Semi-open high-temperature heat pump system and working method thereof
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Solution Overview
Problem
Current heat pump systems face challenges with ozone layer depletion, limited high-temperature capabilities, and inefficiencies when using chlorofluorocarbons, and water as a circulating fluid presents issues like freezing and high thermal resistance in closed systems.
Innovation Solution
A semi-open high-temperature heat pump system utilizing water as the circulating fluid, incorporating a direct-contact condenser for improved heat exchange efficiency, and a working method that includes system evacuation, startup, normal operation, shutdown, and freeze prevention phases to manage thermal energy recovery and prevent freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If chlorofluorocarbon is used as circulating working fluid, then the heat pump system can operate, but it causes environmental problems such as ozone layer depletion and greenhouse effect
Solution Approach 1:
The patent changes the working fluid from chlorofluorocarbon to water, fundamentally altering the chemical composition parameter to eliminate environmental harm while maintaining heat pump functionality. Water serves as an eco-friendly alternative that does not deplete the ozone layer or contribute to greenhouse effects.
2Temperature
If chlorofluorocarbon is used as circulating working fluid, then the system can operate, but the critical temperature limits the heating temperature to below 90°C
Solution Approach 1:
The patent exploits the superior thermal properties of water, which has a critical temperature of 374.3°C compared to the low critical temperature of chlorofluorocarbon. This parameter change enables the heat pump to achieve heating temperatures well above 90°C, breaking the temperature limitation of conventional systems.
3Object-affected harmful factors
If water is used as circulating working fluid in closed circulation, then environmental friendliness is improved, but thermal resistance increases and circulation efficiency decreases
Solution Approach 1:
The patent extracts water from the closed circulation system and uses it in an open circulation configuration. By taking out water from the closed loop and allowing direct contact with the condenser, the system eliminates thermal resistance barriers while maintaining environmental benefits, thereby improving circulation efficiency.
4Object-affected harmful factors
If water is used as circulating working fluid, then environmental friendliness is improved, but freezing occurs under non-operating condition in winter
Solution Approach 1:
The patent introduces an intermediary heating device to prevent water freezing during non-operating conditions in winter. This mediator provides auxiliary heating to maintain water temperature above freezing point, ensuring system reliability while preserving the environmental benefits of using water as working fluid.
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 enhances waste heat recovery, reduces thermal resistance, and maintains efficient operation by using water as a circulating fluid, achieving higher output temperatures and preventing freezing, thus aligning with environmental and energy conservation goals.
Implementation Method 1
a compressor 1, a direct-contact condenser 2, a heat exchanger 3, an evaporator 4
Implementation Method 2
a direct-contact condenser 2... an outlet a of the compressor 1 is sequentially connected to a first valve 17 and an inlet b of the steam pipe 2d of the direct-contact condenser 2
Implementation Method 3
a steam outlet i on the top of the evaporator 4 is connected to a sixth valve 22 and then to an inlet j of the compressor 1 via a pipe
Implementation Method 4
a heat exchanger 3... an outlet d at the bottom of the direct-contact condenser 2 is connected to a third valve 19 and then to an inlet e of the heat exchanger 3 via a pipe
Data Source
AI summary
A semi-open high-temperature heat pump system including a compressor, a direct-contact condenser, a heat exchanger, an evaporator, a water purifier, a cold water pump, a hot water pump, a circulating water pump, and a vacuum pump. A discharge port of the compressor is connected to the direct-contact condenser, the direct-contact condenser is connected to the evaporator via the heat exchanger, and the evaporator is connected to a gas suction port of the compressor via a gas vent on its top. An outlet of the water purifier is separately connected to the compressor, the direct-contact condenser, and the evaporator via the cold water pump. An outlet at the bottom of the evaporator is connected to the direct-contact condenser via the circulating water pump. The vacuum pump is connected above the direct-contact condenser, and the hot water pump is connected below the direct-contact condenser.