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DIRECT EXPANSION AMMONIA SYSTEMS

This company’s dedicated team of experts can create excellence to mitigate client company’s challenges. Here is a description of a futuristic safe system offered with innovative engineering…

March 15, 2024

Aqua Refrigeration is an entrepreneurial set up providing futuristic solutions for Ammonia Low Charge Direct Expansion Systems for Cold Storage, Food Processing, Blast Freezers, Industrial Chiller 3PL logistics and Refrigerated Warehouses with Strategic Technical Tie Up with Scantec Refrigeration Technologies Australia.

The company’s expert team brings an unrivalled dedication to exceeding your expectations, and commitment to ﬁnding new and better ways through innovative technology.

Key expertise areas are:

Low Charge Ammonia Systems
Ammonia Based Air Conditioning systems
Super-eﬃcient Plug and Play Ammonia Engine rooms
Retroﬁt of existing plant.

The low charge Ammonia System works in the same way as a dual stage Ammonia System with no pumps. Hence, there is a considerable reduction in the ammonia inventory to be stored in the vessels.

The ammonia in the rooms is less than 3% of what it would be in a conventional system, hence minimizing the risks in case of a refrigerant leakage.

The recorded energy performance improvements illustrated with the green markers in Figure 1 are mainly due to:

Elimination of all high-density liqueﬁed refrigerant in all suction lines and risers
Improved compressor part-load energy eﬃciency – because of rotational compressor speed control, compressor rotational speed ranges and compressor type used
Low friction 304SS piping with absolute roughness values 20-40 times lower than carbon steel
Variable frequency drives on everything
High-pressure ﬂoat valve controlled condensate return during hot gas defrost
Improved condenser liquid drainage using high-pressure ﬂoat valve
Improved evaporator utilization by avoiding excess overfeed rates and brining

Pressure drops in wet return lines and risers can be up to sixty times greater than the pressure drop in the same lines/risers when conveying saturated vapour only.

Dehumidiﬁcation by means of a desiccant drier discharging dehumidiﬁed air vertically down on the cold side of the doors of the Frozen Staging area is provided to remove moisture ingress by sublimation.

Penthouse evaporators are used above the ceiling eliminating any piping and condensate leaks in the rooms and easy access to service hence giving more space in the room for the racking.

For blast freezing applications In Rack Blast freezers are used. These are located within the freezer store. During blast freezing, air is drawn through pallets by means of dedicated blast freezing fans. The product to be frozen is stored within cold store racking dedicated to blast freezing. Air is directed through the product by means of ﬂexible polyurethane curtains that are drawn across the face(s) of the cold store racking system following product loading and prior to starting the blast freezer fans. The heat removed from the product during freezing is absorbed by the penthouse evaporators.

In special cases, if required, ambient air defrost is used to increase the overall eﬃciency of the plant.

Source: Aqua Refrigeration