High temperature air source heat pump hot-air fan used for drying

Abstract

The present invention discloses a high temperature air source heat pump air heater used for drying, which comprises an air source heat pump and an air fan. The air source heat pump is mainly composed by connecting an evaporator, a compressor, a condenser, a main throttling device in sequence with the working substance circulating pipe. The value range of the ratio between the heat exchanging area of the air source heat pump and the input power of the compressor is 5.4-16m / kw. The value range of the ratio between the heat exchanging area of the condenser and the input power of the compressor is 4-12m / kw. The hot-air fan is also installed with a decompression dividing valve and an auxiliary throttling device. The condenser adopts the multi-path working substance pipe for forming a three-dimensional heat exchanging area which is provided with a plurality of layers of heat exchanging surfaces in the up-and-down direction and is provided with a plurality of heat exchanging intervals in the front-and-back direction. The technical solution of the invention has the advantages of greatly increased wind outlet temperature, stable operation of system, higher energy efficiency ratio and positive meaning for saving energy and reducing emission.

Description

technical field [0001] The invention relates to an air source heat pump fan for drying, in particular to a high temperature air source heat pump fan. Background technique [0002] The air source heat pump is mainly composed of compressor, evaporator, throttling device, condenser, working fluid circulation pipeline and other parts. Based on the principle of the reverse Carnot cycle, it is driven by electric energy, and effectively absorbs the unusable low-grade heat energy in the air through the heat transfer medium, and upgrades it to the available high-grade heat energy for use. Its working process: ①The heat transfer working medium enters the evaporator, and the working medium absorbs heat and evaporates in the evaporator. At this time, the working medium absorbs heat from the low-temperature heat source and then enters the compressor; ②After the working medium is compressed and heated by the compressor, The working fluid that becomes high temperature and high pressure is...

AI Technical Summary

Problems solved by technology

[0007] The heat exchange area of ​​the evaporator of the existing device is small, the heat energy absorbed from the environment is limited, and it cannot provide the heat and temperature required for drying materials

[0008] 2. The ability to output heat energy is limited and the heating temperature is low:

[0009] The heat transfer area of ​​the condenser used in the existing device is small, resulting in limited heat carrying capacity and heat transfer capacity of the condenser, and low heat transfer efficiency

When the ambient temperature is high, the absorbed heat cannot be output in a timely and effective manner, which instead causes the internal temperature and pressure of the working medium circulation system to be too high, the compressor runs continuously under high pressure, frequent over-pressure protection stops, and the system cannot operate normally , it is difficult to achieve the purpose of drying

[0010] 3. Low wind speed

The wind speed of the air outlet of the air conditioner is about 4m / s, which cannot meet the drying requirements

[0012] 4. Low energy efficiency ratio

[0013] From the perspective of energy saving, it is required that the heating device has a high energy efficiency ratio, that is, a high COP value (for heating, the ratio of heating capacity to input power is defined as the cycle performance coefficient COP of the heat pump. Under the same working conditions, the higher the ratio It means that the higher the efficiency of the system, the more energy-saving). The COP value of the existing air conditioner is in the heating state, and the energy efficiency ratio is only about 2.3 when the ambient temperature is 7°C

Images