Frost formation in rotary heat recovery (also called a rotary heat exchanger) usually occurs on the fresh-air side, especially under the following conditions:<\/p>\n
\u2744\ufe0f Reasons frost forms on the fresh-air side:
\nUnder winter operating conditions:
\nWhen the outdoor temperature is very low (usually below 0\u00b0C) while the indoor exhaust-air temperature is relatively high (around 20\u00b0C), the wheel continuously rotates between the exhaust and fresh-air sides, transferring heat from the exhaust side to the fresh-air side.<\/p>\n
During the heat-exchange process:
\nThe wheel carries heat away from the exhaust side and releases it to the fresh air when it rotates to the fresh-air side. However, because the outdoor fresh air is too cold, the water vapor in the air condenses upon contacting the wheel and forms frost on the fresh-air side.<\/p>\n
\ud83c\udf2c\ufe0f Why doesn't frost form on the exhaust side?
\nThe air on the exhaust side comes from indoors and is relatively warm and humid.<\/p>\n
The exhaust side mainly \"loads\" heat onto the wheel and is unlikely to cool down to the frosting point.<\/p>\n
In contrast, the fresh-air side is the \"receiving end\" of heat; the temperature difference can lower the wheel surface temperature below 0\u00b0C, causing frost to form.<\/p>\n
\u2705 Engineering countermeasures
\nInstall a bypass or preheating device: to avoid frosting.<\/p>\n
Add defrost control logic: such as timed reverse rotation or wheel stoppage.<\/p>\n
Use a heater to preheat the fresh air: to avoid excessively low fresh-air temperature.<\/p>","protected":false},"excerpt":{"rendered":"
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