Chilled Water Systems

A chiller plant is rated in tons but it runs on a temperature difference. Most plants that fail to deliver their nameplate capacity have nothing wrong with the machines — they have a delta-T that has fallen below design, so the water circulates twice and carries half. Plant layout with primary and secondary circuits, flow from load and the design temperature difference with the low delta-T syndrome, pipe sizing by velocity and friction rate, total head on the critical circuit, pump selection and net positive suction head, variable flow and the affinity laws, expansion pressurisation and air, balancing, then insulation against condensation. 10 fully worked examples, every number checked. To ASHRAE Handbook — HVAC Systems and Equipment, ASHRAE 90.1 · SBC 601, Hydraulic Institute ANSI/HI. 30 pages · Level EL 200 · Revision A. Whoever owns revision A receives every later revision free.