1、 STD-AR1 GUIDELINE F-ENGL 1997 0352320 0030734 5TZ 1997 GUIDELINE for Al R-CONDITIONING definitions of tem; factors and calculation procedures for determining humidification loads; equipment selection procedure; installation practices: and servicing practices. 1.1.1 Intent. This document is intended
2、 for the guidance of the industry, including manufacturers, engineers, installers contractors and users. 1.13 Review and Amendment. This document is subject to review and amendment as technology advances. Section2. Scope 2.1 Scope. ibis guideline applies to central system and self- contained humidif
3、iers, as defined in AR Standards 610 and 620, instailed in residential and small commercial applications. Section 3. Definitions 3.1 Definitions. All terms in this document will follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air-Conditi
4、oning and Refrigeration unless otherwise defined in this section. 3.2 33 Classes of Humidifiers. 3.2.1 Atomizing (Nozzle, Centrifugal, Ultrasonic). Discharges very fine droplets of water which evaporate to raise the level of relative humidity of the air. 333 Evaporative (Evaporative Wetted Media). D
5、ischarges water in the gaseous state to raise the level of relative humidity of the air. Its energy source is not an integral part of the humidifier. 3.23 Steam (Immersion Heaters, Electrodes). Discharges water in gaseous state to raise the level of humidity of the air. Its energy source is part of
6、the humidifier. Humidfier. A device to add moisture to the air. 33.1 Central System Humidifier. A humidifier that discharges into the air stream of a system. It may be mounted in or on the following: a Returnairduct b. Return air plenum c. Heating or cooling unit d. Supply air duct e. Supply air ple
7、num 33.2 Self-contained Humidifier. A humidifier that discharges into the space to be humidified and which is designed to be operated only with an installed water make-up he and electrical services. This device may or may not be installed within the humidified space. 3.4 “Shall,” “Should,” “Recommen
8、ded,” or “Il Is Recommended.” “Shall,” “should,” “recommended,” or “it is recommended” shall be interpreted as follows: 35 3.4.1 Shall. Where “shall” or “shall not” is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.4.2 Should, Recommended, o
9、r It Is Recommended. “Shouid,“ “recommended,” or “it is recommended” is used to indicate provisions which are not mandatory but which are desirable as good practice. Types of Water. 3.5.1 Demineralized Water. Water that has been treated to remove minerals. 3.53 Medium Hard Water. Untreated water wit
10、h a total minerai content of 5-15 grains per gallon 0.085- 0.257 grams per liter. 3.53 Naturals SOB Water. Untreated water with low mineral content-usually below 5 grains of total hardness per gallon O.OS5 grams of totai hardness per liter and relatively free of chlorides. 35.4 Softened Water. Water
11、 that has been treated by the ion exchange process (used widely in residential treatment) to exchange the hardness-causing minerals with water soluble sodium salts. Quantity of totai dissolved solids (TDS) remains unchanged. 1 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS un
12、der license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AR1 GUIDELINE F-1997 Type of Constniction Tight Average Loose 355 Very Hard Water. Untreated water with a total mineral content of more than 15 grains per gallon C0.257 grams per liter. 500 loo0 15
13、00 46.451 P2.901 U39.351 2.1 4.2 6.4 7.96 r15.921 24.26 3.3 6.5 9.8 12.51 24.64 37.14 4.6 92 13.8 17.43 34.87l 52.30 Section 4. Factors Affecting Design Load 2000 185.80 8.5 32.22 13.1 49.65 18.4 69.74 4.1 General. The following should be specified as a basis for the calculation of design humidifica
14、tion loads and equipment selec tion: 2500 r232.29 10.6 40.17 16.3 61.78 23.0 L87.171 a Design outside conditions b. Design inside conditions c. Size and physical characteristics of residence (1) Heated volume of space to be conditioned. (2) Tightness of structure, insulation, storm windows and doors
15、 or equivalent, etc. (CAUTION Some older structures may have inadequate protection against water vapor transmission through walls, which may result in damage from excessive moisture.) d. Quantity of outside air entering the heated volume of the structure (1) Exhaust fans (2) Fireplace dampers (Open
16、fireplace dampers greaiy increase the addition of outside air to the heated volume of the structure; satisfactory performance of a humidifier, as applied to a given structure, is based upon these dampers being closed.) (i) in calculating humidity load requirements in residential applications, intern
