FR2485170A1 - Heating economiser system for district heating supply - has time programmed insertion of fully adjustable resistance into temperature probe circuit - Google Patents

Abstract

The external probe of the economiser forms one arm of a wire bridge. One section of the bridge forms a temperature scale and a cursor is positioned automatically on it to balance the bridge. The cursor drives a stop on a wire resistance to take up predetermined positions for each external temperature. When the programmer clock starts an economy sequence, the motor displaces a second cursor to the end of the wire resistance and moves it with reduced speed to the stop position. This action adds the resistance to the normal temperature probe resistance to reduce heating temperature. The beginning, or the end of each adjustment is performed progressively.

Description

SCHAVI ENERGY SAVING PROCESS: FAGE ^
The present invention relates to a method complementary to the regulation of
heating, intended to save Energy.

Current regulations ensure comfort, but it is recognized that they
leave some waste behind. Indeed, additional devices have already been proposed and their use has enabled savings to be made
important without impairing comfort. The corrections made by these dis
positive consist either in completely interrupting the supply of Energy to the heating system
fage according to certain programmed cut-off sequences, these sequences being carried out only if the outside temperature is sufficiently high for the
allow either to modulate the duration of a night shutdown according to different parameters = In the first case, the heating interruption program is applied
suddenly and completely as soon as a minimum threshold is crossed, the result is that the program cannot correspond exactly to the area of waste
to delete, this surround evolving gradually as a function of 3a tempé
In the second case3, it acts as a night stop whose ap
plication is limited to only rooms unoccupied during the nit ;; And especially,
in both cases, stopping and resuming too quickly. of heating have serious disadvantages for heating installations, in particular
On the growing number of installations served by a network
district heating with pressurized water reaching a temperature of 200 ",
abrupt shutdown and resumption of calorie demand disrupts function
central heating systems and especially the sudden stop of the demand presents a danger of overheating and pressure build-up of the exchangers of the substations
On conventional installations, restarting the heating too quickly
causes a massive return of cold water to the boilers which has the consequence
significant corrosion of the latter by crossing the dew point.

Finally, in all cases, the brutal play of expansion is harmful to all of the installations.

The method according to the invention makes it possible both to avoid these drawbacks and
save more than the savings
known to date. In the method according to the invention, in fact, the action of cor
rection is progressive, the heating being only reduced and not cut by one.

on the one hand, and the reduction occurring gradually on the other. The
reduction is all the more important as the outside temperature is higher
high.

The device which is the subject of the present invention comprises a programmable clock controlling the start and the end of the reduction sequences and an external temperature probe allowing the automatic determination of the reduction value, the latter being a function of the external temperature. The implementation of this reduction can be slowed down and can be done in a more or less long time. The same is true of the resumption of heating at the end of each cut-off sequence, heating including the normal intensity provided for by conventional regulation. can be reached gradually. It is possible in this way to adjust the intensity of the reductions according to the possible economy which is essentially a function of the outside temperature. And it is possible to achieve this increased economy without disadvantages for heating installations.

The process which is the subject of the present invention comprises an electrical resistance which is variable, off-circuit outside the saving sequences prog-ramen.ées by a clockwork device, and combined during the saving sequences with the external temperature probe. of classical regulation. This resistance has a variable value depending on the outside temperature. For an outside temperature "t", this resistance has a value R t A f (t) During a cut-off sequence, the combination of this resistance Rez with the resistance of the regulator probe simulates an outside temperature for the latter higher and causes the corresponding reduction in heating by the normal play of existing devices.

On many models of regulators3 this action is obtained by switching Rt in parallel with the external probe, on other models, by switching rut in series with the external probe. The value R t is appropriate for each of these two cases. Switching on R t at the start of a reduction sequence as well as switching it off at the end of the sequence can be done gradually, the resistance taking its limit value Rt only slowly. first case above, the limit value Rt is reached from a very high initial value Ro, decreasing progressively until the value Rt. In the second case, Rt starts from a zero value reaches its limit value Rt by increasing values. In this way, the E onomiser acts smoothly and in harmony with all the existing installations.

Depending on the outside temperature conditions, Rt can take values such that the reduction in heating can take all the values from OX to '100X, i.e. can range from zero action in very cold weather to total closure when the Temperatures are sufficiently lenient. In the latter case, this closure occurs not only gradually, but it takes place on a heating which has already been very slowed down by the normal play of conventional regulation.

