Two Circuits, One Unit
The LT and HT sections share the casing, the fans and the airflow but stay hydraulically separate. One unit instead of two saves space, steel, cabling and installation work.
Two circuits in one unit
Gas engines and many large diesel engines have two cooling circuits: the high-temperature (HT) circuit for the jacket water and the low-temperature (LT) circuit for the charge air and often the lubricating oil. An LT/HT radiator cools both in one unit, with separate coil sections, headers and connections.
TECS designs LT/HT radiators to the engine manufacturer's data for each circuit, in horizontal, vertical and V-type layouts.
Request a design Send us filesDesigned To The Engine Data
Each circuit has its own heat rejection, flow rate and temperatures from the engine manufacturer. The unit is designed so that both circuits reach their temperatures together at the design ambient, within the pressure drop the engine pumps allow.
Horizontal, Vertical Or V-Type
Horizontal LT/HT radiators suit open sites and power plants, vertical units stand against a louvre or a duct, and V-type units carry large engines on a small plot.
Supplied With The Auxiliaries
Expansion tanks, level switches, junction boxes or control panels are supplied with the unit. Where the project needs it, the heating module with pumps, valves and heat exchangers completes the engine cooling circuit.
Typical Scope Of Supply
- LT and HT coil sections with separate headers and flanged connections
- Galvanised or painted casing with support legs or frame
- EC or AC axial fans with guards
- Expansion tank and level switch for each circuit where required
- Junction box or control panel
- Factory pressure test and function test
- Datasheet, dimensional drawing, fan curve, acoustic data, IOM manual
Technical Overview
- Circuits
- LT (charge air, oil) and HT (jacket water) in one unit
- Arrangement
- Horizontal, vertical or V-type
- Fans
- EC / AC axial fans, 50 or 60 Hz
- Materials
- Cu/Al, AlMg2.5, epoxy coating, galvanised or painted casing
- Options
- Expansion tanks, level switches, control panel, heating module
Questions We Are Often Asked
What do LT and HT stand for?
Low temperature and high temperature. The HT circuit cools the engine jacket; the LT circuit cools the charge air and, on many engines, the lubricating oil.
Why not two separate radiators?
Two units are possible, but one LT/HT unit needs less space, fewer fans and less installation work.
Which engines need an LT/HT radiator?
Most gas engines for power generation and CHP and many large diesel engines. The engine manufacturer's data shows which circuits must be cooled.
What do you need for a quotation?
The heat rejection, flow rate and temperatures of each circuit, the coolant and its glycol content, the design ambient temperature and altitude, the sound limit with its distance, and any space limit. An engine manufacturer's datasheet covers most of it.
Contact Us
Send us the heat duty, the fluid temperatures and flow rates, the ambient conditions and the installation limits. We answer with a design proposal - or write to us on WhatsApp.