17、al load factors have not been included because of the variance which will occur in living habits, e.g., bathing and laundry habits, cooking, number of occupants, etc. e. Internal load generated 4.1.1 Design Outside Conditions. The design outside conditions to be used for calculating humidity require
18、ments are as follows: a for tight construction . . , . . . . . O“F -17.8“C and 80% R.H. b. for average construction . . . . . 20F -6.7“C and 80% R.H. c. for loose construction . . . . . . . 31F -0.6C and 80% R.H. 4.13 Design Inside Conditions.“ The design inside conditions tobe used for thecalculati
19、on of humidity hived h Fig. 1, Chapter 20,1996 ASHRA E Handbook WAC Systems and Equipment, see B 1.1. “obtained from Standad Rating Conditions of ARI Standards 610 and 620, See B 1.3 and 1.4 respectively. requirements are 75F 23.9“C and 30% R.H. 4.13 Ventilation. Ventilation in a residence is, in mo
20、st current practices, handled by infiltration. Some installations use a positive inlet duct. For load estimates, calculate the infiltration and positive air quantity (if any) and add the two. 4.13.1 as follows: Injiltration. Infiltration may be estimated a For tight construction-use i/2 air change p
21、er hour. b. For average construction-use 1 air change per hour. c. For loose construction and/or maximum ventilation factor-use 2 air changes per hour. Chapter 20 of the ASHRAE Handbook WAC Systems and Equipment defines a tight house as one “.assumed to be weil insulated, have vapor barriers, tight
22、storm doors and windows with weatherstripping, and its fireplace will be dampered. An average house will be insulated, have vapor barriers, loose storm doors and windows, and a damped fireplace. A loose house will probably be one constructed before 1930, have little or no insulation, no storm doors
23、or windows, no weatherstripping, no vapor barriers and quite often will have a fireplace without an effective damper.“ Section 5. Humidity Load Determination 5.1 Table 1. Humidity load requirements are determined from Table 1. Determination of Humidification Requirements, gallons per day liters per
24、dayrt Size of Building, sq. ft. ml 3000 (278.701 12.7 48.13 19.6 4.281 27.6 104.60 t Anamount of 2 galions per day t7.57 liers per day may be therefore, vacuum-clean through the mounting hole in the area of humidifier installation. In new systems, future construction and basement finishing must be c
25、onsidered and ample access must be reserved for the maintenance and service of the humidifier. 73.1 Outdoor Installation. Most humidifiers are intended for installation indoors and, unless the manufacturers instructions specifically allow unheated area installation, assume indoor heated location onl
26、y. 732 Prevention of Water Damage. If the humidifier is located in or above fmished space such that an accidental overflow may damage floors, carpets, wall frnishes, etc., a means should be provided to prevent damage in the event overflow occurs. If the humidifier has no provisions for connecting an
27、 ovefflow drain, a drain pan with a drain hose should be instailed beneath the humidifier. 7.4 Electrical Connections. Most humidifiers are low power consuming devices and can be connected in parallel with an existing motor load (with the same voltage) on an existing fuse. On muiti-speed blower moto
28、rs, avoid high voltage feedback loops from other speed taps. It should be noted that many humidifiers are designed to be connected to a separately protected circuit (See manufacturers specifications). A means for disconnecting the power supply to the humidifier shallbeprovided. AU wiring shall confo
29、rm to local, state and national codes. 7.4.1 It may be necessaq to wire steam generating units with time delay relays or temperature switches so when the humidifier is turned off, the funace blower continues to carry away the residual steam until the water is cooled. 7.42 It may be necessary to wire
30、 steam generating units and atomizing units with a sail or pressure differential switch to turn the humidifier off if air flow in the air handiing system is interrupted. 75 Start-up and Check-Out. After installation is completed, operate the total system through several complete cycles of events, pr
31、eferably with a system thermostat and humidistat, if installed. Observe for normal operation as recommended by manufacturer. Following the running of several complete cycles of events, set the thermostat system switch, temperature selector and humidistat at customers desired settings. It is also wis
32、e to have the user perform ail steps for familiarization. Before leaving the premises, present the owners manual to the customer and review it with him. 7.6 Customer Education. THIS CAN BE THE MOST IMPORTANT STEP IN THE INSTALLATION. Explain to the customer what to expect from the humidifier and sup
