Heating and hot water supply system

Abstract

A heating and hot water supply system is provided and includes at least a distribution unit, a hot water supply heat exchanger and a flow rate adjusting unit. The distribution unit adjusts a distribution ratio capable of handling operations including heating, hot water supply and simultaneous heating and hot water supply operations. When the hot water supply operation starts, first hot water supply control, which adjusting a temperature to a hot water supply set temperature by the flow rate adjusting unit, is performed. After supplying the hot water having the hot water supply set temperature according to the first hot water supply control is maintained for a reference time or longer, transition to second hot water supply control, which a tapping water temperature of the hot water supply heat exchanger is brought close to the hot water supply set temperature, and a mixing amount of clean water reduced, is performed.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of Japanese Patent Application No. 2019-194383, filed on October 25. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.BACKGROUNDTechnical Field[0002]The disclosure relates to a heating and hot water supply system which has a heating operation function and performs a hot water supply operation using a heat medium for heating.Description of Related Art[0003]In recent years, in order to supply hot water at a hot water supply set temperature, water heaters that mix clean water with heated clean water, and supply hot water whose temperature is adjusted have been widely used. For example, in a water heater in Patent Document 1, in order to supply hot water at a hot water supply set temperature, a heating capacity of a burner is adjusted and thus the temperature of hot water heated by a heat exchanger is adjusted, a...

AI Technical Summary

Benefits of technology

[0007]The disclosure is to provide a heating and hot water supply system that can suppress precipitation of scale.

Problems solved by technology

In addition, in parts to which scale adheres, heat exchange is disturbed, and thus heat exchange efficiency decreases, the temperature increases, and in some cases, damage is caused.

Also in such a heating and hot water supply system, when clean water containing a large amount of mineral components is heated, this is not preferable because scale precipitates in the heat exchanger for hot water supply and the heat exchange efficiency decreases, and there is also a risk of the hot water passage becoming blocked.

In particular, when the heating and hot water supply system has a configuration in which clean water is mixed into hot water heated by a hot water supply heat exchanger for hot water supply and hot water is supplied, since clean water is heated to a high temperature in the hot water supply heat exchanger, there is a problem of precipitation of scale being accelerated.

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