Specifically, I will explain the process of making cold water from heat.
First, a low-temperature, low-pressure gas-liquid mixed refrigerant (water and water vapor) enters the evaporator. Inside the evaporator, which is in a near-vacuum state, the boiling point of water at 100°C is reduced to 7-10°C, allowing the refrigerant (water) to boil and turn into water vapor by absorbing heat from relatively warm water in the chilled water piping. The water vapor is drawn into the absorber, similar to the suction side of a vapor compression refrigeration cycle compressor. The water vapor is absorbed by the absorbent "lithium bromide" and is pumped into the regenerator. In the regenerator, the mixture of refrigerant and absorbent is heated to separate it back into the original water vapor and absorbent, with the absorbent returning to the absorber and the water vapor being sent to the condenser. There are methods for adding heat in the regenerator, including combustion using fuels such as gas or oil, or using steam or hot water. The refrigerant, which has returned to water after losing heat in the condenser, is depressurized in the expansion device and flows back to the evaporator, repeating the cycle.
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● Water is evaporated to create cold water. In a container (evaporator) with pressure close to a vacuum, when water is circulated through a heat transfer pipe that passes through the evaporating liquid, the heat from the flowing water is absorbed due to the latent heat of vaporization, resulting in a lower temperature state (cold water) than the water that entered the pipe. When water is dripped onto the pipe in a vacuum, the water on the surface absorbs heat from the water inside the pipe and evaporates, thus producing cold water.
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● The evaporated water vapor is collected. The water vapor (refrigerant) that evaporates in the evaporator is absorbed by the absorbent liquid in the absorber. The absorbent liquid (lithium bromide solution), which easily absorbs water vapor, absorbs the incoming water vapor (refrigerant), causing the concentration of the absorbent liquid to become diluted.
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● We create water vapor and a concentrated solution. The absorber absorbs the water vapor and sends the diluted absorbent solution to the regenerator. Using the principle of cooking in a pot, by heating the diluted solution, we evaporate the moisture (refrigerant) and return it to a highly concentrated lithium bromide solution (an absorbent solution that easily absorbs water vapor).
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●Steam is cooled to create water. The water vapor (refrigerant) evaporated in the regenerator is sent to the condenser. When the water vapor (refrigerant) comes into contact with the pipes carrying cooling water, it condenses back into water (liquefaction). The resulting water (refrigerant) is sent back to the initial evaporator.
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From the development and manufacturing to the sales of living environment equipment, we quickly respond to customer needs. Yazaki Energy System focuses on power cables, general cables, communication cables, gas equipment represented by gas meters, environmental system equipment such as air conditioning and solar thermal systems, and instrumentation equipment like taxi meters. We conduct the development, manufacturing, and sales of living environment equipment within the Yazaki Group in a consistent manner, providing products and services tailored to customer needs. As the energy society evolves, we see this as an opportunity to offer products and services that optimally utilize diverse energy sources, aiming to contribute to our customers and society as a 'comprehensive producer of all energy.' Moving forward, we will continue to challenge ourselves to deliver joy and inspiration to everyone, based on our commitment to being a company that exists with the world and is needed by society.
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