EKS-HUM-035 / Dehumidification technology and performance

Regeneration Temperature

再生温度

Regeneration temperature is the stated temperature of the regeneration stream at a defined point, commonly the air entering a heat-regenerated desiccant sector.

Aliases: reactivation temperature, reactivation-air inlet temperature

QUANTITY, SYMBOL AND UNIT

Quantity / objectRegeneration-air inlet temperature

Symbolt_reg

SI°Cdegree Celsius

SIKkelvin

IP°Fdegree Fahrenheit

Definition

Regeneration temperature is the stated temperature of the regeneration stream at a defined point, commonly the air entering a heat-regenerated desiccant sector.

Raising this inlet temperature can dry the desiccant more completely and change process outlet moisture, but the effect also depends on desiccant, airflow, inlet humidity, velocity, rotor geometry and control limits.

Relations and distinctions

Air temperature and desiccant temperature

The entering regeneration-air temperature is not automatically equal to the desiccant matrix or heater-surface temperature.

Temperature and heat input

Temperature is a state value; regeneration heat input is an energy rate. Airflow and losses connect the two.

Engineering meaning

Attach every regeneration-temperature value to a measurement point and operating condition.
Use manufacturer performance data or verified tests for the selected desiccant and airflow rather than a generic target.

Common misconceptions

MisconceptionThere is one optimum regeneration temperature for every desiccant rotor.

Accurate explanationThe useful range depends on material, desired outlet state, airflow, energy source, seals and equipment limits.

Application boundaries

An unspecified temperature may refer to heater discharge, rotor inlet, exhaust or desiccant and is not comparable.
Increasing temperature alone does not prove higher net efficiency or acceptable component life.

Supporting sources

ASHRAE / SRC-ASHRAE-S20-CH24

ASHRAE Handbook - HVAC Systems and Equipment, Chapter 24: Desiccant Dehumidification and Pressure-Drying Equipment ↗

2020 IP edition / Chapter 24, rotary equipment performance and reactivation-air inlet temperature discussion
Supports: Reactivation-air inlet temperature affects desiccant drying and process outlet moisture; Temperature must be tied to the entering regeneration stream; Higher temperature is not a universal optimum because other variables and heat sources matter

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