1. 1 LBT Q2 2008 Eng/SW Review ICS – Instrument Cooling System

2. 2 Highlights (Q2/2008) IC system is operating, it has not been commissioned IC system is operating, it has not been commissioned Both sides are operating, lightly loaded Both sides are operating, lightly loaded Upper and lower tree house commissioned action item list is Upper and lower tree house commissioned action item list is

3. 3 Open Issues Technical Technical IC system not designed for fluctuating loads IC system not designed for fluctuating loads Heat exchanger on tree houses restrict flow to 7 gpm Heat exchanger on tree houses restrict flow to 7 gpm ICS needs to be tested to determine if design requirements are met, commissioning ICS needs to be tested to determine if design requirements are met, commissioning Chiller and IC system operates off of siphon principle, not good for our dynamic system Chiller and IC system operates off of siphon principle, not good for our dynamic system Schedule Schedule Verify operation, coil sizes, redo prints, proper bypass Verify operation, coil sizes, redo prints, proper bypass Financial Financial Maybe large if have to redesign, however, if it meets the requirements then there will be no more cost Maybe large if have to redesign, however, if it meets the requirements then there will be no more cost Resource Resource Searching for a consultant to address overall system design issues, has been a low priority, it will become high priority as instruments are added Searching for a consultant to address overall system design issues, has been a low priority, it will become high priority as instruments are added

4. 4 Planning (Q3/2008) Find a solution to the flow restriction in the tree houses Find a solution to the flow restriction in the tree houses Test IC system for heat load performance Test IC system for heat load performance Install larger expansion tanks and pressure pumps near the elevation axis Install larger expansion tanks and pressure pumps near the elevation axis