Th ermostatic expansion valves for ammonia Type TEA · Technical leaﬂet Thermostatic expansion valves for ammonia, type TEA Capacity in kW, range −50 to 0°C R 717 (NH3) Example

Th ermostatic expansion valves for ammoniaType TEA

Technical leafl etREFRIGERATION AND AIR CONDITIONING

2 RD1EA202 © Danfoss A/S (RC-CMS/MWA), 01 - 2005

Technical leaflet Thermostatic expansion valves for ammonia, type TEA

Introduction Thermostatic expansion valves regulate the injection of refrigerant liquid into evaporators.Injection is controlled by the refrigerant superheat.

Therefore the valves are especially suitable for liquid injection in „dry“ evaporators where the superheat at the evaporator outlet follows the evaporator load proportionally.

Features Large temperature range: −50 to +30°C Can be used in both freezing and refrigeration systems.

Interchangeable orifice assemblies

Interchangeable thermostatic element

Rated capacities from 3.5 to 295 kW, 1 to 85 tons (TR).

External superheat setting Can be matched to all evaporators to give optimum evaporator utilization.

Patented double contact bulb Fast and easy to install. Good temperature transfer from tube to bulb.

Materials Valve housing made of GGG40.3

Technical data Refrigerant R 717 (NH3)

Evaporating temperature range D: −50 to 0°C P: −20 to +30°C

Capillary tube length 5 m

Connection for external pressure equalization 1⁄4 in. or ∅ 6.5 / ∅ 10 mm weld nipple. An 8 mm self-cutting union can also be used.

Max. bulb temperature 100°C

Max. working pressure PS/MWP = 19 bar

Max. test pressure 28.5 bar

Identification

Element label Orifice assembly marking

The thermostatic elementhas a white label attached to its top.The colour refers to the refrigerant for which the valve is designed: R 717 (NH3).

The orifice assemblyis marked with − valve type (TEA 20)− rated capacity (8 TR = 28 kW)− refrigerant R 717 (NH3)− date stamp

Gaskets are non asbestos

© Danfoss A/S (RC-CMS/MWA), 01 - 2005 RD1EA202 3


Ordering

Note:Subcooling of the liquid in front of the valve is essential for the function of the valve. Lack of subcooling will lead to malfunction of the valve, and increased wear on the orifice.

Type andrated capacity

in tons

Ratedcapacity 1)

Connectionweld flanges

Code no.

Inlet Outlet Assembledvalve

Separate strainer 2)

Separate orificeassembly

Separatethermostatic

element

(TR) kW in. in.

TEA 20, range: −50 to 0°C

TEA 20-1TEA 20-2TEA 20-3TEA 20-5TEA 20-8TEA 20-12TEA 20-20

3.57

10.517.5284270

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

068G6000068G6001068G6002068G6003068G6004068G6005068G6006

006-0042

068G2050068G2051068G2052068G2053068G2054068G2055068G2056

068G3250

TEA 20, range : −20 to +30°C

TEA 20-1TEA 20-2TEA 20-3TEA 20-5TEA 20-8TEA 20-12TEA 20-20

3.57

10.517.5284270

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

1⁄2

068G6137068G6133068G6134068G6138068G6139068G6140068G6135

006-0042

068G2050068G2051068G2052068G2053068G2054068G2055068G2056

068G3252

TEA 85, range: −50 to 0°C

TEA85-33TEA 85-55TEA 85-85

115190295

3⁄43⁄43⁄4

3⁄43⁄43⁄4

068G6007068G6008068G6009

006-0048068G2057068G2058068G2059

068G3250

TEA 85, range: −20 to +30°C

TEA85-33TEA 85-55TEA 85-85

115190295

3⁄43⁄43⁄4

3⁄43⁄43⁄4

068G6141068G6142068G6143

006-0048068G2057068G2058068G2059

068G3252

1) The rated capacity is the valve capacity at −15°C evaporating temperature and +32°C condensing temperature. The capacities are based on approx. 4 K subcooling ahead of valve. 2) The filter is supplied with gaskets, bolts and nuts.



R 717 (NH3)Capacity in kW, range −50 to 0°C

Example Now, from the capacity table at an evaporating temperature te = −20°C and ∆p = 10 bar, the capacity is 267 kW.

