My family recently moved into a new school district, and our first-born son starts first grade next week. Today I will take him to his new school to familiarize him with his classroom, the gym, the lunchroom, etc. The school district calls this designated day Curiosity Day. Wouldn't it be great if we had "curiosity days" in business? Imagine how much less anxious we would be if we had a sneak peek into our customers' plants before we met with them to discuss potential problems.
In this issue of Process Cooling & Equipment, Roy Ahlgren of ITT's Bell & Gossett Div., Morton Grove, Ill., offers the next best thing to a curiosity day when it comes to selecting the right pump for your secondary refrigerant system. Given the variety of secondary refrigerants available and the increasing popularity of using secondary refrigerants instead of direct expansion coils, Ahlgren says it is wise to consider some of the problems that may result if some basic pump selection principles are ignored. Turn to page 38 for Ahlgren's explanation of how the usual practices in hydronic system pump selection must be modified when secondary refrigerants are being pumped through large systems.