Triple-effect heat recovery type mixed-air type heat pump drying system and application thereof

A heat pump drying and heat recovery technology, applied in heat recovery systems, drying, heat pumps, etc., can solve the problem of insufficient heat recovery, unrecovered cold energy loss, and inability to reheat to normal return air temperature (phase change temperature requires Lower than the return air temperature and other issues, to achieve the effect of low inlet air temperature, improved dehumidification energy efficiency, and improved energy utilization

Active Publication Date: 2020-12-08
TONGJI UNIV
View PDF9 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN107130415B discloses a device that utilizes heat pipes to transfer cold energy after the evaporator to pre-cool the return air in the field of clothes drying. at the return air temperature), that is, only part of the cold energy after cooling and

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Triple-effect heat recovery type mixed-air type heat pump drying system and application thereof
  • Triple-effect heat recovery type mixed-air type heat pump drying system and application thereof
  • Triple-effect heat recovery type mixed-air type heat pump drying system and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0050] Example 1

[0051] In this embodiment, the three-effect heat recovery type mixed air heat pump drying system (see image 3 ), including loop heat pipe, refrigerant cycle and air cycle.

[0052] The loop heat pipe includes the refrigerant channel of the precooler 1 and the refrigerant channel of the reheater 2 which are connected in circulation. The precooler 1 and the reheater 2 are connected, and refrigerant flows inside. The flow of refrigerant between precooler 1 and reheater 2 is driven by gravity / capillary forces or pumps, depending on the type of heat pipes used in the implementation.

[0053] The refrigerant cycle includes the refrigerant channel of the evaporator 3, the compressor 8, the refrigerant channel of the condenser 7, the refrigerant channel of the subcooling reheat coil 5, and the throttling element 4, which are connected in sequence. It is connected with the refrigerant channel of the evaporator 3 to form a cycle.

[0054] In the refrigerant cycle...

Example Embodiment

[0061] Example 2

[0062] This embodiment also adopts the three-effect heat recovery of loop heat pipe, evaporator and subcooling reheating coil. Figure 5 , Image 6 shown. In the first return air passage 11, the air flows through the loop heat pipe precooler 1 to cool down and the evaporator 3 to cool and dehumidify (state A→A'→B) in sequence, and then flows through the cold reheat coil 5 and the loop heat pipe The reheater 2 reheats to the normal return air temperature (state B→B"→B').

[0063] Compared with Embodiment 1, only the sequence of the loop heat pipe reheater 2 and the supercooling reheat coil 5 along the air flow path is different, and the loop heat pipe reheater 2 is arranged behind the supercooling reheat coil 5 . In this embodiment, the deep recovery of cold energy by the subcooling and reheating coil 5 is prioritized, and the functions of the loop heat pipe and the subcooling and reheating coil are not changed.

Example Embodiment

[0064] Example 3

[0065] This embodiment adopts the three-effect heat recovery of the loop heat pipe, evaporator and subcooling reheating coil, wherein the subcooling reheating coil is provided with a first-level subcooling reheating coil 5-1 and a second-level subcooling reheating coil The two-stage deep cooling energy recovery of pipe 5-2, the system schematic diagram and the psychrometric diagram of the air condition are as follows Figure 7 , Figure 8 shown. In the first return air channel 11, the air flows through the loop heat pipe precooler 1 to cool down and the evaporator 3 to cool and dehumidify (state A→A'→B), and the low-temperature return air after the evaporator 3 passes through the first stage in sequence. The cold energy recovery of the cold reheating coil 5-1, the loop heat pipe reheater 2 and the secondary subcooling reheating coil 5-2 (state B→B1”→B’→B2”) is reheated to Normal return air temperature.

[0066] Compared with Embodiment 1, the first-stage...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a triple-effect heat recovery type mixed-air type heat pump drying system and an application thereof. Loop heat pipes are arranged before and after an evaporator in refrigerant circulation to achieve energy transfer between return air, and the loop heat pipes utilize part of cold energy after mechanical dehumidification to pre-cool the return air in air circulation to conduct preliminary heat and humidity recovery; the temperature of the return air flowing to the evaporator in the air circulation is reduced to a dew point, water vapor in the return air is condensed, and the evaporator deeply recovers wet effect latent heat in the return air; the refrigerant circulation and the air circulation further comprise a supercooling reheating coil pipe, and the supercoolingreheating coil pipe deeply recovers residual cold energy in the return air passing through the loop heat pipes and the evaporator. Compared with the prior art, after exhaust air of a drying room is introduced into a heat pump system, preliminary heat and humidity recovery of the loop heat pipes, deep latent heat recovery of the evaporator and deep cold energy recovery of the supercooling reheating coil are sequentially adopted, and the energy utilization rate in the drying process is greatly increased.

Description

technical field [0001] The invention relates to a heat pump drying system, in particular to a three-effect heat recovery type mixed air heat pump drying system and its application. Background technique [0002] A closed drying system based on heat pump technology, such as an internal circulation heat pump for vegetable dehydration and drying disclosed in CN101695404A, uses the heat pump evaporation end to cool and dehumidify the exhaust air of the drying room, thereby recovering a large amount of dry hot air from the product The latent heat of water vapor, the energy utilization rate of the drying process is high, and the dehumidification per unit energy consumption is 3 to 4 times that of the electric heating system. [0003] Many drying industries have high air volume process requirements, such as seaweed / laver drying, which requires a large amount of hot air to enter the drying room quickly to ensure that the dried seaweed / laver is flat and not easy to break. Under the c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F26B23/00F25B30/06F25B41/06
CPCF26B23/005F25B30/06Y02B30/52Y02P70/10
Inventor 成家豪张春路曹祥
Owner TONGJI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap