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Thermostatic condensing gas water heater and control method therefor

a gas water heater and condensing technology, which is applied in the direction of water heaters, air heaters, lighting and heating apparatus, etc., can solve the problems of fluctuation of the water heater's outlet water temperature and obvious increase in user's investment cost, so as to improve the heat exchanger efficiency of the gas water heater, prevent any empyrosis, and ensure the user's comfort in use.

Inactive Publication Date: 2016-10-27
A O SMITH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution effectively absorbs latent heat to maintain water temperature within a set range, enhancing user comfort and safety without increasing costs, by efficiently utilizing the condensing heat exchanger's storage space and latent heat, thus preventing sudden temperature drops.

Problems solved by technology

As known to the applicant, the existing gas instantaneous water heaters all have the problem of “coldwater sandwich”, i.e., during the usage of the hot water, when the user turns on the water again in a short time after it is turned off, the outlet water temperature of the water heater fluctuates due to the reasons such as the ignition preparation delay during startup, the water temperature rise during shutdown, etc., and especially the water temperature drops suddenly.
In order to solve the problem, most of the water heater manufacturers adopt auxiliary heating measures such as utilizing the recycled water by adding a water pump, or connecting the water heater in series with a small electronic water heater which is often referred to Little Kitchen Aid, but the user's investment cost is obviously increased.

Method used

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  • Thermostatic condensing gas water heater and control method therefor
  • Thermostatic condensing gas water heater and control method therefor
  • Thermostatic condensing gas water heater and control method therefor

Examples

Experimental program
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embodiment 1

[0027]The thermostatic condensing gas water heater of the embodiment is as shown in FIG. 1, a first heat exchanger (main heat exchanger) 7 and a second heat exchanger (condensing heat exchanger) 4 are provided in succession along the flow direction of the burnt flue gas of a combustion chamber 8 of a burner. The water flow channels of the first heat exchanger 7 and the second heat exchanger 4 are connected in parallel between a water inlet pipe 10 and a water outlet pipe 9, and provided with a first flow control valve 3 and a second flow control valve 5 controlled by a controller to adjust the water flow distribution proportions of the first heat exchanger 7 and the second heat exchanger 4, respectively. The water flow channel outlets of the first heat exchanger 7 and the second heat exchanger 4 are provided with a first temperature sensor Te and a second temperature sensor Tc, respectively, and the water outlet pipe 9 is provided with a third temperature sensor To. The signal outpu...

embodiment 2

[0035]The thermostatic condensing gas water heater of the embodiment is as shown in FIG. 3, and its basic structure is same as that of Embodiment 1, except that the second heat exchanger 4 is provided with an electrical heating rod 11 heating water therein and controlled by a controller.

[0036]During working, the controller acquires a temperature Te from a first temperature sensor and a temperature Tc from a second temperature sensor, and reads a set temperature Ts and a controller preset temperature Ta (Ta=Ts+ΔT, ΔT is a predetermined temperature tolerance). When Te<Ta and Tc<Ta, the controller controls the electrical heating device, so that the temperature Tc of the second temperature sensor approaches the controller preset temperature Ta. Please refer to FIG. 4 for the specific control flow, wherein it is judged that “combustion is stopped for more than a predetermined time” because the combustion afterheat can continue heating the heat exchanger within a certain time (e.g., 5 min...

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Abstract

A thermostatic condensing gas water heater, comprising a burner; a first heat exchanger (7), a second heat exchanger (4), a water inlet pipe (10), and a water outlet pipe (9) provided in succession along the flow direction of the burnt flue gas; a controller; and a water flow channel connecting the first heat exchanger (7) and the second heat exchanger (4) in parallel between the water inlet pipe (10) and the water outlet pipe (9), wherein flow control valves (3, 5) capable of adjusting the water flow distribution of the first heat exchanger (7) and the second heat exchanger (4) are provided on the water flow channel and controlled by the controller.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a water heater and a control method therefor, and particularly, to a thermostatic condensing gas water heater and a control method therefor, which belong to the technical field of gas appliances.BACKGROUND OF THE INVENTION[0002]As known to the applicant, the existing gas instantaneous water heaters all have the problem of “coldwater sandwich”, i.e., during the usage of the hot water, when the user turns on the water again in a short time after it is turned off, the outlet water temperature of the water heater fluctuates due to the reasons such as the ignition preparation delay during startup, the water temperature rise during shutdown, etc., and especially the water temperature drops suddenly. This phenomenon is particularly apparent in winter, and the user's comfort in using the water heater is greatly influenced. In order to solve the problem, most of the water heater manufacturers adopt auxiliary heating measures such a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F24H8/00F24H9/20F24H1/14
CPCF24H8/00F24H9/2035F24H1/145Y02B30/00F24H15/37F24H15/176F24H15/219F24H15/31F24H15/238F24H15/281F24H15/174F24H1/107F24H9/0005
Inventor QIU, BUBI, DAYANZHOU, SUJUANZHANG, SHIPINGWU, YUEHUA
Owner A O SMITH