The classic regulator supplemented by the Economizer, object of this
invention, reacted to the fictitious increase in outside temperature created by
the Economizer and automatically reduces the heating according to the programmed sequences.

By way of nonlimiting example, a device has been shown on board one,
Fig. 1 represents a conventional regulation (1). A 3-way valve (2) allows
obtain in (3) hot water going to the radiators at a temperature
suitable by mixing the primary hot water in variable proportions (4) and
return water from the radiators (5). The regulator (1J receives the information
outside temperature (7) and temperature at the start of the fluids (6). Her-
operating law is represented by the inclined curve of the diagram.

Whenever the temperature at the start of the fluids differs from the temperature
desired by the regulator, the latter actuates the 3-way valve to remove
this difference and therefore maintain at the start of the fluids the temperature predicted by the
regulator curve.

Fig. 2 shows an example of a device according to the invention.
the regulator's external probe is interrupted and passes through the device, the
contact being maintained normally outside the breaking sequences. La =
one of the branches of a wire bridge is the external Economiser probe (12). The cursor (wire) is automatically positioned on the right AB-which is a temperature scale in order to constantly balance the bridge. The cursor is
do a stop (13) on a resistance wire CD. For each outdoor temperature
lower, this stop takes a determined position. When the clock (10)
requests the start of a saving sequence, the motor (9) moves the cursor (f)
from position D, at reduced speed to the stop (13). Arrival (13) on the stop, the entire resistance Rt has been added to the resistance of the probe
of the classic regulator.

When the clock (10) requests the end of the sequence, the motor gradually brings back the cursor (83 in D and the heating thus gradually resumes-its value predicted by the only conventional regulator
Another exemplary embodiment consists in that the heating reduction program is written on a disc secured to a clock movement.

The program corresponding to a temperature is written on a circumference and the entire program for all temperatures of the useful scale is found on the surface of the disc. Just read for each temperature on the corresponding circumference.

It is a transparent disc whose parts corresponding to the economy program have been blackened. Reading is done by a Beletro crew
optical, a luminous slit acting on a photoelectric cell -when the part of the disc which separates them is transparent.
shown by way of nonlimiting example in FIG. 3 of plate 2 below, we see for example at 11 pm: no saving program if the outside temperature is below +1; at +1, the saving sequence is 5 minutes; at + 4S, it is 15 minutes; at + 80, it is 30 minutes; at +120, it is 50 minutes; at + 16D, it reaches 4 hours. No sequence is programmed below +1, and at the other end of the scale, the heating is switched off as long as the outside temperature is equal to or higher than +18.

This device can be used alone, in addition to any existing heating installation. It can also be integrated into the device described in fig. 2. In this case, the automatic reading cursor for outside temperature (11) can advantageously be unique and drive both the stop (13) and the device for reading the disc.

Claims (10)

of a watch movement. The value of this correction is a function of the outside temperature, it takes place during the duration of the sequences planned.  either by a clockwork device, or written on an integral disc  i - Energy saving process for additional heating of conventional regulators characterized in that it corrects the input information to this regulator: either the outside temperature information, or the temperature information at the start of the fluids, or both. This correction is scheduled The amplitude of the reduction goes from 0% in extreme cold to 100% when the outside temperature allows it. 2 - Method according to claim -1- characterized in shell the device is partially or completely electronic. 3 - Method according to the claims above characterized in that the beginning and / or the end of this reduction is carried out gradually. 4 - Method according to the above claims characterized in that the value of the reduction involved depends on the following parameters taken individually or in combination: outdoor temperature, wind speed, humidity, sunshine. 5 - Method according to the above claims, characterized in that the kinetics of implementation of the limit value of the reduced is either predetermined, or a function of one or more parameters listed in claim -4-. By "implementation" is meant both the start process and the end process of saving sequences.  6 - Method according to the claims above characterized in that the reduction sequences are programmed by one or more clock devices or all  other electronic device such as a microsystem. 7 - Method according to the above claims, characterized in that the device is autonomous and complements conventional regulation. 8 - Method according to the claims above, characterized in that the device is integrated in a heating regulator, that is to say in addition to the conventional "reduced",  be integrated into this reduction itself to make it variable according to a process  automatic. 9 - Method according to the preceding claims, characterized in that the pro  gram memorized by the clock device is itself automatically modified according to one or more of the parameters listed in claim -4 -. 10 - Method according to all of the claims - 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 and 9 characterized in that the corrective action is obtained by an actual heating of the outside temperature probe and probe using this process.