FI72200B - VARMVATTENSBEREDNINGSSYSTEM - Google Patents

Description

1 72200

Scrubbing water production system

The present invention relates to a hot water production system comprising a plurality of interconnected heaters having a cold water inlet and a heated water outlet, the heaters being connected to each other for water flow from the cold water side to the hot water side and the one heater closest to the inlet being connected to the heater located in the circulation wire.

Hot water production systems for multi-family houses, facilities, etc. usually require large hot water heaters that can contain from 1,000 liters to 10,000 liters of water and more. Such heaters are very large units that are installed early on the construction site to be installed in the building itself, which requires careful planning and special control measures during the construction period. Because such heaters have a limited service life, there are also problems when replacing them, as they cannot be removed in the building and placed there as a whole due to their large size. The heaters must therefore be dismantled and assembled on site, which takes a long time and therefore increases costs.

NO patent publication 140 119 discloses a hot water production system comprising a series of interconnected heaters to which a common cold water inlet is connected and which are further connected to a common hot water outlet line by means of separate shut-off valves. In addition, the system comprises means for controlling the position of said valves according to how hot water is to be discharged from the different heaters.

Such a system solves the problem of large units because the various heaters included in the system have such reasonable dimensions that they can be transported in and out of the doorways of modern buildings. However, the known hot water production system, which consists of a number of interconnected heaters, requires a precise balancing between the shut-off valves in question, while the number of valves increases according to the number of heaters installed.

It is an object of the present invention to provide a hot water production system which further has the advantage of consisting of several interconnected heating processes, but in which this interconnection is made so as to speed up and simplify the installation compared to the known system, while significantly reducing the number of valve parts.

Another object of the present invention is to provide a hot water production system, the capacity of which can be easily expanded, not only by heaters comprising heating elements, but also by heaters whose sole purpose is to store preheated water.

According to the invention, these objects are achieved by a hot water production system of the type mentioned at the beginning, characterized in that the circulation line includes a pump controlled by the temperature of the water in the heater closest to the landing point to circulate the heated water from the landing point to the inlet.

I! 3 72200

For example, the pump power can be adjusted according to the water temperature of the heater (landing heater) closest to the landing point.

If one or more heaters closest to the landing point comprise a relatively strong heating source or are connected to such a source which rapidly heats the water of the landing heaters, while each other heating comprises a relatively small heating source or no such source at all, the circulation pump can be controlled for intermittent operation. This means that the pump can be started to circulate hot water from the downheater or to the inlet heater when the downheater water temperature exceeds a certain higher value, after which the cycle is stopped when the downheater temperature has fallen below a certain average, after which the cycle is restarted when the temperature rises. to a higher value.

Such intermittent operation of the pump can simply be implemented with a thermostat that senses the rise in water temperature of the landing heater. Since the circulation only takes place when the water of the landing heater has a high temperature, the excess heat from the landing heater can be transferred to the front-connected heaters and to the tanks, respectively. When a lot of water is drained from the system, the downheater is therefore first drained of ready-to-use water, while being filled with water that has been preheated either by its own residual heat or by other elements installed in the heater.

Preferably, the above system can be extended to also include or be connected to a circulation system for consumers, so that the water heated and heated at the temperature in the heaters can have the same suitable high temperature at all consumer outlets. Thus, a further feature of the present invention 72200 is that a consumer circulation system is connected in parallel with the part of the circulation line located between the landing heater and the circulation pump and that said consumer circulation system comprises a mixing joint for the supply of cold water.

In such a system with a circulation line for leveling the water temperature of the heaters in the system together with a consumer circulation system, a controllable valve can be installed in said part of the circulation line, which opens and closes according to the temperature of the downheater.

It is clear that the circulating power of the pump can be controlled not only by the water temperature of the landing heater but also by the water temperature of the pre-connected heaters and / or tanks, the system comprising one or more heaters comprising a coil for flow-through medium and indirect water heating, and one or more heaters having electrical elements for indirect heating of the heater water.

The invention will be explained in more detail below with reference to the drawings which show embodiments of the present invention.

