What are the respective features of cold dryers and suction dryers?

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The last edit to this post was made by Ameba on 2016-1-21 at 15:25. Compared to desiccant dryers, cold dryers have the following advantages: 1. No consumption of compressed air – most users do not require a very low dew point for compressed air; therefore, using a cold dryer can result in energy savings compared to using a desiccant dryer； 2. No valve wear – Desiccant dryers have switching valves, and although refrigerated dryers also contain valves, there is basically no issue with wear ； 3. There is no need to regularly add or replace the adsorbent ； 4. Low operating noise ； The desiccant dryer produces noise due to pressure release in its adsorption tower; inside the air compressor room, the operating noise of the cold dryer is generally not audible ； 5. Daily maintenance is simple; simply clean the filter of the automatic drainer on time ； 6. The pre-treatment requirements for the air source are not high; a standard oil-water separator is sufficient to meet the air quality requirements of the refrigerated dryer. Compared to cold dryers, suction dryers have the following advantages: 1. Low pressure dew point and excellent drying performance. The lowest pressure dew point can reach -70℃ ； 2. It causes no pollution to the atmosphere; cold dryers use refrigerants (CFCs) for cooling, which can cause severe atmospheric pollution ； The desiccant dryer uses adsorbents, causing no pollution to the atmosphere. Since the \"pressure dew point\" that a cold dryer can achieve for compressed air treatment is only around 10°C, the degree of drying of the gas is far inferior to that of an adsorption dryer; in many applications, a cold dryer cannot meet the requirements regarding the dryness level of the gas supply specified by the process. A convention has emerged in the technical community: when a “pressure dew point” requirement is above zero, a cold dryer is the preferred choice ； When the “pressure dew point” requirement is below zero, a desiccant dryer is the only option.