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Temperature/humidity field collaborative multi-heat-exchanger heat pump drying system and control method thereof

A technology of heat pump drying and field coordination, which is applied in drying, heat pumps, dryers, etc., to achieve the effects of maintaining heat balance, improving dehumidification energy efficiency, and high energy efficiency

Inactive Publication Date: 2021-05-28
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a multi-heat exchanger heat pump drying system with coordinated temperature / humidity field and its control method in order to overcome the above-mentioned defects in the prior art, which solves the problem of air volume matching, Problems with heat balance and temperature / humidity field coordination

Method used

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  • Temperature/humidity field collaborative multi-heat-exchanger heat pump drying system and control method thereof
  • Temperature/humidity field collaborative multi-heat-exchanger heat pump drying system and control method thereof
  • Temperature/humidity field collaborative multi-heat-exchanger heat pump drying system and control method thereof

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Experimental program
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Effect test

Embodiment 1

[0068] The temperature / humidity field coordinated multi-heat exchanger heat pump drying system in this embodiment (see figure 2 ), including refrigerant cycle and air cycle.

[0069] The refrigerant cycle includes the refrigerant channel of the evaporator 3, the compressor 4, the refrigerant channel of the first condenser 5-1, the refrigerant channel of the second condenser 5-2, the refrigerant channel of the subcooler 5-3, which are connected in sequence. Refrigerant channel and throttling element 6, the throttling element 6 is connected with the refrigerant channel of the evaporator 3 to form a cycle;

[0070] The air circulation includes the first return air passage and the second return air passage in parallel; the first air return passage of the air circulation includes the sequential connection of the drying room 1-0, the circulation fan 7-0, and the pre-cooling water coil 2-0. Air passage, the air passage of evaporator 3, the air passage of subcooler 5-3, the first bl...

Embodiment 2

[0080] The basic system principle in this embodiment is consistent with that of Embodiment 1, and a variety of similar air supply modes in the drying room (air supply after external mixing, internal mixing of segmented air supply, and external mixing of segmented air supply) can also be realized.

[0081] see Figure 5 , the main difference of this embodiment is that the multiple heat exchangers adopt different arrangements and connection forms to achieve air supply states with different temperatures and humidity, and to meet the needs of material drying. In this embodiment, the first condenser 5-1 and the second condenser 5-2 in the refrigerant cycle are connected in parallel to heat the return air in the first and second return air passages to a similar temperature, and the first condenser 5 -1. The refrigerant at the outlet of the second condenser 5-2 is mixed by the confluence valve 9, then flows through the cooler 5-3 for subcooling, and then returns to the air at low tem...

Embodiment 3

[0083] The basic system principle in this embodiment is consistent with that of Embodiment 1, and a variety of similar air supply modes in the drying room (air supply after external mixing, internal mixing of segmented air supply, and external mixing of segmented air supply) can also be realized.

[0084] see Figure 6 , the main difference of this embodiment is that the multiple heat exchangers adopt different arrangements and connection forms to achieve air supply states with different temperatures and humidity, and to meet the needs of material drying. In this embodiment, the series sequence of the first condenser 5-1 and the second condenser 5-2 is changed in the refrigerant cycle, and the refrigerant discharged from the compressor 4 first flows through the second condenser 5-2, and the superheated The steam cools down and condenses to release heat, heats the return air in the second return air passage to the highest temperature, then flows through the first condenser 5-1 ...

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Abstract

The invention relates to a temperature / humidity field collaborative multi-heat-exchanger heat pump drying system and a control method thereof. A whole system comprises a refrigerant cycle and an air cycle, and the refrigerant cycle comprises a refrigerant channel of an evaporator, a compressor, a refrigerant channel of a condensation assembly and a throttling element which are connected in sequence; and the air cycle comprises a first air return channel and a second air return channel which are connected in parallel, air channels of the condensation assembly are connected with the specific height positions of a drying room to achieve matching of the air supply state and the material drying characteristics, a first draught fan and a second draught fan are connected to specific positions of the air channels of the condensation assembly, and in the way, even matching of the refrigerant temperature and the return air temperature in heat pump cycle is achieved in the differentiated air supply state. Compared with the prior art, the practical problems in the aspects of air volume matching and heat balance in the prior art are solved, and temperature / humidity field cooperation with the matched air supply state and material drying characteristics is achieved.

Description

technical field [0001] The invention relates to a heat pump drying system, in particular to a multi-heat exchanger heat pump drying system with coordinated temperature / humidity fields and a control method thereof. Background technique [0002] Heat pump drying has become a hot technology in the field of industrial and agricultural drying in recent years. Compared with natural drying, the efficiency and quality of drying have been greatly improved. Compared with electric heating and boiler equipment, it can save more than 50% of primary energy and reduce exhaust gas emissions. [0003] The vapor compression closed heat pump drying system is compact in structure, easy to integrate and widely used. Its basic form is as figure 1 As shown, the dry hot air flows through the material to evaporate the water contained in it to achieve drying. Driven by the circulating fan, the return air with low temperature and high humidity flows through the evaporator to cool down to a temperatur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B21/00F26B21/04F26B23/00F26B25/00F26B9/02F25B30/02
CPCF25B30/02F26B9/02F26B21/002F26B21/04F26B23/005F26B25/005
Inventor 曹祥成家豪张春路
Owner TONGJI UNIV
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