Figure 1 schematically shows a first embodiment of a hot water production system according to the invention.

Figure 2 schematically shows another embodiment of a hot water production system according to the invention.

The hot water production system according to the invention shown in Fig. 1 comprises a plurality of water heaters and tanks, indicated by the numbers 1-6 in the figure.

Each heater and the tank, respectively, are connected to each other from the top, whereby each heater and the tank, respectively

5 7220Q

comprises an outlet pipe 7 for hot and heated water, respectively, and an inlet line 8 for colder water. The connection between the different heaters and the tanks 1 to 6 is thus made in the embodiment shown by connecting the respective outlet pipes 7 and the inlet pipes 8.

The first heater, namely the heater 1, comprises a coil 9, through which, for example, the boiler water of the heating plant can circulate the water in the heater 1 for indirect heating. Connected to the outlet line 7 from the heater 1 is a hot water line 10, which at the branch point 11 branches to a supply line 12 and a circulating line 13 which, before entering the tank 6, is connected to a cold water line 14 for supplying cold water to said tank. The cold water line 14 includes a non-return valve 14a and a shut-off valve 14b.

The hot water line 10 comprises a shut-off valve 15, a safety valve 16 and a shock absorbing member or a so-called shock cushion 17. A shut-off valve 18 and a non-return valve 19 and a circulation pump 20 are connected to the circulation line 13. thermostat.

Of the other heaters and tanks 2 to 6, respectively, the heater 2 includes a number of electric heating elements 22, and the heaters 3, 4 and 5 also include electric heating elements 23, but these generate less power than the elements 22.

Finally, the system comprises a container or storage part 6, which in the embodiment shown does not include heating elements.

Thus, an essential aspect of the embodiment of the present system shown in Fig. 1 is that the heaters 1-5 and the storage tank 5 are connected to each other for the flow of water from the cold water side, i.e. the water supply side 14, to the hot water side, i.e. the hot water line 10, while mainly the heater 1 at the outlet point is connected to the tank 6 closest to the inlet point by a circulation line 13 comprising a circulation pump 20.

The primary function of the circulation pump is, when the correct water temperature has been reached in the main power section, i.e. tank 1, to transfer hot water to the storage section, i.e. tank 6, and to the front-connected heaters 2-5, while additional water heating is not possible.

In the embodiment shown, the heaters 1-5 and the tank 6 are connected in series, but it is clear that said units can also be connected together in parallel / series.

In the embodiment shown in Figure 1, the pump 20 may be controlled by a thermostat 21, whereby the pump is started to circulate hot water from the heater 1 to the inlet tank 6 when the water temperature in the downcomer exceeds a certain higher value TH, for example 85 ° C. The circulation is stopped when the temperature in the landing tank 1 has fallen below a certain average, for example below 60 ° C, either due to the lowering of the hot water due to the mixing of the cooler water connected upstream via the supply line 12 and the tanks. Since the circulation ceases, hot water with a suitable standby temperature can be continuously discharged from the landing tank 1, and after complete drainage of the hot water from the whole system, the landing tank 1 with its large energy source 9 can supply hot water quickly, but to a limited extent.

When the water temperature TH in the landing tank 1 has been reached again, the water is transferred via the pump 20 to the storage section 6 and to the pre-connected heaters 2-5 until the water temperature in the landing tank 1 has dropped again to the average TM.

The circulation of hot water from the downheater 1 to the heaters connected to the ground means the storage of hot water as well as the preheating of the downstream water before the down tank 1.

If consumption is low over a long period of time, water throughout the system can reach a higher temperatureTM.

In this case, there is no need to heat the water in the heating system, except to cover the heat bill or possibly low consumption. During such a period, the circulation pump operates at the same time as the supply of energy to the heaters is handled by suitable temperature control units adapted to the heaters, which are, for example, of the type described in Norwegian Patent Publication No. 143,082.

