Efficient energy-saving quick-heating type electric water heater

Abstract

The invention relates to an efficient energy-saving quick-heating type electric water heater. The efficient energy-saving quick-heating type electric water heater mainly overcomes the defects of existing various electric water heaters: large size, long heating time, easiness in scaling and detonation and serious waste of heat storage type electric water heaters; high power, low water yield and incapability of reaching the bath temperature in winter of instant electric water heaters; and large size of hosts and water tanks, loud noise during operation and the like of air energy water heaters. The efficient energy-saving quick-heating type electric water heater is a novel electric water heater which has the advantages of the existing various electric water heaters. The efficient energy-saving quick-heating type electric water heater is formed in a way that a small insulation water tank with an auxiliary heating element, a primary heater and a waste heat recovery device are connected in series, wherein when the small insulation water tank (generally 4 to 6 liters) of the water heater is operated, tap water is preheated by the waste heat recovery device and then enters the heater so asto be heated, the auxiliary heating element and the primary heater are not operated at the same time, and the heating power is less than 5.5 Kw (as low as 1 Kw to 2 Kw during the shower in summer) within any period of time. The efficient energy-saving quick-heating type electric water heater has small size, low power, high heat efficiency and high water yield.

Description

Technical field [0001] The invention relates to the field of electric heaters, in particular to an electric water heater. Background technique [0002] At present, electric water heaters mainly include thermal storage electric water heaters, instant electric water heaters, and air energy electric water heaters. Thermal storage electric water heaters have low power, but large volume, long heating time and large heat loss. The instant electric water heater is small and exquisite, the water output is fast, the amount of heating is high, the thermal efficiency is high, but the power is too large, when the instant electric water heater is used in the family, it is easy to trip if the electric air switch is used with a larger power, and the water output is small , Especially in winter, it is generally unavailable, even if the water output is smaller. Although the air energy water heater is energy-saving, it is large in size. The volume of the main unit and the volume of the thermal i...

AI Technical Summary

Problems solved by technology

But the power is too large, generally reaching 6Kw to 8Kw or more (theoretically, the water output is equivalent to 3.3 to 4.5 liters of gas water heaters), and the special line that must be set up has high requirements for wires and meters, and the water output is small, and it can be used in hot weather. , almost can’t be used in winter, but it can be used, and the water output will be smaller

[0006] Third, household air energy water heaters have high energy efficiency ratio and low power consumption, but the heating time is long, the volume is large, the noise pollution is serious, and the price is expensive.

[0007] Fourth, people have designed a system that combines an instant electric water heater with a waste heat recovery device, and the energy efficiency ratio has been greatly improved, but the total power of the instant electric water heater has not been reduced, because if the power is small, the water temperature when the water heater starts The rise is small, and the temperature of the water preheated by the waste heat recovery device rises slowly. Generally, it takes a long time to cycle to reach the shower temperature. For example, the cold water of 15 degrees is heated to the shower temperature of 40 degrees with a power of 4.5Kw, assuming The water output is 4 liters, and it takes more than 2 minutes of circulation to reach a steady state. During the cycle time, the water temperature of the water heater does not reach the shower temperature, and the water and electricity during this period are wasted in vain.

Every time the water heater is turned off in the middle of a shower, the above-mentioned cycle must be repeated. During this time, electricity and water will be wasted

Therefore, this system still uses a high-power heater, which cannot reduce the load on the circuit.

In order to shorten the start-up time, a high-power heater is generally used to start, and the power will drop after reaching the shower temperature, but the start-up cycle time is not significantly shortened. If the above-mentioned 4.5Kw is replaced by 8Kw heating, the start-up time is also more than 1 minute. During the cycle time, the water temperature does not reach the shower temperature and cannot be used for showering, which will cause waste of water and electricity

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