Factory Humidity Control Within a 50–70% RH Operating Range
Factory Humidity Control Within a 50–70% RH Operating Range
Factory Humidity Control: Why Cooling Capacity Is Not Dehumidification Capacity
A production workshop can be cool enough for its process and still have an unsuitable humidity level. The reason is that temperature control and moisture removal are related but different tasks. Cooling capacity describes how much heat a unit can remove; dehumidification capacity describes how much water it can remove from the air. One cannot be reliably inferred from the other.
This distinction matters when evaluating temperature-and-humidity control equipment for manufacturing facilities. The room’s process moisture load, outdoor-air intake, airflow pattern, and operating conditions all affect the result. Equipment specifications should therefore be matched to the required environmental conditions, not just to floor area or a cooling-capacity figure.
Relative humidity (RH) is the ratio of the water vapor in the air to the amount the air could hold at saturation at the same temperature. Because warmer air can hold more water vapor before reaching saturation, RH changes when temperature changes—even if the air’s moisture content stays nearly constant.
That means an RH reading alone does not show how much water is actually in the air. For engineering analysis, it can be useful to distinguish RH from humidity ratio, which expresses the mass of water vapor per mass of dry air, and from dew point, the temperature at which the air becomes saturated and condensation can begin.
In a factory, these measures help explain different problems. A change in RH may result from a temperature change, while a rising humidity ratio indicates that moisture has entered or been added to the air. If a surface is colder than the surrounding air’s dew point, condensation may occur even when the room’s average RH seems acceptable.
In a refrigerant-based dehumidification process, air is cooled across a coil. When the coil surface is below the air’s dew point, some water vapor condenses and drains away. The coil removes both sensible heat, which changes air temperature, and latent heat associated with moisture removal.
If the air is cooled more than the process or occupants can tolerate, a system may use heating or another temperature-control step to bring the supply air back toward its target. The precise sequence depends on the equipment and control design. Not every industrial air-conditioning or dehumidification system uses the same refrigeration arrangement, and desiccant systems remove moisture by a different mechanism.
A unit with heating, cooling, humidification, and dehumidification functions can adjust temperature and humidity in response to measured conditions and setpoints. Those functions do not, by themselves, establish the unit’s moisture-removal rate under a particular factory operating condition. That performance must be confirmed from the relevant model data.
For the product series described here, the stated temperature setpoint range is 16–30°C, with a listed temperature-control deviation of ±0.2°C. The stated humidity setpoint range is 50%–70% RH, with a listed humidity-control deviation of ±2%.
ParameterListed valueWhat it describesTemperature control range16–30°CAvailable temperature setpointsTemperature control deviation±0.2°CStated control accuracyHumidity control range50%–70% RHAvailable RH setpointsHumidity control deviation±2% RHStated humidity-control accuracyThese figures describe the product’s stated control range and accuracy; they are not a guarantee that every point in a production area will remain within those deviations under all loads. Actual conditions depend on the room, sensor locations, air distribution, operating load, and other site factors. A setpoint range is also not a universal recommendation: different processes may require different environmental targets.
The listed control system uses a PLC, PID adjustment, fault diagnosis, energy control, and operating modes. PID control responds to the difference between a setpoint and a measured value, adjusting operation to move the measured condition toward the target. Control performance still depends on suitable sensing and on the system having enough capacity for the actual load.
The listed models range from 5 kW to 175 kW of cooling capacity. The series data does not provide a corresponding dehumidification capacity. Therefore, the cooling figures cannot be converted into kilograms of water removed per hour or day, nor do they establish whether a unit can meet a factory’s moisture-control requirement.
ModelCooling capacityZHHF-5G5 kWZHHF-9G9 kWZHHF-12G12 kWZHHF-15G15 kWZHHF-20G20 kWZHHF-25G25 kWZHHF-30G30 kWZHHF-36G36 kWZHHF-45G45 kWZHHF-54G54 kWZHHF-60G60 kWZHHF-70G70 kWZHHF-85G85 kWZHHF-105G105 kWZHHF-140G140 kWZHHF-175G175 kWCooling and dehumidification performance are related because coil temperature and airflow affect condensation, but the relationship depends on operating conditions. A cooling-capacity rating alone does not provide the information needed to determine moisture removal. Where humidity control is a critical process requirement, obtain model-specific dehumidification data for the relevant conditions.
A factory’s moisture load may come from process materials, washing or other moisture-generating operations, outdoor air, and air entering through doors or building leakage. Heat from production equipment creates a separate thermal load. Both influence system operation, but they are not interchangeable sizing quantities.
Air distribution matters as well. In a large or tall workshop, supply and return paths, equipment placement, partitions, and local sources of heat or moisture can produce uneven conditions. A sensor may show that the room average is near its target while a production zone remains humid or a cold surface approaches the dew point. Adding more dehumidification equipment will not necessarily resolve a poorly distributed airflow pattern.
