ES2277493A1 - Power saving system for hot water use has mixer at which warm water and hot water from boiler arrive through separate conduits - Google Patents

Abstract

The system utilizes the heat from hot water sent to the sewage system after being used in the shower, washbasin, or sink. The hot water flows through a heat exchanger arranged under a battery while cold water flows through an opposing coil. The heat from the hot water permeates the walls of the coil, warming up the cold water. The warm water arrives at a mixer through a conduit while the hot water from a boiler arrives at the mixer through another conduit such that water of a comfortable temperature for the user is obtained.

Description

Energy saving system in the use of water hot.

The present invention relates to a system for thermal energy savings during water consumption hot. With this system you can take advantage of the heat of the water hot that is discarded into the sewer after use in the shower, in the sink, in the sink, with the hose, or in Similar.

The objective of this invention is that energy heat of the used water return to the tap, to the shower, to the hose, ..., to take advantage of it, and let it flow into the sewage only used (dirty) water, but without energy caloric that was extracted.

The advantage of this system is the saving energy and economic at home and in the industry.

Background of the invention

Although there are various savings systems energy in other environments and with another methodology, they are not known systems to harness the heat of hot water that it is discarded after using it in the shower, in the sink, in the sink, with a hose, etc.

In addition the system presented, for ease of configuration and manufacturing of the necessary elements, Its implementation is economical, so it can be shaped and place one under each sink, bathtub, sink, in general any battery or water collector, making it more effective and offsetting the economic savings achieved on investments necessary for installation.

Description of the invention

This system for thermal energy savings during hot water consumption, it consists of the elements that are described below and whose arrangement is illustrated in the figure 1, by way of example of a practical embodiment.

The main element of this system consists in a heat exchanger (1) placed under the battery (10) -lavabo, bathtub, sink, etc.- through which the water passes used hot, and in the opposite direction the cold water passes through a coil (2) or analogous conduit - counter current arrangement. The heat of the hot water used passes to the cold water through the walls of the coil, so that the cold water is heated and when it reaches through the duct (7) to the mixer tap (9) -griffin, valve, ...- and is mixed with the hot water that reaches lower consumption is required through the duct (8) of the boiler of this to achieve the same comfortable temperature of use for the user (for example 33 ° C).

Other elements of the system are the conduit (6) that brings the cold water to the exchanger (1), the duct (5) that routes the dirty water already cooled in the exchanger towards the sewer, the conduit (4) that directs the hot water used from the battery (10) to the exchanger (1), where before it can be place a filter (3) that prevents the passage of particles and thus avoid the need for cleaning the exchanger every so often.

The ducts (7), (8) and (4), and the exchanger (1) must be coated with a thermal insulator to improve the efficiency of this system.

To better clarify the above concepts, to Below is a practical example of use, without the system of saving and with the energy saving system, to illustrate the level of savings that can be achieved by using this system.

Assuming that the cold water arrives at (11) at 14ºC and the hot water arrives from the boiler at (12) at 52ºC, to have the water in the battery (10) at 33ºC, which would be a comfortable use temperature, they would have to be mixed in the mixer tap (9) - tap, ... - at a rate of 50% cold water with 50% hot water, if the saving system is not available. With the savings system installed, in the heat exchanger the cold water can go from 14ºC to 23ºC, more or less depending on the type of exchanger that is installed, so that this water reaches the mixer tap (9) with a higher temperature (23ºC) than in the previous case (14ºC), the ducts being thermally insulated. Therefore, to achieve the same comfortable operating temperature of 33 ° C in the cell (10), a mixture in the mixer tap (9) of 65.5% cold water with 34.5% hot water coming from the battery is required boiler. In other words, for the same use, 50% of boiler water is consumed without the system, to 34.5% with the system installed, which represents a 31% saving in the consumption of hot water from the boiler, which also translates into 31% economic savings.

Description of the drawings

For a better understanding of what is described in this memory includes some figures in which, only by way of For example, a case study of this energy saving system

Figure 1 is a schematic (section view lateral) illustrating the relative arrangement of the various elements that make up the energy saving system, where: (1) is the heat exchanger, (10) is the water collection stack, (9) the mixer tap, (8) is the conduit that brings hot water sanitary (12), (6) is the conduit that brings cold water (11), (7) is the conduit that carries the water (11) already heated as it passes through the coil (2) inside the exchanger (1) to the mixer tap (9); (4) is the drain pipe that guides the hot water used to the exchanger (1), and (5) the drain pipe that directs the used water to the sewer.

Figures 2, 3 and 4 are different examples of diagrams (side section views) of possible exchangers of heat suitable for this system. The arrows indicate the senses in which the fluids circulate through each part. He exchanger of figure 2 is commonly known while the exchangers of figures 3 and 4 are own designs of the Inventor of this system.

Figure 2 is the case of the exchanger plus single called double tube or concentric tubes, where (13) is the inner tube.

Figure 3 in an enlargement of the exchanger which appears in figure 1, with the coil (2) in its inside.

Figure 4 represents an exchanger similar to that of the previous figure, but placed in the position of semi-horizontal arc and with baffle plates (15), all this to facilitate greater hot water contact used with the walls of the coil (2) and consequently get greater heat transfer to the cold water that circulates through the inside the coil. The element (14) -box, ...- is for the collection of particles that accumulate in the background.

Description of a preferred embodiment

The ducts (6), (7) and (8) can be of the type hose, for ease of installation, especially if they go under a sink, sink or any battery that is elevated. In the case of the bathtub or battery that is flush with the ground, they can be  stiffer type.

The flows of the two liquids (hot and cold) they must circulate in countercurrent inside the exchanger (1), as shown in the figures.

The most suitable types of exchangers for this system are those shown in figures 3 and 4, with all their possible variants, such as dividing the coil (2) into several smaller tubes (capillary type) to increase the contact surface between the two liquids and thus favor the heat transfer from hot to cold water, increasing the Efficiency of this system.

Claims (4)

1. System for saving energy during the consumption of hot water, by means of which the heat of the hot water that is discarded into the sewer system can be harnessed after use in the shower, in the sink, in the sink, or in the like, characterized by having a heat exchanger (1) under the battery (10), through which the used hot water passes, from the conduit (4), the cold water flowing through a coil (2) going through the exchanger in the opposite direction ), coming from the duct (6) and coming through the duct (7) to the mixer tap (9), where it mixes with the hot water, which reaches through the duct (8) of the boiler. 2. Energy saving system in the use of hot water according to claim 1, comprising the possibility that the ducts (7), (8) and (4), and the exchanger (1), are coated with a thermal insulator to Improve the efficiency of this system. 3. Energy saving system in the use of hot water according to claim 1, comprising the possibility that before the exchanger (1) a filter (3) that prevents the passage of particles and thus avoid the need Cleaning the exchanger every so often. 4. Energy saving system in the use of hot water according to claim 1, comprising the possibility that the heat exchanger element (1) is any type of exchanger liquid-liquid