Boiler for heating and hot water and its control method

Abstract

The present invention aims to provide a heating and hot water dual-purpose boiler and its control method capable of reducing hot water temperature deviation when hot water is used, and reducing the number of on / off of the heater to prevent shortening of the life of the relay. A heating and hot water boiler for achieving the above object includes: a first heat exchanger generating heated supply water; a second heat exchanger passing between the supply water supplied from the first heat exchanger and the direct supply water heat exchange to generate hot water; the flow regulating valve is used to adjust the circulating flow rate of the supply water circulating through the second heat exchanger in the hot water mode; the control part, in the hot water mode, calculates the Set the required amount of heat corresponding to the hot water temperature, and set it so that the supply heat supplied from the first heat exchanger corresponds to the required amount of heat, and in the hot water mode, adjust the opening of the flow regulating valve degrees such that the circulation flow corresponds to the required heat.

Description

technical field [0001] The present invention relates to a dual-purpose boiler for heating and hot water and its control method, in particular to a dual-purpose boiler for heating and hot water capable of reducing temperature deviation of hot water when hot water is used in the dual-purpose boiler for heating and hot water, and its control method. Background technique [0002] Usually, boilers that can use both heating and hot water operate in a heating mode and a hot water mode. The heating mode is the mode in which the heating water heated by the heat exchanger is supplied to the heating needs; The mode in which heated heating water is supplied to the hot water supply heat exchanger. [0003] figure 1 It is a figure which shows the structure of the conventional common heating and hot water boiler. [0004] The dual-purpose boiler for heating and hot water includes: a first heat exchanger 10 for heating the supply water; an expansion tank 20 for storing the supply water; a...

AI Technical Summary

Problems solved by technology

[0009] First, for a system with a slow rate of heat control through the first heat exchanger 10, the temperature change rate of the supply water supplied from the first heat exchanger 10 will also be slowed down. 40 is heated and the temperature change speed of the hot water will also slow down, so there is a problem that when the hot water setting temperature is changed, the deviation of the hot water temperature becomes larger

[0010] Second, when the heating and hot water boiler is an electric boiler, the heat supply cannot be controlled in proportion to the first heat exchanger 10, so the temperature deviation will be aggravated

Therefore, before cooling down to the supply water temperature suitable for the hot water temperature set by the user, since the high-temperature supply water flows into the second heat exchanger 40, the temperature of the outgoing hot water will also rise sharply, so there may be The problem of scalding hot water users

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