For this reason, equipment selection should consider the process target, room geometry, moisture and heat sources, outdoor-air requirements, and the intended supply-air arrangement. Floor area alone does not reveal the required cooling capacity, airflow, or moisture-removal rate.
The product series is offered in vertical, ceiling-mounted, and horizontal configurations, with listed cooling capacities from 5 kW to 175 kW across the range. These forms address different installation layouts; the appropriate choice depends on available space and site conditions, not on an assumed difference in moisture-removal performance.
Product information describes the vertical unit as having a simple structure and convenient maintenance. The horizontal unit’s listed features include fault indication and protections for overload, water shortage, water leakage, and low pressure. Protection features vary by configuration and model, so the applicable product documentation should be checked.
The series is described as having a cold-bridge-resistant design and a frame structure intended to support maintenance access. Its stated evaporator construction uses internally threaded copper tubes and hydrophilic louvered aluminum fins, with a claimed 30% increase in heat-transfer coefficient compared with a conventional evaporator. That figure refers to the evaporator’s stated heat-transfer performance; it should not be interpreted as a 30% reduction in whole-unit energy use or a 30% increase in dehumidification capacity.
The listed control functions include PLC-based operation, PID adjustment, fault diagnosis, and energy control. The product information also identifies protective devices for conditions such as high and low pressure, discharge temperature, and fan or compressor overload. The exact protection set depends on the unit configuration.
For ongoing factory operation, control functions are only part of the system. Temperature and humidity sensors must represent the areas that matter to the process; airflow paths must reach those areas; and condensate drainage and heat-transfer surfaces must remain in suitable operating condition. Product specifications should be reviewed alongside installation and maintenance requirements for the selected model.
For manufacturing facility HVAC, begin with the environmental target and the loads that the system must handle. Confirm the room’s temperature and humidity requirements, process moisture sources, heat gains, outdoor-air conditions, and air-distribution constraints. Then compare those requirements with model-specific cooling, airflow, and dehumidification data.
The listed 16–30°C and 50%–70% RH control ranges, ±0.2°C and ±2% RH deviations, and 5–175 kW cooling-capacity range describe product-series specifications. They do not establish performance in every factory or provide an unlisted moisture-removal rate. Where factory dehumidification is the primary objective, verify dehumidification capacity under relevant operating conditions before selecting a unit.
← 返回资讯HomeA production workshop can be cool enough for its process and still have an unsuitable humidity level. The reason is that temperature control and moisture removal are related but different tasks. Cooling capacity describes how much heat a unit can remove; dehumidification capacity describes how much water it can remove from the air. One cannot be reliably inferred from the other.
This distinction matters when evaluating temperature-and-humidity control equipment for manufacturing facilities. The room’s process moisture load, outdoor-air intake, airflow pattern, and operating conditions all affect the result. Equipment specifications should therefore be matched to the required environmental conditions, not just to floor area or a cooling-capacity figure.
Why Temperature and Relative Humidity Must Be Considered Together
Relative humidity (RH) is the ratio of the water vapor in the air to the amount the air could hold at saturation at the same temperature. Because warmer air can hold more water vapor before reaching saturation, RH changes when temperature changes—even if the air’s moisture content stays nearly constant.
That means an RH reading alone does not show how much water is actually in the air. For engineering analysis, it can be useful to distinguish RH from humidity ratio, which expresses the mass of water vapor per mass of dry air, and from dew point, the temperature at which the air becomes saturated and condensation can begin.
In a factory, these measures help explain different problems. A change in RH may result from a temperature change, while a rising humidity ratio indicates that moisture has entered or been added to the air. If a surface is colder than the surrounding air’s dew point, condensation may occur even when the room’s average RH seems acceptable.
How Cooling Can Remove Moisture—and Why It May Not Be Enough
In a refrigerant-based dehumidification process, air is cooled across a coil. When the coil surface is below the air’s dew point, some water vapor condenses and drains away. The coil removes both sensible heat, which changes air temperature, and latent heat associated with moisture removal.
If the air is cooled more than the process or occupants can tolerate, a system may use heating or another temperature-control step to bring the supply air back toward its target. The precise sequence depends on the equipment and control design. Not every industrial air-conditioning or dehumidification system uses the same refrigeration arrangement, and desiccant systems remove moisture by a different mechanism.
A unit with heating, cooling, humidification, and dehumidification functions can adjust temperature and humidity in response to measured conditions and setpoints. Those functions do not, by themselves, establish the unit’s moisture-removal rate under a particular factory operating condition. That performance must be confirmed from the relevant model data.
What the Listed Control Ranges Do—and Do Not—Tell You
For the product series described here, the stated temperature setpoint range is 16–30°C, with a listed temperature-control deviation of ±0.2°C. The stated humidity setpoint range is 50%–70% RH, with a listed humidity-control deviation of ±2%.
