● Public buildings
● Commercial buildings
● Office buildings
● Large venues
● Comprehensive building
● Industrial plan
Working principle
Liquid circulation heat exchanger is liquid to air heat exchanger, heat exchangers installed in both fresh air side and exhaust air side, and the heat is transferred to the fresh air or exhaust air through liquid circulation, so as to preheat or pre-cool the fresh air. This sensible heat recovery is called liquid circulation heat recovery. Normally the liquid is water but in order to decrease the freezing point, moderate ethylene glycol will be added into the water according to reasonable percentage. It is also known as ethylene glycol heat recovery.
Application
The liquid circulation heat exchanger is mainly used in the air conditioning system where the fresh air and exhaust air system are dispersed or the fresh air and exhaust air are not allowed to contact directly.
Holtop HJK series Combined Air Handling Unit integrates the heat recovery core technology, and uses advanced technology to create the case structure that fully meets European standard performance. Rich function combination and all-round humanized design bring extraordinary experience to users.
● Delicate Section Design of AHU Case |
● Superior Mechanical Strength |
● Excellent Sealing |
Holtop offers 61 standard AHU case sections to meet various air volume needs, with customized designs to ensure performance and compact size—saving cost and space. The design also adapts to varying supply and exhaust air ratios for different applications.
The 1.5mm T6 aluminum frame with nylon connectors ensures stability even for large units. HJK series units meet EN1886 D1 grade, with maximum deflection <4mm/m, as verified by a certified lab.
The embedded panel-frame structure allows easy maintenance while ensuring low air leakage. Polymer seals and carefully sealed doors and pipe passages guarantee excellent airtightness, meeting national air purification standards.
FAN SECTION
● FILTER SECTION |
● COOLING & HEATING COIL + HUMIDIFIER SECTION |
● FAN SECTION |
● ROTARY HEAT RECOVERY SECTION |
FAN SECTION
Primary Filter |
Medium Filter |
HEPA Filter |
Electrostatic Filter |
Activated Carbon Filter |
G2-G4 |
F5-F9 |
H13-H14 |
The filter generates plasma under high pressure |
Strong adsorption capacity |
According to the requirements of air volume and static pressure value, one or more fans can be selected. The optional fans include direct-driven centrifugal fans, forward/backward centrifugal fans, plug fans, EC fans, etc. The fan impeller and belt pulley are corrected by static and dynamic balance, and the whole fan is corrected by running vibration, so that the operation is stable and reliable. The base of the fan and the motor is equipped with shock absorbers, the air outlet is designed according to the aerodynamic performance and has a soft connection with the case to effectively reduce the transmission of vibration.
● Direct-driven centrifugal fan |
● Belt driven DIDW forward / backward centrifugal |
● Plug fan |
● EC fan |
COOLING & HEATING COIL + HUMIDIFIER SECTION
|
The cooling coil and heating coils of HJK series units adopt the structure of copper pipes and aluminum fins, through a special expanding technology for complete jointing, which greatly improves the heat exchange efficiency of the coils. |
HUMIDIFIER SECTION
● Wet membrane humidifier |
● High Pressure Spray Humidifier |
● Double Vapor Humidifier |
Copyright © 2025 by Beijing Holtop Air Conditioning Co., Ltd - Privacy Policy
EN
