What are the auxiliary equipment of refrigeration system in cold storage?

In addition to the main equipment necessary for refrigeration cycle, the refrigeration system of cold storage needs to be equipped with the following auxiliary equipment: ① oil separator; ② Ammonia liquid separator; ③ air separator; (4) auxiliary heat exchanger; ⑤ Reservoir; 6. Emergency ammonia leakage device; ⑦ Filters and dryers; 8 valves; Pet-name ruby cooling water circulation system, etc.