ParameterListed valueWhat it describesTemperature control range16–30°CAvailable temperature setpointsTemperature control deviation±0.2°CStated control accuracyHumidity control range50%–70% RHAvailable RH setpointsHumidity control deviation±2% RHStated humidity-control accuracyThese figures describe the product’s stated control range and accuracy; they are not a guarantee that every point in a production area will remain within those deviations under all loads. Actual conditions depend on the room, sensor locations, air distribution, operating load, and other site factors. A setpoint range is also not a universal recommendation: different processes may require different environmental targets.
The listed control system uses a PLC, PID adjustment, fault diagnosis, energy control, and operating modes. PID control responds to the difference between a setpoint and a measured value, adjusting operation to move the measured condition toward the target. Control performance still depends on suitable sensing and on the system having enough capacity for the actual load.
Cooling Capacity Is Not a Moisture-Removal Rating
The listed models range from 5 kW to 175 kW of cooling capacity. The series data does not provide a corresponding dehumidification capacity. Therefore, the cooling figures cannot be converted into kilograms of water removed per hour or day, nor do they establish whether a unit can meet a factory’s moisture-control requirement.
ModelCooling capacityZHHF-5G5 kWZHHF-9G9 kWZHHF-12G12 kWZHHF-15G15 kWZHHF-20G20 kWZHHF-25G25 kWZHHF-30G30 kWZHHF-36G36 kWZHHF-45G45 kWZHHF-54G54 kWZHHF-60G60 kWZHHF-70G70 kWZHHF-85G85 kWZHHF-105G105 kWZHHF-140G140 kWZHHF-175G175 kWCooling and dehumidification performance are related because coil temperature and airflow affect condensation, but the relationship depends on operating conditions. A cooling-capacity rating alone does not provide the information needed to determine moisture removal. Where humidity control is a critical process requirement, obtain model-specific dehumidification data for the relevant conditions.
Factory Conditions That Affect Humidity Control
A factory’s moisture load may come from process materials, washing or other moisture-generating operations, outdoor air, and air entering through doors or building leakage. Heat from production equipment creates a separate thermal load. Both influence system operation, but they are not interchangeable sizing quantities.
Air distribution matters as well. In a large or tall workshop, supply and return paths, equipment placement, partitions, and local sources of heat or moisture can produce uneven conditions. A sensor may show that the room average is near its target while a production zone remains humid or a cold surface approaches the dew point. Adding more dehumidification equipment will not necessarily resolve a poorly distributed airflow pattern.
For this reason, equipment selection should consider the process target, room geometry, moisture and heat sources, outdoor-air requirements, and the intended supply-air arrangement. Floor area alone does not reveal the required cooling capacity, airflow, or moisture-removal rate.
Choosing Among Vertical, Ceiling-Mounted, and Horizontal Units
The product series is offered in vertical, ceiling-mounted, and horizontal configurations, with listed cooling capacities from 5 kW to 175 kW across the range. These forms address different installation layouts; the appropriate choice depends on available space and site conditions, not on an assumed difference in moisture-removal performance.
Product information describes the vertical unit as having a simple structure and convenient maintenance. The horizontal unit’s listed features include fault indication and protections for overload, water shortage, water leakage, and low pressure. Protection features vary by configuration and model, so the applicable product documentation should be checked.
The series is described as having a cold-bridge-resistant design and a frame structure intended to support maintenance access. Its stated evaporator construction uses internally threaded copper tubes and hydrophilic louvered aluminum fins, with a claimed 30% increase in heat-transfer coefficient compared with a conventional evaporator. That figure refers to the evaporator’s stated heat-transfer performance; it should not be interpreted as a 30% reduction in whole-unit energy use or a 30% increase in dehumidification capacity.
Control, Protection, and Maintenance Considerations
The listed control functions include PLC-based operation, PID adjustment, fault diagnosis, and energy control. The product information also identifies protective devices for conditions such as high and low pressure, discharge temperature, and fan or compressor overload. The exact protection set depends on the unit configuration.
For ongoing factory operation, control functions are only part of the system. Temperature and humidity sensors must represent the areas that matter to the process; airflow paths must reach those areas; and condensate drainage and heat-transfer surfaces must remain in suitable operating condition. Product specifications should be reviewed alongside installation and maintenance requirements for the selected model.
A Practical Basis for Equipment Selection
For manufacturing facility HVAC, begin with the environmental target and the loads that the system must handle. Confirm the room’s temperature and humidity requirements, process moisture sources, heat gains, outdoor-air conditions, and air-distribution constraints. Then compare those requirements with model-specific cooling, airflow, and dehumidification data.
The listed 16–30°C and 50%–70% RH control ranges, ±0.2°C and ±2% RH deviations, and 5–175 kW cooling-capacity range describe product-series specifications. They do not establish performance in every factory or provide an unlisted moisture-removal rate. Where factory dehumidification is the primary objective, verify dehumidification capacity under relevant operating conditions before selecting a unit.