The column on the far left of this point gives the valve designation: TEA 85-85.

The ordering table gives the code no. for TEA 85-85: 068G6009.

Generally, the maximum capacity of a valve is approx. 20% higher than the value given in the table.

If a different capacity is subsequently required, a separate orifice assembly with a suitable rated capacity can be ordered to replace the one fitted in the installed valve.

1) Subcooling ∆t = 4K ahead of the valve.

Type and rated capacityin tons (TR)

Pressure drop across valve ∆p bar Pressure drop across valve ∆p bar

2 4 6 8 10 12 14 16 2 4 6 8 10 12 14 16

Evaporating temperature 0°C Evaporating temperature −10°C

TEA 20-1TEA 20-2TEA 20-3TEA 20-5TEA 20-8TEA 20-12TEA 20-20TEA 85-33TEA 85-55TEA 85-85

2.14.15.9

10.515.724.440.769.3114180

2.95.68.3

14.122.133.155.092.8151238

3.36.59.9

16.726.239.566.3110180285

3.77.4

11.218.629.744.574.4122204320

4.18.1

12.120.232.048.380.9134221343

4.38.6

13.021.534.351.886.1145238366

4.59.0

13.522.436.154.790.2151250384

4.89.3

14.023.337.256.493.7157256395

2.75.27.8

12.920.931.451.885.6145221

3.06.09.1

15.124.436.660.5101169256

3.36.8

10.117.127.941.968.6113186291

3.67.5

11.218.730.245.075.1122204314

4.08.0

12.020.031.747.779.1134221337

4.28.3

12.620.833.150.083.3140233355

4.48.7

13.021.534.352.385.6145244372

Evaporating temperature −20°C Evaporating temperature −30°C


2.24.36.5

11.017.425.644.272.1116180

2.64.97.4

12.920.430.851.284.9145221

2.95.68.5

14.422.734.957.694.9163244

3.16.29.4

15.625.037.261.6103174267

3.36.6

10.016.526.239.565.7109180279

3.56.9

10.417.227.341.968.6114186291

3.77.1

10.617.727.943.072.1116192302

2.04.16.2

10.116.325.040.768.6114174

2.24.56.9

11.318.027.945.475.0128192

2.44.97.4

12.319.830.249.480.9140209

2.65.27.9

13.120.931.452.385.6145221

2.85.58.3

13.722.132.654.790.2151233

2.95.68.5

14.322.733.757.094.2157244



1.33.14.88.0

12.819.232.052.386.8134

1.73.55.28.7

14.020.935.558.296.5151

1.93.85.79.4

15.122.738.461.6104163

2.04.06.0

10.116.324.440.765.1110174

2.24.26.4

10.616.926.243.068.6116180

2.34.46.6

11.017.427.344.872.1122186

1.22.43.76.09.3

14.524.439.566.3104

1.32.74.16.6

10.515.726.243.672.1113

1.42.84.37.1

11.016.927.946.577.8122

1.53.04.57.6

11.618.029.749.481.9128

1.63.14.87.9

12.219.231.451.886.1134

1.73.35.08.3

12.820.432.654.189.6140

Given:Refrigerant = R 717 (NH3)Evaporator capacity Qe = 265 kW (75.3 TR)Evaporating temperature te = −20°C(~pe = 1.9 bar)Condensing temperature tc = +32°C(~pc = 12.4 bar)Subcooling ∆t = 4KIf the pressure drop ∆p1 across pipelines, etc. is calculated, for example, as 0.5 bar, the effective pressure drop across the thermostatic valve becomes∆p = pc − pe − p1 ∆p = 12.4 − 1.9 − 0.5 = 10 bar.



