DOE-2 Reference Manual Version 2.1 - DOE2.com

B. AVAILABLE HVAC DISTRIBUTION SYSTEMS1. General Discussion of SystemsThe SYSTEMS program mathematically simulates the heat and moisture exchangeprocesses that occur in secondary HVAC distribution systems. Likewise, itsimulates the performance of air circulating fans used in these systems. Whenthe user specifies one of the packaged systems (PSZ, PMZS, PVAVS, or PTAC),the SYSTEMS program sometimes simulates both the secondary HVAC distributionsystems and the primary HVAC systems (that equipment that, in a built-upsystem, would be simulated in the PLANT program). The user selects appropriatesystems (plus options) from a list of twenty-one different "standard" orfamiliar types of systems. The SYSTEMS program cannot, however, simulate twodifferent types of systems in one zone at the same time. For example, it isnot possible to simulate the cooling of a zone by both a Single Zone FanSystem (SZRH) and a Multizone Fan System (MZS). The available systems arelisted in Table IV.2 and are described in the following pages of this section.Input data required for simulation varies from system to system. A tableof applicable and required commands and keywords is included with each systemdescription. In general, however, the following information is required forbasic system simulation:• operating schedules (see keywords HEATING-SCHEDULE andCOOLING-SCHEDULE in the SYSTEM-CONTROL subcommand and keywordFAN-SCHEDULE in the SYSTEM-FANS subcommand),• space temperature control (see keywords HEAT-TEMP-SCH, COOL-TEMP-SCH,THERMOSTAT-TYPE, and THROTTLING-RANGE in the ZONE-CONTROL subcommand),• system design temperatures (see keywords DESIGN-HEAT-T andDESIGN-COOL-T in the ZONE-CONTROL subcommand and keywordsMAX-SUPPLY-T and MIN-SUPPLY-T in the SYSTEM-CONTROL subcommand),• outside air quantities (see SYSTEM-AIR and ZONE-AIR subcommands),• fan characteristics (see SYSTEM-FANS subcommand), and• identification of the zones served by the system (see keywordsPLENUM-NAMES and ZONE-NAMES in the SYSTEM instruction).2. List of Available Systems and OptionsA number of optional or alternative component and control features can besimulated by the program. The applicability of each option to the differentSYSTEM-TYPEs is shown in Table IV.2.The suggested approach to the beginning user is:a) choose a system(s) from Table IV.2,b) review the description of the chosen system(s) and its ApplicabilityTab le,c) go to Sec. C of this Chapter, where the commands and keywords aredefined, and then specify values for the applicable commands andkeywords (User Worksheets are included in Sec. C to assist the user).IV.10 (Revised 5/81)