Instant heating type water heater constant temperature control system and method

Abstract

The invention relates to an instant heating type water heater constant temperature control system and method. The control system comprises a heat pump heating system, an instant heating system and a water amount adjusting system which are sequentially arranged in the direction from a water inlet to a water outlet of a water heater. According to the control method, the outlet water temperature, the total water outlet temperature and the water amount of a heat pump and the output power of the instant heating system are detected, and the water volume, the working state of the heat pump heating system and the output power of the instant heating system are adjusted, so that the total outlet water temperature is maintained at preset temperature. Compared with the prior art, the control system and method have the advantages of saving energy due to the fact that the heat pump and the instant heating system are used for heating in a hybrid mode, and being capable of realizing outlet water constant temperature control in the range of wider flow and a preset temperature range through a unique water volume adjusting system.

Description

technical field [0001] The invention relates to the technical field of water heaters, in particular to a constant temperature control system and control method for instant water heaters. Background technique [0002] The patent with the publication number CN102410636A proposes an instant heating constant temperature electric water heater. When the power of the electric water heater is sufficient to provide the power required for heating, it can achieve a constant temperature of the water and reach the set temperature, but when the water inlet temperature is low, or The increase in water volume or the high set temperature makes the required heating power exceed the maximum power provided by the instant constant temperature electric water heater. Although the constant temperature of the water outlet can be guaranteed (100% power output), it cannot be guaranteed that the water outlet temperature can reach the set temperature. . [0003] The patent with the publication number C...

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Problems solved by technology

But when the total amount of water flowing through the system is relatively small (due to low water pressure, excessive pipeline resistance, etc.), or the ambient temperature is high and the heating capacity is large, but the set temperature is not high (generally when the ambient temperature is high When the tap water temperature is high, the set temperature of the user’s water will be relatively low), the above situations may cause the current outlet water temperature to be higher than the set temperature, even if the water valve opening is continuously increased, the water volume cannot be increased, and eventually the outlet water temperature Exceeding the set temperature, it is impossible to achieve a constant temperature in the true sense

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