Longertek

Official website business segment 01: energy-saving inverter air conditioning units for rail transit vehicles, adopting full DC inverter and heat pump heating technologies, used for straddle-type/suspended monorails and high/medium-low speed maglev trains in various cities; it is the company's flagship product line that first introduced inverter heat pump technology into the vehicle air conditioning industry.

The official website does not publish model codes or a quantitative parameter table for this family; only structural technical notes are available: it adopts DC vector variable-frequency speed-regulation technology, in which the condenser fan, ventilation fan and compressor are all driven by permanent magnet synchronous motors, delivering high efficiency and stepless speed regulation with real-time adjustment of compressor speed and air volume according to load demand; it adopts fuzzy inverter control technology, performing logical operations and control according to human comfort based on parameters such as temperature, humidity, pressure, passenger flow and air volume; it adopts electronic expansion valve thermodynamic optimization, with heat pump heating absorbing heat from a low-temperature heat source (outside the carriage) and delivering it to a high-temperature heat source (inside the carriage) following the reversed Carnot cycle principle; it adopts adaptive constraint control, automatically seeking the maximum cooling or heating capacity under given ambient temperature and load parameters; it adopts DC power supply technology for rail vehicle air conditioning, with a DC input range covering DC500V-DC900V (an official quantified statement of the technology's applicable range, not a single model specification); it adopts mechatronic integration, with the air conditioning unit and control cabinet integrally assembled and internal components and electronic control modules designed modularly for simple, reliable disassembly and easy maintenance.

• Straddle-type monorail trains in various cities
• Suspended monorail trains
• High-speed maglev trains
• Medium- and low-speed maglev trains
• Urban rail transit vehicles
• Trunk railway, intercity regional railway and high-speed railway vehicles
• Overseas rail transit vehicles

Official website business segment 02: the new energy vehicle air conditioning and intelligent thermal management product line, i.e. the 'new energy vehicle air conditioning and intelligent thermal management products' listed in the company profile, corresponding to the new energy commercial vehicle air conditioning and thermal management systems in this batch baseline; the homepage describes this segment as: 'DC inverter compressor, low noise; vehicle-dedicated inverter with high reliability'.

The official website does not publish model codes or a quantitative parameter table for this family; only structural technical notes are available: it adopts a DC inverter compressor with low operating noise; it is equipped with a vehicle-dedicated inverter for high reliability; the technical base reuses the company's self-developed DC vector variable-frequency speed regulation and fuzzy inverter control technologies, with permanent magnet synchronous motors driving the condenser fan, ventilation fan and compressor to achieve stepless speed regulation and real-time adjustment of compressor speed and air volume by load; electronic expansion valve thermodynamic optimization and adaptive constraint control prevent repeated compressor start-stop; the company has obtained IATF 16949 automotive quality management system certification, suitable for automotive-grade new energy vehicle applications.

• New energy vehicle air conditioning systems
• New energy commercial vehicle air conditioning systems
• Intelligent thermal management for new energy vehicles
• Electric A/C compressors and inverter control for new energy vehicles

Official website business segment 06: the dedicated thermal control (temperature control) product line for power and energy storage equipment, corresponding to the power and energy storage temperature control equipment in this batch baseline; the homepage describes this segment as: 'suitable for 5G communication base stations, the power industry, and outdoor cabinets of environmental monitoring stations'.

The official website does not publish model codes or a quantitative parameter table for this family; only structural technical notes are available: designed for temperature control scenarios of outdoor cabinets and power equipment, suitable for 5G communication base stations, the power industry and outdoor cabinets of environmental monitoring stations; it reuses the company's self-developed inverter energy-saving and refrigeration system control technology platform; the company profile lists 'energy storage temperature control' as one of the new business segments under continuous exploration, belonging to the digital energy intelligent environmental control product system.

• 5G communication base stations
• Power industry equipment thermal control
• Outdoor cabinets of environmental monitoring stations
• Energy storage system thermal control
• Precision server rooms and digital energy intelligent environmental control

Official website business segment 07: the wind-solar-storage-charging integrated smart microgrid product line, listed as an independent site link in the business segment navigation of the longertek.com homepage. Note: during this crawl the independent site http://micro-grid.longertek.com/ returned fetch failed and was unreachable, so for this family only the homepage navigation card of the official website confirms its existence; no original website introduction or parameters could be obtained.

