PACKAGED SYSTEMS - Heat Transfer Systems
Simplified Heat Transfer System
- Indirect Heating
- Packaged Systems
- Water and Water/Glycol Systems
- Non-Pressurized and Pressurized Heat Transfer (oil) Systems
- Vaporizers
Heat Transfer Systems Applications
Chromalox Heat Transfer Systems are used in process heating applications requiring
closely controlled process temperatures. Systems are furnished complete with heaters,
controls, pumps, valves and necessary plumbing and are used with:
Jacketed Vessels and Tanks — containing waxes, parafin, exotic
chemicals including those having exothermic reactions, hot melt adhesives, resins,
varnishes, paints, dyestuffs, molasses, vegetable oils and many other chemical or
petrochemical products.
Heated Rolls — for coating paper and paper products, spot
carbonizing, vinyl bonding, bonding with hot melt adhesives, calendering and laminating.
Heat Exchangers — for corrosive and noncorrosive uids.
Platens, Dies and Molds — for laminating wood and plastics,
forming of carbon products, epoxy materials and Fiberglas ® , plastics
extrusion, injection molding, molding rubber and plastic materials: vinyl bonding
and bonding with hot melt adhesives.
Pipeline Tracing — of viscous materials such as paints, fuel
oils, asphalt and many other chemical and petrochemical products for antifreeze
protection and/or maintaining pumping temperatures.
Industrial Systems — such as snow melting, comfort heating
and hot water supply and as standby equipment for industrial and commercial applications
in case the supply of other fuels is curtailed.
Simplified Heat Transfer System

Heat Transfer Systems Selection Guidelines
Chromalox Packaged Heat Transfer Systems can supply from 4 to 600 kW of heat energy
at are known, the recommended model of pack-up to 750°F operating temperatures.
The packaged heat transfer system can be estimatedage selection is usually based
on the operating from the following Selection Guidelines. temperature of the heated
process (tank, rolls, Further defi nitions and specifications follow on platens,
molds) and the heat energy requirements (kW) to maintain that temperature. Consult
the Technical section to calculate the heat energy requirements or contact the nearest
Chromalox Sales office for assistance.
When temperature and energy requirements are known, the recommended model of packaged
heat transfer system can be estimated from the Selection Guidelines.
Heat Transfer — Selection Guidelines
Heat Transfer Systems Application Data
Heat Transfer Systems can be categorized (grouped) by the type of fluid used in
transferring the heat to the process. Water and Water/ Glycol systems can be used
for temperatures up to 250°F. Special heat transfer fluids and oils can operate
up to 750°F and the fluid vaporizer systems utilize vapor phase heat energy
to give a higher heat of 750°F with lower operating pressures (150 psig). The
Reference Guidelines and General Specifications give more information to help your
selection.
Benefits & Advantages
Reliable and Proven Designs — Backed by more than 80 years
of engineering and manufacturing of electric heating equipment, Chromalox electric
fluid heat transfer systems are safe, versatile and easy to use, pre-engineered
heating or heating and cooling systems which operate at existing distribution voltages
(208-600 Volts).
Safe and Reliable Electrical Wiring — All wiring complies
with the National Electrical Code.
Heat Transfer Systems — Reference Guidelines
Heater Burnout Protection — Every heating chamber has an
overtemperature cutout which will de-energize the heater in case of an over-temperature
condition.
Matched Components — All Chromalox standard and special systems
are pre-engineered with correctly sized and matched components such as pumping rate
versus pipe line size, amperage draw versus electrical parts to ensure total system
performance.
Optional Controls — All Chromalox heat transfer systems are
available with the latest state-of-the-art solid state controls. These include microprocessor-based,
recording and SCR power controllers that can control fluid temperatures to ±
1°F. For a complete selection of optional controls refer to the Controls section.
Heat Transfer Systems — Reference Guidelines

Heat Transfer Systems — General Specifications
Model
|
System Type
|
Application
|
Oper.
Temp. (°F)
|
kW2
|
Mbh3
|
Max.
Operating
Pressure
|
ASME
|
Pressure
Rating &
Constr.
|
Con.
