Heating control method of gas water heater

Abstract

A heating control method for a gas water heater, characterized in that it includes the following steps: 1. standby; 2. judging whether there is a demand for hot water, if so step 5; if no, the next step; If one is less than T0, start the antifreeze heating module; if not, return to step 1; 4. Check whether the temperature of the water entering and leaving the water is greater than T1 at the same time, if yes, stop heating, if not, continue heating; 5. Calculate the heating yield Q; 6. Whether Q is less than Qmin, if it is the next step; if not, use gas heating; 7. Use an antifreeze heating module; 8. Compare the outlet water temperature with Tf, and adjust the heating power of the electric heater according to each situation. The advantage of the present invention is that: the electric heater block with adjustable heating power is adopted to solve the problem that the target temperature cannot be reached by burning under small load in summer, thereby increasing the capacity of the gas water heater without artificially widening the load area of ​​the gas water heater. Temperature adjustment range.

Description

technical field [0001] The invention relates to a gas water heater, in particular to a heating control method of the gas water heater. Background technique [0002] In the prior art, when the gas water heater is in use, the outlet water temperature is generally adjusted by adjusting the heating power and water flow rate. For example, the Chinese invention patent application "Constant Temperature Control Method for Instant Water Heater" with the patent number of 200710099387.0 discloses a Automatic constant temperature control method for instant water heater water temperature. In this patent application, the water flow of the instant water heater is used as a variable to participate in automatic constant temperature control: when the heating power is adjusted to the limit, the water flow of the instant water heater is used as a variable to participate in the adjustment. Specifically In other words, the water temperature is lower than the set value - correspondingly increase t...

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Problems solved by technology

[0003] The problem in the above-mentioned patents is that the minimum load of the current water heater is a preset fixed value, which cannot be adjusted according to the actual situation. However, the water heater will be affected by the ambient temperature in actual use. The pipes are frozen (may be cracked and leak), and many of the current water heaters are equipped with antifreeze functions, such as figure 1 As shown, three antifreeze blocks with fixed resistance controlled by the temperature controller are used. When the temperature controller detects that the temperature is lower than the set low temperature (such as 5°C), the circuit is turned on and the antifreeze block is heated to ensure low temperature in winter. The sewer pipe will not freeze

Although the antifreeze function can solve the heating problem in low-temperature environment in winter, when the gas water heater is used in high-temperature environment, it often cannot reach the minimum set temperature. Exposure to the outside, the temperature of the water inlet end of the water heater is relatively high (may even reach 30°C). Make users feel that the water temperature is too hot when bathing in summer, which affects user experience

If the load area of ​​the gas water heater is artificially widened, it may cause continuous combustion change, increase the risk of blowing out the flame, or increase the manufacturing cost. Therefore, the current gas water heater needs to be further improved to better adapt to different Heated use at ambient temperature

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