A rotary energy wheel<\/a> spins exhaust and supply airstreams through the same matrix, so a small amount of exhaust gas and moisture is inevitably carried into the supply. A purge sector<\/strong> is a slice of the wheel (typically 5-15 degrees) where a portion of the clean supply air is directed backwards through the matrix to flush out residual exhaust before that section re-enters the supply duct.<\/p>\n Purge lowers but does not eliminate carryover, and it costs a little recovered energy. For genuinely contaminated streams – labs, hospitals – isolation beats purge, so a separated plate or heat pipe<\/a> is preferred over a wheel.<\/p>\n Does purge waste energy?<\/strong> A small amount, but it protects supply air quality, which is usually worth more.<\/p>\n Is purge the same as bypass?<\/strong> No – bypass diverts flow around the wheel for free cooling; purge cleans the matrix in place.<\/p>\n Need help specifying the right air-to-air heat recovery for your project? Contact the QIYU engineering team<\/a> – WhatsApp +86 157 5335 5505, or email kuns913@gmail.com.<\/p>\n \u3088\u304f\u3042\u308b\u8cea\u554f<\/strong><\/p>\n A portion of the wheel, often 5 to 15 percent, is purged with supply air to sweep residual exhaust out of the matrix before it re-enters the supply stream, reducing carryover.<\/p>\n<\/div>\n It greatly reduces it but cannot eliminate it entirely; for truly separated streams, such as dirty or contaminated exhaust, a plate or run-around coil is safer.<\/p>\n<\/div>\nWhat it reduces<\/h2>\n
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Limits of purge<\/h2>\n
Frequently asked questions<\/h2>\n
What is the purge sector on a rotary wheel?<\/h3>\n
Does purge eliminate cross-contamination?<\/h3>\n