Product Overview

Greenhouse heating functions as a hydronic application rather than a conventional room-heating application. The heat pump generates hot water, while the greenhouse heating circuit distributes thermal energy through pipes, coils, or alternative heat emitters. This separation allows the heat source and heat distribution system to be engineered independently according to crop requirements, greenhouse structures, and local climate conditions.

The system integrates available solar PV power to offset a portion of the electrical demand required by the heat pump. AC grid input provides supplementary power when solar generation remains insufficient, depending on the configured electrical setup. This operational framework suits commercial greenhouse projects with substantial heating demands and daytime solar availability.

Key Technical Specifications

Specification	Model LSQS66R2/BP-CP	Model LSQS75R2/BP-CP	Model LSQS150R2/BP-CP	Model LSQS190R2/BP-CP
AC Power Supply	380 V, 50/60 Hz	380 V, 50/60 Hz	380 V, 50/60 Hz	380 V, 50/60 Hz
Maximum AC Input Power	23 kW	26 kW	48 kW	52 kW
Maximum AC Input Current	35 A	40 A	73 A	79 A
Solar DC Input Range	200–560 V	200–560 V	200–560 V	200–560 V
Recommended PV Power	22 kW	24 kW	40 kW	48 kW
Rated Heating Capacity	75.5 kW	86.1 kW	143.3 kW	172.5 kW
Rated Heating Capacity (Btu/h)	258,135 Btu/h	294,376 Btu/h	489,943 Btu/h	589,778 Btu/h
Rated Heating COP	3.65	3.52	3.57	3.51
Rated Cooling Capacity	53.3 kW	58.5 kW	100 kW	115 kW
Compressor Type	EVI DC Inverter	EVI DC Inverter	EVI DC Inverter	EVI DC Inverter
Refrigerant	R410/R32	R410/R32	R410/R32	R410/R32
Compressor Quantity	2	2	4	4
Water Flow Rate	13 m³/h	14.8 m³/h	24.6 m³/h	29.7 m³/h
Water Pressure Drop	≤35 kPa	≤35 kPa	≤38 kPa	≤50 kPa
Water Connection	DN50	DN50	DN65	DN80
Outdoor Unit Dimensions	1990 × 900 × 1780 mm	1990 × 900 × 1780 mm	2250 × 1180 × 2300 mm	2250 × 1180 × 2300 mm
Outdoor Unit Weight	690 kg	720 kg	1050 kg	1100 kg
Noise Level	≤71 dB	≤71 dB	≤73 dB	≤73 dB

Application Areas

01/

Commercial Greenhouses: Large-scale vegetable, fruit, and flower cultivation facilities.

02/

Nursery Greenhouses: Stable hydronic temperature control for seedlings and young plants.

03/

Flower Cultivation: Frost protection and minimum temperature maintenance during winter months.

04/

Vegetable Production: Year-round or shoulder-season climate regulation.

05/

Root-Zone Heating: Low-temperature water supply for under-bench and floor circuits.

06/

Agricultural Research Facilities: Precision-controlled thermal environments for experimental growing spaces.

How the System Works

Solar PV → Heat Pump → Hot Water → Hydronic Heating Loop → Greenhouse

Solar Power Input: PV modules supply direct current (DC) power within the specified solar input range of the heat pump.

Heat Pump Operation: The EVI DC inverter compressor adjusts output dynamically based on heating demands and ambient conditions.

Heat Transfer to Water: Thermal energy from the refrigerant circuit transfers to the water circuit via the water-side heat exchanger.

Hot-Water Distribution: Heated water circulates through the greenhouse hydronic heating network.

Greenhouse Heat Release: Heating pipes, under-bench circuits, floor systems, radiators, or heating coils transfer thermal energy into the growing environment.

Supplementary Grid Power: Alternating current (AC) power supplements the system during periods of low solar generation according to the selected configuration.

