WO2017163152A1

WO2017163152A1 - System and method for cleaning a filter of a swimming pool

Info

Publication number: WO2017163152A1
Application number: PCT/IB2017/051495
Authority: WO
Inventors: Daniele PAVAN
Original assignee: Pavan Daniele
Priority date: 2016-03-25
Filing date: 2017-03-15
Publication date: 2017-09-28
Also published as: ITUA20162039A1

Abstract

A system (1, 10) for cleaning the filtration means of a swimming pool (2, 2'), a circulation circuit (6, 6') of the hot water of the swimming pool (2, 2'), a water-integration duct (8, 62, 62') entering the circuit (6, 6'), heating means (68, 68') and filtration means (42, 42') of the water of the circulation circuit (6, 6'), and heat recovery means (12) of the hot water coming out of the circuit (6, 6'), configured to transfer at least part of the heat to the integration water entering the circuit (6, 6'). The system also comprises a storage tank (40) placed downstream of the heat recovery means (12) to receive the cold water coming out of the latter. Such a tank (40) and the filtration means (42, 42') are reversibly connectable in fluidic manner, so that the cold water is used to wash or regenerate the filtration means (42, 42' ). A method of cleaning the above system is also disclosed.

Description

DESCRIPTION

"SYSTEM AND METHOD FOR CLEANING A FILTER OF A SWIMMING

POOL"

[0001] The present invention relates to a system and a method for cleaning the filters of one or more swimming pools .

[0002] A pool of known type, such as outlined in figure 4, comprises a main tank (A) for bathers, and a secondary tank (B) that receives water from (and returns water to) the main tank through a series of pipes (C, D) . The water temperature in the tanks above therefore is substantially the same, and it is usually relatively hot water (i.e. above ambient temperature) to provide some comfort for bathers .

[0003] Placed between the two tanks is provided at least one filter (E) , which provides for maintaining the cleanliness of water inside the tanks.

[0004] It is also known that, periodically, the filter itself should be cleaned in order to ensure proper functioning of the system.

[0005] In this regard, a common solution is that the water used for cleaning comes from the secondary tank (B) and that, downstream of the filter, such a water is drained as wastewater as it is no longer usable.

[0006] This system is however disadvantageous under the thermal profile.

[0007] More precisely, the known system wastes a considerable amount of hot water, which comes from the main tank for cleaning. Inevitably, the hot water must then be replaced by an at least equal volume of cold main water, which will obviously be heated before being introduced into the main tank, resulting in a thermal burden to the entire system.

[0008] The present invention falls within the above context by aiming to provide a system and a method able to overcome the drawbacks of the prior art. More specifically, the present system and method use cold water for cleaning the filter and, in particular, originally hot water of the circulation circuit whose calorific value is transferred to an incoming integration water flow.

[0009] This object is achieved by a system according to claim 1 and by a method according to claim 17. The dependent claims describe preferred or advantageous embodiments.

[0010] The present invention will now be described with the aid of the accompanying drawings, in which:

[0011] - figure 1 shows a schematisation of a system object of the present invention, according to a first embodiment; [0012] - figure 2 shows a schematisation of a system object of the present invention, according to a different embodiment ;

[0013] - figure 3 shows a detail of the recovery means shown in figure 1 and 2, according to a possible variant;

[0014] - figure 4 schematises a swimming pool which does not fall within the present invention, according to the prior art.

[0015] With reference to the accompanying drawings, reference numerals 1, 10 denote, as a whole, a system for cleaning the filtration means of a swimming pool.

[0016] This system comprises at least one swimming pool 2, 2', at least a circulation circuit 6, 6' of the hot water of the pool 2, 2' and a water-integration duct 8, 62, 62' entering such a circuit 6, 6' .

[0017] Figure 1 shows a possible variant of the simpler system with a single swimming pool 2. Figure 2 schematises a different variant of the system with a pair of swimming pools 2, 2' .

[0018] The system object of the present invention may, however, provide for a number of pools greater than two, such as shown by the dashed lines indicated with reference numerals 50, 52, 54 in figure 2.

