Refrigeration – Processes – Exchanging heat between plural systems – e.g. – disparate
Patent
1982-10-20
1985-04-02
Wayner, William E.
Refrigeration
Processes
Exchanging heat between plural systems, e.g., disparate
622386, 47 17, 236 49, F25B 2702, A01G 900
Patent
active
045079293
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method and an installation for regulating the temperature in a greenhouse.
The way in which to obtain and to maintain favorable climatic conditions in a greenhouse has been the object of a great number of studies and experiments. Amongst the many difficulties encountered, one of the most arduous is the one of the cooling down of the greenhouse when the temperature threatens to rise above a limit value, depending on the type of culture which is being practised. As a matter of fact, without special precautions, the temperature inside a greenhouse can rise very rapidly under the action of the solar radiations, resulting in the destruction of the plants. Therefore, the green houses have been generally equipped with opening aeration devices, shading veils and forced ventilation installations. The latter consist of a device intended for blowing into the lower part of the greenhouse or culture area a strong current of air which passes through a waterscreen at the entrance of the greenhouse.
SUMMARY OF THE INVENTION
The applicant has established that installations of this kind have many drawbacks, amongst others the drawback of submitting the plants, especially the ones that are located near to the blower, to a rather steep fall in temperature, and to cause an important evaporation, which is disasterous to their growth.
Moreover, the prolonged use of shading veils and similar devices is also unfavorable in that it considerably limits the quantity and nature of the radiations which are required for an intensive culture.
These problems become more complicated still, due to the fact of the present cost of energy, which has become a significant factor in the choice of the solutions.
The object of the invention is to provide for a new method for regulating the temperature and mainly for controlling the maximum temperature allowed in a greenhouse.
According to the invention, this method consists at least in generating, as soon as the temperature attains a predetermined value in one or more selected points of the greenhouse, a buffer area in the upper portion of the greenhouse, by blowing air at a temperature which is lower than the said predetermined value.
The installation for applying this method comprises: a device for insufflating air into the upper portion of the greenhouse; a device for cooling the air before it becomes insufflated; and a monitoring device by which the aforesaid in sufflating device and/or the aforesaid cooling device are brought under control, as a function of the temperature of the greenhouse.
BRIEF DESCRIPTION OF THE DRAWINGS
For more clearness, the invention is described hereinafter, reference being made to the attached drawings, in which:
FIG. 1 is a sketch-plan of the air circuit of a greenhouse equipped according to the invention; and
FIG. 2 is a sketch-plan of a hydraulic heating circuit, which can advantageously be superimposed on the sketch-plan of FIG. 1.
The sketch-plan of FIG. 1 shows a greenhouse 1, comprising a culture area 2 and an upper portion 3, between which a shading veil 4 can be spread out.
The method according to the invention thus consists of generating in the upper portion 3 a buffer area by insufflating air therein as soon as the temperature measured in one or more points of the greenhouse reaches a predetermined value. The insufflated air must be at a temperature which is -- for instance 5 to 15.degree. C. -- lower than the aforesaid predetermined temperature.
In order to achieve this, one or more conduits 5 are provided for in the upper portion 3 of the greenhouse, these conduits having vent-holes substantially directed towards the top of the aforesaid upper portion.
These conduits 5 are fed by a blower 6.
In order to obtain air at the temperature which is required for generating a buffer area in the upper portion 3, it is advantageous to extract air from the latter, for instance by means of a conduit 7, to cool this air down by means of a frigorific set, respectively a heat pump 8, and to send it ba
REFERENCES:
patent: 3492934 (1970-02-01), Steigerwald
patent: 4142576 (1979-03-01), Perry et al.
patent: 4315597 (1982-02-01), Garraffa, Jr.
Delta Recherche et Developpement
Wayner William E.
LandOfFree
Method and installation for monitoring the temperature in a gree does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and installation for monitoring the temperature in a gree, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and installation for monitoring the temperature in a gree will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1085271