Depending on the size of the heaters and the need to drain the water, i.e. if the plant has to be adapted to steady consumption, controlled consumption, etc., the circulation pump 20 can be adjusted other than by means of a thermostat 21. For example, the intensity of the circulation can be adjusted depending on the difference in water temperature of the different heaters and / or the temperature difference between the desired and measured value, depending on whether they refer to the drain heater 1 or a value as a function of other tank temperatures or heat distribution of heaters. of these compared to clean storage inti tanks.

Alternatively, the system shown in Figure 1 may comprise only one electrically heated heater, for example of the type shown in point 2 of Figure 1.

This can then act as a landing tank, while the other tanks can be clean storage tanks without local heating. If only one locally heated heater is used, its position with respect to the landing point can be estimated depending on the operating variations of the system, possibly together with a coil heater of the type shown in point 1 of Figure 1.

Fig. 2 shows a second embodiment of a hot water production system according to the invention, the main parts of which are the same as in the embodiment shown in Fig. 1 and which are denoted by the same reference numerals.

What distinguishes the embodiment shown in Fig. 2 from that described above is that in parallel with the part between the drain heater 1 of the circulation line 13 and the circulation pump 20, namely the line part 13a, a circulating consumer line is connected, hereinafter referred to as consumer circuit 25. a connecting part 26 is connected, to which warm water is supplied from the hot water line 10 and in addition cold water via the line 27. This is connected to the cold water line 14 and comprises a shut-off valve 27a. The consumer circuit 25 includes a shut-off valve 28, a non-return valve 29 and a plurality of consumer outlets 30a, 30b, 30c ... etc.

A controllable valve 31 is mounted in the line 13a between the landing heater 1 and the circulation pump 20, which opens and closes depending on the signals generated by the thermostat 21, which senses the water temperature in the landing heater 1. Otherwise, the line 13a includes a throttle valve 32 in section 13a compared to the flow resistors in the consumer circuit 25.

In the embodiment shown in Fig. 2, the purpose of the control operation is expediently to operate the circulation pump 20 continuously for continuous circulation of ready-to-use hot water via the consumer circuit 25, 72200 is relatively minor and represents a continuous low circulation in the present hot water production system.

However, the main circulation of hot water from the downhill heater 1 to the connected tanks and heaters, respectively, takes place by opening the controlled valve 31 of the line section 13a, whereby the valve can be controlled according to the same criteria as in the embodiment shown in Fig. 1. Thus, the solenoid valve 31 is closed during the heating cycle of the landing heater and does not open until the water temperature has reached a suitably higher value TH.

The circulation pump 20 then circulates the water from the downheater 1 not only through the consumer circulation line 25, but also through the line section 13a, whereby the total amount of circulation water is returned to the system from the storage tank. 6 and through front-connected heaters 2-5.

Due to the hydraulic difference in the consumer circuit and in the line with the solenoid valve 31, the pump water supply increases substantially and causes a rapid transfer of hot water from the power heaters to the storage tanks. During this period, the circuit in the consumer circuit may somewhat stop if the circuits are not balanced very precisely. Such balancing can be accomplished, for example, by adjusting the throttle valve 32 either manually or automatically depending on other operating conditions in which the system must operate. However, since the main cycle can be made short, this does not mean any disadvantage until the entire hot water system is at peak load. When the heaters are at maximum load, the minimum consumer cycle can be particularly small, which is compensated by the high standby temperature.

As can be seen from the two exemplary embodiments above, the primary function of the circulating pump is to transfer hot water to the storage part or parts 10 when the high temperature is reached in the power part or parts.

The pump can possibly be connected to a consumer circulation system for controlling the low water temperature.

The heaters and tanks arranged in the hot water production system can be connected in one series, possibly in series / in parallel, whereby the power components are preferably installed closest to the landing point, thus ensuring the shortest possible heating time of the water components. Thus, after complete emptying, the heaters can sootically re-supply hot water, but to a limited extent.

By combining groups of tanks and groups connected in parallel, a relatively larger heater volume can be obtained with relatively modest pipe diameters. The parallel connection also achieves a continuous supply of hot water even when, for example, the other half of the plant is inoperable. Parallel connection can also provide advantageous water supplies per unit time compared to pure series connection. A certain imbalance between two or more systems connected in parallel can be accepted and possibly adjusted by means of suitable valves.

