Heat Pump Ejector Vacuum Dryer for Wood
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional dryers, such as vacuum wood dryers, suffer from high energy consumption and carbon emissions due to inefficient heating processes, which account for over 55% of onsite energy use and contribute significantly to greenhouse gas emissions.
Innovation Solution
A combined compressor-ejector heat pump system integrating vapor compression cycle, ejector cycle, and super-conductance oscillating heat pipe (OHP) technologies with cap-end vapor refrigerant condensation heating and highly-efficient water vapor condensation energy recovery, creating a closed energy loop for efficient energy utilization and zero carbon emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional vacuum wood dryers use steam heating, then drying function is achieved, but energy consumption increases and carbon emissions increase
Solution Approach 1:
The patent utilizes phase transitions of refrigerant (liquid-vapor condensation) to generate heating vapor that directly dries wood, replacing steam heating. The refrigerant condenses on the drying chamber walls, releasing latent heat to evaporate wood moisture, achieving efficient drying with lower energy consumption and zero carbon emissions.
Solution Approach 2:
The patent replaces the mechanical steam generation and circulation system with an electrical heat pump system. The heat pump uses electrical energy to drive refrigerant circulation through evaporator and condenser components, eliminating the need for gas furnaces and steam production, thereby reducing both energy consumption and carbon emissions.
2Productivity
If conventional vacuum wood dryers use steam heating, then drying function is achieved, but carbon emissions increase
Solution Approach 1:
The patent replaces the mechanical steam generation system with an electrical heat pump system that uses refrigerant phase changes to provide heating. This substitution eliminates combustion-based steam production and associated carbon emissions, achieving zero carbon emission drying while maintaining effective wood drying function.
Solution Approach 2:
The refrigerant undergoes phase transitions (evaporation and condensation) to transfer thermal energy to the drying chamber. The condensation process releases latent heat that directly evaporates wood moisture, providing an efficient, carbon-free alternative to steam heating that eliminates harmful carbon emissions.
3Productivity
If conventional dryers use steam heating, then drying is achieved, but drying time is long
Solution Approach 1:
The patent employs refrigerant phase transitions (liquid to vapor in evaporator, vapor to liquid in condenser) to rapidly transfer thermal energy to the drying chamber. This phase change mechanism enables faster heat transfer compared to conventional steam heating, significantly reducing drying time while achieving complete moisture removal from wood.
Solution Approach 2:
The heat pump system operates continuously, with refrigerant constantly circulating through evaporator and condenser components. This continuous phase transition cycle maintains steady heat transfer to the drying chamber, ensuring consistent and efficient drying progress throughout the entire drying process, thereby reducing total drying time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system achieves extra-high energy efficiency, reduces drying time, and minimizes carbon emissions by utilizing electrical energy only, providing uniform heating and preventing wood cracking through temperature uniformity, while significantly cutting down energy consumption and emissions.
Implementation Method 1
super-conductance oscillating heat pipe (OHP)
Implementation Method 2
cap-end vapor refrigerant condensation heating
Implementation Method 3
compressor having an input that is in fluid connection to an output of the first evaporator
Implementation Method 4
ejector that receives a primary high-pressure vapor stream from an output of the compressor and receives a secondary low-pressure vapor stream from the output of the second evaporator and generates as output a high-temperature vapor
Implementation Method 5
cap-end vapor refrigerant condensation heating
Implementation Method 6
evaporator section of the plurality of OHPs
Data Source
AI summary
An efficient heat pump ejector vacuum dryer system and associated method of use for drying items that includes a drying vessel having a condenser and having a first evaporator where the first evaporator has an input that is connected to an output of the first expansion valve, a first expansion valve connected in fluid communication between the condenser and the first evaporator, a second expansion valve connected between the condenser and the second evaporator, a compressor having an input connected to an output of the first evaporator, an ejector that receives a vapor stream from an output of the compressor and receives a vapor stream from the output of the second evaporator generates as an output a high-temperature vapor provided to a condenser of the drying vessel to dry the items and generate an output of moisture, and a water reservoir that accumulates water from the drying vessel.