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Control method for high-efficiency operation of multi-compressor energy-step-utilization water-heating unit of water-to-water heat pump

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 save energy and improve efficiency Effect

Active Publication Date: 2015-11-11
广州市设计院集团有限公司
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  • Summary
  • Abstract
  • Description
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  • 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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Effect test

specific Embodiment 1

[0027] A high-temperature water-to-water heat pump hot water unit has 4 compressors, and the design inlet and outlet water temperatures are 15°C and 60°C. The water inlet and outlet temperatures of the hot side corresponding to the first compressor are 15°C and 28°C, the water inlet and outlet temperatures of the hot side corresponding to the second compressor are 28°C and 40°C, and the water inlet and outlet temperatures of the hot side corresponding to the third compressor are 40°C and 50°C, and the inlet and outlet water temperatures of the hot side 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 the temperature is less than or equal to 28°C, all compressors are turned on. When the water temperature changes within this range, the load change is matched by the loading and unloading of the unit; for example: under the design working condition, the inlet water tempe...

specific Embodiment

[0035] The characteristics of other specific embodiments of the present invention are: a water-to-water heat pump hot water unit is set to have n compressors, and the total water temperature of the water entering and leaving the hot water side of the unit is t 1 and t 2 , the design inlet and outlet water temperature of hot water side corresponding to each compressor is t n1 and tn 2 , n is the nth compressor connected in series, and the water temperature at the hot water side of the first compressor is t 11 and t 12 ;The actual temperature of water entering and exiting 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 , turn on all the compressors, and when the water temperature changes within this range, match the load change through the loading and unloading of the unit;

[0037] 2) When the actual inlet water temperature t 12 1 ≤t 22 , stop the first compressor, and only turn on the 2-n compressors. 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 efficient operation of a multi-compressor energy cascade utilization water-water heat pump hot water unit. It belongs to the technical field of HVAC / water supply and drainage. Background technique [0002] At present, in buildings such as hotels, hotels, hospitals, and schools, there is a demand for domestic hot water. Generally, there are air source heat pump systems, boiler room systems, and water-to-water heat pump systems to provide domestic hot water. Among them, the water-to-water heat pump energy efficiency than the highest. [0003] In the prior art, for the water-to-water heat pump system, its core equipment is the water-to-water heat pump hot water unit, which is used for energy cascade utilization. High-efficiency water-to-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...

Claims

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Application Information

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Patent Type & Authority Applications(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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