Данное
решение отлично подходит для применения
природного хладагента в регионах с
высокими средними температурами;
подкритические каскадные системы CO2
чаще всего находят свое применение в
теплых климатических условиях или
выступают в роли первой стадии применения
CO2 в качестве хладагента.
Каскадные установки состоят из двух контуров: один с средней температурой (обычно это R134a, R404a или аммиак), а другой — с низкой температурой (R744). Эти контуры связаны с помощью одного или нескольких теплообменников, которые, с одной стороны, конденсируют CO2, а с другой, функционируют как обычные испарители для контура средней температуры.
Преимущества:
система напоминает традиционное оборудование (например, R404);
рабочее давление сопоставимо с привычными системами (не превышает 45 бар);
среднее содержание фреонов на основе ГФУ;
эффективность системы выше по сравнению со стандартными установками на основе ГФУ, что позволяет использовать ее в любых климатических условиях.
Недостатки:
если не используется аммиак, установка не является полностью экологически чистой;
использование аммиака может ограничить применение среднетемпературной компрессорной установки в некоторых странах.

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