Dehumidifier for Cold Storage Rooms

Cold storage rooms such as meat storage, pharmaceutical storage, food storage, storage of fruits and vegetables etc. need to maintain certain humidity levels. The challenge in such environments is that condensation dehumidifiers freeze up, requiring us to do a manual de-icing of them to make them work. Condensation Walk in freezer dehumidifier TTR400Ddehumidifiers work in the principle of condensing the atmospheric moisture content. However, this will not work when the temperature of the room and the intake air is lower than approximately 10°C.

It is possible to do de-icing of dehumidifiers so that it can work at low temperatures. However, it is laborious to do this de-icing of the dehumidifiers. There are dehumidifiers having auto anti-icing systems that shut the compressor off if ice is detected, and thereby stopping the dehumidification process itself. And many models are also having a heating facility so that it can work continuously. It turns out to be a higher investment without the value of having a dehumidifier in colder climates or extremely cold rooms.

Dehumidifier Capacity Calculation

Desiccant dehumidifier for cold rooms

One way to overcome this challenge is to invest in a dehumidifier that works by absorption and not mechanically requiring it to heat the condenser coil. The absorption dehumidifiers which are known asCold storage dehumidifier TTR500D desiccant dehumidifiers are better options in colder climates but may turn to be a bit expensive than the mechanical ones.

Desiccant dehumidifiers take the intake air and pass through a rotary disc consisting of an adsorbent like silica gel. For this reason, it is also known as a rotary dehumidifier. The intake air is processed and converted into two streams of air viz. wet air and dry air. The dry air is recirculated within the same area and the wet air is to be thrown out of the room. Thus the moisture is removed out of the room through the wet air. The silica gel works for 2-3 years after which it needs to be replaced.
By principle in the condensation types, there is only one intake and one outlet air flow. The outlet air flow is dry air since the moisture content has been converted into water. But in desiccant type, there is one intake and two outlet air flow.

Why we can’t use normal condensation dehumidifiers for cold rooms, freezers & walk-in chillers?

Cold room dehumidifier TTR200By principle, condensation is cooling down the air and during this process, the moisture content of the air is converted into water. However in a cold environment, whether it is inside a cold room, chiller or in extreme winter conditions, the air is already cold and it is not possible to further cool down the air to convert the moisture content into the water. Hence the economically viable option is to use desiccant dehumidifiers in such areas.

Special condensation/refrigerant dehumidifiers for cold storages and walk-in-chillers

We supply special types of condensation type dehumidifiers manufactured by Calorex, UK. These models are PD-300 and PD-600 having special defrost features so that they can work in cold storages as well. If ice forms on the coils, the defrosting circuit gets actives and melts the same. Hence we can use these in cold storages above zero Deg C. However we cannot use these units below zero Deg C.

Condensation dehumidifier for cold storage; model Calorex PD300-PD600

These are under the brand name Porta-dry dehumidifiers by Calorex. These are portable heavy duty machines. They are suitable for building drying, construction sites, cold storages and water damage restoration.

Specifications of Model PD-300 Cold storage dehumidifier

Calorex-cold-storage-dehumidifierThe technical details of the model PD-300 are as below:

  1. It has a maximum dehumidification capacity of 53 Liter per day.
  2. The dehumidification capacity at 20°C ambient temperature and 70%RH is 31 Liter per day.
  3. The dehumidification capacity at 20°C ambient temperature and 80%RH is 46 Liter per day.
  4. It has an airflow of 380 Cubic Meter per hour.
  5. It has two models in terms of power supply. The model AX takes power supply of 230V, 50Hz Single Phase. ALX models are dual voltage options at 230V & 110 V, 50 Hz, Single Phase.
  6. The dimension of this model of cold storage dehumidifier is 82 cm x 51 cm x 48 cm.
  7. The weight of the unit is 45 kg.

Specifications of Model PD-600 Cold storage dehumidifier

The technical details of the model PD-600 are as below:

  1. It has a maximum dehumidification capacity of 100 Liter per day.
  2. The dehumidification capacity at 20°C ambient temperature and 70%RH is 46Calorex-walk-in-chiller-dehumidifier-UAE-Saudi-Oman-Qatar-Bahrain-Kuwait-Nigeria-Kenya-Tanzania Liter per day.
  3. The dehumidification capacity at 20°C ambient temperature and 80%RH is 70 Liter per day.
  4. It has an airflow of 750 Cubic Meter per hour.
  5. It has two models in terms of power supply. The model AX takes power supply of 230V, 50Hz Single Phase. ALX models are dual voltage options at 230V & 110 V, 50 Hz, Single Phase.
  6. The dimension of this model of cold storage dehumidifier is 102 cm x 63 cm x 58.5 cm.
  7. The weight of the unit is 65 kg.

You can read the pdf file of Comparison Sheet of Desiccant Dehumidifiers for the detailed comparison of dehumidifiers type.