33、ervise him or her in a cleaning operation in order to instill self- confidence and make them aware of any precautions while doing this. Explain anythmg that they may later see or hear to prevent anxiety or dissatisfaction, such as condensation on windows, normal mineral buildup, normal operating sou
34、nds, etc. Mention time lag incident to reaching equilibrium in a new installation. Also indicate the advantages of humidification which they will enjoy and be sure to explain that limitations imposed by the structure will determine the level of humidity which can be maintained. Also, teach the custo
35、mer how and when to adjust the humidistat for various ranges of outdoor temperatures. Section 8. Senricing Practices 8.1 Regular Care and Servicing. As with ail automatic and mechanical devices, humidifiers require periodic maintenance and servicing either by the user or competent service personnel
36、to provide continued customer satisfaction, longer equipment life and a reduction in emergency service calls-resulting in lower annual cost to the customer. 8.2 Periodic Maintenance Check List. Appendix C contains an example of a check list for use by the user or service personnel. This type of chec
37、k list is a result of extensive use in the field by many service organizations and reflects their suggestions. There are two advantages to using a check list. First, it helps the service person to develop an efficient routine; and second, gives him an outline of service that can be reviewed by the o
38、wner. 5 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AR1 GUIDELINE F-1997 8.3 Special Maintenance Considerations. Humidifier designs are of three basic categories, evapo
39、rating, steam and atomizing. Depending upon the particular design of humidifier, there are usually special maintenance routines which must be foliowed regularly in order to insure continued performance of the unit. Since these routines will vary, it is particularly important that the user familiariz
40、e himself with any special maintenance considerations by studying the user material supplied with the humidifier. For new installations, the humidifier should be inspected monthly to determine a proper maintenance schedule. 6 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS und
41、er license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-STD-AR1 GUIDELINE F-ENGL 1777 .I 0352320 O010743 504 E AR1 GUIDELINE F-1997 APPENDIX A. REFERENCES = NORMATIVE None. APPENDIX B. REFERENCES = INFORMATIVE B1 Listed here are standards, handbooks and
42、other publications which may provide useful information and background but are not considered essential. References in this appendix are not considered part of the guideline. B1.l ASHRAE Handbook - 1996 Systems and Equipment, Chapter 20, Humidifiers, 1996, American Society of Heating, Refrigerating
43、and Air Conditioning En-, Inc., 1791 Tdlie Circle NE., Atlanta, GA 30329, U.S.A. B13 ARI Standard 610-96, Central System Humidijers for Residential Applications, 1996, Air- Conditioning and Refrigeration Institute, 4301 North Fairfax Drive, Suite 425, Arlington, Virginia, 22203, U.S.A. B1.4 ARI Stan
44、dard 620-96, Self-contained Humidifiers for Residential Applications, 1996, Air- Conditioning and Refrigeration Institute, 4301 North Fairfax Drive, Suite 425, Arlington, Virginia, 22203, U.S.A. Bl.2 ASHRAETermuiobgy of Heating, Ventilation, Air Conditioning & Refrigeration, 199 1, American . Societ
45、y of Heating, Refrigerating, and Air- Conditioning Engineers, Inc., 179 1 Tullie Circle NE, Atlanta, GA, 30329, U.S.A. 7 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,- ST
46、DmARI GUIDELINE F-ENGL 1777 0352120 OOLO7LlLl 440 AR1 GUIDELINE F-1997 APPENDIX C. PERIODIC MAINTENANCE CHECKLIST PREVENTIVE MAINTENANCE AND SERVICE CHECK LIST FOR HUMIDIFIERS Customer Address Equipment Location Contract No. Date Last Inspected Date ahis Inspection Inspected By Humidifier: Company N
47、ame: Model Number: inspect, Check, Clean and Adjust, When Necessary, All Items Listed EVAPORATING MEDIA OR ATOMIZER . o Clean or replace media, filters and flow resirictors, as required, or clean all parts, if atomizing STEAM GENERATORS o Replace cylinder or clean parts and replace immersion heater
48、SUMP AND DM LINES . o Clean sump and drain lines and make sure drains and drain lines are free of restrictions. Check for leaks and proper water level. FANS AND MOTORS cl Fan, check for deterioration and balance. Fan setscrew, check for tighmess. lubricate motor bearings as required. CONTROLS cl Wat
49、er flow, check for proper flow rate. Humidistat, check for proper operation. Ali elecmcal terminals for tighmess. Disconnect switch, check operation Key: J - OK, X - Need Additional Seniice, XX - Repair or Replace I I 8 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
