HSYM FEATURES
· Analyzes Hot and Chilled Water HVAC Piping Systems
· Calculates Flows, Velocities, Pressures, & Temperatures
· Allows Up to 950 Pipe Sections and 600 Nodes
· Allows Up to 20 Chillers & Boilers
· Allows Up to 150 Coils, Exchangers, & Radiators
· Allows Up to 150 Valves of All Types
· Allows Up to 50 Constant & Variable Speed Pumps
· Considers Pipe Insulation Effects in Hot Water Systems
· Menu Driven with On-line Help Screens
· Instantaneous Input Error Checking

The Elite Software HSYM program analyzes centralized HVAC piping systems that use chilled and/or hot water. In the simulation of HVAC water piping systems, HSYM can determine pressure losses, actual operating pressures, temperatures of air and water, flow rates, and obtainable unit loads throughout the system. Complex systems containing all types and sizes of pipe, insulation, boilers, chillers, pumps, coils, exchangers, 2 and 3 way control valves, water temperature control valves, radiators, and insulation can be defined.

HSYM is not designed to size pipe or select equipment as are many other less sophisticated programs. Rather HSYM is designed to simulate the operation of an HVAC water as a whole. HSYM provides a cost effective way to obtain a steady state analysis of an existing or a proposed system. With HSYM a designer can investigate a myriad of design alternatives in seacrh of an optimal design that provides low cost and reliable performance. Besides sophisticated simulation techniques, HSYM also provides many mundane but useful features such as automatic adjustment of coil cfm values for altitude, calculation of effective coil UA values direct from manufacturer's catalog data, and the ability to automatically "look up" the equivalent length of all types of fittings.

HSYM provides both comprehensive input and output reports. Output reports show not only calculated results, but also all input data used in the results computations. HSYM calculates extremely fast and performs extensive error checking of the pipe network system.

CALCULATION METHOD
HSYM uses a unique sparse matrix technique for solving pipe network simulation problems. Most of the modeling algorithms used in HSYM are based on ASHRAE sponsored research work performed by the University of Illinois.

PROGRAM INPUT
HSYM is a true Windows program complete with toolbars and hyperlinked help. All data is checked at the time of entry so that no improper data can be entered. Three major types of data are requested: General Project Data, Detailed Pipe Data, and Equipment Data. The general project data includes the date, project location, client, designer, and project names, the altitude, pipe material data, and more. The detailed pipe data includes the pipe begining and ending node numbers, diameters, lengths, fitting information, insulation values if any, and indication of what equipment the pipes connect to.

The equipment data involves the entry of any boilers, chillers, pumps, coils, heat exchangers, radiators, loop valves, water temperature control valves, and other valves. Each equipment item also has certain details that must be entered. Boilers and chillers require temperature set points and capcity ratings. Pumps require that at least four data points from the pump performance curve be entered. Valves and coils require manufacturer design data to be entered concerning design water and air flow, and entering and leaving water remperatures. Load data must also be entered for coils, radiators, and heat exchangers.

PROGRAM OUTPUT
The HSYM Program provides four basic output reports: pipe input data, equipment input data, pipe output data, and equipment output data. The pipe input data report lists all the detailed pipe data (material type, diameter, length, fittings, etc.) entered for the pipe network. The equipment input data report lists all the detailed information concerning each equipment item (chillers, boilers, coils, radiators, heat exchangers, pumps, etc.) specified in the system. The pipe output data report lists the flow, velocity, inlet water temperature, inlet and outlet water pressures, pressure losses, and any equipment for each pipe section.

The equipment output data report lists all operating conditions for each equipment item. Chillers and boilers are shown with setpoints and design capacity versus actual load. Cooling coils and radiators are shown with water flow, air flow quantities, entering and leaving air temperatures, actual load, and check valve flow quantities. The user can specify exactly what reports to print. Options are provided for specifying the starting page number and left hand margin.