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Control method for efficient operation of multi-compressor energy cascade utilization water-water heat pump hot water unit

A multi-compressor and hot water unit technology, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of low compressor efficiency, high energy consumption of compressors, and rough control process, so as to improve efficiency and save energy Effect

Active Publication Date: 2019-05-31
广州市设计院集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of rough control process, low compressor efficiency, high energy consumption of the compressor and low energy efficiency ratio of the unit in the existing control method, and to provide a multi-compressor energy cascade utilization water-water heat pump hot water unit with high efficiency The operation control method has the characteristics of making the unit run efficiently and saving energy

Method used

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Examples

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specific Embodiment 1

[0027] A high-temperature water-to-water heat pump hot water unit with 4 compressors is designed for inlet and outlet water temperatures of 15°C and 60°C. The hot side inlet and outlet water temperatures corresponding to the first compressor are 15°C and 28°C, the hot side inlet and outlet water temperatures corresponding to the second compressor are 28°C and 40°C, and the hot side inlet and outlet water temperatures corresponding to the third compressor 40°C and 50°C, the hot side inlet and outlet water temperatures corresponding to the fourth compressor are 50°C and 60°C;

[0028] The specific control method is:

[0029] 1) When the actual inlet water temperature t 1 When ≤28℃, turn on all the compressors. When the water temperature changes within this range, the load change is matched by the load / decrease of the unit; for example, under design conditions, the inlet water temperature is 15°C, and the temperature difference between inlet and outlet water is 45°C; When the water t...

specific Embodiment

[0035] The feature of other specific embodiments of the present invention is: it is set that the one-water-water heat pump hot water unit has n compressors, and the total inlet and outlet water temperature of the hot water side of the unit is t 1 And t 2 , The design inlet and outlet water temperature of the hot water side corresponding to each compressor is t n1 And tn 2 , N is the nth compressor in series, and the temperature of the inlet and outlet water on the hot water side of the first compressor is t 11 And t 12 ; The actual inlet and outlet water temperature of the unit is t 1 And t 2 ; N is a constant of 2-10;

[0036] 1) When the actual inlet water temperature t 1 ≤t 12 When the time, all compressors are turned on, and when the water temperature changes within this range, the load change is matched by the unit load and drop;

[0037] 2) When the actual inlet water temperature t 12 1 ≤t 22 When the first compressor is stopped, only the 2-n compressor is turned on. When the w...

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Abstract

The invention relates to a control method for high-efficiency operation of a multi-compressor energy-step-utilization water-heating unit of a water-to-water heat pump. The control method is characterized in that water temperatures of total inlet water and outlet water at a hot water side of the unit are set to be t1 and t2; inlet water and outlet water temperatures at the hot water side corresponding to each compressor are designed to be tn1 and tn2; n presents the tandem n-th compressor; the inlet and outlet water temperatures at the hot water side of the first compressor are t11 and t12; practical inlet and outlet water temperatures of the unit are t1 and t2; when the practical inlet water temperature t1 is lower than or equal to t12, all compressors are started; when the practical inlet water temperature t1 is greater than t12 but lower than or equal to t22, the first compressor is stopped, and only the (2-n)-th compressor is started; when the practical inlet water temperature t1 is greater than t22 but lower than or equal to t32, the first and the second compressors are stopped, and only the (3-n)-th compressor is started; when the practical inlet water temperature t1 is greater than t(n-1)2 but lower than or equal to t2, the n-th compressor is started, and when the water temperature changes with the range, load changes are matched by adding and subtracting through the unit; and when the inlet water temperature reaches (t2+1) DEG C, all compressors are spotted. The control method has the beneficial effects of enabling the unit to efficiently operate, saving energy resources, and the like.

Description

Technical field [0001] The invention relates to a control method for high-efficiency operation of a water-water heat pump hot water unit using multiple compressor energy cascades. It belongs to the technical field of HVAC / water supply and drainage. Background technique [0002] At present, in hotels, hotels, hospitals, schools and other buildings, there is a demand for domestic hot water. Generally, domestic hot water is provided in air source heat pump systems, boiler room systems, and water-water heat pump systems, among which water-water heat pump energy efficiency Ratio is the highest. [0003] In the prior art, for the water-water heat pump system, the core equipment is a water-water heat pump hot water unit, which is a cascade utilization of energy. High-efficiency water-water heat pump units are generally equipped with multiple compressors to gradually increase the water temperature and maintain the energy efficiency of the unit. However, in the existing control methods, w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25B49/02
CPCF25B49/022
Inventor 屈国伦谭海阳
Owner 广州市设计院集团有限公司
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