Heat exchanger

Abstract

A heat exchanger (1) has an exchanger unit (20), comprising at least one first coiled conduit and one second coiled conduit (21 -23) that are substantially coaxial, and a casing (2) for housing the exchanger unit (20). The casing (2) has a first end wall (3), a second end wall (4), and a peripheral part (5) between the two end walls (3, 4). Each conduit (21 -23) has an inlet and an outlet, where the outlet of the first conduit (21, 23) is connected substantially in series to the inlet of the second conduit (22). The plurality of coiled conduits (21 -23) comprises one third conduit (23) for the first fluid, having turns of diameter greater than the diameter of the turns of the first conduit (21), in such a way that the third conduit (23) forms a helix, within which the helix formed by the first conduit (21 ) extends. The third conduit (23) has an inlet (23a) and an outlet (23b), the outlet (23b) of the third conduit (23) being connected to the inlet (22a) of the second conduit (22) in parallel to the first conduit (21), the second conduit (22) preferably having a flow section larger than the sections of passage of the first and third conduits (21, 23).

Description

technical field [0001] The present invention relates to heat exchangers, especially condensing heat exchangers. Background technique [0002] The function of a heat exchanger is to transfer thermal energy between two fluids: for example, in the case of a domestic gas boiler, the function of the heat exchanger is to heat the water circulating inside it, from the heat generated by the combustion via the burner Smoke starts. The boiler is conceived to utilize both the heat generated with combustion and the latent heat of condensation contained in the combustion fumes. In order to recover the heat contained in the smoke, the heat exchanger comprises a casing in which a circulation path of water is defined, against which the smoke is caused to flow. [0003] The amount of heat of condensation recovered depends primarily on the delivery temperature of the water from the heat exchanger and the return temperature of the water to the heat exchanger. Furthermore, in order to obtain...

AI Technical Summary

Problems solved by technology

[0008] These known solutions present a further disadvantage: in fact, the test procedure can only be carried out when the heat exchanger has actually been fully assembled, i.e. with the set of coiled conduits installed in the housing

In the case of production defects (e.g. liquid leakage due to suboptimal welding or sealing), this product must be at least partially disassembled, causing the time and costs involved in this

[0009] Also, in general, the construction of known heat exchangers with a series of multiple coiled conduit arrangements reduces the possibility of installation in consumer equipment (e.g. boilers or water heaters), for example due to the positioning of the water inlet and outlet connectors. far from being flexible

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