Manufacturing and Quality Control

Commercial HVAC production relies on standardized testing protocols and inspection checkpoints:

Refrigeration circuit assembly and brazing verification
Heat exchanger pressure testing
Electrical wiring and component inspection
Refrigerant circuit pressure and leak testing
Electrical safety and insulation testing

Water-side pressure containment checks
Controller, inverter, and sensor calibration
Compressor performance evaluation
Fan and motor operational testing
Complete unit functional testing prior to dispatch

Defrosting & Cold-Climate Reliability

Operating heat pumps in cold-weather agricultural environments requires strict attention to frost management:

Intelligent Defrost Logic: Control systems monitor ambient conditions, coil temperatures, and run times to initiate rapid, automated defrost cycles only when required.

Drainage Management: Base pan designs and integrated heating elements prevent ice accumulation and ensure proper condensate drainage during freezing temperatures.

Low-Ambient Heating Stability: EVI technology maintains stable refrigerant mass flow and discharge temperatures even when outdoor air drops below freezing.

Certifications & Compliance

Commercial HVAC installations deployed across international markets must align with regional safety and performance standards. Equipment engineering supports compliance with:

Electrical safety directives for high-voltage commercial machinery

Pressure equipment structural integrity standards

Environmental and refrigerant regulations regarding charge limits and leak containment

Custom documentation packages available for regional engineering review and project permitting

Greenhouse Heating System Configuration

A typical installation layout follows this structural sequence:

PV Array → Solar DC Input / Electrical System → Solar-Assisted Heat Pump → Buffer Tank → Primary Circulation Pump → Hydronic Distribution Header → Greenhouse Heating Circuits → Return Water

Secondary components may include secondary circulation pumps, mixing valves, zone valves, temperature sensors, flow meters, expansion tanks, air separators, water filtration units, safety valves, control cabinets, and remote monitoring interfaces.

Installation Considerations

Outdoor equipment placement requires unhindered airflow, secure foundations, and adequate service access. Engineering plans must address:

Outdoor unit clearance zones and air discharge paths
Condensate drainage management
Snow and ice accumulation prevention

Hydraulic pipe insulation thickness
Electrical protection enclosures
Acoustic considerations for noise-sensitive boundaries
Water quality management and freeze protection mechanisms

FAQ

Q: Can a solar heat pump be used for greenhouse heating?

A: Yes. A heat pump can supply hot water to greenhouse hydronic heating circuits such as under-bench pipes, floor heating, perimeter pipes, and heating coils.

Q: Does the system need grid electricity?

A: Commercial models utilize both solar DC input and AC grid input. Grid power supplements solar generation when required, depending on the system configuration.

Q: Can the heat pump work at night?

A: Yes, provided an available electrical power source is connected. Since solar generation is absent at night, system configurations must incorporate grid power or a corresponding backup energy source.

Q: What water temperature can the system provide?

A: Required output water temperatures depend on selected models and operational needs. Commercial greenhouse projects must be sized according to required hydronic supply temperatures and actual site operating conditions.

Q: How do I select the correct heat pump capacity?

A: Calculations must begin with the greenhouse heating load at local winter design conditions, cross-referencing heat pump capacity charts at required outdoor and supply-water temperatures.

Q: Can one heat pump heat a large greenhouse?

A: Sizing depends on the calculated thermal load. Larger projects utilize multiple units in staged configurations to expand total capacity and enhance partial-load operational flexibility.

Q: Can the heat pump connect to an existing hydronic heating system?

A: Yes, subject to hydraulic compatibility between the heat pump and the existing network. Water temperature, flow rate, pressure drop, pipe sizing, and pump head must be verified prior to connection.

Q: What PV capacity is required?

A: Required PV capacity varies by heat pump model and target solar contribution ratios. Published commercial models designate recommended PV power from approximately 22 kW to 48 kW per unit.

Q: Is this a complete greenhouse heating system?

A: The heat pump acts as the core thermal generator. Complete greenhouse hydronic systems also require buffer tanks, circulation pumps, control valves, piping networks, expansion vessels, and heat emitters engineered specifically for the project.

Q: Can you recommend a model based on greenhouse size?

A: While floor area offers a general reference, accurate sizing requires local winter design temperatures, greenhouse construction materials, target indoor temperatures, cover layers, and hydronic specifications.

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Solar Heat Pump For Greenhouse Hydronic Heating