CAN CSA-F379 SERIES-2009 Packaged solar domestic hot water systems (liquid-to-liquid heat transfer) (First Edition Update No 1 July 2011 Update No 2 December 2013 Update No 3 Decem.pdf

1、F379 Series-09Packaged solar domestic hot water systems (liquid-to-liquid heat transfer)Legal Notice for StandardsCanadian Standards Association (CSA) standards are developed through a consensus standards development process approved by the Standards Council of Canada. This process brings together v

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16、ument in any way or remove this Legal Notice from the attached standard;.sell this document without authorization from CSA; or.make an electronic copy of this document.If you do not agree with any of the terms and conditions contained in this Legal Notice, you may not load or use this document or ma

17、ke any copies of the contents hereof, and if you do make such copies, you are required to destroy them immediately. Use of this document constitutes your acceptance of the terms and conditions of this Legal Notice.Update No. 3CAN/CSA-F379 Series-09December 2014Note: For information about the Standar

18、ds Update Service or if you are missing any updates, go to shop.csa.ca or e-mail techsupportcsagroup.org.Title: Packaged solar domestic hot water systems (liquid-to-liquid heat transfer) originally published January 2009Revisions issued: Update No. 1 July 2011Supplement No. 1 March 2011Update No. 2

19、December 2013The following revisions have been formally approved and are marked by the symbol delta () in the margin on the attached replacement pages:Revised CAN/CSA-F379.1-09: Clauses 6.5.2 and 8.2.2New NoneDeleted NoneUpdate your copy by inserting these revised pages.Keep the pages you remove for

20、 reference. 2014 CSA GroupSupplement No. 1 to CSA F379 Series-09 Packaged solar domestic hot water systems (liquid-to-liquid heat transfer)December 20146.3 Corrosion6.3.1 Joints and connections between dissimilar metalsJoints and connections between dissimilar metals shall be made with compatible me

21、tals and shall not cause detrimental galvanic action.6.3.2 Compatibility of dissimilar materialsIncompatible dissimilar materials shall be isolated or treated to prevent degradation that could significantly impair their function under in-service conditions during the design life.Note: Components and

22、 materials such as gaskets, sealants, and coatings can yield degradation products during their service life without impairing their function or aesthetic properties; however, the degradation products could significantly impair the performance of other components in the system. Heat-transfer fluids,

23、including inhibited water, can decompose and produce scale buildup, which can cause deterioration of performance. This is particularly true of water heaters in which supply water is heated directly in the collector, and dissolved solids (calcium salts) precipitate.6.4 Collectors6.4.1 Solar collector

24、s shall meet the requirements of CAN/CSA-F378. The thermal performance test is not required unless this Standard requires the results of that test.6.4.2 Solar collector connections shall be designed to withstand the test temperature used for testing the collector absorber according to the requiremen

25、ts of CAN/CSA-F378, when tested according to the procedures in Clause 8.3 of this Standard.6.5 Tanks6.5.1 Tank drainageThe solar energy storage tank shall be drainable.6.5.1A Test pressure for pressurized tanksPressurized tanks shall be designed for a hydrostatic test pressure of 2000 kPa. The rated

26、 working pressure shall not exceed 50% of the hydrostatic test pressure. Note: See Clause 8.2 for the pressure test method. 6.5.2 Requirements for glass-lined storage tanksHot water storage tanks shall conform to applicable standards. 6.6 Pumps6.6.1 Standards and installationWhere applicable, pumps

27、or pump motors, or both, shall meet the requirements of applicable standards and codes and shall be installed(a) so that they are easily serviceable;(b) such that the net positive suction head requirements as defined by the pump manufacturer are met; and(c) in a location where the electrical compone

28、nts or connections will not come in contact with fluid from a tank overflow or from the outlet of a pressure/temperature-relief valve.Note: In Canada, requirements for the installation of electrical components are found in the Canadian Electrical Code, Part I.15(Replaces p. 15, March 2011)F379S1-11

29、2014 CSA GroupDecember 20146.6.2 SizingPumps shall be sized to overcome static liquid head and system friction. Pump motors and impellers shall be sized so as to prevent overloading of the motor. Adequate positive suction head shall be provided to prevent cavitation.6.6.3 StagingPumps may be staged

30、in order to meet liquid delivery requirements provided that the failure of one of the pumps in the system does not constitute a hazard.6.6.4 Materials of constructionCirculating pumps used for handling water or other non-corrosion-inhibited heat-transfer fluids shall be constructed of corrosion-resi

31、stant materials.6.7 Heat exchangersHeat exchangers used in solar domestic hot water heaters shall conform to the health and safety requirements specified in Clause 7.4.6.8 Deleted6.9 Auxiliary heating systemsIn a solar-plus-supplemental system, the auxiliary heating system shall meet the applicable

