Indirect Refrigerant Systems

There are two reasons for using an indirect refrigerant system. First, the amount of refrigerant can be kept at a minimum. Second, the risk of leakage of primary refrigerant is decreased. This means that refrigerants that are not wanted in systems in public buildings (e.g. ammonia) can still be used in the primary system, which can be kept in a safe sealed room. Using a BPHE as both evaporator and condenser in a refrigerant system will result in the most efficient and compact refrigeration system available. Utilizing secondary fluids (water or brines) as carriers for the cold and heat will bring the system size and refrigerant charge to an absolute minimum. No bulky air coil condenser is needed adjacent to the refrigerant system, which reduces the problem of noise. Instead, the secondary fluid can easily be carried away from the system and cooled at a convenient distance in a dry cooler. Additionally, the potential problem of transporting refrigerant over a long distance is avoided.

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