The homepage of the official website does not display model codes or quantitative parameters for this family, and the independent site http://micro-grid.longertek.com/ was unreachable during this crawl, so no original technical parameters from the website can be cited; per the homepage navigation positioning, this family is a smart microgrid system integrating wind power, photovoltaic power generation, energy storage and charging/discharging, consistent with the company's 'digital and intelligent energy' development direction. No third-party sources were used to supplement parameters; deriving any figures from this is strictly prohibited.

• Integrated wind-solar-storage-charging smart microgrid
• Coordination of renewable power generation and energy storage
• Energy management of charging and discharging facilities

Official website business segment 03: the heat pump based multi-cogeneration cooling and heating system product line; the homepage describes this segment as: 'multiple systems integrated in one unit; healthy, comfortable, smart and energy-saving'.

The official website does not publish model codes or a quantitative parameter table for this family; only structural technical notes are available: multiple systems integrated in one unit; heat pump heating follows the reversed Carnot cycle principle, absorbing heat from a low-temperature heat source and delivering it to a high-temperature heat source, with the heat supplied indoors equal to the heat absorbed outdoors plus the energy input by the compressor; relying on the company's self-developed DC vector variable-frequency speed regulation and fuzzy inverter control technologies, it performs logical operations and system control according to parameters such as temperature, humidity, pressure, passenger flow and air volume, being healthy, comfortable, smart and energy-saving.

• Combined cooling and heating supply for buildings and industry
• Heat pump heating
• Centralized temperature control scenarios with multi-system integration

Official website business segment 04: the air-source heat pump drying equipment product line, i.e. the 'air-source heat pump drying equipment' listed in the company profile; the segment card on the homepage carries no text description, listing only the family name and a 'learn more' entry.

The official website does not publish model codes or a quantitative parameter table for this family, nor descriptive text on the list page; per the company profile, this family belongs to the 'air-source heat pump drying equipment' of the company's main business, based on the company's self-developed inverter energy-saving core technology platform, using air-source heat pumps to replace traditional heat sources for material drying.

• Air-source heat pump drying
• Heat pump drying of agricultural products and materials
• Industrial heat pump drying

Official website business segment 05: the data center server room thermal and environmental control product line; the homepage describes this segment as: 'air-cooled inverter with high energy efficiency ratio, safe and reliable, large air volume, large-screen interface in Chinese'.

The official website does not publish model codes or a quantitative parameter table for this family; only structural technical notes are available: it adopts an air-cooled inverter solution with high energy efficiency ratio, safe and reliable; large air volume supply; equipped with a large-screen control interface in Chinese; the technical base is the company's self-developed inverter energy-saving control and refrigeration system control technologies, belonging to the 'precision server rooms' and 'digital energy intelligent environmental control products' categories in the company profile.

• Data center server room thermal control
• Precision server room environmental control
• Digital energy intelligent environmental control

A secondary product series under the rail transit air conditioning segment (/product/c1.html); the official list page names the family 'New-Type Vehicles' and gives product features: DC power supply, inverter, heat pump heating, ultra-lightweight. The series targets new-type rail vehicle platforms, adopting DC power supply and inverter heat pump heating technologies with ultra-lightweight as the design goal.

Neither the list page nor the detail pages of this series on the official website publish model codes or a quantitative technical parameter table; only the official product feature phrases are available: DC power supply, inverter, heat pump heating, ultra-lightweight. The technical base consists of the company's self-developed DC vector variable-frequency speed regulation, fuzzy inverter control, electronic expansion valve thermodynamic optimization, adaptive constraint control and rail vehicle air conditioning DC power supply technologies (the website states that a DC power input range of DC500V-DC900V can all be satisfied; this value describes the technology's applicable range, not a single model specification of this series).

• New-type rail vehicle air conditioning
• DC-powered air conditioning units for rail transit vehicles

A secondary product series under the rail transit air conditioning segment (/product/c1.html); the official list page names the family 'High-Speed/Regional Trains' and gives product features: fully independent (indigenous) design, inverter, heat pump heating, optimized air field. The series serves air conditioning of high-speed railway and intercity regional trains, emphasizing fully independent design and air field optimization.