32、safety standards for the auxiliary energy source.Note: For possibly applicable standards see, e.g., CAN/CSA-C22.2 No. 110 for electric energy sources, ANSI Z21.10.1/ CSA 4.1 for gas energy sources, and B140.12 for oil energy sources. See also Table A.1.6.10 Plumbing6.10.1 Diaphragms or bellowsDiaphr

33、agms or bellows, when used as barriers in control piping that bypasses one or more check valves, shall be installed in such that evidence of their failure will be detectable.6.10.2 Air ports and vent portsPorts shall be protected against the collection of debris, which can reduce the flow area and a

34、dversely affect the performance of the system. There shall be no provision for making a direct connection to a vent port.6.10.3 Entrapped airSystems shall provide suitable means for air or gas removal from high points in the piping systems.6.10.4 Vacuum relief protectionClosed storage tanks and pipi

35、ng shall be protected against collapsing from vacuum-induced pressure. Such components shall be designed to withstand such pressures or have vacuum relief protection.6.10.5 FiltersThe system shall have filters or other means to prevent contamination by foreign substances, which can impair the flow a

36、nd quality of the heat-transfer fluid beyond acceptable limits.Filters in contact with potable water shall meet codes and standards applicable to potable water systems.6.10.6 InterconnectionsInterconnections between an auxiliary energy system and the solar energy system shall be made in a manner tha

37、t will not result in temperatures or pressures exceeding the allowable design conditions in either system (in operational or non-operational mode). The interconnections shall not compromise or bypass the safety devices.(Replaces p. 16, March 2011)16 2014 CSA GroupSupplement No. 1 to CSA F379 Series-

38、09 Packaged solar domestic hot water systems (liquid-to-liquid heat transfer)December 20147.4.3.9 Except where permitted by the system design, liquids that are exposed to maximum and minimum service temperatures and pressures during their design life shall not(a) freeze; (b) give rise to excessive p

39、recipitation or otherwise lose their homogeneity; (c) boil; (d) change absorptivity; (e) change pH; or (f) change viscosity beyond the design ranges. Notes: (1) See Clause 9.3.1.2 for marking requirements for heat-transfer fluid. (2) Although boiling can be prevented by pressurization, excessive tem

40、peratures can break down constituents of some heat-transfer fluids to form organic acids. Buffers can counter the pH balance, but only until they are exhausted. Changes in pH may occur, but when the allowable range is exceeded, the transfer liquid, or at least the buffers, should be renewed. This ca

41、n be a maintenance requirement.(3) Thermal cycling can cause precipitation, which can lead to malfunction through a buildup of solids in pump seals and valve seats.(4) If not accommodated in the design, viscosity changes in heat-transfer fluids can cause pumping problems such as excessive pumping po

42、wer requirements or overheating due to thickened heat-transfer fluid.7.4.4 Test requirementsThe pressure rating of heat exchangers used in SDHW systems shall be tested in accordance with Clause 8.10 using a representative sample.Notes: (1) The discharge of toxic, corrosive, combustible, or explosive

43、 liquids into sewers can create serious health and safety hazards both within the immediate community and at a considerable distance along watercourses into which the sewers discharge. Safe disposal of such liquids involves, at minimum, consideration of composition, concentrations and frequency of d

44、ischarge, and the nature of the sewage treatment and disposal system available at the site. In some instances, catchment of this discharge and removal to specialized treatment facilities is the only acceptable disposal method. Under such conditions, adequately sized and protected catch basins should

45、 be provided. The leakage of toxic liquids into the ground can contaminate groundwater. In addition, leakage of some heat-transfer fluids can damage roofing, sealants, and other building materials. Leakage of combustible liquids can pose a fire hazard when exposed to external ignition or heat loss.(

46、2) Corrosive, toxic, or high-temperature (over 60 C) heat-transfer fluids (which can destroy or injure a drain, sewer soil, or waste pipe; create noxious or toxic fumes; or interfere with sewage treatment processes) should not be discharged into a plumbing system without being thoroughly diluted, ne

47、utralized, or treated by being passed through a properly constructed and acceptable dilution or neutralizing device. The nature of the corrosive or harmful waste and the method of its treatment or distribution should be acceptable to the authorities having jurisdiction.8 Testing8.1 GeneralThe SDHW s

48、ystem shall be assembled according to the manufacturers instructions and tested as specified in Clauses 8.2 to 8.10. For add-on packaged SDWH systems, the system shall be assembled with an approved thermal storage device, and all reports shall clearly identify the particular approved storage device

49、used during testing.8.2 Pressure test8.2.1 Collector loop pipingClosed-loop solar heating system piping using liquid heat-transfer fluids not directly connected to the potable water supply shall be tested at not less than 1.5 times the maximum design operating pressure for a minimum of 15 min using the manufacturers recommended working liquid.23(Replaces p. 23, March 2011)F379S1-11 2014 CSA GroupDecember 20148.2.2 Domestic water system plumbingThe portion of the solar heating system connected to the domestic water system shall be isolated and tested as follows:(a)