Low-Charge DX Ammonia Industrial Plant Design
TECHNICAL BULLETIN
Topic: Low-Charge DX Ammonia Industrial Plant Design
Date: REV B 26 Sep 2022
Author: Bruce I. Nelson, P.E., CEO BVN Engineering
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ABSTRACT
When designing an industrial refrigeration plant for low-charge (DX) ammonia, there are a number of critically important concepts to consider which differ significantly from traditional pumped ammonia plant design. These “big ideas” are described briefly below.
I. Capture and Removal of Water
II. Oil-less (< 1 ppm) Ammonia Liquid
III. Oil-less Hot Gas for Defrost
IV. Subcooled Ammonia Liquid
V. Evaporator Design
Mitigating Separated (Stratified/Wavy) Flow
Managing Non-Uniform Distribution
Managing Non-Uniform Circuit Loading
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