When a high water temperature has been reached in the landing tanks, the water is transferred via pumps to the first storage section until the water temperature in the power section has dropped to a lower average. The interconnection of the power parts and the storage parts means the storage of hot water as well as the preheating of the low water before the power parts.

The transfer pump can be adjusted in many different ways, depending on the production volumes and the need for the hot water circulation system, including the methods described above.

n 72200

Figure 1 shows in dashed lines an alternative connection of the circulating line 13, which is not connected directly to the cold water line 14 to the tank 6, but to the outlet side 7 of said cold water receiving tank 6. When the circulating line 13, which can conduct relatively high temperature water, is connected in this way, the recycled water is fed to the tank 5 and the cold water is fed to the tank 6. This can then suitably be provided with a coil 9 for circulating a medium from a low temperature heat recovery source, e.g. wastewater, etc., which may have a temperature of about 40 ° C.

The present system thus results in a very efficient combined utilization of high and low temperature heating sources (heat recovery). When using such a combination, the low-temperature element modules must be installed closest to the cold water inlet, whereby the circulation line is connected after the low-temperature heat source modules and in front of the other modules.

The present hot water production system has the following advantages: 1. Due to the similar structure of the heaters and tanks, it is possible to produce them in a production-friendly manner.

2. The simple design and relatively small dimensions of tanks and heaters further reduce manufacturing costs.

3. The relatively small dimensions and weights of tanks and heaters are advantageous when installing in new buildings and especially when replacing older buildings, especially when renovating them.

4. The system is very easily expandable with additional heaters or tanks.

5. The hot water production system combines the storage heaters 12,7200 meters and the high-speed water heaters into one and the same system. This allows the hot water to be completely drained, allowing a suitable amount of water to be heated quickly.

6. The heater system is easy to install because interconnecting different units requires little work, be it for new installations or expansion of existing plants.

7. The system is very flexible, as clean storage tanks and power tanks can be combined into innumerable variations for optimal utilization of heating sources and the lowest possible load on the components in question, while the system guarantees hot water at any time.

When using electrically heated heaters, it is clear that their temperature can be optimally controlled by means of the control system described in Norwegian Patent Publication No. 143,082.

Claims (5)

13 72200 A hot water production system comprising a plurality of interconnected heaters having a cold water inlet and a heated water outlet, the heaters (1-6) being connected to each other (7, 8) for the flow of water from the cold water side (14) to the hot water side (10) and one heater (1) closest to the landing point (10) is connected to a heater (6) close to the inlet point (14 ') by a circulation line (13), characterized in that the circulation line (13) comprises a pump (20) controlled by the temperature of the water in the heater (1) (landing heater) closest to the landing point (10) for circulating the heated water from the landing point to the inlet point. A system according to claim 1, characterized in that the circulation pump (20) is controlled for discontinuous operation, wherein the pump (20) is started to circulate hot water from the landing heater (1) to the initial heater (6) when the water temperature of the landing heater (1) exceeds a certain higher value (TH), and that the circulation is stopped when the water temperature in the circulating heater has fallen below a certain average (TM), after which the circulation is restarted when the temperature rises to a higher value. A system according to claim 1 or 2, characterized in that a consumer circuit (25) is connected in parallel with the part (13a) of the circulation line (13) located between the lower heater (1) and the circulation pump (20) and in that said consumer circuit comprises a mixing connection part (26). ) for the supply of cold water (27). System according to Claim 2 or 3, characterized in that a controllable valve (31) is mounted in the part (13a) of the circulation line (13) between the lowering heater (1) and the circulation pump (20), which opens and closes depending on the water temperature of the lowering heater (1). . 14 72200 System according to one of the preceding claims, characterized in that the circulating power of the pump is controlled not only by the water temperature of the lowering heater (1) but also by the water temperature of the front heaters and / or tanks (2-6). Il 15 72200