CN-119713811-B - Heat pump dryer detection system and method thereof

CN119713811BCN 119713811 BCN119713811 BCN 119713811BCN-119713811-B

Abstract

The invention discloses a heat pump dryer detection system and a method thereof, which relate to the technical field of heat pump systems and comprise an inner temperature and humidity sensor, an outer temperature sensor and an inner temperature sensor, wherein the inner temperature and humidity sensor is arranged at an evaporator and a compressor; the temperature loss model simulates the temperature loss of air flowing in the heat pump dryer through the condenser, the evaporator, the fan, the inner temperature and humidity sensor and the outer temperature and humidity sensor, calculates the temperature loss generated by the condenser, the evaporator and the air flowing respectively, and the scheduling unit determines the adjustment parameters of the condenser, the evaporator and the fan through the set temperature and humidity parameters of the control system and the temperature loss generated by the condenser, the evaporator and the air flowing. The power of the evaporator and the condenser can be adjusted according to the set temperature of the control system of the heat pump dryer when frosting and dirt of the evaporator and the condenser influence heat conduction.

Inventors

Lai xiaohe
CHEN JINCHENG
WU XUEJUN

Assignees

佛山市索兰普电器实业有限公司

Dates

Publication Date: 20260508
Application Date: 20241224

Claims (7)

1. A detection system of a heat pump dryer, which is composed of a condenser for heating air, an evaporator for evaporating refrigerant, a compressor for compressing refrigerant, a fan for air flow and a control system for controlling the operation of the condenser, the evaporator, the compressor and the fan, wherein the heat pump dryer is communicated with a drying chamber, and the detection system is characterized in that: The internal temperature and humidity sensor is arranged at the evaporator and the compressor and used for acquiring air temperature and humidity data inside the evaporator and the compressor; The outer temperature and humidity sensor is arranged at the communication position of the heat pump dryer and the drying chamber and used for acquiring the temperature and humidity data of outlet gas of the heat pump dryer; the interaction unit is used for carrying out data interaction with the control system to obtain working parameters of the condenser, the evaporator and the fan; The processing unit is used for calculating standard temperature and humidity data of the corresponding area based on working parameters of the condenser and the evaporator; The temperature loss model simulates the temperature loss of air flowing in the heat pump dryer through the condenser, the evaporator, the fan, the inner temperature and humidity sensor and the outer temperature and humidity sensor, and calculates the temperature loss generated by the condenser, the evaporator and the air flowing respectively; The scheduling unit is used for determining the adjustment parameters of the condenser, the evaporator and the fan by controlling the set temperature and humidity parameters of the system and combining the temperature loss generated by the condenser, the evaporator and the air flow; generating a temperature change curve chart by the air temperature and humidity data and the outlet gas temperature and humidity data, and recording working parameters of an evaporator, a condenser and a fan corresponding to the temperature and humidity data by the temperature curve chart; Standard temperature and humidity data corresponding to different powers of the evaporator and the condenser are calculated through the power, the air mass flow and the specific heat capacity: The working power of the evaporator is calculated corresponding to standard temperature data: ; wherein, deltaT z is the air standard temperature, Q z is the evaporator power, the unit is KW, m is the air mass flow, the unit is kg/s, c p is the specific heat capacity of air, the unit is kJ/kg.K; the working power of the evaporator is calculated according to standard humidity data: ; wherein ΔW z is the air standard humidity, h fg is the latent heat of evaporation of water; The working power of the condenser is calculated corresponding to standard temperature data: ; Where ΔT l is the air standard temperature, Q l is the evaporator power in kW.
2. The heat pump dryer detection system of claim 1 wherein temperature flow rate loss due to movement of air within the heat pump dryer is calculated based on fan operating parameters: ; Wherein, the Is the air density, A is the cross-sectional area of the duct, v is the air velocity, Is the pressure loss and Q is the volumetric flow.
3. The heat pump dryer detection system of claim 2 wherein the temperature loss model obtains air temperature and humidity data detected by the internal temperature and humidity sensor, calculates temperature change loss between the air temperature and humidity data and standard temperature and humidity data: evaporator temperature loss: ; wherein DeltaT z1 is evaporator temperature data detected by internal temperature and humidity sensing; Condenser temperature loss: ; Wherein, deltaT l1 is the condenser temperature data of interior temperature and humidity sensing detection.
4. A heat pump dryer detection system according to claim 3, wherein the control system sets a target drying temperature for the heat pump dryer, calculates the power of the condenser and evaporator based on Wen Bianwen degrees of loss: evaporator power: ; Condenser power: ; Evaporator power Q z,adj and condenser power Q l,adj are the powers required to reach the target drying temperature.
5. The heat pump dryer detection system of claim 4 wherein the air flow temperature loss is calculated by an inner temperature and humidity sensor and an outer temperature and humidity sensor: ; wherein Δt 2 is the outlet gas temperature data.
6. A heat pump dryer detection method for use in a heat pump dryer detection system as claimed in claim 5, comprising the steps of: the interaction unit obtains the power of the control system for controlling the condenser, the evaporator and the fan; acquiring air temperature and humidity data detected by an inner temperature and humidity sensor and outlet gas temperature and humidity data detected by an outer temperature and humidity sensor; calculating standard temperature and humidity data through the power of the condenser and the evaporator; Calculating the temperature change loss of the condenser and the evaporator; calculating the power required for reaching the target drying temperature of the control system based on Wen Bianwen DEG loss; Calculating the flow temperature loss; the adjustment parameters of the condenser, evaporator and fan are calculated based on the flow temperature loss.
7. The method of claim 6, wherein the limiting temperature and power of the condenser and the evaporator are set, and the maximum duration of the limiting temperature and power is determined, and the condenser and the evaporator can be independently and synchronously adjusted.

