Adsorption Heat Pump Pressure Staging for Lower Sensible Heat Loss
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Solution Overview
Problem
Adsorption heat pumps face challenges in achieving efficient cooling generation due to large temperature differences between adsorption and desorption in adsorption devices, leading to significant losses from sensible heat.
Innovation Solution
An adsorption heat pump system with a vapor supply member that evaporates the adsorbate and supplies it to first and second adsorption devices at different pressures, allowing for efficient adsorption and regeneration, and utilizing adsorbents with minimal temperature difference between adsorption and desorption to reduce heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large temperature difference (temperature swing) is used between adsorption and desorption in the adsorption devices, then the adsorption capacity increases, but the loss due to sensible heat increases significantly
Solution Approach 1:
The system divides the single adsorption device into two separate adsorption devices operating at different pressures. This segmentation allows each device to operate with optimized temperature swings appropriate to its pressure level, reducing the overall sensible heat loss while maintaining total adsorption capacity.
Solution Approach 2:
The invention changes the operating parameters by introducing different pressure levels for the two adsorption devices. The first adsorption device operates at a higher pressure with a smaller temperature swing, while the second operates at lower pressure with a larger temperature swing. This parameter differentiation resolves the contradiction between adsorption capacity and sensible heat loss.
2Quantity of substance
If the pressure is increased during adsorption to adsorb more adsorbate, then the adsorption capacity increases, but the system complexity increases
Solution Approach 1:
The invention merges the vapor supply function and pressure differentiation into a single evaporator unit that serves both adsorption devices. The evaporator generates vapor at different pressures that are simultaneously supplied to the first and second adsorption devices, achieving pressure differentiation without requiring separate complex vapor generation systems.
Solution Approach 2:
The evaporator performs multiple functions: it generates adsorbate vapor, differentiates pressure levels, and supplies vapor to both adsorption devices. This multi-functionality reduces the overall system complexity while achieving the goal of increased adsorbate adsorption through pressure control.
3Device complexity
If a single evaporator supplies vapor to both adsorption devices, then the system structure is simplified, but the ability to supply vapor at different pressures is compromised
Solution Approach 1:
The invention introduces an intermediary mechanism within the evaporator that enables pressure differentiation. The evaporator acts as a mediator that converts a single heat input into differentiated pressure outputs, allowing the simplified single-evaporator structure to achieve the versatility of supplying vapor at different pressures to the two adsorption devices.
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 configuration enables more efficient cooling generation by increasing the adsorption capacity and reducing sensible heat loss, allowing for continuous and effective vapor adsorption and regeneration.
Implementation Method 1
The vapor supply member evaporates the adsorbate to generate cooling
Implementation Method 2
The adsorbate vapor is adsorbed in the first adsorption device and the second adsorption device
Implementation Method 3
the first adsorption device regenerates on heating to the regeneration temperature of the first adsorption device, or above
Data Source
AI summary
An adsorption heat pump system includes a first adsorption device that adsorbs an adsorbate, and that regenerates on heating to a regeneration temperature or above; a second adsorption device that adsorbs an adsorbate, and that regenerates on heating to a regeneration temperature or above; and a vapor supply member that evaporates the adsorbate and supplies adsorbate vapor to the first adsorption device and the second adsorption device at different respective pressures.