords: CO₂ fertilization, CO₂ generator, Heat pump, Environmental control, Thermal energy recovery

JOURNAL FREE ACCESS

2014 Volume 7 Issue 1 Pages 28-33

DOI https://doi.org/10.1016/j.eaef.2013.12.005

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Abstract

The exhaust gas from combustion has been extensively used for greenhouse CO₂ fertilization. However, its toxic gases and thermal energy would generally limit the proper applicability. The aim of this study is to develop a technology to supply toxic gas-free CO₂ and to recover exhaust gas thermal energy. A combustion-type CO₂ generator was manufactured and connected to a heat pump system for greenhouse heating and cooling. Control algorithm for effective operation of the system was also developed and implemented. Greenhouse operation was run at the conditions under which values for CO₂ concentration and indoor temperature were maintained at 1200e1300 ppm and 25–27 °C, respectively. Technical performance of the system was evaluated in cold, moderate and hot seasons.

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