STEADY STATE MODELLING OF A GREENHOUSE HAVING A TRIPLE LAYER COVER AND USING GROUND WATER FOR NIGHT HEATING
A way of utilizing efficiently the big quantities of low enthalpy energy found in ground water is presented. Ground water keeps a more or less steady temperature over the year, which in many cases, although being less or equal to the desired greenhouse temperature, in most cases is well above the night temperature of the environment. Energy can thus be transferred from the ground water to the environment, creating a thermal blanket over the greenhouse which prevents (or keeps down) any energy losses from the greenhouse itself. As plastic transparent hollow tubes become available at reasonable prices, greenhouses using the above mentioned groundwater thermal blanket become economically feasible. Such a greenhouse was simulated at steady state conditions, for various water, air and sky temperatures and for different wind velocities. Simulated results have shown that if a thermal blanket is in direct contact with the environment, in many cases the water flows needed are too big. So a thermal resistance was added by using a double hollow beam and having the water flowing through the inner hollow. Simulated results are presented for the above case. It must be noted that the possibilities of having water flowing through transparent hollow beams, offer more possibilities besides night heating (i.e. heat removal during the day). These possibilities remain to be investigated in future work.
Bibliographic Reference: INTERNATIONAL CONFERENCE ON MODELLING AND SIMULATION, SORRENTO, NAPOLI (ITALY), SEPT. 29-OCT. 1, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32907 ORA
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Record Number: 1989125056000 / Last updated on: 1987-11-01
Available languages: en