Cooling capacity: 12 kW; Heating capacity: 10 kW; Air volume: 1500 m³/h; Voltage: 380 V AC; Refrigerant: R410A; Compressor displacement: 20 cc; Noise: 55 dB; Applicable models: High-speed rail

• High-speed railway train air conditioning
• Intercity regional train air conditioning
• Trunk railway vehicle air conditioning

A secondary product series under the rail transit air conditioning segment (/product/c1.html); the official list page names the family 'Next-Generation Vehicles' and gives product features: inverter heat pump, full DC power supply, intelligent pre-diagnosis, lightweight. The series targets next-generation rail vehicle platforms, adding intelligent pre-diagnosis and lightweight design on top of inverter heat pump and full DC power supply.

Cooling capacity: 12 kW; Heating capacity: 10 kW; Air volume: 1500 m³/h; Voltage: 380 V AC; Refrigerant: R410A; Compressor displacement: 20 cc; Noise: 55 dB; Applicable models: High-speed rail

• Next-generation rail transit vehicle air conditioning
• Intelligent thermal management pre-diagnosis for rail vehicles

A secondary product series under the rail transit air conditioning segment (/product/c1.html); the official list page names the family 'Trams' and gives product features: inverter, direct DC supply, heat pump heating. The series serves tram air conditioning, adopting inverter control, direct-DC cooling and heating, and heat pump heating solutions.

Neither the list page nor the detail pages of this series on the official website publish model codes or a quantitative technical parameter table; only the official product feature phrases are available: inverter, direct DC supply, heat pump heating. The direct DC supply scheme corresponds to the website's 'rail vehicle air conditioning DC power supply technology' (a DC power input range of DC500V-DC900V can all be satisfied; this value describes the technology's applicable range, not a single model specification of this series).

• Tram air conditioning
• Urban rail transit vehicle air conditioning

A pure electric bus air conditioner series under the new energy equipment segment (/product/c2.html). The official list page names the family 'Pure Electric Bus Air Conditioner D Series' with the note: heat pump heats normally above -15℃, suitable for North China and regions south of it, solving low-temperature heating.

The list page of this series on the official website does not publish model codes or a specification parameter table; the only quantified statement, from the website's original text, is: heat pump heats normally above -15℃. The technical principles reuse the company's self-developed DC inverter compressor and vehicle-dedicated inverter platform.

• Pure electric bus air conditioning
• Low-temperature heating for new energy coaches in North China and regions south of it
• New energy commercial vehicle air conditioning systems

A pure electric bus air conditioner series under the new energy equipment segment (/product/c2.html). The official list page names the family 'Pure Electric Bus Air Conditioner UT Series' with the note: heat pump heats normally above -25℃, suitable for cold northern regions, solving ultra-low-temperature heating.

The list page of this series on the official website does not publish model codes or a specification parameter table; the only quantified statement, from the website's original text, is: heat pump heats normally above -25℃. It is the company's ultra-low-temperature heat pump heating solution for cold northern regions, with technical principles reusing the company's self-developed DC inverter and electronic expansion valve thermodynamic optimization technology platform.

• Pure electric bus air conditioning
• Ultra-low-temperature heating for new energy coaches in cold northern regions
• New energy commercial vehicle air conditioning systems

A pure electric bus air conditioner series under the new energy equipment segment (/product/c2.html). The official list page names the family 'Pure Electric Bus Air Conditioner B Series (DB, UTB)' with the note: integrated battery cooling air conditioner, weight reduction and energy saving, offered in integrated DB Series and UTB Series configurations.

The list page of this series on the official website does not publish a quantitative specification parameter table; the series codes given in the website's original text are the DB Series and UTB Series, with the product feature 'integrated battery cooling air conditioner, weight reduction and energy saving, offered in integrated DB Series and UTB Series configurations', i.e. battery cooling integrated on top of coach air conditioning, reducing curb weight and energy consumption through integrated configuration.

• Pure electric bus air conditioning
• Battery cooling for new energy coaches
• New energy coaches with integrated battery cooling air conditioning

A pure electric bus air conditioner series under the new energy equipment segment (/product/c2.html). The official list page names the family 'Pure Electric Bus Air Conditioner S Series' with the note: integrates the vehicle-level comprehensive thermal management system, achieving energy recovery and utilization and reducing overall vehicle energy consumption (comprehensively managing battery, motor, electronic control and passenger cabin heating).

