Heat pump control
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Solution Overview
Problem
Existing heat pump systems with cycle reversing valves face inefficiencies due to inconsistent mode switching, leading to ineffective compressor operation when the reversing valve fails to switch correctly between heat and cool modes.
Innovation Solution
A control system that includes sensors for the condenser coil temperature and ambient temperature, along with a controller to determine the reversing valve's mode and deactivate the compressor when it is in an inconsistent mode, ensuring proper operation by comparing the temperature differences to maintain consistent heating or cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a reversing valve with solenoid coil actuation is used to control heat pump mode switching, then the heat pump can operate in both heat and cool modes, but when the actuation means fails the reversing valve may remain in an inconsistent mode leading to ineffective compressor operation
Solution Approach 1:
The control system continuously monitors the actual mode of the heat pump by comparing condenser coil temperature with ambient temperature and provides feedback to detect inconsistencies between the commanded mode and actual mode. When a mismatch is detected, the system alerts the user and prevents ineffective compressor operation.
Solution Approach 2:
The system uses readily available temperature data (condenser coil temperature and ambient temperature) that are already being collected for other control purposes to self-diagnose the reversing valve mode status, eliminating the need for additional complex sensing or user intervention.
2Device complexity
If traditional temperature sensing methods are used without comparing condenser coil temperature to ambient temperature, then the control system is simpler, but the system cannot detect reversing valve mode inconsistencies
Solution Approach 1:
The control system uses existing temperature sensors (condenser coil temperature sensor and ambient temperature sensor) that are already part of the heat pump control system for multiple purposes: both for normal temperature control operations and for detecting reversing valve mode inconsistencies, eliminating the need for dedicated detection hardware.
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 control system effectively prevents ineffective compressor operation by ensuring the reversing valve is in the correct mode, enhancing the reliability and efficiency of heat pump systems by detecting and addressing mode inconsistencies.
Implementation Method 1
a sensor that provides an output indicative of a sensed temperature of a condenser coil of the heat pump
Implementation Method 2
The controller is configured to compare the output of the sensor to a representation of sensed ambient temperature to determine whether the reversing valve is in heat mode where the sensed ambient temperature exceeds the sensed temperature of the condenser coil
Data Source
Figure 1
Figure 2
AI summary
A control is provided that includes a sensor that provides an output indicative of a sensed temperature of a condenser coil of the heat pump, and a controller for controlling activation of at least a compressor of the heat pump. The controller is configured to compare the output of the sensor to a representation of sensed ambient temperature to determine whether the reversing valve is in heat mode where the sensed ambient temperature exceeds the sensed temperature of the condenser coil, or in cool mode where the sensed ambient temperature is less than the sensed temperature of the condenser coil. The controller is further configured to deactivate at least the compressor of the heat pump when the reversing valve is determined to be in a mode that is inconsistent with the heat pump's heating operation or cooling operation.