Unit Dimension Unit Nomenclature DEHUMIDIFIER NOMENCLATURE R K D A - 0050 - C Z - M 4-8 UNIT VOLTAGE: 2: 240/1/60 5: 208-240/3/60 9: 480/3/60 8: 600/3/60 REFRIGEREANT R-404a MEDIUM TEMPERATURE SCROLL COMPRESSOR COPELAND COMPRESSOR COMPRESSOR HP: 0050 = 5 HP; 0075 = 7.5 HP ARENA DEHUMIDIFIER KOOL-AIR REFRIGERATION 2
MOISTURE REMOVAL IN Lb./hr RKDA-0050-CZ-M4 80 58,1 49,3 39,3 29,3 19,2 11,8 4,2 70 48,5 40,9 33,5 25,9 18,4 10,9 3,4 60 45,4 37,3 29,3 21,2 13,3 5,3 0,7 50 34,6 28,2 21,7 15,2 8,7 2,3 0,5 40 26,6 21,7 16,8 11,6 6,5 1,6 0,4 30 19,4 15,7 12,1 8,6 5,0 1,3 0,3 ADDED HEAT IN kw RKDA-0050-CZ-M4 80 28,6 25,8 21,4 18,1 14,7 11,3 7,7 70 25,0 21,9 18,9 15,7 12,7 9,7 6,6 60 20,3 17,9 15,4 12,7 10,3 7,9 5,4 50 16,1 14,0 11,8 10,0 7,9 5,8 3,9 40 13,1 11,5 9,7 8,2 6,3 4,9 3,3 30 10,0 8,8 7,4 6,1 4,6 3,0 2,0 MOISTURE REMOVAL IN Lb./hr RKDA-0075-CZ-M4 80 73,9 63,1 53,3 43,2 33,3 23,4 15,7 70 61,5 53,8 46,1 38,4 30,8 23,1 15,4 60 50,7 43,2 35,8 28,4 21,0 13,6 6,2 50 42,7 36,3 30,0 23,6 17,3 11,0 4,7 40 33,2 28,3 23,3 18,2 13,4 8,3 3,3 30 25,2 21,2 17,3 13,4 9,4 5,4 1,5 ADDED HEAT IN kw RKDA-0075-CZ-M4 80 35,6 32,0 28,4 25,1 21,3 17,8 14,4 70 31,6 28,5 25,2 22,2 19,1 15,7 12,7 60 25,0 22,2 19,4 17,0 14,3 11,5 9,1 50 19,4 16,3 15,4 13,7 11,5 9,7 7,9 40 16,1 14,3 12,4 10,9 9,1 7,4 5,4 30 12,1 10,9 9,7 8,5 7,4 6,1 4,9 Electrical Data CFM WEIGHT VOLTAGE RLA COMPRESSOR LRA HEATER WATT MOTOR AMP. MCA BREAKER RKDA-0050-CZ-M4-2 3000 668 208-230/1/60 31.1 175 70 10.5 49.4 80 A RKDA-0050-CZ-M4-5 3000 668 208-230/3/60 22.1 115 70 5.2 32.8 50 A RKDA-0050-CZ-M4-9 3000 668 460/3/60 9.6 63 70 2.6 14.6 25 A RKDA-0050-CZ-M4-8 3000 668 575/3/60 7.2 50 70 2.08 11.1 20 A RKDA-0075-CZ-M4-5 3500 725 208-230/3/60 32.1 195 90 5.2 45.3 75 A RKDA-0075-CZ-M4-9 3500 725 460/3/60 16.4 95 90 2.6 23.1 40 A RKDA-0075-CZ-M4-8 3500 725 575/3/60 12.9 80 90 2.08 18.2 30 A 3
Example: 1: Rate of infiltration (as determined by tests or calculations) = 30,000 cu. F./hr 2: Maximum outdoor design condition = 90 F DB, 76 F WB 3: Design indoor condition = 60 F 4: Number of spectators = 330 Step 1 Step 2 Step 3 Step 4 Find specific volume of outside air at 90 F DB, 76 F WB from psychrometric chart: 14.2cu. Ft./lb. Of dry air. Determine minimum temperature of building structures resulting from the ice surface radiation effect. This temperature is affected by the distance between structure and ice surface, building material (steel, wood, etc.) and the colour of this material. In existing buildings, this temperatures can be determined through tests. A safe structure temperature is 5 F lower than room temperature and this is the maximum dew point temperature recommended in order to prevent condensation. Example: 60 F - 5 F = 55 F Determine difference in grain outdoor, indoor with the psychometric chart (_ w): Outside air at 90 F DB, 76 F WB = 114 grains/lb. of dry air Ice rink at 55 F dew point = 64 grains/lb. of dry air Example: 114 grains/lb. of dry air - 64 grains/lb. of dry air = 50 grains/lb. of dry air Find moisture removal requirement (Wt): Wt = Wi + Wo (lb./hr.) Wi = (Q x Delta w) / (V x 7000) Wo = N x Wsp Where: Wt = Required total moisture removal (lb./hr) Wi = Required moisture removal due to infiltration (lb./hr) Wo = Required moisture removal of all spectators (lb./hr) Q = Air infiltration (cu. ft./hr) Delta w = Change in grain as per Step 3 (grains/lb. Of dry air) V = Specific volume of outdoor air as per Step 1 (cu.ft./lb. Dry air) N = Number of spectators Wsp = Moisture generation constant for each spectator = 0.15 lb./hr./spectator Calculation: Wi = (30,000 x 50) / (14.2 x 7000) = 15.0 lb/hr. Wo = 330 x 0.15 = 49.5 lb./hr Wt = 64.5 lb./hr Step 5 Step 6 Determine indoor relative humidity at given 60 F DB, 55 F dew point = 85 % RH (see psychrometric chart) In order to obtain good air distribution, at least two units should be used. Select units from Moisture Removal chart. (Two RKDA-0050-CZ-M4 have a capacity of 33.3 lb./hr each at the given operating condition.) 4
Unit Location Side view Top view 5
Standard feature Kool-Air dehumidifier casing is made of prepainted white galvanized steel and all drain pans are made of insulated heavy gauge stainless steel with 1 1/4 FPT connection. Compressors are scroll compressors with internal motor protection, centrifugal oil pump for long trouble free operation. All compressors will be supplied with a crankcase heater to prevent refrigerant migration. The piping of all units includes receiver, suction accumulator with boil-out coil, thermostatic expansion valve, liquid drier, sight glass, liquid solenoid valve three way valves and check valve for hot gas defrost. All the piping is made out of copper tube, brazed connections and has an operating charge of R-404a. Each system is tested for leaks and performances. Our receiver is sized to hold the whole refrigerant charge for easy service of the unit. Rotalock valves are supplied at outlet, to isolate the refrigerant charge. All units to operate on a pump down cycle for a liquid free starting of the compressor and to minimize refrigerant migration. Evaporator and condenser coils are made of smooth copper tube mechanically expanded into self spacing aluminum plate fin for permanent bond and maximum heat transfer. All evaporator coils are leak tested at 300 psig and condenser at 400 psig. The fans used on these units are forward curved statically and dynamically balanced centrifugal blower with ball bearings. Each blower is coupled with an electric motor with adjustable pulley on the motor. Motors are 2 horse power open drip proof with permanently lubricated ball bearing. Overload relays are provided for 3 phase protection. Controls are located in an accessible control panel. Control panel include compressor contactor, motor starter, high and low pressure switch and mounted humidistat. External pilot colored lights (blue, green and yellow) are supplied for a quick assessment of what stage the unit is working. The Kool-Air RKDA unit operate on hot gas defrost actuated from a demand defrost control. The demand defrost control shall verify every 45 minutes (adjustable) if ice is present on the evaporator. If there is ice formation, it will actuate a defrost cycle and it will stop when the evaporator is ice free. REFRIGERATION KOOL-AIR INC. Québec, Canada Tel: (450) 632-5775 Fax: (450) 632-7412 Email: kool-air@kool-air-inc.com Web site: www.kool-air-inc.com Due to Kool-Air policies to continuously improve the quality of its products, specifications are subject to change without notice