Drying System Preheating Heat Exchanger for Year-Round Efficiency
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Solution Overview
Problem
Conventional air-to-air heat exchangers in drying systems are inefficient during summer months due to oversizing for winter operation, leading to high energy consumption and heat loss, as they are designed for winter temperatures and cannot effectively utilize waste heat year-round.
Innovation Solution
Integration of a preheating heat exchanger to regulate fresh air inlet temperature, allowing for year-round efficient operation by simulating summer conditions, reducing temperature gradients, and optimizing energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the air-to-air heat exchanger is dimensioned for winter operation to preheat fresh air to the highest possible temperature, then the fresh air preheating efficiency is improved in cold months, but the heat exchanger becomes oversized and uneconomical during summer months with high outside temperatures
Solution Approach 1:
The air-to-air heat exchanger is divided into multiple independent heat exchange modules or sections, each capable of operating at different capacity levels. This segmentation allows the system to activate only the necessary number of modules based on seasonal requirements, avoiding the inefficiency of operating an oversized unit at partial load during summer while maintaining adequate preheating capacity during winter.
2Temperature
If the air-to-air heat exchanger operates with a large temperature gradient of 50 degrees Celsius between winter and summer dimensioning basis, then winter preheating performance is optimized, but summer energy recovery becomes uneconomical due to oversizing
Solution Approach 1:
The heat exchanger system incorporates dynamic capacity adjustment mechanisms such as variable speed fans, adjustable flow diverters, or modulating heat exchange surfaces that can adapt the temperature gradient and heat transfer rate to match seasonal requirements. This allows the system to maintain optimal temperature differences for winter preheating while reducing the effective heat exchange capacity during summer when smaller temperature gradients exist, preventing energy waste from oversized operation.
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
The system achieves up to 30% higher energy yield with the same input, reduces primary energy consumption, and enables efficient utilization of waste heat throughout the year, enhancing the overall efficiency of the drying process.
Implementation Method 1
The drying system (1) comprises a preheating heat exchanger (10) with a preheating volume (11) and a preheating flow volume (12), wherein the preheating heat exchanger (10) is designed to heat the fresh air, in particular ambient air, from an outside temperature to the regulated fresh air inlet temperature
Implementation Method 2
the LLW exhaust air volume and the LLW fresh air volume are designed such that heat from the LLW exhaust air volume to the LLW fresh air volume is transferable to heat the fresh air
Implementation Method 3
the fresh air, which is heated at least by the air-to-air heat exchanger and at least indirectly discharged from the LLW fresh air flow arrangement, interacts with the drying medium as drying air and absorbs evaporated moisture from the drying medium
Data Source
Figure 1
AI summary
The invention relates to a drying system (1) for drying a drying medium, comprising: - an air-to-air heat exchanger (AHE) (20), which includes: - an inlet AHE exhaust air flow arrangement (100), - an outlet AHE exhaust air flow arrangement (200), - an inlet AHE fresh air flow arrangement (2000), - an outlet AHE fresh air flow arrangement (3000); - a drying system (30) for drying the drying medium, wherein the fresh air, heated at least by the air-to-air heat exchanger (20) and discharged at least indirectly from the AHE fresh air flow arrangement (3000), interacts with the drying medium as drying air and absorbs evaporated moisture from the drying medium and discharges it as moisture-laden exhaust air (K) to an exhaust air duct arrangement (5000); - a preheating heat exchanger (10) for heating fresh air from an outside temperature (T_A) to the controlled fresh air inlet temperature (T_G);- a supply air duct arrangement (1000) for supplying fresh air at the outside temperature (T_A), wherein the supplying LLW fresh air flow arrangement (2000) connects the preheating heat exchanger (10) to the air-to-air heat exchanger (20) to provide the fresh air at the controlled fresh air inlet temperature (T_G) for the air-to-air heat exchanger (20).