[0019] Therefore, the circulation circuit 6, 6' is connected to pool 2, 2' both upstream and downstream, so as to achieve a recirculation of at least part of the hot water contained in the pool.

[0020] It should be noted that in the present description, the terms "upstream" and "downstream" refer to the flow directions Tl, T2, T3, T4, T5, T6, T7, T8, T9 of water applicable each time.

[0021] Additionally, the terms "hot water" and "cold water" should be understood with an only relative meaning. As a result, the so-called hot water will refer to hotter water than the so-called cold water.

[0022] Purely by way of example, cold water could have a temperature of about 7-15°C and/or hot water could have a temperature of about 25-35°C.

[0023] Preferably, system 1 comprises a plurality of different circulation circuits 6, 6' for each pool.

[0024] Going in more detail, at least a first duct 56, 56' receives water from pool 2, 2' to feed an optional compensation tank 4, 4'. Fluidically downstream of such a tank, the system preferably comprises at least a second duct 58, 58' which returns at least part of the water to pool 2, 2', thus implementing said recirculation.

[0025] At least one water subtraction duct 60, 60' preferably branches off from the second duct 58, 58', that subtracts part of the water of the circulation circuit 6, 6 ' . [0026] The system 1, 10 further comprises heating means 68, 68' and filtration means 42, 42' of the water of the circulation circuit 6, 6' which are advantageously placed along the latter, and recovery means 12 of the heat of the hot water coming out of circuit 6, 6' .

[0027] The heating means 68, 68' advantageously are in thermal contact with the water of the circulation circuit 6, 6' for a fine adjustment of the hot water temperature, for example (immediately) upstream of its re-introduction into pool 2 , 2 ' .

[0028] According to different embodiments, the filtration means 42, 42' could be configured to retain solid materials (e.g. hair) and/or to reduce bacterial loads possibly transported in such a circuit. The filtration means 42, 42' may therefore specifically comprise one or more filters or grids and/or one or more activated carbon filters .

[0029] The heat recovery means 12 are configured to enable the transfer of at least part of the heat of the hot water in circuit 6, 6' to the integration water entering circuit 6, 6' through said duct 8, 62, 62'.

[0030] In other words, the recovery means 12 are designed to recover the heat from the hot water, yielding such a heat to the cold integration water entering circuit 6, [0031] According to different embodiments, the recovery means 12 could comprise a heat exchanger 76, a heat pump 78, 80, 82, 84 or combinations thereof. In particular, the heat exchanger 76 may be static, with heat pipe or a heat exchanger combining such systems.

[0032] Advantageously, the water integration duct 8, 62, 62' conveys integration water to pool 2, 2', also to integrate the water that is physiologically lost from the circuit. For example, the water may be lost due to external factors such as - just to name a few evaporation, removal of water by the bathers, generation of waves that cause spills from the pool, circulation circuit losses or the like.

[0033] Preferably, the recovery means 12 are placed along the fluidic path of the water integration duct 8, 62, 62 ' , so that such means receive integration water which, with respect to the flow direction T5, T6, will be cold upstream (as it is mains water) and will become hot downstream due to the heat transfer which occurs in such means .

[0034] System 1, 10 also comprises at least one storage tank 40 placed fluidically downstream of the heat recovery means 12 to receive the cold water coming out of the latter.

[0035] Therefore, the water that has cooled in the recovery means 12 is transferred to the storage tank 40, whose function will be clarified hereinafter.

[0036] Specifically, a third duct 64 connects a cooled water outlet of the recovery means 12 and the inner compartment of the storage tank 40.

[0037] According to a preferred variant, the storage tank 40 is open, for example on the upper side, to allow gas exchange (specifically air or other gases, possibly dissolved in the water, particularly chlorine) between the inside and the outside of such a tank.

[0038] According to the invention, the storage tank 40 and the filtration means 42, 42' can be reversibly connected (specifically: through first interception means 22 that allow/prevent such a connection depending on the circumstances), in a fluidic manner, so that such cold water is used for washing or for the regeneration - for example periodical - of the above means 42, 42'.

