1.1.1 general this manual is presented as general guidance. it is for mechanical engineers and others in the design and renovation of facilities for the department of veterans affairs (va). in order to provide the latitude needed for design; new concepts; etc.; deviations may be made from the technical requirements provided professional judgment is made that a safe; adequate; hospital quality level design will result; and approval is obtained from the va. deviations from those requirements included in public laws; federal regulations; executive orders; and similar regulations and users special requirements are not permitted. this manual contains some; but not all; of the criteria pertinent to the design of hvac systems for va hospitals. where va criteria is lacking or missing; follow industry standards such as ashrae; ari; nfpa; etc. 1.1.2 drawings the following information shall be shown on mh drawings: 220.127.116.11 hvac system design including indoor steam piping and walk - in refrigerators/freezers. see article 1.2 for additional information. 18.104.22.168 seismic design related to the hvac systems. 22.214.171.124 outdoor exposed or underground chilled water piping. 1.1.3 graphic standards the hvac system design documentation shall use the va standard symbols; abbreviations; standard details; and equipment schedules. see article 1.4 for specific requirements. 1.1.4 climatic conditions the outdoor climatic conditions shall be based on the requirements outlined in article 1.3 and information provided in article 5.4. these conditions are based on weather data listed in the ashrae handbook of fundamentals for weather stations; which are located at or near the va medical centers. the local professional engineers may recommend more severe outdoor climatic conditions; commonly used by them; for review and approval by the va. 1.1.5 ductwork/piping in the final design drawings (construction documents phase); all ductwork; regardless of sizes and/or complexity of layout(s); and piping above 152 - mm (6 - inch) size shall be clearly shown and identified in double line with all fittings and accessories. 1.1.6 engineering economic analysis to comply with public law 95 - 619; engineering economic analysis shall be performed; in accordance with the procedure outlined by the department of energy (doe) in national institute of standards and technology (nist) handbook 135 (life cycle cost federal energy management program); to select the most cost effective hvac system for the application. see paragraphs 2.5; 2.6 and 2.12 for restrictions on use of fan coils; radiant panels and dx systems. the additional features of the analysis are: (a) for systems comparison; a 20 - year life cycle shall be assumed. (b) the analysis may be performed by means of available public domain programs; such as; trace; e - cube; and carrier e20 - ii; etc. (c) for specific va requirements relative to the hvac systems configurations and limitations; see articles 1.3 and 2.1. (d) other relevant features are: 7 percent discount factor for future cost and no taxes or insurance in computing annual owning cost. 1.1.7 energy conservation certificate requirements energy conservation shall be emphasized in all aspects of building design. the buildings must meet the requirements of doe regulations; 10 cfr part 435; energy conservation voluntary performance standards for commercial and multi - family high rise residential buildings; mandatory for new federal buildings. a copy can be requested from the va. these standards are mandatory for all new va facilities. to demonstrate compliance with these regulations; it will be necessary for the a/e to provide the following information: 126.96.36.199 certificate of compliance the a/e shall certify that the building is designed to be in compliance with the applicable provisions outlined in the doe regulations identified above. a blank copy of the required certificate is attached in article 1.11. 188.8.131.52 estimated energy consumption with the final design submission of construction documents phase; the a/e shall estimate the energy consumption of the proposed new building(s) and provide a value in british thermal units (btus) per gross square foot (gsf) per year for each building. to accomplish this task; the following shall be done: (a) the building(s) operation shall be simulated on the basis of actual mechanical/electrical systems design. (b) use any of the public domain computer programs listed in paragraph 1.1.6(b) to calculate the estimated energy consumption.