Description

Heat pump dryer detection system and method thereof Technical Field The invention relates to the technical field of heat pump systems, in particular to a heat pump dryer detection system and a heat pump dryer detection method. Background The temperature, humidity and exhaust pressure of the heat pump dryer exceed the safety threshold values, and a series of risks and problems are brought to equipment and operators, wherein the temperature exceeding the safety threshold values can cause overheating of the equipment, influence the drying efficiency, damage the equipment, fire or other safety accidents can be caused by high temperature, the drying effect can be influenced by the excessive humidity, frost can be formed in the equipment, normal operation of the equipment is influenced by the excessive humidity, damage to an exhaust system and even explosion risks can be caused by the excessive exhaust pressure, and the energy efficiency of the equipment can be influenced by the excessive exhaust pressure. Publication number CN109282546B discloses a heat pump dryer detection method and system. The detection method of the heat pump dryer comprises the steps of detecting an exhaust pressure value of a compressor by an exhaust pressure detection device, detecting an exhaust temperature value of the compressor by an exhaust temperature detection device, judging whether the exhaust pressure value is larger than or equal to an exhaust pressure safety threshold value by a judgment device, and judging whether the exhaust temperature value is larger than or equal to the exhaust temperature safety threshold value by the judgment device. The control device controls the running state of the heat pump dryer according to the judging result of the judging device. The exhaust pressure detection device and the exhaust temperature detection device are used for detecting the exhaust pressure value and the exhaust temperature value of the compressor in real time under the combined action. When any one of the exhaust pressure value or the exhaust temperature value exceeds a set threshold value, the control device controls the heat pump dryer to be in a shutdown state. And the damage to equipment caused by the continuous operation of the heat pump dryer is avoided. The heat pump dryer realizes the control to the air temperature through condenser and evaporimeter, and condenser and evaporimeter can appear the problem of temperature loss, and the settlement temperature of drying-machine produces the difference with the actual temperature that gets into the drying chamber inside. Temperature control of a heat pump dryer is roughly divided into two control methods: firstly, according to the set temperature, the condenser and the evaporator change parameters such as power and the like to enable the air to reach the corresponding temperature, but as the temperature of flowing air is larger and larger from the set temperature after frosting or dirt accumulation of the condenser and the evaporator, a larger difference is generated between the temperature finally entering the drying chamber and the set temperature; Secondly, the exhaust temperature of the heat pump dryer is detected, after frosting and dirt accumulation of the condenser and the evaporator, the condenser and the evaporator need to be set, the condenser and the evaporator need to be operated with larger power to reach the set exhaust temperature, and the condenser and the evaporator can be operated with full power, so that the loss of equipment is accelerated, and the service life is reduced. Thus, a single detection of the discharge pressure and temperature cannot determine the temperature loss of the condenser and evaporator. Disclosure of Invention One of the purposes of the present invention is to provide a heat pump dryer detection system and method thereof, which determines the temperature loss of a condenser and an evaporator during the operation of the heat pump dryer, and adjusts the condenser and the evaporator according to the set temperature and the temperature loss change. The heat pump dryer is formed by a condenser for heating air, an evaporator for evaporating refrigerant, a compressor for compressing refrigerant, a fan for air flow and a control system for controlling the operation of the condenser, the evaporator, the compressor and the fan, wherein the heat pump dryer is communicated with a drying chamber; The detection system comprises: The internal temperature and humidity sensor is arranged at the evaporator and the compressor and used for acquiring air temperature and humidity data of the evaporator and the compressor; The outer temperature and humidity sensor is arranged at the communication position of the heat pump dryer and the drying chamber and used for acquiring the temperature and humidity data of outlet gas of the heat pump dryer; the interaction unit is used for carrying out data interaction with the control system to obtain working parameters of