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Unit Heater


Applying our company s 20 years of experience in manufacturing of heating and cooling systems and taking advantage of knowledgeable professionals in this field has enabled us to manufacture our unit heaters in 12 different types of hot water and steam, which are one of the best in Iran from viewpoint of heating efficiency and external design.

Casing:

  • The unit heater cases are manufactured from the finest steel in home appliance industry (ST14)and by specific molds and fixtures.After passing through the decreasing, phosphating, and rinsing paths, the parts of the unit heater cases enter a drying furnace. Once dried, the parts are electrostatically covered with alkyd-melamine resin (powder coating) and curded in the 200°C furnace.
  • In order to prevent vibrations from the electro-fans to fan cowls and casings and minimize the apparatus vibration, a separate supporting is designated for installation of electromotor, which results in Sabafarin s unit heaters being vibration-free.

Heating coil:

The coils in hot water unit heaters are manufactured from copper tubes 0 5/8 with wall thickness of 0.635 mm. The utilized fins are aluminum fin plates (12 fins per inch). The fins are manufactured by C.N.C. fin press. The copper hairpins are also bonded in C.N.C. bending machine . The connection between copper tubes and aluminum fins is granted by vertical N.C. expanders. The coils in steam unit heaters are manufactured from copper tubes 0 5/g with wall thickness of 1 mm or carbon steel seamless tubes 0 5/8 with wall thickness of 1.5 ~ and ASTM-A-179 material. The utilized fins are aluminum fin plates. Tubes with spiral fins are never used in manufacturing of unit heater coils due to their low heat transfer surface area and weak connection between fins and tubes.

  • Stainless steel tubes could be utilized in manufacturing of coils upon customer s request.
  • After being manufactured, hot water coils are hydraulically tested under 10 Bar pressure.The testing pressure for steam unit heaters is 30 Bar. Please note that all unit heaters have 2-row coils, except type 200, which has 3-row coils.

Electra motor:

The electromotors used in Sabafarin unit heaters are usually 2 speed single phase (900-1400 R.P.M) which are high-quality motors. Three phase or anti explosion electromotors (which are used in the environments with explosive gases)could be used upon the customers request.

Fan :

The utilized fans blades are from aluminum with thickness of 1.5 mm and hubs are from steels heel metal with thickness of 2 mm. The fans are completely balanced both statically and dynamically.The fan blades are also designed in a way that have an extremely low power usage.

Deflection Louvers:

The deflection louvers of Sabafarin unit heaters are adjustable which could be adjusted to direct the hot air to the desired location. In places which need a higher air throw, special deflection louvers with adjustable levers and in form of air foils ( flow optimizer ) could be used, which are able to force the air up to twice the usual deflection louvers and thus increase the heating efficiency. These louvers are placed on the unit heaters according to the customer s request. The performance of the flow optimizer is as follows: By locating these louvers on unit heaters, the directed air flow is generated, which increases the leaving air flow and decreases its mean temperature. The later results in elevated unit heater throw, decreased energy consumption and a more pleasant room temperature. The specific type and shape of the flow optimizer louvers draw the air around them towards the hot air leaving the unit heater ( Fig. 1 ), which results in increased volume of air, decrease temperature and enhanced throw.

   
Unit Heater With Folw Optimizer Louver Unit Heater With Standard Louver

The below figures display the optimized energy consumption in unit heaters with standard & flow optimizer louvers ( Fig. 2 & 3):

 

(Fig. 1) -The Induction Flow Optimizer Jetstream

 

 

(Fig. 2) - Air Flow Stream (Without Flow Optimizer Louver)

 

(Fig. 3) - Air Flow Stream (With Flow Optimizer Louver)

     


Technical specifications:

Various types of Sabafarin unit heaters are identified with the following numbers and letters:

Piping System in Vertical and Horizontal Unit Heaters:

The piping procedures could be found in the following figure. Choosing of the best piping method is based on their performance and also the location of the feeding source. The size of tubes, valves, filters, and steam traps should be determined according to ASHRAE standards and manufacturing company information. The best way is to consult with a professional engineer in this field who could figure out the sizing of the required instruments and minimize any possible future risk.

Hot Water Piping System Steam Piping System

Technical specifications:

The data in the following table are tabulated based on the inlet air temperature of 16°C, inlet hot water temperature of 90°C, and outlet temperature of 80°C from coil. The unit heaters should Repositioned in a way that the outlet hot air could cover all the desired areas. Also the air throw in the environment is calculated exclusive of other possible air movements.

a) Honzontal Discharge:

Unit Heater Type Max. Throw (m)
Without Flow Optimizer Louver
Max. Throw (m)
With Flow Optimizer Louver
4 POLE MOTOR
1400 r.p.m.
6 POLE MOTOR
900 r.p.m.
4 POLE MOTOR
1400 r.p.m.
6 POLE MOTOR
900 r.p.m.
SAUH&S 25 8 5.5 13 9
SAUH&S 50 11 7.5 16 13
SAUH&S 75 14 10 19 15
SAUH&S 100 16 12 21 15
SAUH&S 150 20 15 26 18
SAUH&S 200 18 14 23 16

b) Vertical Discharge:

