HVAC Grain Dryer with Recirculated Air and Even Heat Distribution
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Solution Overview
Problem
Traditional continuous-flow grain drying systems using high-temperature gas burners are inefficient, environmentally harmful due to high CO2 emissions, and result in uneven heat distribution, leading to grain burning and reduced quality.
Innovation Solution
The implementation of HVAC units with electrically powered compressors, fans, condensers, expansion valves, and refrigerant pipes to dehumidify and dry grains, utilizing refrigerant materials and recapturing heat for efficient grain drying with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature gas burners are used to dry grain, then drying efficiency is improved, but CO2 emissions increase and environmental harm worsens
Solution Approach 1:
The patent changes the fundamental parameter of heating method from direct gas combustion to electric heating elements. The heating elements operate at controlled temperatures rather than extreme burner temperatures, maintaining drying efficiency while eliminating CO2 emissions from fuel combustion. This parameter change transforms the system from fossil-fuel-dependent to electrically-powered thermal processing.
Solution Approach 2:
The patent substitutes the mechanical combustion system (gas burners) with an electrical heating system. Instead of relying on chemical combustion processes to generate heat, the system uses electrically-powered heating elements that convert electrical energy directly to thermal energy, thereby eliminating the harmful emissions associated with gas combustion while maintaining the necessary thermal energy input for drying.
2Productivity
If high-temperature gas burners are used to dry grain, then drying speed is improved, but energy efficiency deteriorates due to heat loss
Solution Approach 1:
The patent captures and utilizes the moisture-laden air that would otherwise be wasted. The system recirculates this air through the heating elements, extracting additional moisture from the grain on subsequent passes. This converts what would be energy-wasting exhaust into a useful drying medium, improving overall energy efficiency while maintaining drying speed.
Solution Approach 2:
The patent implements a continuous recirculation system where air is continuously heated and passed over the grain, then recaptured and reheated. This continuous cycle ensures that the thermal energy is utilized multiple times rather than being lost in a single pass, maintaining high drying speed while significantly reducing total energy consumption compared to continuous fresh air intake and heating.
3Productivity
If high-temperature gas burners are used to dry grain, then moisture removal is improved, but heat distribution becomes uneven causing grain burning
Solution Approach 1:
The patent divides the heating function into multiple distributed heating elements positioned throughout the grain flow path rather than relying on a single high-temperature burner. This segmentation allows heat to be applied at multiple locations simultaneously, ensuring more uniform heat distribution across the grain mass while maintaining effective moisture removal rates.
Solution Approach 2:
The patent positions heating elements at specific locations where they can directly contact or closely approach the grain flow. Each heating element provides localized heating tailored to the moisture content and flow characteristics at that specific position, ensuring uniform overall heat distribution and preventing localized overheating that would cause grain burning.
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 approach reduces energy costs, minimizes environmental impact, and ensures even heat distribution, preventing grain burning and improving product quality by using lower heat levels for drying.
Implementation Method 1
The HVAC units can also dehumidify the air within the tank, and can generate cold air
Implementation Method 2
Each of the HVAC units can include an electrically powered compressor, a fan, a condenser, an expansion valve, and an evaporator
Implementation Method 3
Each of the HVAC units can include an electrically powered compressor
Implementation Method 4
an expansion valve, and an evaporator that are each connected by a set of refrigerant pipes
Data Source
AI summary
A grain dryer includes a housing having a top end, a bottom end, and a plurality of walls that define an interior space. A grain funnel is positioned along the top end of the main housing, and a grain discharge member is positioned along the bottom end of the housing. One or more HVAC units are provided. Each of the HVAC units including an electrically powered compressor, a fan, a condenser, an expansion valve, and an evaporator that are each connected by a set of refrigerant pipes that are filled with a refrigerant material. Hot air generated by the HVAC units is supplied to a plurality of supply vents positioned along the main housing, and cold air generated by the HVAC units is supplied to a plurality of return vents positioned along the main body at a location adjacent to the discharge member.