Combined heating and hot water boiler, and control method therefor

Abstract

The objective of the present invention is to provide a combined heating and hot water boiler, and a control method therefor, the boiler being capable of reducing a temperature deviation of hot water when the hot water is used, and reducing the number of times that a heater is turned on/off, so as to prevent the lifespan of a relay from being shortened. To this end, the combined heating and hot water boiler comprises: a first heat exchanger for generating heated supply water; a second heat exchanger for generating hot water by means of heat exchange between tap water and the supply water supplied from the first heat exchanger; a flowrate regulating valve for regulating the circulation flowrate of the supply water, which circulates by passing through the second heat exchanger, during a hot water mode; and a control unit for calculating a required heat quantity corresponding to a hot water temperature set by a user during the hot water mode, setting a supply heat quantity, supplied from the first heat exchanger, such that the supply heat quantity corresponds to the required heat quantity, and regulating the opening degree of the flowrate regulating valve such that the circulation flowrate corresponds to the required heat quantity during the hot water mode.

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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