Clothes drying system based on carbon dioxide transcritical heat pump cycle system

Abstract

A clothes drying system based on a carbon dioxide transcritical heat pump cycle system comprises a carbon dioxide transcritical heat pump cycle system, an air circulation system, a drying room, a control system and a system shell. A compressor, a gas cooler, a subcooler, a once throttling gear, a precooler, a secondary throttling gear, an evaporator and a liquid-gas separator are sequentially connected to form the heat pump cycle system through pipelines. A circulating fan, a gas cooler air inlet, a drying room air inlet, a filter, a precooler air inlet and an evaporator air outlet are sequentially connected to form the air circulation system through air ducts. The clothes drying system based on a carbon dioxide transcritical heat pump cycle system has the advantages of causing no harm to environment, being capable of providing wide temperature scope, suitable for different fabrics, and capable of reducing throttling loss of the carbon dioxide and improving circulation efficiency of the system.

Description

technical field [0001] The invention belongs to the technical field of heat pumps, in particular to CO 2 A transcritical heat pump circulation system and a clothes drying device using the circulation system. Background technique [0002] As a new energy technology, heat pump technology is an energy transfer device that is different from energy conversion methods such as electric heating and PTC heating. At the cost of consuming part of the energy, heat is absorbed from the low-level heat source, and then the consumed energy and the absorbed heat are transferred to the high-level heat source to achieve the purpose of heating. Heat pump technology is widely used as a way of heating in winter in air conditioning. A conventional heat pump cycle system includes a compressor, a condenser, a throttling device, an evaporator, a four-way reversing valve, and a control system. All components are connected by pipelines. Together, through the conversion of the four-way reversing valve...

AI Technical Summary

Problems solved by technology

The existing dryers have the following problems: ① The energy consumption index is not ideal

First of all, it is in the form of fresh air, and the exhausted air still contains a lot of heat energy, which will cause a waste of energy; secondly, whether the existing clothes dryers are electric heating or PTC heating, they are all energy conversion devices, that is, the water in the clothes evaporates. The heat required is completely converted from electrical energy

②The working temperature in the drying process is high, generally above 60°C, which will cause great damage to high-grade clothing materials such as silk and cashmere, which limits its application range

③ Clothes dryers are often used in rainy weather, when the ambient humidity is high, but some types of clothes dryers will discharge the moist air after absorbing moisture into the room, which will further deteriorate the indoor air condition

The disadvantage of the above-mentioned clothes dryers using heat pump technology is that although they all use heat pump systems to realize the energy cycle of drying clothes, their heat pump systems are all conventional subcritical vapor compression refrigeration cycles, and most of them use HCFC22, HFC134a refrigerants, HCFC22 Refrigerants have a destructive effect on the ozone layer. Developed countries have restricted their use, and my country will not allow them to be used after 2030. Although HFC134a does not damage the ozone layer, its GWP value is 1200, which is also a transitional product.

At the same time, the heat pump cycle of HCFC22 and HFC134a is limited by the exhaust temperature of the refrigerant. Generally, the air temperature of drying clothes is below 50°C, the drying time is longer, and the scope of application is relatively small. The heat is unbalanced, so the energy balance cannot be achieved when the closed air circulation is used. If the balance is not assisted, the temperature will rise and the work will be unstable, which will have a certain impact on the indoor environment.

Images