[0039] In the embodiments shown, the storage tank 40 is connected to the filtration means 42, 42' through a fourth duct 66, 66', which develops therebetween. Preferably, the first interception means 22 are placed along such a fourth duct 66, 66'.

[0040] Therefore, innovatively, the cooled water in the recovery means 12 can be usefully reused for cleaning or regenerating the filtration means, before being optionally discharged through at least one discharge mouth 70, 70' of system 1, 10.

[0041] According to an advantageous variant, the filtration means 42, 42' are crossed by the water of the circulation circuit 6, 6' in a first direction (i.e. from top to bottom) , and are crossed in counter-current (with respect to such a first direction; for example, from bottom to top) by the cold water coming from the storage tank 40 or in the washing or regeneration operations.

[0042] The recovery means 12 are supplied with hot water from the circulation circuit 6, 6' through said water- subtraction duct (60, 60') which, according to a particularly advantageous embodiment, detaches from the circulation circuit 6, 6' in a point P3 downstream of the filtration means 42, 42', with respect to the flow direction T3 of water.

[0043] According to the variant shown, the inlet point PI, P2 of the water integration duct 62, 62' in the circulation circuit 6, 6' is placed fluidically downstream (with respect to direction T3) with respect to point P3, P4 from which the water subtraction duct 60, 60' detaches.

[0044] According to a variant, system 1, 10 may comprise first interception means 18, 18, 22, 22' associated with the circulation circuit 6, 6' (for example arranged upstream and/or downstream of the filtration means 42, 42') and/or with a duct 66, 66' which develops between the storage tank 40 and the filtration means 42, 42', allowing the cold water or hot water to flow through the filtration means 42, 42'.

[0045] As discussed above, a preferred variation of the present system provides that the hot water and the cold water flow through the filtration means 42, 42' mutually in counter-current (but at different moments in time) . Such a flowing direction is specifically managed by the first interception means 18, 18', 22, 22' just discussed.

[0046] According to a preferred variant, the first interception means 18, 18, 22, 22' could be controlled through control means 36 of system 1 described herein, such means 36 for example being electronic.

[0047] According to a possible variant, each pool 2, 2' comprises its own independent filtration means 42, 42'.

[0048] According to the embodiment shown in figure 3, the recovery means 12 may comprise at least one heat exchanger 76 in which heat is transferred from the hot water coming out of circuit 6, 6' to the integration water entering circuit 6, 6' and at least one heat pump 78, 80, 82, 84.

[0049] With regard to the latter, the heat pump preferably comprises a condenser 78 and an evaporator 82 respectively supplied through the cold water coming out of the heat exchanger 76 (which thus acts as a refrigerant in condenser 78), and through the hot water coming out of exchanger 76 (which acts as heating fluid in evaporator 82) .

[0050] According to an advantageous embodiment, the heat pump 78, 80, 82, 84 may comprise a compressor 80 and an economiser 84, the latter located downstream of evaporator 82 to exchange therein the heat between the (cold) water coming out of evaporator 82 and the (hot) water coming out of compressor 80.

[0051] Advantageously, the cold water coming out of economiser 84 is conveyed to the storage tank 40 while, according to a further embodiment, the hot water coming out of economiser 84 can be conveyed to the circulation circuit 6, 6', preferably passing through condenser 78.

[0052] Preferably, system 1, 10 comprises at least one compensation tank 4, 4', circulation means 4, 14', 16, 20 and/or second interception means 72, 74 and at least one electronic monitoring unit 26.

[0053] The compensation tank 4, 4' is placed fluidically in output from the swimming pool 2, 2' or plurality thereof, so as to be able to buffer any fluctuations in the flow of hot water to the heat recovery means 12.

[0054] In the embodiment shown in figure 1, the filtration means 42, 42' are arranged between the compensation tank 4, 4' and the second duct 58, 58'.

[0055] As regards the circulation means 14, 14', 16, 20 and/or the second interception means 72, 74, such means may be associated with the circulation circuit 6, 6', with the water-integration duct 8, 62, 62' and/or optionally with the water-subtraction duct 60, 60', to regulate the flow of water supplied to the heat recovery means 12.

[0056] According to a particularly advantageous aspect of this embodiment, the transit of fluid to the recovery means can in fact be adjusted variably, according to one or more predefined parameters, as better discussed hereinafter .

[0057] The flow rates of water to the recovery means 12 can therefore be adjusted by intervening on the circulation means (in particular by increasing or decreasing the flow rate) , and/or by restricting/increasing the transit sections in the system ducts, at the interception means.

[0058] According to a variant, the circulation means 14, 14', 16, 20 comprise one or more pumps.

[0059] According to further variants, the interception means - first 18, 18', 22, 22' and/or second 72, 74 - may comprise one or more ( electro- ) valves .

[0060] For example, each pool may comprise its own independent heating means 68, 68'. [0061] Preferably, the heat recovery means 12 are distinct from the heating means 68, 68'.

[0062] According to possible embodiments, the heating means 68, 68' may comprise a heat pump, an electric resistor, a heat exchanger or combinations thereof.

[0063] According to an embodiment, the electronic monitoring unit 26 comprises temperature detection means 28, 30 and detection means 32, 34, of the water flow 32, 34 through the recovery means 12, and control means 36 configured to receive measurement signals from the temperature detection means 28, 30, and from the flow detection means 32, 34.

[0064] For example, the temperature detection means 28, 30 and/or the flow detection means 32, 34 comprise one or more temperature transducers and/or one or more flow transducers .

[0065] According to a preferred variant of the invention, the control means 36 are also configured to process control signals for the second interception means 72, 74 and/or the circulation means 14, 14', 16, 20 based on the measurement signals, so that the flows of hot water and cold water supplied to the recovery means 12 are selectable according to at least one predefined parameter.

[0066] It follows that, according to this variant, the system is designed not only to control the flows of water in circulation, but also to improve or optimize the recovery of heat from the hot water entering/coming out of circuit 6, 6' regardless of changes in pressure and flow rates within the system.

[0067] By way of example, the predetermined parameters could comprise a level of hot water in the compensation tank 4, 4' within a predetermined range, a number of users of the swimming pool 2, 2', an index of cleanliness of the water in the swimming pool 2, 2', a minimum and/or maximum flow rate of integration-water, a concentration of a reference substance in the water (such as chlorine) or combinations thereof.

[0068] According to a particularly advantageous variant, the measurement signals and the control signals of said means 36 are generated continuously.

[0069] According to the variant shown in the figures, each pool 2, 2' is provided with its own compensation tank 4, 4' and/or its own filtration means 42, 42'.

[0070] According to a further variant, a plurality of pools may share a common storage tank 40 to carry out the above washing/regeneration operations.

[0071] Preferably, system 1, 10 comprises level measuring means 38, 38' of the water in the compensation tank 4, 4'. According to such a variant, the control means 36 are configured to process the control signals for the second interception means 72, 74 and/or for the circulation means 14, 14', 16, 20 based on signals received from the level measuring means 38 , 38', in order to keep the level in the compensation tank 4, 4' within a predetermined range of values.

[0072] According to a preferred variant, the control means 36 are configured to process control signals for the second circulation means and/or the first interception means so as to start/stop the washing or the regeneration of the filtration means based on the heat exchange to the recovery means 12, or to start/stop the heat exchange to the recovery means 12 according to the washing or the regeneration of the filtration means.

[0073] Optionally, system 1, 10 comprises second level measuring means 44 of the water in the storage tank 40. According to a preferred embodiment, the control means 36 are configured to process the control signals for the second interception means 72, 74 and/or for the circulation means 14, 14', 16, 20 based on signals received from the second level measuring means 44 in order to keep the level in the storage tank 40 within a predetermined range of values.

[0074] As regards the level measuring means 38, 38', 44, such means may comprise one or more level tranducers and/or one or more immersion probes. [0075] As regards the variants comprising a plurality of pools 2, 2', the latter may be associated with common recovery means 12.

[0076] Advantageously, the pools 2, 2' may be mutually connected in parallel.