HOT WATER WARM WATER AIR
Flow
C.F.M
Unit Type
°F
230/212
°C
110/100
°F
212/194
°C
100/90
°F
194/176
°C
90/80
°F
176/158
°C
80/70
Water Debit Outlet Air
Temp.
Heating
Cap.
Water Debit Outlet Air
Temp.
Heating
Cap.
Water Debit Outlet Air
Temp.
Heating
Cap.
Water Debit Outlet Air
Temp.
Heating
Cap.
GPM °F BTU/hr GPM °F BTU/hr GPM °F BTU/hr GPM °F BTU/hr
4.1 118 37600 3.8 113 34500 3.4 108 31250 3 102 27000 550 SAUHW-25-1
4 105 45000 4.6 101 41500 4.1 97 37500 3.6 93 32600 850 SAUHW-25-2
7 121 72000 7.3 116 66000 6.6 111 60000 5.7 104 52000 1000 SAUHW-50-1
9.5 109 86000 8.7 105 79000 7.9 101 72000 6.9 95 62600 1500 SAUHW-50-2
10.7 119 97000 9.8 114 89000 8.9 109 81000 7.7 102 70000 1400 SAUHW-75-1
12.9 107 117000 11.8 103 107000 10.7 99 97000 9.4 94 85000 2100 SAUHW-75-2
15.3 127 138500 14 122 127000 12.7 116 115000 11 108 100000 1750 SAUHW-100-1
18.2 114 165600 16.7 110 152000 15.2 105 138000 13.2 99 120000 2600 SAUHW-100-2
18.2 126 168000 17 121 154000 15.4 115 140000 13.4 108 122000 2150 SAUHW-125-1
22.3 113 201700 20.4 108 185000 18.5 104 168000 16 98 146000 3250 SAUHW-125-2
22.6 127 205000 21 123 189750 19 117 182500 16.6 110 150000 2600 SAUHW-150-1
27.1 113 246000 25.2 109 228000 22.8 104 207000 19.9 98 170000 3950 SAUHW-150-2
30.3 149 273000 28.1 144 253000 25.6 132 230000 22.2 126 200000 2600 SAUHW-200-1
36.4 130 328000 33.7 125 304 30.6 118 276000 27 113 240000 3950 SAUHW-200-2

 

PROPERTIES OF SATURATED STEAM
PRESSURE
(Psig)
0 2 3 5 8 10 15 20 25 30 35 40 45 50 60
TEMPERATURE (F) 212 218.47 221.5 227.16 234.78 239.41 249.73 258.79 266.85 274.08 280.64 286.74 292.37 297.7 307.3
LATENT HEAT
(B.T.U./LB)
970.4 966.2 964.27 960.54 955.58 952.45 945.49 939.26 933.63 928.5 923.77 919.27 915.14 911.24 903.91
PRESSURE
(Psig)
70 75 80 90 100 110 120 125 130 140 150 175 200 225 250
TEMPERATURE (F) 316.03 320 323.89 331.16 337.86 344.22 350.09 353 355.65 360.89 365.92 377.47 387.88 397.27 406.01
LATENT HEAT
(B.T.U./LB)
897.28 894.2 891.08 885.42 880.82 874.85 870.05 867.7 865.48 861.12 856.92 847.02 838 828.3 820

Performance data For steam unit heaters

STEAM PRESSURE AIR
Flow
C.F.M
Unit Type
90 PSIG 60 PSIG 30 PSIG 5 PSIG
Steam Debit Outlet Air
Temp.
Heating
Cap.
Steam Debit Outlet Air
Temp.
Heating
Cap.
Steam Debit Outlet Air
Temp.
Heating
Cap.
Water Debit Outlet Air
Temp.
Heating
Cap.
ib/hr °F BTU/hr ib/hr °F BTU/hr ib/hr °F BTU/hr GPM °F BTU/hr
62 146 56000 53 134 48500 45 126 43000 39 119 38000 550 SAUS-25-1
74 129 66900 64 119 58000 54 112 51000 46 106 45000 825 SAUS-25-2
118 150 106000 101 138 91500 86 129 81000 73 121 71500 1000 SAUS-50-1
141 132 126900 121 122 110000 103 115 97500 88 109 86000 1500 SAUS-50-2
177 156 159000 151 143 137500 128 134 121500 109 125 107000 1400 SAUS-75-1
211 137 190000 182 127 165000 154 119 146000 131 112 129000 2100 SAUS-75-2
246 167 221000 211 153 191500 179 142 169500 153 132 149500 1750 SAUS-100-1
294 146 265000 253 134 230000 215 125 203500 184 118 179500 2600 SAUS-100-2
300 168 270000 257 154 234000 219 143 207000 187 133 182500 2150 SAUS-125-1
359 147 323000 308 135 280000 262 126 248000 223 119 218500 3250 SAUS-125-2
364 169 329000 314 155 280000 269 144 254000 230 134 225000 2600 SAUS-150-1
438 148 396000 379 136 343000 323 127 305000 276 120 270000 3950 SAUS-150-2
483 205 440000 418 189 381000 356 172 339000 306 158 300000 2600 SAUS-200-1
581 177 529000 503 161 458000 428 149 407000 367 140 360000 3950 SAUS-200-2

Unit Heater Dimention

Model L(mm) H(mm) W(mm) Inlet/Outlet
SAUHW-25-1,2
SAUS-25-1,2
460 460 260 1"
SAUHW-50-1,2
SAUS-50-1,2
535 535 260 1 ¼"
SAUHW-75-1,2
SAUS-75-1,2
610 610 260 1 ¼"
SAUHW-100-1,2
SAUS-100-1,2
685 685 320 1 ¼"
SAUHW-150-1,2
SAUS-150-1,2
760 760 320 1 ¼"
SAUHW-200-1,2
SAUS-200-1,2
760 760 365 1 ¼"
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