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Flow-changing low-temperature air-compensation air source heat pump water heater and control method thereof

An air source heat pump, variable flow technology, applied in fluid heaters, lighting and heating equipment, etc., to achieve stable and efficient operation, reduce exhaust temperature, improve heating capacity and operating performance.

Inactive Publication Date: 2011-10-19
JIANGSU TENESUN ELECTRICAL APPLIANCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a variable-flow low-temperature air-source heat pump water heater to solve the technical problems of flow distribution and superheat control in the main and auxiliary circuits of the ultra-low temperature heat pump water heater

Method used

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  • Flow-changing low-temperature air-compensation air source heat pump water heater and control method thereof
  • Flow-changing low-temperature air-compensation air source heat pump water heater and control method thereof
  • Flow-changing low-temperature air-compensation air source heat pump water heater and control method thereof

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Embodiment Construction

[0031] In order to better understand the above-mentioned technical solution of the present invention, a further detailed description will be given below in conjunction with the accompanying drawings and embodiments.

[0032] The variable-flow low-temperature air-source heat pump water heater of the present invention includes a compressor 1, a heat exchanger 2, a liquid reservoir 3, a dry filter 4, an economizer 5, an evaporator 8, a gas-liquid separator 9, and a one-way valve 12 , a water tank 14 and a circulation pump 15, and also includes a main solenoid valve 6, a main electronic expansion valve 7, an auxiliary electromagnetic valve 10, an auxiliary electronic expansion valve 11, and a set of sensors and a flow control unit, see figure 1 and figure 2 .

[0033] The main electromagnetic valve 6, the main electronic expansion valve 7, the auxiliary electromagnetic valve 10 and the auxiliary electronic expansion valve 11 are connected in the working medium circulation pipeli...

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Abstract

The invention relates to a flow-changing low-temperature air-compensation air source heat pump water heater and a control method thereof. The water heater comprises an air source heat pump compressor set, an electromagnetic valve and an electric expansion valve connected in a working medium loop, and a microprocessor control unit and a sensor for realizing computer process control. The control method comprises the following steps of reading monitoring data of the sensor, detecting temperature and pressure and storing the temperature and pressure in a storage device, calculating a uniform superheat degree according the stored temperature and pressure, and calculating the opening increment of the expansion valve according to the uniform superheat degree as well as adjusting the opening degree of the electric expansion valve. By setting the steps of highest operating pressure controlling, defrosting and exhaust temperature controlling, the super-low temperature heat pump water heater can be ensured to run stably and efficiently under the states of different working conditions and to run stably in poor working conditions with low environment temperature and high water temperature, the hysteresis of flow adjustment is avoided, a pressure ratio is controlled in a controllable range, and the exhausting temperature can be reduced, so that the service life of the set can be guaranteed.

Description

technical field [0001] The invention relates to a fluid heater using a heat pump, in particular to a variable-flow low-temperature air-supplement air-source heat pump water heater and a control method thereof. Background technique [0002] In addition to the characteristics of environmental protection and energy saving, the air source heat pump unit also has the characteristics of simple system, low initial investment, convenient maintenance, and flexible adjustment, so it has been popularized and applied in a large area. Due to the ultra-low ambient temperature, the overall energy efficiency ratio of air source heat pump water heaters is comparable to that of water source heat pumps even in cold northern regions, and the heat source for external heating is stable. At the same time, it hardly occupies land area, and the initial investment is much lower than other heat pump products. Therefore, in the situation where every inch of land is very expensive, this kind of ultra-lo...

Claims

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Application Information

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IPC IPC(8): F24H4/02F24H9/20
Inventor 王天舒刘军王玉军王颖
Owner JIANGSU TENESUN ELECTRICAL APPLIANCE
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