Type
|
CMX
|
Mold Temperature Controller
|
Water/Glycol
|
50-2501
|
4.5-24
|
15.3-81.8
|
Atmospheric
|
N/A3
|
125 Lb.
Threaded
|
NPT
|
CWG
|
Heat Transfer Non-Pressurized
|
Water/Glycol
|
50-2501
|
6-600
|
20.5-2,047
|
Atmospheric
|
Optional
|
150 Lb.
Welded
|
NPT
|
WMHTS4
|
Heat Transfer Multiple Zone
|
Water/Glycol
|
50-2501
|
6-1,200
|
20.5-4,094
|
125 psig
|
Optional
|
150 Lb.
Welded
|
NPT or Flanged
|
CMXO
|
Heat Transfer Non-Pressurized
|
Heat Transfer
Fluid/Oil
|
50-550
|
6-24
|
20.4-81.9
|
Atmospheric
|
N/A3
|
125 Lb.
Welded
|
NPT
|
COS
|
Heat Transfer Non-Pressurized
|
Heat Transfer
Fluid/Oil
|
50-650
|
9-400
|
30.7-1,365
|
Atmospheric
|
Optional
|
150 Lb.
Welded
|
150 Lb. Flanged
|
PFC
|
Heat Transfer Non-Pressurized
|
Heat Transfer
Fluid/Oil
|
50-600
|
9-600
|
30.7-2,047
|
Atmospheric
|
Optional
|
150 Lb.
Welded
|
150 Lb. Flanged
|
CLD
|
Heat Transfer Pressurized
|
Heat Transfer
Fluid/Oil
|
50-750
|
9-600
|
30.7-2,047
|
150 psig
|
Standard
|
300 Lb.
Welded
|
300 Lb. Flanged
|
CLS
|
Heat Transfer Pressurized
|
Syltherm® 800
|
100-750
|
9-600
|
30.7-2,047
|
200 psig
|
Standard
|
300 Lb.
Welded
|
300 Lb. Flanged
|
OMHTS4
|
Heat Transfer Multiple Zone
|
Heat Transfer Fluid/Oil
|
50-750
|
9 -1,200
|
30.7-4,094
|
200 psig
|
Optional
|
300 Lb.
Welded
|
300 Lb. Flanged
|
CHTV
|
Heat Transfer Vaporizer
|
Dowtherm® Therminol®
|
-20-750
|
15-300
|
51.2-1,024
|
150 psig
|
Standard
|
300 Lb.
Welded
|
300 Lb. Flanged
|
1. Indicates standard design and pressure. Models available to 300°F.
2. Indicates standard design kW. Higher kW ratings available.
3. N/A indicates not available or not applicable.
4. Contact your Local Chromalox Sales office.
5. Mbh is the ASME & ANSI standard for one thousand British Thermal Units per
hour.
Other Notes — Use these selection guidelines as a reference to the availability
of Chromalox Packaged Heat Transfer and Large Tank Heater Systems. If you cannot
find a system with all of the features required for your application, contact your
Local Chromalox Sales office.
|
Oil Systems
Technical & Application Data
- Heat Transfer Fluids and Oils to 750°F
- 4-600 kW (14-2,047 Mbh) Multiple Zone and Special System Designs
to 1,200 kW or More
- 208-575V, 3 Phase, 60Hz
- Non-Pressurized (Atmospheric) and Pressurized Systems
- 150 Lb and 300 Lb Carbon Steel Construction-All Primary Loop Hydraulic
Piping Welded Schedule 40 Steel Pipe
- Long Life 0.475" Dia. Steel Sheath Elements Welded to Flanges
for Easy Service
- Positive Displacement and Centrifugal Pumps — Wide Selection
of Pump Manufacturers Available
- NEMA 1, 4 and 12 Electrical Enclosures-Explosion Resistant Class
I, Group D, Div. 1 Available
- Integral Power Panels with Mechanical Contactors or Optional Electronic
SCR Controls and Sequencers
- Broad Selection of Mechanical and Electronic Process Controls
- ASME Section VIII Certifi cation (Standard on CLD, CLS and CHTV
Systems)
- Complete Line of Expansion Tanks, Cooling Modules, Accessories
and Options
Oil System Options & Features
Special Pumps — Chromalox heat transfer systems can be built
with an installed spare pump. The pump can be the same manufacturer as the standard
or Chromalox will build the system using a pump from your preferred pump manufacturer.
The types of pumps available include centrifugal (AVS type which conforms to ANSI
standard B73.1), positive displacement, sealess (canned or magnetic drive) or turbine.
Pump manufacturers include Allis-Chalmers, Aurora, Blackmer, Brown & Sharp,
Burkes, Carver, Crane, Dean, Deming, Dickow, Dunham-Bush Fairbanks-Morris, Goulds,
Haight, Ingersoll Rand, Kontro KSB, Peerless, Roper, SiHi, Sundyne, Vican, Viking,
Weinman, Worthington.
Special Crane Chempump ® can be operated at 750˚F, one of many
op tional types of pumps available.
Standard and Special Heating and Cooling Systems — Many processes
require cooling as well as heating.
Examples are:
- The rapid cool down at the end of the process cycle for product handling
- Controlled cooling or tempering to maintain temperature due to an exothermic reaction.
Chromalox electric fluid heat transfer systems can be designed with a standard or
special cooling cycle using the same heat transfer fluid. This can be accomplished
either in an open (water system) or closed-loop cooling cycle by adding either a
water-cooled, air- cooled or refrigerated heat exchanger in the piping loop. A system
with mechanical refrigeration can be designed to operate between -20 and 750°F
(-28 and 398°C).
Switching between the heating and cooling cycles can be set up for manual, semi-automatic
or fully automatic operation. The method of switching can be as simple as manually
turning valves or as sophisticated as a programmable controller linked to a computer
or distributed process system (DPS).
Five zone ASME certified hot oil heat transfer system with remote controls emphasizes
the expertise and capabilities of the Chromalox organization to meet the requirements
of virtually any heat transfer application. The system has independent zones with
a separate pump, motor, heater, heat exchanger and cooling module for each.
Lower Cost Construction — The major advantage of using heat
transfer fluids instead of hot water or steam is the operating pressure at process
temperature. Hot oil systems are preferred over hot water or steam for temperatures
above 250°F to avoid the hazards and risks of the dangerously high pressures
required to use high-temperature steam. There are many heat transfer fluids that
operate to 650°F at atmospheric pressure. Other fluids operate to 750°F
at less than 150 psig system pressures. Compare this to steam pressures and process
temperatures in the following table.
Steam Temperature Vs. Pressure
|
Process Temperature (F°)
|
Steam Pressure (PSIA)
|
406
|
250
|
467
|
500
|
510
|
750
|
545
|
1,000
|
572
|
1,250
|
596
|
1,500
|
635
|
2,000
|
652
|
2,250
|
695
|
3,000
|
707
|
3,250
|
Note — High system pressure means costly pressure retaining
components. The low vapor pressures of heat transfer fluids simplify piping and
vessel design and allow lower cost construction.
Download the Packaged Systems Selection Guidelines