A Complete Overview Of Marine Chillers

In recent times, the advancements in shipbuilding technology and the growth of offshore fishing have led to increased focus on marine water chillers. These marine chillers are essential for maintaining the freshness of caught fish, ensuring they remain in good condition until they are unloaded ashore or processed further on the ship.

The operational principle of marine chillers resembles that of their land-based counterparts. A compressor is used to transform low-temperature, low-pressure refrigerant gas into high-temperature, high-pressure gas. This is then sent to the condenser, where heat is dissipated via a cooling medium, typically seawater, causing the refrigerant gas to condense into a liquid. The liquid refrigerant, after passing through a throttling device to reduce its pressure, enters the evaporator. Here, it absorbs heat from the cooled medium, such as air or water, thereby achieving the refrigeration effect. The cooled medium is then piped to the equipment or system requiring cooling, completing the cooling cycle.

The key components of marine chillers include compressors, condensers, evaporators, throttling devices, and control systems. The compressor is the central part of a marine chiller, with common types being piston, reciprocating, screw (semi-closed or open), or scroll compressors. The condenser usually has a shell and tube structure, often made of nickel-copper on the inside, and uses seawater as the cooling medium. To safeguard against seawater corrosion, corrosion-resistant materials like titanium alloy or stainless steel are employed. The evaporator typically has a shell and tube or plate structure and can be made of stainless steel based on customer requirements. Its design must consider the spatial constraints and cooling needs of the ship, aiming for efficient heat exchange, compact size, and light weight.

Hengde, as a specialized manufacturer of marine chillers, has assisted numerous fishing enterprises in resolving fish storage issues. A notable example is the case of a Maldivian customer. Five years ago, a Maldivian marine shipyard contacted us. Their clients reported that the ships in operation lacked refrigeration equipment, resulting in a large number of caught fish perishing due to temperature differences. Consequently, they intended to install marine chillers on all their ships. Since the installation of our marine water chillers, the water temperature has been kept at an appropriate level, ensuring the fish stay fresh. The performance and capabilities of our marine chillers left a profound mark on the customer. They are now constructing a new shipbuilding factory and plan to equip all future ships with Hengde's marine chillers.

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