Greenhouse Cooling and Heat Recovery Using Fine Wire Heat Exchangers in a Closed Pot Plant Greenhouse: Design of an Energy Producing Greenhouse

Bakker, J.C.; Zwart, H.F. de; Campen, J.B.

doi:10.17660/actahortic.2006.719.29

Cited by 24 publications

(24 citation statements)

References 7 publications

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“…This STE energy can be efficiently utilized with closed greenhouses (Bakker et al, 2006;Vadiee & Martin, 2012, 2013a. Yang et al (2012a) investigated the daily change of greenhouse indoor temperatures and designed a greenhouse system to utilize STE using a heat pump system, which recovers and stores STE and then supplies it when necessary.…”

Section: Al 2009mentioning

confidence: 99%

Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization

Yang

Son

Lee

et al. 2016

Span. j. agric. res.

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This study concentrates on the utilization of surplus thermal energy (STE) in greenhouses. Even in the cold season, the thermal energy input from solar radiation easily exceeds the required amount for heating on a clear day in the temperate or subtropical regions. This excessive solar energy is regarded as STE. There are several studies related to the STE energy (Pavlou, 1991; Suh et RESEARCH ARTICLE OPEN ACCESS AbstractIf a greenhouse in the temperate and subtropical regions is maintained in a closed condition, the indoor temperature commonly exceeds that required for optimal plant growth, even in the cold season. This study considered this excess energy as surplus thermal energy (STE), which can be recovered, stored and used when heating is necessary. To use the STE economically and effectively, the amount of STE must be estimated before designing a utilization system. Therefore, this study proposed an STE model using energy balance equations for the three steps of the STE generation process. The coefficients in the model were determined by the results of previous research and experiments using the test greenhouse. The proposed STE model produced monthly errors of 17.9%, 10.4% and 7.4% for December, January and February, respectively. Furthermore, the effects of the coefficients on the model accuracy were revealed by the estimation error assessment and linear regression analysis through fixing dynamic coefficients. A sensitivity analysis of the model coefficients indicated that the coefficients have to be determined carefully. This study also provides effective ways to increase the amount of STE.Additional key words: energy balance; energy conservation; environmental control; heat pump; heat storage Abbreviations used: FCU (fan coil unit); HST (high temperature heat storage tank); LST (low temperature heat storage tank); mPLAI (modified PLAI, ratio of total projected leaf area to the floor area); PLAI (projected leaf area index, projected area of horizontal leaves per unit of horizontal land below); SHEF (sensible heat emission factor); STE (surplus thermal energy) Citation: Yang, S. H.; Son, J. E.; Lee, S. D.; Cho, S. I.; Ashtiani-Araghi, A.; Rhee, J. Y. (2016). Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization.

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Section: Al 2009mentioning

confidence: 99%

Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization

Yang

Son

Lee

et al. 2016

Span. j. agric. res.

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“…neighbouring greenhouses or buildings. To achieve this, the performance of the greenhouse as a solar collector has to be maximized by 1): further reduction of the heat loss and 2): maximizing the heat collection by very efficient heat exchangers (Bakker et al, 2006). Simulations showed that with this system theoretically a year round heat production might be expected of about 800 MJ, comparable to the equivalence of 25 m 3 natural gas (de Zwart and Campen, 2005).…”

Section: Integral Design Of Energy Efficient Greenhouse Systemsmentioning

confidence: 99%

Innovative Technologies for an Efficient Use of Energy

Bakker¹,

Adams²,

Boulard³

et al. 2008

Acta Hortic.

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Efficient use of energy in greenhouses has been subject of research and development for decades. The final energy efficiency, e.g. the amount of energy used per unit of product, is determined by improvements in energy conversion, reductions in energy use for environmental control and the efficiency of crop production. The new European targets on reduction of CO 2 emission have resulted in a renewed interest in innovative technologies to improve energy efficiency in greenhouses designed for North-as well as South European regions. In this paper an overview of the recent developments is presented from both the Northwest European as well as the Mediterranean perspective. The developments range from new modified covering materials, innovative and energy conservative climate control equipment and plant response based control systems, to integrated energy efficient greenhouse designs.

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“…The function of the greenhouse as a solar collector is thereby maximized by further reduction of the heat loss from the greenhouse and maximizing the heat collection by much more efficient heat exchangers ( Fig. 4; Bakker et al, 2006). Currently in the Netherlands projects are set up with heat delivery from greenhouses to normal houses in so-called "energy grids".…”

Section: Integral Design Of Energy Efficient Greenhouse Systemsmentioning

confidence: 99%

“…Since the incoming solar radiation represents about twice the energy used in the greenhouse itself, this theoretically creates the possibility to use the greenhouse as a combined crop and heat producing system. The basic principle is a completely closed greenhouse from which the heat surplus during the summer is extracted by a cooling system, stored in a long term storage medium, and reused during the winter period for heating the greenhouse itself and neighbouring greenhouses or buildings (Bakker et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Model Application for Energy Efficient Greenhouses in the Netherlands: Greenhouse Design, Operational Control and Decision Support Systems

Bakker¹

2006

Acta Hortic.

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The development of energy conservative greenhouse systems is the overall result of improvement of greenhouse construction, cladding materials and insulating techniques, innovative climate control equipment and implementation of physical and physiological knowledge in the operational climate control systems. The development of these systems represents an optimisation problem and the use of both physical as well as physiological information and models has shown to be a most powerful tool in dealing with this. In this paper some recent examples of relevant application of models in the design, operational control and evaluation of energy conservative greenhouse systems are presented, based on recent results and research in The Netherlands.

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Greenhouse Cooling and Heat Recovery Using Fine Wire Heat Exchangers in a Closed Pot Plant Greenhouse: Design of an Energy Producing Greenhouse

Cited by 24 publications

References 7 publications

Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization

Surplus thermal energy model of greenhouses and coefficient analysis for effective utilization

Innovative Technologies for an Efficient Use of Energy

Model Application for Energy Efficient Greenhouses in the Netherlands: Greenhouse Design, Operational Control and Decision Support Systems

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