Heat Pump Ventilation Control for Demand-Driven Evaporator Airflow
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Solution Overview
Problem
Existing air-conditioning devices with air/water heat pumps are inefficient due to the need for constant flow and additional heating systems, leading to increased power consumption and energy wastage, as they rely on maximum fan operation and fixed duct openings, which do not adapt to varying ventilation demands.
Innovation Solution
An air-conditioning device with a supply-regulating valve, extract-regulating valve, and control means to adjust fan speed based on extract air flow, allowing demand-driven ventilation and optimizing air/water heat pump operation by regulating flow through the evaporator, using sensors for air parameter measurement and communication between ventilation and heat pump systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fan operates at maximum speed to ensure desired flow over the evaporator, then the heat pump can maintain optimal operation, but power consumption increases greatly
Solution Approach 1:
The fan speed is made dynamically adjustable rather than fixed at maximum. The control unit varies the fan speed based on actual airflow conditions and heat pump requirements, allowing the system to maintain optimal heat pump operation while minimizing power consumption when full fan capacity is not needed.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit monitors airflow conditions and heat pump performance, then adjusts fan speed accordingly. This closed-loop control ensures the fan operates at the minimum necessary speed to maintain optimal heat pump function, preventing excessive power consumption.
2Reliability
If the passage opening in the supply duct is fixed to supplement discharge flow, then the desired flow over the evaporator can be achieved, but the system cannot adapt to varying ventilation demands
Solution Approach 1:
The passage opening in the supply duct is made adjustable rather than fixed. The control unit can modify the opening size dynamically to match varying ventilation demands while ensuring sufficient flow over the evaporator for heat pump operation.
Solution Approach 2:
The system changes the physical parameter of the passage opening size based on operational requirements. By adjusting this parameter, the system adapts to different ventilation demands while maintaining the necessary flow conditions for optimal heat pump performance.
3Reliability
If the discharge flow is increased to ensure heat pump operation, then sufficient air flows over the evaporator, but more heat than required is extracted from spaces
Solution Approach 1:
The control unit monitors the actual flow conditions and heat extraction levels, adjusting the fan speed and passage opening to achieve optimal heat pump operation while minimizing excessive heat extraction from building spaces.
Solution Approach 2:
The system adjusts operational parameters (fan speed, passage opening) to find the optimal balance between maintaining sufficient flow for heat pump operation and minimizing excessive heat extraction from occupied spaces.
4Adaptability or versatility
If a non-modulating heat pump with limited capacity is used, then the system can operate with available extract air flow, but additional heating systems are required
Solution Approach 1:
The control system dynamically adjusts fan speed and airflow parameters to optimize the operation of the limited-capacity heat pump, maximizing its effectiveness with the available extract air flow.
Solution Approach 2:
By changing operational parameters such as fan speed and passage opening, the system optimizes the performance of the non-modulating heat pump to achieve better heating efficiency with the available airflow, reducing the need for additional heating systems.
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 consumption by ensuring only necessary airflow, maintaining optimal heat pump operation, and providing additional heating when needed, thereby enhancing energy efficiency and reducing the need for backup heating systems.
Implementation Method 1
an air/water heat pump for heating water, comprising an evaporator... one single fan for sucking in extract air through the extract duct, for forcing sucked-in extract air over the evaporator
Implementation Method 2
an air/water heat pump for heating water, comprising an evaporator
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a highly energy efficient air-conditioning device (1), comprising an air/water heat pump (3), at least one extract duct (6) for discharging extract air from a building, comprising a regulator valve (33), a supply duct (9) for supplying outside air to the building, comprising a regulator valve (32), a fan (28) for forcing extract air and/or outside air over the evaporator (14) of the air/water heat pump (3), an additional heating device (12) and control means for controlling the regulator valve (32) for the supply air and the fan (28) on the basis of the flow of extract air. The present invention also relates to a method for controlling such an air-conditioning device (1).