Air source heat pump water heater system and operation control method thereof

An air source heat pump and water heater technology, which is applied to heat pumps, fluid heaters, refrigerators, etc., can solve problems such as affecting the life of the compressor on the thermal efficiency of the whole machine, failing to achieve a good energy-saving effect, and shortening the defrosting time. The effect of avoiding economic loss, high temperature difference and reducing defrost time

Active Publication Date: 2013-06-12
陕西隆科来福节能设备有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned control method is simple and convenient, but in actual application, it cannot achieve energy-saving effect very well, resulting in many defects in the existing air source heat pump water heater, for example:
[0004] (1) In the existing air source heat pump water heater, even if the compressor with good performance is selected for the system, the evaporation temperature is within the range of -25°C to 25°C, but in order to provide sufficient heat, the superheat degree is selected to be greater than 10°C. Therefore, the system can only work when the ambient temperature is greater than -10°C, which is only applicable to southern cities, while the ambient temperature in northern cities is often lower than -10°C in winter, and the system cannot operate
Therefore, its scope of application is small
[0005] (2) In the existing air source heat pump water heater, in order to provide enough heat, the superheat degree is selected to be greater than the temperature difference of 10°C. It is easy to frost at low temperature, the frequency of defrosting is frequent, and the non-defrosting time is shortened, so it is not energy-saving. Affect the heating efficiency of the whole machine and the life of the compressor

Method used

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  • Air source heat pump water heater system and operation control method thereof
  • Air source heat pump water heater system and operation control method thereof

Examples

Experimental program
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Embodiment 1

[0028] refer to figure 1 , is an air source heat pump water heater system of the present invention, comprising an outdoor unit and an indoor unit. The outdoor unit mainly includes a casing 1 , a fan 3 and an evaporator 2 arranged in the casing 1 . An outdoor ambient temperature sensor D1 is arranged inside the casing 1 of the outdoor unit, and an evaporator surface temperature sensor D3 is arranged on the evaporator 3 . The indoor unit mainly includes a compressor 9, a four-way reversing valve 5, an electronic expansion valve 8, a heat exchanger 7, a water tank liner 4, and a water pump 10. The water tank liner 4 is provided with a water temperature sensor D5 at the upper part of the water tank and a water temperature sensor D6 at the lower part of the water tank. The lower part of the water tank liner 4 is provided with a circulating cold water pipe communicated with the water inlet of the heat exchanger 7, and the upper part is provided with a hot water injection pipe comm...

Embodiment 2

[0049] The difference between the further embodiment and the air source heat pump water heater system of the above-mentioned embodiment 1 lies in: first, the temperature setting module, when setting the target water temperature T0 of the water tank, also sets the energy-saving factor M, and M is 40° C. to 60° C. Integer between ℃. Second, the control module is used for the following control: when the water temperature in the upper part of the water tank is T5≤T0-5°C or when T0>M and the water temperature in the upper part of the water tank is T5≤M-5°C, the electronic expansion valve will set the initial value of the electronic expansion valve after self-inspection. When the opening is 15% to 60%, start the compressor and fan, and the compressor will heat up. The rest of the air source heat pump water heater system in this embodiment is completely the same as that in Embodiment 1, and will not be repeated here.

[0050] The difference between this embodiment 2 and the control ...

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Abstract

The invention discloses an air source heat pump water heater system and an operation control method thereof. The air source heat pump water heater system comprises an outdoor unit and an indoor unit, a temperature measuring unit and a control device. In the operation control method of the air source heat pump water heater system, the aperture of an electronic expansion valve is adjusted, so that the surface temperature T3 of an evaporator tends to the target temperature T8, wherein T8 is equal to -0.005T1*T1+0.85T1-a, and a is 4-8 DEG C; under the condition that the water outlet temperature of a heat exchanger is larger than the water temperature T5 at the upper part of a water tank, the pump discharge is adjusted to become larger; and the rotating speed of a fan is regulated so that the temperature T4 of an overheated working medium and the surface temperature T3 of the evaporator are kept in a range from 5 DEG C to 20 DEG C. Therefore, applicable territory range of the water heater system can be expanded, defrosting time and frequency are reduced, and energy efficiency is increased.

Description

technical field [0001] The invention relates to an air source heat pump water heater, in particular to an air source heat pump water heater system and an operation control method thereof. Background technique [0002] The existing air source heat pump water heater uses the outdoor compressor to heat the cold water in the indoor water tank. The general control steps are as follows: the user sets the target temperature of the water tank, and the system determines the working state of the compressor according to the target temperature: (1) When the water tank temperature sensor detects that the water temperature is lower than the target temperature by a fixed difference, the compressor is directly started for heating; (2) when the water tank temperature sensor detects that the water temperature reaches the target temperature, the compressor stops working. [0003] The above-mentioned control method is simple and convenient, but in actual application, it cannot achieve energy-sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B30/00F24H4/04F24H9/20
Inventor 刘小军
Owner 陕西隆科来福节能设备有限责任公司
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