The list page of this series on the official website does not publish model codes or a quantitative specification parameter table; the product feature in the website's original text is 'integrates the vehicle-level comprehensive thermal management system, achieving energy recovery and utilization and reducing overall vehicle energy consumption', with the managed objects being battery, motor, electronic control and passenger cabin heating, i.e. a vehicle-level integrated comprehensive thermal management solution.

• Vehicle-level comprehensive thermal management for pure electric buses
• Battery thermal management for new energy coaches
• Motor and electronic control thermal management for new energy coaches
• Passenger cabin heating for new energy coaches

A secondary product series under the new energy equipment segment (/product/c2.html); the official detail page is titled 'Battery Thermal Management System', with the product introduction: applicable vehicles: thermal management systems for batteries and motor/electronic control of new energy vehicles. The page also lists application directions as bullets: industrial machine tools; battery cooling; liquid cooling equipment for new energy vehicles and more.

The official detail page has only four sections ('Product Introduction', 'Application Fields', 'Product Features', 'Technical Parameters'); the body does not publish model codes or a quantitative technical parameter table, and the technical parameters section shows no visible values; the citable original text comprises the applicable object 'thermal management systems for batteries and motor/electronic control of new energy vehicles' and the liquid cooling application directions 'industrial machine tools, battery cooling, liquid cooling equipment for new energy vehicles and more', indicating this family is a liquid-cooled battery and motor/electronic control thermal management system. No model or number was fabricated.

• Battery thermal management for new energy vehicles
• Motor and electronic control thermal management for new energy vehicles
• Battery cooling
• Liquid cooling equipment for new energy vehicles and more
• Industrial machine tool cooling

A secondary product series under the new energy equipment segment (/product/c2.html); the official detail page is titled 'Air Conditioners for Commercial & Heavy Trucks', with the product introduction: applicable vehicles: logistics vehicles, specialty vehicles, construction machinery vehicles, light trucks.

The official detail page has only four sections ('Product Introduction', 'Application Fields', 'Product Features', 'Technical Parameters'); the body does not publish model codes or a quantitative technical parameter table, and the technical parameters section shows no visible values; the citable original text comprises the applicable vehicles 'logistics vehicles, specialty vehicles, construction machinery vehicles, light trucks' and the application fields 'commercial vehicles, heavy trucks, special vehicles, logistics vehicles and others'. The technical base is the company's self-developed DC inverter compressor and vehicle-dedicated inverter platform. No model or number was fabricated.

• Commercial vehicle air conditioning
• Heavy truck air conditioning
• Special vehicle air conditioning
• Logistics vehicle air conditioning
• Specialty and construction machinery vehicle air conditioning
• Light truck air conditioning

A product series under the new energy equipment segment (/product/c2.html, the same semantic subpage group as the battery thermal management system and the commercial & heavy truck air conditioners); the family name comes from the official URL naming of the product's standalone page. Because the list page of the 'New Energy Equipment' segment only shows 4 pure electric bus air conditioner series due to pagination, this family was not flatly listed and no official Chinese family name or body text was obtained; per the official English URL naming it is translated as 'Conventional Hybrid Coach Air Conditioner'. It is an in-sale product page on the company website, not a discontinued product.

Due to the list page pagination limits and the WebFetch attempt cap, the body of this family's page was not obtained, and the official website did not publish this family's model codes or quantitative technical parameters on the crawled pages; it can only be confirmed that this family is an in-sale product series within the website's product center, with a standalone page and official URL naming, corresponding to air conditioning for conventional hybrid coaches. No model, number or parameter was fabricated.

• Conventional hybrid coach air conditioning
• New energy commercial vehicle air conditioning systems

A product series under the heat pump multi-cogeneration segment (/product/c3.html); the family name comes from the official URL naming of the product's standalone page. Because the list page of the 'Heat Pump Multi-Cogeneration' segment only shows 4 entries due to pagination, this family was not flatly listed and no official Chinese family name or body text was obtained; per the official English URL naming it corresponds to the 'Full DC Inverter Multi-Cogeneration Unit', a core unit-type product of the heat pump multi-cogeneration segment, not a discontinued product.

Due to the list page pagination limits and the WebFetch attempt cap, the body of this family's page was not obtained, and the official website did not publish this family's model codes or quantitative technical parameters on the crawled pages; it can only be confirmed that this family is an in-sale product series within the website's product center, with a standalone page and official URL naming, corresponding to a full DC inverter multi-cogeneration unit (multiple systems integrated in one unit). No model, number or parameter was fabricated.

