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7oi <br /> s <br /> Indirect <br /> In an indirect system, the primary <br /> refrigerant (R-22 for example) remains ' �-� <br /> in the refrigeration room. Heat is <br /> removed from the ice rink floor <br /> through a secondary refrigerant <br /> (glycol/water solution for example) <br /> that is circulated in the floor. The heat <br /> exchange between the primary and <br /> secondary refrigerants takes place in <br /> the refrigeration room. <br /> The life expectancy of either of these <br /> systems is 25-30 years. <br />