Heat Pump Evaporation Under Vacuum for Low-Temperature Distillation
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Solution Overview
Problem
The high energy requirements for steam production and distillation processes, particularly due to the need for high temperatures to evaporate water at atmospheric pressure, limit the efficiency of traditional methods, and existing heat pumps struggle to achieve sufficient temperatures for water evaporation at standard pressures.
Innovation Solution
The method employs a heat pump to evaporate liquids at low pressure, utilizing low-temperature heat from its condenser, which reduces the evaporation temperature, allowing for energy-efficient steam production by compressing the refrigerant to higher pressures post-evaporation, thereby leveraging natural energy reservoirs for the energy-intensive phase transition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If water is evaporated at atmospheric pressure using traditional heating methods, then steam production is achieved, but energy consumption is excessively high
Solution Approach 1:
The patent changes the pressure parameter of the evaporation process from atmospheric pressure to reduced pressure (vacuum conditions). This parameter change causes the evaporation temperature to decrease significantly, allowing heat pumps with limited temperature lift capability to achieve evaporation that would otherwise require much higher temperatures and excessive energy input
Solution Approach 2:
The patent utilizes the phase transition properties of water under different pressure conditions. By operating in a vacuum environment, the phase transition from liquid to vapor occurs at lower temperatures, enabling the heat pump to transfer heat efficiently without requiring high-temperature heat sources that would consume excessive energy
2Use of energy by moving object
If heat pumps are used to evaporate water at atmospheric pressure, then energy from natural reservoirs can be utilized, but the condensation temperature is insufficient for water evaporation
Solution Approach 1:
The patent changes the pressure parameter of the evaporation chamber to reduced pressure, which directly lowers the required evaporation temperature. This enables heat pumps that can only achieve condensation temperatures of 80-100°C to effectively evaporate water, as the reduced pressure causes water to evaporate at temperatures well below 100°C
Solution Approach 2:
The patent introduces a vacuum environment as an intermediary condition between the heat pump condenser and the water to be evaporated. This vacuum mediator allows heat transfer to occur at lower temperature differentials, enabling the heat pump to utilize low-temperature heat sources from natural reservoirs effectively
3Productivity
If traditional boilers are used for steam production, then steam can be produced at atmospheric pressure, but the process consumes large amounts of energy
Solution Approach 1:
The patent fundamentally changes the operating pressure parameter from atmospheric to reduced pressure, which transforms the thermodynamic conditions of steam production. This parameter change enables the use of heat pumps instead of traditional high-energy boilers, dramatically improving production efficiency while reducing energy consumption
Solution Approach 2:
The patent replaces the traditional mechanical/thermal system of high-temperature boilers with a heat pump-based system operating under vacuum conditions. This substitution uses refrigeration cycle mechanics to achieve evaporation at lower temperatures, replacing the energy-intensive boiler process with a more efficient heat transfer system
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 significantly reduces energy consumption by utilizing natural energy sources for the most energy-intensive part of steam production, enabling efficient evaporation and distillation processes, including the production of steam and separation of liquids in various industrial applications.
Implementation Method 1
The invention is to use the low temperature heat produced by the heat pump's condenser to evaporate liquids under low pressure, and thereby at a lower evaporation temperature than at atmospheric pressure
Implementation Method 2
the heat pump's condenser. This is the heat pump's high pressure side of a heat exchanger where the refrigerant is cooled off and recondensed by the water or liquids that are to be evaporated
Implementation Method 3
2) The heat pump's evaporator. This is the heat pumps low pressure side where the refrigerant is heated and evaporated by the heat reservoir
Implementation Method 4
where the refrigerant is heated and evaporated by the heat reservoir
Implementation Method 5
3) The heat pump's compressor. Here the refrigerant is compressed to a higher pressure and temperature
Implementation Method 6
where the refrigerant is cooled off and recondensed by the water or liquids that are to be evaporated
Data Source
AI summary
A method for evaporation and possibly distillation of liquids by means of a heat pump is provided. By using a heat pump (2), energy is taken from energy reservoir(s) (1) such as rivers, sea water, air, or ground heat. However, it is difficult to obtain temperatures high enough to evaporate water at atmospheric conditions. According to the invention, low temperature heat is utilized by means of a heat pump by using the condenser of the heat pump to evaporate liquids in an evaporator (4′) at a pressure lower than atmospheric pressure, and thus at a lower evaporation temperature. Furthermore, the saturation of the evaporated liquids is eliminated before the evaporated liquids enter the compressor (10) by the further heating of the evaporated liquids leaving the liquids evaporator (4′) in a heat exchanger (11) that utilizes the peak temperature of the refrigerant that leaves the heat pump's refrigerant compressor (3).