• Heat pump multi-cogeneration combined cooling and heating supply
• Centralized temperature control for buildings and industry

A secondary product series under the heat pump multi-cogeneration segment (/product/c3.html); the official list page names the family 'All-Stainless-Steel Duct Machine' with the note: all-stainless-steel structure, especially suitable for coastal or humid southern regions.

Duct size: 500×300 mm; Power: 2.2 kW; Voltage: 380 V AC; Noise: 70 dB; Weight: 150 kg; Operating temp: -10 ℃ ~ +50 ℃

• Indoor units of heat pump multi-cogeneration systems in coastal regions
• Air conditioning air supply in humid southern regions
• Air conditioning terminals in corrosive environments

A secondary product series under the heat pump multi-cogeneration segment (/product/c3.html); the official list page names the family 'Hydraulic Module' with the note: efficient heat exchange, easy and quick installation.

Rated power: 5 kW; Voltage: 380 V AC; Flow rate: 20 L/min; Pressure: 6 bar; Operating temp: -10 ℃ ~ +50 ℃; Protection class: IP65

• Water-circuit integration of heat pump multi-cogeneration systems
• Water systems for combined cooling and heating supply of buildings

A secondary product series under the heat pump multi-cogeneration segment (/product/c3.html); the official list page names the family 'Heat Storage Tank' with the note: summer heat recovery system, free hot water, improved cooling efficiency.

Tank volume: 200 L; Operating temp: 5 ℃ ~ +80 ℃; Material: Stainless steel; Pressure: 0.6 MPa; Weight: 40 kg

• Summer condensation heat recovery for hot water
• Heat storage of heat pump multi-cogeneration systems
• Domestic hot water for buildings

A secondary product series under the heat pump multi-cogeneration segment (/product/c3.html); the official list page names the family 'Multi-Filtration Fresh Air Fan' with the note: primary filter, electrostatic, IFD, HEPA, activated carbon.

Air volume: 500 m³/h; Filtration efficiency: 95%; Power: 200 W; Voltage: 220 V AC; Noise: 40 dB; Operating temp: -10 ℃ ~ +50 ℃

• Fresh air purification for buildings and industry
• Fresh air terminals of heat pump multi-cogeneration systems
• Multi-stage indoor air filtration

A product series under the rail transit air conditioning segment (/product/c1.html); the family name comes from the official URL naming of the product's standalone page. Because the list page of the 'Rail Transit Air Conditioning' segment only shows 4 entries (New-Type Vehicles, High-Speed/Regional Trains, Next-Generation Vehicles, Trams) due to pagination, this family was not flatly listed and no official Chinese family name or body text was obtained; per the official English URL naming it corresponds to 'Metro' vehicle air conditioning, an in-sale product series.

Due to the list page pagination limits and the WebFetch attempt cap, the body of this family's page was not obtained, and the official website did not publish this family's model codes or quantitative technical parameters on the crawled pages; it can only be confirmed that this family is a product series within the website's product center, with a standalone page and official URL naming, corresponding to metro vehicle air conditioning, whose technical principles belong to the energy-saving inverter heat pump air conditioning system for rail vehicles. No model, number or parameter was fabricated.

• Metro vehicle air conditioning
• Urban rail transit vehicle air conditioning

A product series under the rail transit air conditioning segment (/product/c1.html); the family name comes from the official URL naming of the product's standalone page. Because the list page of the 'Rail Transit Air Conditioning' segment only shows 4 entries due to pagination, this family was not flatly listed and no official Chinese family name or body text was obtained; per the official English URL naming it corresponds to 'Main-Line Coach' vehicle air conditioning, an in-sale product series.

Due to the list page pagination limits and the WebFetch attempt cap, the body of this family's page was not obtained, and the official website did not publish this family's model codes or quantitative technical parameters on the crawled pages; it can only be confirmed that this family is a product series within the website's product center, with a standalone page and official URL naming, corresponding to air conditioning for national main-line railway coaches, whose technical principles belong to the energy-saving inverter heat pump air conditioning system for rail vehicles. No model, number or parameter was fabricated.

• National main-line railway coach air conditioning
• Railway vehicle air conditioning