ES2344822B1 - WATER SAVING AND FUEL SYSTEM IN WATER HEATING. - Google Patents

Abstract

Water and fuel saving system in the water heating With this system, the loss of water that is discarded by requiring hot water in the shower, kitchen and other taps, being applicable mainly in boilers and domestic heaters.

The system makes when you open the water tap hot initially do not leave water, but instead a temporary recirculation through the heater, by setting in operation of a small pump placed between the water intakes hot and cold When the desired temperature is reached in the hot water outlet, the pump is stopped and a solenoid valve that lets water through the faucet.

In addition, this system saves the fuel needed to heat the water that is discarded before Reach the required temperature.

Description

Water and fuel saving system in the water heating

Technical sector

The invention is in the referred sector to drinking water consumption, more specifically to the systems of water savings in domestic buildings, as well as in the sector of fuel savings.

State of the art

Given the increasing sensitivity due to the shortage of water, there are many inventions related to saving water in residential buildings, mostly referred to the reuse of wastewater or water savings in bathroom cisterns. With this invention is able to save much of the water that is discarded from when a hot water tap is opened until the Water at the desired temperature.

Boilers are currently installed that keep the heating circuit constantly warm or incorporate an accumulator for immediate water supply hot. The drawback of these systems is that they require keep several liters of hot water permanently, with the consequent consumption of gas, diesel or electricity.

This system has the advantage that it can be applied to new heater models or installed in networks sanitary ware already in operation, integrating the different elements that make it up between the heater itself and the hot water network of housing.

Detailed description of the invention

The present invention relates to the incorporation of a new system in boilers or in the network sanitary, which consists of recirculating water through the heater until it reaches the desired temperature.

The system consists of a thermostat (1) installed at the outlet of the hot water that has a closed contact to low temperature and acting in switching with another normally open when the water reaches a certain temperature. This thermostat can act at a set fixed temperature or variable.

In line with the thermostat a solenoid valve (4) and a pressure switch (5) with a contact normally open when there is pressure in the pipe. When you open any of the hot water taps of the installation (shower, sink, sink ...) pressure loss occurs in the pressure switch that causes the contact to close (7), starting a small pump (3) placed between hot and cold water intakes, such as It is shown in figure 1.

When the pump is started, it does recirculate the water through the heater coil until it is turn on and heat the water to the temperature set in the thermostat (1). At that time, the thermostat switches the contact normally open to closed (6), and acts on the solenoid valve giving way to hot water to the faucet, while making the pump stops, as represented in the electrical circuit of Figure 2

The electrical wiring between the different system elements is represented by dashed lines in Figures 1 and 3.

A valve is installed next to the pump (3) non-return (2) or a solenoid valve activated simultaneously with the pump, so as to prevent the passage of water between the sockets of hot and cold water without going through the heater.

When the shower or water tap is closed again hot, it returns to the initial situation, with the particularity of that now the solenoid valve (4) remains open, since the water in the thermostat (1) it stays warm, so if after a short time any water tap opens again hot recirculation will not occur through the boiler, but the hot water will go directly to the faucet as if This system was not installed.

The solenoid valve (4) will close again when the water temperature drops to the level set in the thermostat. At this time the switching of their contacts (6) without this starting the pump, since the Pressure switch contact (7) remains open since it occurred Hot water shutdown.

Every time we open the shower or a water tap hot, starting from a low temperature in the water circuit sanitary, there is a saving of several liters of water that varies depending on the model and the age of the heater. This water saved It is the one that would be lost when opening the tap and waiting for hot water. By incorporating this water saving system in the heater or in the sanitary network also saves fuel, since not only wastes cold water, but hot water is also wasted with a lower temperature than desired, as well as the required energy for warm up This use of temperate water makes also reduce the time in which water is available hot.

The described system can be incorporated internally in boilers or hot water heaters, or marketed in a separate kit (9), as shown in Figure 3. In the latter case, the system is sandwiched between the boiler and the sanitary network, installing it under or next to the heater and connecting the mouths A and B between the cold water outlets (Healing and heater) using two hoses and mouths C and D between the hot water by two others.

Regardless of the protections of safety that incorporate hot water boilers, this system has protection for cases in which they arise anomalous situations, such as a heater fault, of any of the elements of this system, or other situations that They can let the pump run longer than required. This protection consists of incorporating a timer in parallel with the pump, with a normally closed contact (8) that has interlocking in its opening, so that if more time elapses of the necessary so that the water is heated to the marked temperature by the thermostat (1) and the pump is still running, it indicates that An abnormal situation has occurred, and the timer opens the contact (8) stopping the pump. This contact is manually reset once the cause that caused its opening was remedied, either by breakdown, lack of gas, etc.

Between the mouths C and D of Figure 3 you can incorporate a bypass with a stopcock, so if any of the system elements breakdown could be left out of service just by opening this stopcock.

Description of the figures

For a better understanding of the invention, accompany three figures to the present specification that, with illustrative and non-limiting, they present a case of practical application.

Figure 1 shows a complete scheme of the invention between the heater and the water inlets of the installation sanitary Although the system is represented separately from the skull for your greater understanding, this one is mounted inside the body of boiler.

The electrical interconnection between the different System elements are represented in this figure by the dashed lines.

Figure 2 shows the electrical scheme of the system, in which it is observed as the contacts of the thermostat (6), of the pressure switch (7) and the timer (8) act on the solenoid valve and water pump.

Figure 3 shows the different elements of This invention encompassed in a kit (9) that can be marketed independently and installed outside the boiler. The four shots of this kit A, B, C and D are connected between the heater sockets and the one of the sanitary network by means of four hoses.

Claims (4)

1. Water and fuel saving system in water heating, applicable mainly in boilers or gas water heaters for domestic installations. It is characterized by causing temporary water recirculation through the heater coil until it reaches the desired temperature. At that time, the system opens the passage of hot water to the faucet, avoiding both the loss of cold water and that of hot water at temperatures below the required one, with the consequent saving of fuel. The system intercalates at the water outlet heat a thermostat (1) that drives a switch contact (6) to a fixed or adjustable temperature, followed by an electrovalve (4) and a pressure switch (5). Recirculation occurs between the output of the thermostat and the cold water outlet of the heater, using the incorporation of a pump (3) and a non-return valve (2) or solenoid valve that prevents the passage of water between the water intakes Hot and cold without going through the heater. All the elements described in the patent can be installed internally in new models of boilers or heaters being part of these. 2. Water and fuel saving system according to claim 1 characterized by encompassing all the elements contained in the invention in a kit (9), which can be marketed and applied to hot water networks in service, intercalating it between the heater and the water outlets of this one. 3. Water and fuel saving system according to claims 1 and 2, characterized by having a self-protection, by incorporating a timer, which acts by stopping the water pump when anomalous situations occur and the system being reset by manual reset. 4. Water and fuel saving system according to the preceding claims characterized by the possibility of incorporating a bypass between the C and D sockets of the kit (9) with a passageway, so that if there is a breakdown in any of the elements that compose it, the opening of this key would annul the system.