Products and Solutions

Compact Heat Exchanger Unit (CHU)

Reduce installation time, footprint, and project cost with pre-assembled, high-efficiency heat exchangers for heating and cooling systems.

The LHE Compact Heat Exchanger Unit (CHU) simplifies district heating and cooling system installation.

Each unit is built from standardized modules that integrate essential thermal and hydraulic components into one pre-assembled skid. That means less time on-site, lower labor costs, and faster project delivery without sacrificing performance.

A smarter approach to district heating and cooling

The Compact Heat Exchanger Unit combines all key thermal components — including heat exchangers, pumps, temperature control valves, and sensors — into a single, modular system.

Designed, built, and tested in our factory, each unit is customized to site conditions and customer requirements. By minimizing on-site piping and welding, we help you streamline project execution, cut construction time, and avoid rework or delays.

Why choose LHE’s Compact Heat Exchanger Unit?

Pre-engineered

Designed using proven performance models and real-world operating data.

Factory assembled and tested

Each unit undergoes full QA and performance testing before shipment.

Compact footprint

Modular layout fits tight plant rooms or underground installations with ease.

Lower installation costs

Reduced need for on-site welding, piping, and configuration.

Energy efficient

The CHU maximizes heat recovery and lowers long-term energy costs.

One supplier, one system

We deliver the entire system — with single-source responsibility from spec to service.

Centralized thermal energy delivered efficiently

District heating and cooling systems distribute thermal energy through underground pipes to residential and commercial buildings.

Hot or chilled water is produced centrally — often using CHP plants, boilers, or waste heat — and circulated to each building through insulated mains. CHUs act as localized interface units, reducing energy loss and simplifying building-level system design.

Performance matters at every connection point

In each building, the CHU replaces traditional boilers or chillers with high-efficiency plate heat exchangers — transferring heat to the secondary network for space heating and hot water.

Since thermal transfer efficiency directly impacts energy usage, system cost, and end-user satisfaction, choosing a high-performance CHU is key to sustainable and economic operation.

CHU Technical Specifications

Heating capacity	Pipe Size, Primary side	Pipe Size, Second side	Heating in-line pump, Pump quantity	Heating in-line pump, Power	TCV size
~300	50A	100A	2 or 3	2.2	32A
~400	65A	100A	2 or 3	3	32A
~500	65A	125A	2 or 3	3	40A
~600	65A	125A	2 or 3	4	40A
~700	65A	125A	2 or 3	4	50A
~800	80A	125A	2 or 3	5.5	50A
~900	80A	150A	2 or 3	5.5	65A
~1000	80A	150A	2 or 3	7.5	65A
~1100	80A	150A	2 or 3	7.5	65A

Hot water capacity	Pipe size, Primary side	Pipe size, Hot or domestic water	Pipe size, Domestic return water	Hot water in-line pump, Power	TCV size
~100	32A	40A	40A	0.55	15A
~200	50A	65A	40A	0.55	25A
~300	50A	65A	40A	0.55	32A
~400	65A	65A	40A	0.55	40A
~500	65A	80A	40A	0.55	40A
~600	65A	80A	40A	0.75	40A
~700	80A	80A	40A	0.75	50A
~800	80A	100A	50A	1.1	50A
~900	80A	100A	50A	1.1	50A

System design and technical requirements

Inlet and outlet temperature

Radiation heating: 115/55 °C (1st side) | 45/60 °C (2nd side)
Convection heating: 115/55 °C (1st side) | 50/70 °C (2nd side)
Reheating: 55/35 °C (1st side) | 75/55 °C (2nd side)
Preheating: 35/15 °C (1st side) | 55/35 °C (2nd side)

TCV standard pressure drop

TCV pressure drop: 0.3 bar

Required in-line pump head for heating

0–150 households: 18 m (low floor) / 19 m (high floor)
151–250 households: 19 m (low floor) / 21 m (high floor)
251+ households: 21 m (low floor) / 23 m (high floor)

System pressure loss by fluid type

District heating: 2.0 bar
Heating: 1.0 bar
Hot water supply: 1.0 bar

Plate Heat Exchanger (Heating)

Primary side: 0.2 bar
Secondary side: 0.3 bar

Plate Heat Exchanger (Hot Water)

Primary (reheating/preheating): 0.1 bar
Secondary (reheating/preheating): 0.08 bar

Hot water supply configuration

≤150 Mcal/h: single-stage system
150 Mcal/h: two-stage system
(50% per stage — reheating + preheating)