LT4518B - Water heater - Google Patents

Abstract

This water heater is related to heat exchange equipment and may be used for hot water preparation, when it works in accumulative high-speed heating operating conditions. The heater consists of a warmed-up water chamber and spiral heating exchanger, installed in a pipe with core, and water heating branch pipes. This particular water heating pipe is set vertically into the water heater warmed-up water chamber. The branch pipe of the water being heated feed into the warmed-up water chamber is installed in the lower part. The hot water exhaust branch pipe from the spiral heating exchanger is led outside the heater.

Description

The invention relates to a group of heat exchangers and can be used for heating water.

There are two main types of heat exchanger-heaters. One of them is described in the book '' Artyushenko N.M. Water heating of individual houses. Kiev, 1980 50 pages. " In this unit, the heating water, circulating through a channel with relatively low surface areas, heats the water accumulated in a larger volume, transferring heat through the common walls. This allows the use of relatively low temperature and low flow heating water to transfer the heat to the heater, accumulating a higher amount of heat. The disadvantage of such a device is that due to poorly developed heat exchange surfaces, the preparation of a larger portion of hot water is time consuming and the device itself is bulky.

In the second type of device, the so-called high-speed heaters, the heat exchange surfaces are well developed, but they usually do not have the volume to store the heated water. A device of this type is described in SU 1760256 AI, IPC Index F24H1 / 00. They heat the water just before use, which requires a large instantaneous power source supplying the heating water. With lower demand for hot water, it is often difficult and uneconomic to direct a larger amount of the higher temperature and higher flow rate of heating water to the heat exchanger.

Also known is a combined water heater described in the invention description SU 1562620 AI, IPC index F24H1 / 2, which consists of two heating water chambers and a tubular heat exchanger therein. The disadvantage of this unit is that due to the poorly developed heat exchange surface and because of their entire volume of heated water chamber, it will not work efficiently in high-speed heater mode. Its major disadvantage is that the heating water must circulate through a relatively small diameter pipe, which causes increased hydraulic resistance. Therefore, such a device can only be operated in forced-circulation heating systems, which significantly reduces the application area. It cannot be used in systems with gravitational circulation.

The object of the invention is to extend the technical possibilities of using a water heater by adapting it to work at lower water temperatures as well as its various flow rates. This is especially important when heating water in dwelling houses with a gravity heating system, where high-temperature water is not needed for indoor heating (good thermal insulation of the building, spring - autumn seasons).

This task is solved by the device; consisting of a preheated water chamber with a cold water outlet at the bottom and a helical heat exchanger in that the helical heat exchanger is inserted into a tube with a core ending at the ends of the valves. The advantage of this solution lies in the fact that it is possible to arrange the flow of the heating water at the required speed in turbolentic mode with low hydraulic resistances. This provides particularly good conditions for heat exchange with the heated water contained in the spiral heat exchanger.

The fact that said pipe is vertically inserted into the heating water chamber and has a core allows the heater to operate in the volume heater mode, reaching the flow of the heating water in turbolentic mode, even at low flow rates close to the pipe wall.

Therefore, heat is efficiently transferred through the pipe wall to the heated water in the chamber. There, it stratifies by temperature due to the different comparative weights.

The fact that the lower end of the spiral heat exchanger is connected to the flange at the top of the chamber and the upper end is directed to the outside of the heater allows the second degree of the heater, i.e. spiral heat exchanger to get hotter water. This is explained by the fact that the spiral heater enters the hottest water at the top of the chamber.

The diagram of the heater is given in the drawing. The heater consists of a preheated water chamber 1 with a cold water pipe 2 and a helical heat exchanger 3. The helical heat exchanger 3 is inserted into a pipe 4 having pipes 5 and 6 and a core 7. The pipe 4 is in turn vertically inserted into the chamber 1. connected to a flange 8 at the top of the chamber 1 and the other end to a flange 9 located outside the chamber 1. The spacing between the core 7, the heat exchanger 3 and the pipe 4 is selected so as to ensure maximum heating water velocity at the allowable hydraulic resistance. The latter, like the volume of the chamber 1, can be selected according to the specific application of the heater. The heater nozzle 5 is for connection to the hot water branch of the heating water system and the nozzle 6 for the return water branch. Pipe 2 is used to supply cold heating water to the heater, and pipe 9 to discharge hot water.

This type of heater can operate in two modes. If the flow of heating water through conduit 4 is relatively low, then this heat is gradually transferred through the walls of conduit 4 to the heated water in chamber 1 which filled it through conduit 2. If heated water is not discharged through conduit 9, it gradually warms to heating water temperatures. The water in the upper part of the chamber is hotter than the lower one until the heating process is complete or when cold water is added to this chamber. Once water is introduced through the nozzle 9, it flows from the chamber 1 through the nozzle 8 into a helical heat exchanger 3, where it is additionally heated with heating water through the walls of the heat exchanger. Because water flows turbulently on both sides of the heat exchanger 3 due to the shape of the walls and the velocity of the two liquids, the delivery is much more intensive than the pipe 4 and the water in the preheated water chamber 1. This adds extra heat to the heat As the water enters the spiral heat exchanger 3 through a nozzle 8 from the upper part 1 of the chamber, the water is first of all hotter to the user, since this is what the upper part is because of its comparative weight. Therefore, even if the heating water temperature is not very high, utilizing the accumulated heat of the heating water, it is possible to meet the small domestic hot water needs that are common.

If it is necessary for the heater to supply a higher amount of high temperature water, then the temperature of the heating water must be raised and its flow increased. At high water velocities, the heat exchange between the fluids in the helical heat exchanger 3 and the pipe 4 intensifies. Using the same principle as in the first case, the heater can produce unlimited amount of hot water. Only in this case will most of the heat be transmitted through a vigorously operated spiral heat exchanger 3. This will provide the benefits of a bulk and high-speed heater with a small-sized unit and extend its applications.

Claims (1)

DEFINITION OF INVENTION Water heater consisting of a heated water chamber with a cold water pipe at the bottom and a helical heat exchanger, characterized in that the helical heat exchanger, the lower end of which is connected to a pipe at the top of the heated water chamber and the upper end of which , the ends of which end with flaps and the pipe itself inserted vertically into the heated water chamber.