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In normal physical phenomena, it is considered difficult to directly create cold water from heat. Heat is a form of energy in an object, and since energy is conserved, it is necessary to convert the heat into another form of energy in order to cool it down. Because heat naturally flows from high temperature to low temperature, it is possible to cool an object by removing heat. For example, it becomes possible to create cold water by extracting heat from a heat source through water and transferring it to another object to lower its temperature.

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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Contact combustion-type sensors are widely used for the detection of combustible gases such as methane and propane. They are also commonly used as gas leak detectors in industrial and household settings, playing a crucial role in safety measures.

Our company is working on a new technology that utilizes microheaters based on semiconductor technology, moving away from the traditional platinum coils used in contact combustion gas sensors. Microheaters can achieve instantaneous temperature increases and high sensitivity detection due to their high reactivity, while also being energy-efficient due to low power consumption. Traditional gas sensors required a large power consumption and had to be configured for AC power supply. Gas sensors utilizing microheaters can operate for long periods on battery power.