[0077] According to a particularly advantageous variant, the pools 2, 2' communicate with the recovery means 12 through a first manifold 46 and a second manifold 48 which, respectively, are fluidically placed downstream and upstream of the recovery means 12, with respect to the hot and cold water outlet directions from the latter (specifically corresponding to the flow directions T5 and T7, respectively in the accompanying figures) .

[0078] Preferably, the control means 36 are single for processing control signals for the second interception means 72, 74 and/or for the circulation means 14, 14', 16, 20 of the plurality of swimming-pools 2, 2', based on said measurement signals.

[0079] According to an embodiment, the control signals for a specific pool 2 are separate and independent of the control signals of the other pool 2' or plurality of other swimming-pools.

[0080] According to a further embodiment, the system comprises a remote supervision station (not shown) , such as a remote computer. [0081] The electronic monitoring unit 26 may therefore comprise communication means 24 (for example wireless, wired or radio) with the remote supervision station to transmit the measurement signals and/or to receive from the latter second command signals for the second interception means 72 , 74 and/or for the circulation means 14, 14', 16, 20.

[0082] In other words, the system just described does not need to be monitored on site but it may be controlled from another place by an operator. A single operator may even perform a supervision of a plurality of different systems 1, 10 without having to physically intervene to make any of the adjustments just discussed.

[0083] Said object is also achieved by a method for cleaning the filtration means of a swimming pool as described hereinafter.

[0084] Preferably, such a method can be implemented through system 1, 10 according to any one of the preceding embodiments .

[0085] It follows that, even where this is not expressly stated, this method may comprise any preferred or accessory feature deductible - from a structural point of view - from the description above.

[0086] This method comprises at least one step of reversibly fluidically connecting the storage tank 40 and the filtration means 42, 42' so that the cold water is used for washing or regeneration - e.g. periodic - of said filtration means 42, 42'.

[0087] Innovatively, the invention described is able to overcome the above drawbacks of the prior art.

[0088] In particular, the system and the method object of the present invention allow washing or regenerating the filtration means with cold water, not with hot water whose residual heat can still be used for heat exchange with the cold water coming from the outside.

[0089] This results in considerable energy savings.

[0090] Advantageously, the system and the method object of the present invention are suitable for regulating the flow of water to the heat exchange means, regardless of any changes in pressure or volume of fluid within the system, in a substantially automated manner.

[0091] Advantageously, the system and method object of the present invention thus allow recovering the heat in a considerably more efficient manner than the known systems, or in an optimal manner in an absolute sense.

[0092] Advantageously, the system and method object of the present invention allow intervening on the system even remotely, i.e. without an operator having to physically make adjustments on the system.

[0093] Advantageously, the system and method object of the present invention thus allow defining the parameter that will serve as the motor for the adjustments discussed above as desired.

[0094] Advantageously, the system object of the present invention is able to handle any fluctuation to the compensation tank.

[0095] Advantageously, the system and method object of the present invention are able to handle any water leaks from the circuit without forcing a stoppage of the circulation of the various flows, of course within certain limits.

[0096] Advantageously, the system and method object of the present invention are able to manage different pools through common equipment, but nevertheless maintaining an independence of adjustment for each of them.

[0097] Advantageously, the system and method object of the present invention allow recording the water flow rates, thermal and electrical flows and/or recovery performance values of the recovery means.

[0098] Advantageously, the system and method object of the present invention allow effectively managing both the thermal exchange and the washing of the filtration means, without any of those operations adversely affecting the other .

[0099] Advantageously, the system and method object of the present invention use, for washing the filtration means, water with a high level of cleanliness, higher than normal mains water.

[00100] More precisely, with the system described herein, the washing of the filtration means is carried out with water having higher hygiene properties than any traditional system or method.

[00101] In fact, during the wash cycle of traditional systems (figure 4), the filter receives incoming water sucked from the dirtiest and most polluted point of the plant, downstream of the pool, namely from the secondary tank (B) mentioned at the beginning. It should be noted that such inlet in the filter when washing corresponds to the cleanest point of the filter during the operating cycle, from which filtered water comes out.

[00102] Even using mains water for the wash cycle there would not be any guarantee of cleanliness or hygiene, besides causing disastrous consequences in terms of energy .

