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

1st Internal Diameter(*SPPS380)	1st Heating Load for Convection (Mcal/hr)	1st Heating Load for Radiant (Mcal/hr)	2nd Flow Rate for *SPPS380(LPM)	2nd Flow Rate for **STS(LPM)
15A	17.1	18.6	4.1	3.6
20A	38.4	41.6	8.9	8.3
25A	71.1	77	16.4	17.6
32A	144.7	156.7	34	36.5
40A	214	232	50.7	54.5
50A	413	447	93.9	105.6
65A	788	854	185.6	208.8
80A	1 249	1 353	282.2	326.4
100A	2 516	2 726	559.5	661.2
125A	4 433	4 803	970.4	1 160
150A	6 996	7 580	1 543	1 840
200A	14 479	15 686	3 148	3 846
250A	26 026	28 195	5 553	6 834
300A	41 981	45 480	8 832	10 950
350A	56 621	61 340	11 796	14 724

Hot Water

1st Internal Diameter(*SPPS380)	1st Heating Load(Mcal/hr)	1st Flow Rate(m3/hr)	Hot Water Load for **STS(Mcal/hr)
15A	11.6	0.2	8.7
20A	25.6	0.6	19.8
25A	47	1.1	42.1
32A	96	2.4	87.5
40A	143	3.5	130.8
50A	275	6.8	253.5
65A	526	13.1	501.1
80A	833	20.8	783.4
100A	1 678	41.9	1 587
125A	2 956	73.8	2 784
150A	4 665	116.6	4 416
200A	9 653	241.3	9 232
250A	17 351	433.7	16 402
300A	27 988	699.7	26 280
350A	37 748	943.7	35 338

* SPPS380 refers to carbon steel pipes for pressure service, as defined in KS D 3507.
** STS refers to stainless steel pipes for piping use, as defined in KS D 3576.

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

Design Pressure (kgf/cm²)	Test Pressure (kgf/cm²)
10	15
16	24
20	30

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): 0.15 bar

Hot water supply configuration

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