15 Glenbrook Drive, Prospect Heights Illinois 60070-1063 USA §

Phone: 1-630-258-3143 Fax: 1-847-215-0243 §

E-mail: yoram@heattransfertechnologies.com Web: www.heattransfertechnologies.com

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Heat Transfer Technologies Capabilities: HTT is backed by more than 20 years experience in design and manufacturing of heat exchangers. This experience is put to use in the manufacturing of prototype heat exchangers for pre-production evaluation. Various construction types include “tube-and-fin”, “parallel flow” “shell-and-tube” and “plate-type” heat exchangers. Typical construction materials are aluminum, copper and stainless steel. Joining method include Aluminum brazing, copper brazing, mechanical expansion, Tin-Diffusion and soldering. Heat transfer fluids include refrigerant, various liquids and air. HTT has helped numerous companies get into copper and aluminum brazing production here in the US and abroad. HX component design, component manufacturing, assembly, fixturing, cleaning, brazing furnace profile settings and quality control all included. HTT uses these companies for prototype production when in-house operation is not possible due to HX size of other limitation. HTT has designed many unconventional heat exchangers. For example,

• Brazed aluminum header and tank design with special flow circuiting resulting in 10% increased performance (1)

• 0.8mm OD tube miniature heat exchanger (2)

• Cylindrical HX using copper foam as fins (3)

• Cylindrical HX using heat pipes and aluminum fins (4)

• Brazed Copper microchannel tube serpentine copper fin evaporator (5)

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HTT is working with numerous academic institutions on the development of new technologies and their associated heat exchangers. Some notable developments:

• Ohio State University: Copper microchannel tube extrusions – manufactured a brazed all-copper microchannel tube evaporator (shown)

• MIT: Sorption thermal storage system HX • University of Maryland: DoE miniature HX • International Copper Association: Development of 5 and 4mm small diameter tube HX for HVACR

Recent awards: • DE-FOA-0000413: High-Performance, Cold-Climate Heat Pumps (CCHP) for Residential and Commercial

Buildings. • DoD-2014.1 SBIR N141-068: Advanced Two-Phase Heat Exchangers for Environmental Control. • DE-EE0006114 - Miniaturized air to refrigerant Heat exchanger

Component manufacturing:

• Headers, manifolds, tanks, siderails, expansion tanks • Special manifolds headers and components for unconventional flow

circuiting Heat exchanger assembly:

• Round tubes, down to a minimum of 0.8mm diameter (DoE miniature HX) • Flat tubes with serpentine louvered fins into headers and tank assembly and

side support • Flat extruded tubes with serpentine louvered fins into manifolds • Fixture design for proper post-braze dimensions

Heat exchanger brazing:

• In-house furnace: Face area up to 20” wide x 20” long, any tube depth and manifold option. • Off-site furnace: Face area up to 30” wide x 120” long, 18 and 25.4mm tube depth options, Single and

double row construction Heat exchanger testing:

• Hydrostatic testing to 200bar (3000psi) Notes: Some capabilities are outsourced locally when in-house equipment is incapable of performing the desired work, for example, due to size limitation. Experience:

• Manufacturing o Copper brazing, including the CuproBraze® process o Aluminum brazing, including the Nocolok® process o Tin diffusion brazing o Leaded, Lead-free and Silver Soldering o Mechanical expansion of round tubes

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o Special single component epoxy joining • Component Design

o Fin and tube optimization o Tank, header and manifold design

• Heat exchangers sized to optimize heat transfer, pressure drop, weight and envelope size • Validation specifications

o Pressure cycle o Thermal cycle o Vibration o Fatigue

• CAB furnace process optimization o Zone heat vs. part heat o Gas flow vs. oxygen level o Development of novel designs, processes and applications as exemplified by numerous patents,

many awarded to Heat Transfer Technologies’ customers. Rev. 2. Oct. 2014