[00103] According to the present invention, the water used for washing the filtration means has the same quality as that circulating in the circuit, which is the water with the maximum level of cleanliness within the system.

[00104] For this reason, it is particularly advantageous to collect the water for the storage tank immediately downstream of the filtration means, because otherwise the water used in the wash cycle would be loaded with fat, bacteria, hair and other dirt, ordinarily present in a pool.

[00105] Advantageously, the system and method object of the present invention are designed to increase the level of cleaning of the filter, because the water used for cleaning or regeneration comes already clean where the filter is less polluted.

[00106] According to a further advantageous aspect, the storage tank also acts as a settling tank which, according to the regulations in force, is required to evaporate the chlorine in excess contained in the pool or in the plurality of them.

[00107] Specifically, the presence of the storage tank allows obtaining an interesting constructive economy because in addition to having a central role in the discussed cleaning of the filters, such a tank also serves to meet the discharge requirements required for pool installations in terms of "settling". The aforementioned tank in fact allows the evaporation of chlorine from water, in excess of what is specified by law .

[00108] Advantageously, the recovery means are designed to reduce the refrigerant enthalpy jump when the latter expands in the evaporator. This condition therefore increases the refrigerating effect (calculated to be about 20-25%) without increasing the power consumption of the compressor.

[00109] A man skilled in the art may make several changes or replacements of elements with other functionally equivalent ones to the embodiments of the above system and method in order to meet specific needs.

[00110] Also such variants are included within the scope of protection as defined by the following claims.

[00111] Moreover, each variant described as belonging to a possible embodiment may be implemented independently of the other variants described.

Claims

1. System (1, 10) for cleaning filtrations means of a swimming pool comprising:

- at least one swimming pool (2, 2') ;

- at least one circulation circuit (6, 6') of the hot water of the pool (2, 2') and a water-integration duct (8, 62, 62') entering said circuit (6, 6') ;

- heating means (68, 68') and filtration means (42, 42') of the water in the circulation circuit (6, 6 ' ) ;

- heat recovery means (12) of the hot water coming out of the circuit (6, 6'), configured to allow transfer of at least part of said heat to the integration-water entering the circuit (6, 6') through said duct (8, 62, 62') ;

at least one storage tank (40) placed fluidically downstream of the heat recovery means (12) to receive the cold water coming out of the latter;

wherein the storage tank (40) and the filtration means (42, 42') are reversibly connectable in fluidic manner, so that said cold water is used to wash or regenerate - e.g. periodically - said filtration means (42, 42 ' ) .

2. System according to the preceding claim, wherein the heat recovery means (12) are distinct from the heating means ( 68 , 68 ' ) .

3. System according to any of the preceding claims, wherein the heat recovery means (12) are supplied with hot water from the circulation circuit (6, 6') through a water-subtraction duct (60, 60') which, with respect to the flow direction (T3) of the water, detaches from the circulation circuit (6, 6') in a point (P3) downstream of the filtration means (42, 42') .

4. System according to any of the preceding claims, wherein the cold water has a temperature of about 7-15°C, and wherein the hot water has a temperature of about 25- 35°C.

5. System according to any of the preceding claims, comprising first interception means (18, 18', 22, 22') associated with the circulation circuit (6, 6') and/or with a duct (66, 66') which extends between the storage tank (40) and the filtration means (42, 42'), to allow cold water or hot water to pass through the filtration means (42, 42'), for example reciprocally in counter- current .

6. System according to any of the preceding claims, optionally when dependent on claim 3, comprising:

- at least one compensation tank (4, 4') placed fluidically in output from the swimming-pool (2, 2') or plurality thereof, so as to be able to buffer any fluctuations in the flow of hot water to the heat recovery means ( 12 ) ;

- circulation means (14, 14', 16, 20) and/or second interception means (72, 74) associated with the circulation circuit (6, 6'), with the water-integration duct (8, 62, 62') and/or optionally with the water- subtraction duct (60, 60') , to regulate the flow of water supplied to the heat recovery means (12);

an electronic monitoring unit (26) comprising temperature detection means (28, 30) and detection means (32, 34) of the flows of water through the heat recovery means (12), and control means (36) configured to receive measurement signals from the temperature detection means (28, 30) and from the flow detection means (32, 34), and to process control signals for the second interception means (72, 74) and/or for the circulation means (14, 14', 16, 20) based on said measurement signals, so that the flows of hot water and cold water supplied to the heat recovery means (12) are selectable according to at least one predetermined parameter.

