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Refrigerant Heat Exchangers

Packless Turbo Heat Exchangers are specifically intended for application on refrigeration systems to transfer heat between liquid refrigerant leaving the condenser on the high pressure side of the system and refrigerant vapor leaving the evaporator on the low pressure side of the system. All HXRS are UL listed. All LHXR's are UL recognized.

This heat transfer provides many benefits including:

  • evaporate any liquid in the suction line before it enters the compressor
  • subcool any vapor in the liquid line before it enters the TXV
  • raising the vapor temperature to prevent frost on the suction line
  • provide a small boost to system refrigerating capacity

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Available Models

Model ━ Capacity ▲ Length ━ Width ━ Height ━
HXR-25 12 hp 11 12 in 78 in 1 34 in
HXR-50 1 hp 12 34 in 78 in 2 516 in
HXR-75 1 12 hp 13 58 in 1 18 in 2 916 in
HXR-100 2 hp 14 18 in 1 38 in 2 1316 in
HXR-150 3 hp 14 18 in 1 38 in 3 in
HXR-250A 5 hp 14 14 in 1 58 in 3 916 in
HXR-350A 7 12 hp 16 14 in 1 58 in 3 916 in
HXR-500 10 hp 17 14 in 2 58 in 4 58 in
LHXR-15 15 hp 29 12 in 3 18 in 7 38 in
LHXR-20 20 hp 29 12 in 3 18 in 7 38 in
LHXR-25 25 hp 38 in 3 34 in 7 78 in
LHXR-30 30 hp 38 in 3 34 in 8 14 in
LHXR-35 35 hp 40 18 in 3 34 in 8 14 in
LHXR-40 40 hp 31 34 in 4 14 in 8 34 in
LHXR-50 50 hp 31 34 in 4 14 in 9 14 in

More Details

Packless Turbo Heat Exchangers utilize a coaxial "tube-in-tube" design. Refrigerant vapor flows through the inner tube while refrigerant liquid flows in the annulus between the inner and outer tubes.


The key to the high performance of Packless heat exchangers lies in the convoluted multi-lead inner tube manufactured in a patented process. The resulting convoluted tube has increased heat transfer surface area per unit length yet still permits full flow of refrigerant around its entire periphery for improved performance.

Turbulence imparted by the convolutions to the refrigerant flows further enhances the thermal performance with the net result being a highly effective, compact heat exchanger. Optimum heat transfer with Packless Turbo Heat Exchangers is achieved with a counterflow arrangement with the refrigerant vapor flowing through the center and the refrigerant liquid flowing within the annulus.

For nonstandard applications Packless heat exchangers can be obtained on a special order basis with different capacities and fittings. Tell us what you need and our engineers will assist in making it happen.

Each unit is furnished with I.D. sweat connections on both the vapor and liquid sides for ease of installation. Standard sizes are recognized or listed by Underwriter's Laboratories, Inc. (C-UL) for use with the following refrigerants:

R-410A R-23 R-125 R-134a R-401A
R-402A R-401B R-402B R-404A R-407A
R-407B R-407C R-412A R-502 R-507A
R-508 R-509 R-408A R-409A R-22

Selection Procedures

Refrigerant heat exchanger selection is predominantly dependent on nominal system horsepower. The HXR and LHXR models are rated for 10 °F liquid subcooling and 20 °F suction gas superheat for R-22 and R-502 systems. At this rating point the system is operating at 110 °F condensing temperature. For example on could use an HXR-250A for a nominal 5 hp system.

One should exercise caution to avoid selecting an undersized model. The use of an undersized model can cause system operation problems such as gas whistling and high suction side pressure drop. This may also have adverse effects on overall system performance.

In some applications the refrigerant heat exchanger is oversized to attain additional liquid subcooling and suction gas superheat. This is acceptable as long as the return gas temperature is less than 65 °F.

One can select a refrigerant heat exchanger by matching the system suction and liquid line sizes with the connection sizes of the heat exchanger only when the nominal system horsepower rating closely matches that of the system.