Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 328232
Title Daily Temperature Integration: a Simulation Study to quantify Energy Consumption
Author(s) Körner, O.; Bakker, M.J.; Heuvelink, E.
Source Biosystems Engineering 87 (2004)3. - ISSN 1537-5110 - p. 333 - 343.
Department(s) Horticultural Supply Chains
Publication type Refereed Article in a scientific journal
Publication year 2004
Keyword(s) chrysanthemum - model - dif
Abstract A combined greenhouse climate and control model was used to study energy consumption in year-round cut chrysanthemum. Temperature was either controlled for energy saving with temperature integration within 24h using the margin between heating and ventilation temperature b as control (TI) or the temperature integration regime was restricted within 24h by a set point for negative temperature difference between average day and average night temperature T-DIF to attain a temperature regime for stem length control (TIDIF). Energy consumption was reduced by both regimes compared to a standard regime according to commercial practice when heating in winter was shifted to nighttime using a screen. With increasing weather fluctuations in spring and autumn, weekly energy consumption could decrease by more than 60% for TI with +/-6degreesC temperature bandwidth. With TIDIF in the same period, only 37 or 17% (T-DIF of -6 and -12degreesC, respectively) less energy was used than with a standard recommended climate regime (TP). In general, TIDIF reduced energy demand compared to TP, but energy saving was higher with TI. In deciding whether to apply either TI or TIDIF, the actual cultivation period is the most important criterion. Controlling stem length with a negative temperature difference in spring and autumn has the highest additional costs, control with almost no negative day to night temperature difference is possible in summer; during winter, both temperature control regimes result in an almost similar greenhouse climate. (C) 2003 Silsoe Research Institute. All rights reserved Published by Elsevier Ltd.
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