Type and rated capacityin tons (TR)

Pressure drop across valve ∆p bar Pressure drop across valve ∆p bar

2 4 6 8 10 12 14 16 2 4 6 8 10 12 14 16

Evaporating temperature +30°C Evaporating temperature +20°C


2.64.75.6

11.619.929.142.983.0134196

3.46.57.8

16.027.339.666.2106179257

3.97.59.3

19.031.345.374.6122205297

4.38.1

10.420.934.449.281.1133222328

4.68.7

11.422.236.652.286.4143236353

4.89.2

12.223.438.655.290.9150248374

5.09.6

12.924.540.357.794.8158259392

5.29.9

13.525.441.859.898.3164268408

2.74.95.9

12.120.730.250.785.0137200

3.46.68.0

16.528.140.265.9106181258

3.97.59.6

19.331.545.073.8120202296

4.28.1

10.820.934.248.880.0132219326

4.58.7

11.722.236.552.085.2141233351

4.89.1

12.523.438.454.889.7149245372

4.99.5

13.224.440.157.293.7156256390

5.19.9

13.925.441.659.397.2163265406

Evaporating temperature +10°C Evaporating temperature 0°C


2.65.16.1

12.521.330.951.684.0140200

3.36.68.3

17.027.839.564.5104178255

3.87.49.8

19.131.144.272.1118198292

4.28.0

11.020.733.747.978.2129214321

4.48.6

12.022.036.051.183.4139228346

4.79.0

12.823.237.953.988.0147241367

4.99.5

13.524.339.656.392.0153251385

5.09.9

14.125.241.258.595.6160261401

2.65.26.3

12.921.831.451.782.0139196

3.26.48.5

16.827.138.462.3101172248

3.77.2

10.018.730.342.969.8114192285

4.17.9

11.220.333.046.776.0126208314

4.38.4

12.121.735.249.981.3135223339

4.68.9

12.922.937.252.785.9143235360

4.89.4

13.623.939.055.290.0151246378

5.09.7

14.224.940.557.493.7157256395



3.16.18.5

15.624.736.959.797.0165239

3.66.9

10.017.527.841.567.3111185276

3.97.5

11.219.130.445.373.6122202306

4.28.1

12.120.432.648.679.0131216331

4.48.6

12.921.634.651.583.7140229352

4.69.0

13.522.736.354.087.9147241371

4.89.4

14.123.637.856.391.7154251388

2.95.48.4

13.621.032.256.992.0158230

3.26.29.9

15.424.036.764.6107178267

3.56.8

11.017.026.540.471.0118196297

3.87.3

11.918.328.643.576.6128211323

4.07.8

12.519.430.446.381.4136224345

4.28.2

13.020.432.048.785.6144235364

4.48.6

13.421.333.450.989.5150245381

R 717 (NH3)Capacity in kW, range −20 to +30°C

1) Subcooling ∆t = 4K ahead of the valve.



GeneralTEA is equipped with interchangeable orifice assembly and thermostatic element.TEA is built up of three interchangeable main components:

Thermostatic element (1)

Orifice assembly (2)

Valve body (3), with flange connections

The valve has external equalization.A separate outlet orifice assembly (10) is for use with TEA 20-1 (3.5 kW) only.

The double contact bulb gives fast and precise reaction to temperature changes in the evaporator suction line, even with much reduced evaporator load. It also makes fitting the bulb quick and easy.The valves are able to withstand the effects that normally occur with hot gas defrosting.

The movement of the setting spindle is transferred by a gearwheel mechanism that ensures smooth superheat setting.The throttling section of the orifice assembly has a long operating life, the valve cone and seat being made of a special alloy steel with particularly good wear qualities.

Note:The TEA is not able to close completely tight. Consequently a solenoid valve is needed to shut off liquid supply when systems stops.

Design/Function TEA 20 / TEA 85

1. Thermostatic element (diaphragm) 2. Orifice assembly 3. Valve body 4. Superheat setting spindle (see „Instructions“) 5. Ext. pressure equalizing connection10. Separate outlet orifice (for TEA 20-1 only)

Dimensions and weights

Type H1 H2 H3 H4 L B Weight

Excl. strainer Incl. strainer Excl. strainer Incl. strainer

mm mm mm mm mm mm mm kg kg

TEA 20 94 38 25 96 110 164 80 2.1 3.0

TEA 85 104 37 35 106 125 199 95 3.0 4.5





Documents

Th ermostatic expansion valves for ammonia Type TEA · Technical leaﬂet Thermostatic expansion valves for ammonia, type TEA Capacity in kW, range −50 to 0°C R 717 (NH3) Example