Technical School: phase change material (PCM) thermal storage systems – cooling
HC HVAC & R Network Energy storage technology can be divided into significant energy storage technologies and potential energy storage technologies, phase change materials (PCM) thermal storage is a latent energy storage technology.
A substance capable of solid, liquid or gaseous exist, depending on storage temperature and pressure. Balanced three-phase can co-exist, but in fact will generally use the two-phase state. Changes in latent heat of certain substances can stand heat or cold storage.
For latent heat storage material known as "phase change material (PCM)", compared with sensible heat storage material, its advantages are: small size, phase transition temperature change, the loss of less spare time.
Most commonly used is the solid and liquid phase transition between the dissolution, while three-state phase transition between the various can be applied.
Ice storage system, because the freezing point of water temperature is 0 degrees, cooling system evaporation temperature must be minus 8 degrees below, so it is a power technology. In addition to water storage system Chiller Group of 7 degrees higher than the design of the water temperature, the same cooling capacity of the system will fall to 60%.
So it is also an energy technology. Ice storage Central air conditioning System needs refrigerant, the general use of ethylene glycol solution and the plate heat exchanger, which not only causes energy loss, and increased investment. As the ice storage system, ice, cold water storage tank and a lower temperature Jian Lu, so playing to increase insulation thickness. Such as the traditional central air conditioning to normal to the ice storage air conditioning, refrigeration conditions must be replaced for the duplex units, additional Fans , Water pump, air conditioning box, Jian Road and other major components have to replace or modify, so not conducive to traditional central air conditioning to such ordinary ice storage air conditioning system. Its high cost, so a one-time large investment, long payback period. Ice storage air conditioning system not only technology Dayin complex flower, design and control difficult and reduce system stability and increase the future operation of the equipment failure rate and increased equipment maintenance rate and so on. In order to overcome the shortcomings of ice storage system, EPS UK company has developed high-temperature (zero on the ice) eutectic salt phase change materials, such phase change materials was higher than the freezing point of zero up to +164 degrees, completely overcome the shortcomings of the ice storage system usually used in central air conditioning system Dayin +8 degrees phase change materials, heat in the mining Heating And hot water and industrial, commercial heating typically +58 degree phase change material, it also overcomes the general adoption of geothermal heating and water heating heat storage water system deficiencies. Another British company has developed a low EPS (minus the ice) eutectic salt phase change materials, such phase change materials can reach the freezing point of -114 degrees below zero, can be applied to frozen, chilled, frozen and other fields, such as cold storage, frozen storage, medical and other frozen. According to Pace (EPS) eutectic salt phase change materials application is very broad.
According to Pace (EPS) eutectic salt (positive temperature of the phase change material) thermal energy storage system is the use of two or more chemical substances formed by mixing non-toxic eutectic salt (phase change material), its freezing point or melting point higher than water. This eutectic salt phase change materials are packed in containers, and for large companies
Business, industry or other institutions of heating, air conditioning, refrigeration and other systems.
Second, according to Pace (EPS) eutectic salt phase change material thermal storage technology has the function of self-freezing, during the day and night Environment Temperature higher than 10-15 degrees Celsius, can provide their own frozen storage without having to run TES Ice machine The.
Furthermore, according to Pace (EPS) eutectic salt phase change material thermal storage technology can overcome the ice storage air conditioning system needs to run in temperatures below zero cycle defects. Can be combined with conventional water-cooled air conditioning systems used do not need additional cooling units and related facilities, such as ethylene glycol system
Systems, heat exchange plates, pipes?? So.
Finally, according to Pace (EPS) eutectic salt phase change material thermal storage technology can provide -114 degrees to +164 degrees Celsius, the melting / freezing point range, for thermal energy storage technology that opened up a challenging a new realm.
According to Pace (EPS) eutectic salt phase change material thermal storage technology solutions
After much research, EPS successfully to identify several types of PCM and the satisfaction of a mixture of polymers can be suitable for most air conditioning and refrigeration, heating, high / low temperature storage applications.
According to Pace (EPS) PCM eutectic composition is non-toxic salt, do not burn, does not produce gas and the inorganic. Most hydroxides are not caused by volume phase transition with the change, that is, Peng Zhang, or contraction, and phase change will not happen "separation layer" of the phenomenon of attenuation of the thermal store stock. At the same time,
According to Pace (EPS) eutectic salt, high reliability and stability and durability, but also economic and commercial value.
According to Pace (EPS) eutectic salt placed in the stainless steel balls and high density polyethylene sheet container, and through the life cycle of 15 to 20 years of testing. These
PCM reliable performance, there was no "floor phenomenon" and the container sizing phenomenon. And the stock does not decay heat store.
Other EPS-PCM model solution is also designed temperature range where they have similar coagulation and lysis curve.
To accelerate the solidification / dissolution test, simulation of a typical TES system, the daily storage and release mode, you can assess according to Pace (EPS) eutectic salt system life. A typical solidification / dissolution cycle can be seen in Figure 3.3.2
According to Pace (EPS) eutectic salt phase change material (PCM) family of products, application temperature from -114 degrees to +164 degrees Celsius, can be suitable for a large number of cooling and heating applications. Stored cold / heat energy to offset the day's peak electricity consumption.
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