7. System according to the preceding claim, wherein the predetermined parameters comprise a level of hot water in the compensation tank (4, 4') within a predetermined range, a number of users of said swimming-pool (2, 2'), an index of cleanliness of the water in the swimming-pool (2, 2'), a minimum or maximum flow rate of integration- water, a concentration of a reference substance in the water, or combinations thereof.

8. System according to any of the claims 6-7, comprising level measuring means (38, 38') of the water in the compensation tank (4, 4'), and wherein the control means (36) are configured to process the control signals for the second interception means (72, 74) and/or for the circulation means (14, 14', 16, 20) based on signals received from the level measuring means (38 , 38'), in order to keep the level in the compensation tank (4, 4') within a predetermined range of values.

9. System according to any of the claims 6-8, comprising second level measuring means (44) of the water in the storage tank (40), and wherein the control means (36) are configured to process the control signals for the second interception means (72, 74) and/or for the circulation means (14, 14', 16, 20) based on signals received from the second level measuring means (44), in order to keep the level in the storage tank (40) within a predetermined range of values.

10. System according to any of the preceding claims, comprising a plurality of swimming-pools (2, 2') associated with common heat recovery means (12), said swimming-pools (2, 2') being mutually connected in parallel and communicating with said means through a first manifold (46) and a second manifold (48) placed fluidically downstream and upstream of said means (12), relative to the output direction of the hot and cold water from the heat recovery means (12) .

11. System according to the preceding claim, comprising single control means (36) for processing control signals for the second interception means (72, 74) and/or for the circulation means (14, 14', 16, 20) of said swimming- pools (2, 2') , based on the measurement signals.

12. System according to claim 10 or 11, wherein the control signals for a specific pool (2) are separate and independent of the control signals of the other pool (2') or plurality of other swimming-pools.

13. System according to any of the preceding claims, comprising a remote supervision station, and wherein the electronic monitoring unit (26) comprises communication means (24), for example wireless, wired or radio, with said remote supervision station to transmit the measurement signals and/or to receive from the latter second command signals for the second interception means (72 , 74) and/or for the circulation means (14, 14', 16, 20) .

14. System according to any of the preceding claims, wherein the heat recovery means (12) comprise at least one heat exchanger (76) in which the transfer of heat from the hot water coming out of the circuit (6, 6') to the integration-water entering the circuit (6, 6') is performed, and at least one heat pump (78, 80, 82, 84) comprising a condenser (78) and an evaporator (82) respectively supplied by the cold water coming out of the heat exchanger (76) which acts as a refrigerant fluid in said condenser (78), and by the hot water coming out of said heat exchanger (76) which acts as a heating fluid in said evaporator (82) .

15. System according to the preceding claim, wherein the heat pump (78, 80, 82, 84) comprises a compressor (80) and an economiser (84), the latter placed downstream of the evaporator (82) to exchange therein the heat between the water coming out of the evaporator (82) and the water coming out of the compressor (80), the cold water coming out of said economizer (84) being conveyed to the storage tank (40), the hot water coming out of said economizer (84) being conveyed to the circulation circuit (6, 6') through said condenser (78) .

16. System according to any of the preceding claims, wherein the storage tank (40) is open so as to allow a gaseous exchange between the inside and outside of said tank, and wherein said tank acts as a settling tank to evaporate the excess chlorine contained in the swimming- pool or in the plurality thereof.

17. Method for cleaning the filtration means of a swimming pool, implemented through the system (1, 10) according to any of the preceding claims, comprising at least one step of reversibly fluidically connecting the storage tank (40) and the filtration means (42, 42') so that said cold water is used for washing or regeneration - e.g. periodic - of said filtration means (42, 42 ' ) ·