DHE Detector Head Electronics Monsoon 80mm Crate Heat Load 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois
Crate Parts 60mm (x) on MAIN PLENUM (at both ends, only this end shown here) power supply is in the middle (at both ends) HEAT EXCHANGERS connect in series with ¼ copper tube MONSOON CARDS (0) plug in on this side (6U x 60mm Eurocards) HEAT EXCHANGER on CHILLER PLENUM (one at each end of main MONSOON cards) 9mm (x) on PLENUM (one at each end of transition cards) 006 Oct. 9 TRANSITION CARDS (8) (6U x 80mm) DES Project -- Vaidas Simaitis, University of Illinois
Crate (without shield) VICOR power supply with built-in 80mm fan, cfm listed, pressure drop unknown (x) POWER SUPPLY PLENUM MAIN PLENUM 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 3
Air Heat Load Diagram PWR SUPPLY PLENUM CFM VICOR PS 3 W 80 mm built in CFM 9 W 9 W PS 8 W CFM VICOR PS 0 W 80 mm built in CFM PS 8 W 9 W 9 W W W PLENUM 60 CFM MONSOON TRANSITION CARDS 50 W 60 CFM PLENUM W W 0 CFM MAIN PLENUM COLD WATER HEAT EXCH -0 W COLD PLENUM 0 CFM MONSOON MAIN MODULES 05 W 0 CFM COLD PLENUM COLD WATER HEAT EXCH -05 W 0 CFM MAIN PLENUM 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 4
Heat Exchanger Thermal Performance for Water The design uses a Lytron M05-050 heat exchanger For the target of 0 CFM air flow, and ½ gpm water flow, the heat removed is 4W for each C difference between the water in and the air in To remove 6W of heat, the water must be 9 C colder than the air 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 5
Air Temperature Change Chart For 00W at 0 CFM air flow, the air should rise about 3 C 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 6
Water Temperature Change Chart For 00W at ½ GPM water flow, the rise is about C 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 7
Heat Exchangers in Series To minimize the water flow needs, we can pipe the heat exchanger water in series If we choose C for the inlet water into the st heat exchanger, it should be about 3 C into the nd If the input air into the st heat exchanger is C, then 6 watts of heat is removed, and exit air is 8 C The input air into the nd heat exchanger should be C, 80 watts of heat removed, exit air is 8 C Equilibrium should be about 0 C for the electronics 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 8
Air Temperature Diagram PWR SUPPLY PLENUM 9 W 9 W PS 8 W CFM CFM C VICOR PS 3 W VICOR PS 0 W 80 mm built in 80 mm built in CFM CFM 8 C PS 8 W 9 W 9 W W W PLENUM 60 CFM C MONSOON TRANSITION CARDS 50 W 60 CFM 8 C PLENUM W W 0 CFM C COLD WATER HEAT EXCH 5 C -80 W 3 C COLD PLENUM 0 CFM MONSOON MAIN MODULES 0 CFM 05 W 8 C C COLD WATER HEAT EXCH -6 W 0 CFM 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 9 COLD PLENUM 8 C C
Water Pressure Chart The design uses a Lytron M05-050 heat exchanger At ½ GPM water flow, the water pressure drop is ½ PSI, or PSI for the in series 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 0
Water Supply According to COPPER.ORG : In general, the mains that serve fixture branches can be sized as follows: Up to three 3/8-inch branches can be served by a /-inch main. Up to three /-inch branches can be served by a 3/4-inch main. Up to three 3/4-inch branches can be served by a -inch main. The M05-050 uses 3/8-inch copper tubes, so we need a ½-inch main for the supply, with a flow of CFM 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois
Pressure Loss in Piping Pressure Loss of Water Due to Friction in Types K, L and M Copper Tube (psi per linear foot of tube) Nominal or standard size, inches Flow GPM K /4 L M K 3/8 L M K / L M K 3/4 L M 0.38 0.8 N/A 0.036 0.03 0.0 0.00 0.008 0.007 0.00 0.00 0.00 N/A 0. 0.084 0.075 0.035 0.0 0.04 0.006 0.005 0.004 3 N/A 0.75 0.77 0.59 0.074 0.06 0.05 0.04 0.0 0.009 4 N/A 0.5 0.06 0.086 0.03 0.08 0.05 5 N/A 0.89 0.6 0. 0.035 0.07 0.03 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois
Pressure Loss in Fittings Pressure Loss in Fittings and Valves Expressed as Equivalent Length of Tube, feet Nominal or standard size, inches 3/8 / 5/8 3/4 -/4 -/ -/ 3 Fittings Valves Standard Ell 90 Tee Coupling Side Straight 90 45 branch run Ball Gate Btfly Check 3 3 4 4 3 5 5 4 7 6 5 9 7 9 7 0 9 3 5 5 4 3-/ 9 3 4 4 5 6 8 5 6 6 7 3 3 6 9 7 34 3 3 6 8 9 50 3 3 5 39 NOTES: Allowances are for streamlined soldered fittings and recessed threaded fittings. For threaded fittings, double the allowances shown in the table. The equivalent lengths presented above are based upon a C factor of 50 in the Hazen-Williams friction loss formula. The lengths shown are rounded to the nearest half foot. 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 3
Pressure Loss for Gravity Pressure will be lost in lifting the water to the highest point in the system. To account for this, multiply the elevation of the highest point, in feet, by the factor 0.434, the pressure exerted by a -foot column of water. This will give the pressure in psi needed to raise the water to that level. For DES, the difference in height of about 40 feet reduces the available pressure by 8 psi (40 x 0.434 = 7.36). 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 4
Pressure Loss Total Approximately 0 3/8 elbows and connectors per heat exchanger is equivalent of 5 ft. of tubing. This is only about a 0. psi loss, but allow.0 psi. The camera is at least 40 feet from the ground, so allow about 00 feet of / tubing (each way) to the refrigeration unit. This is about a 7.0 psi loss, but recalculate for 3/8 tubing to allow for thicker walls, so use 6 psi. The pressure loss from gravity is 8 psi. (But may be recovered on the return trip?) Worst case loss should be about 45 psi. 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 5
CONCLUSION The calculations above are for water, but we will need a water-alcohol mixture to avoid freezing. We will need a refrigeration unit which can dissipate 500 W at a flow of GPM and output 45psi at 0 C. 006 Oct. 9 DES Project -- Vaidas Simaitis, University of Illinois 6