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Short answer: a Chinese solar greenhouse is a specific passive-solar design, not a general label for every greenhouse manufactured in China. It normally combines a solar-facing transparent roof, an insulated opaque wall and a movable night blanket. It can reduce heating demand in a suitable cold, sunny climate, but its orientation, section, wall, blanket, ventilation and crop layout must be designed from local weather and operating requirements.
First define which Chinese greenhouse you mean
Buyers use the phrase “Chinese greenhouse” in two different ways. One means a greenhouse product sourced from a Chinese manufacturer. That product might be a Venlo glasshouse, film tunnel, sawtooth house or another familiar type. The other means the Chinese solar greenhouse, a distinct asymmetric structure developed for protected cropping in cold regions with useful winter sunshine.
This distinction changes the RFQ. A sourcing inquiry should compare structural design, covering, systems, shipping, installation and service. A Chinese solar greenhouse inquiry must also test whether passive solar collection, heat storage and night insulation fit the site. Ask the supplier to name the proposed greenhouse type before discussing performance or price.
The classic solar form usually places the transparent growing slope toward the winter sun. An opaque rear wall and often opaque end walls reduce exposure and provide thermal mass or insulation. A movable blanket covers the transparent surface at night. The exact section is not universal. Latitude, winter solar angle, external temperature, snow, wind, crop height and available land all influence it.
Use hourly climate data, not a country label
Start with project coordinates, altitude and an hourly weather file. Winter minimum temperature matters, but so do solar radiation, cloud duration, wind, humidity, snow and the length of cold events. A design developed for a sunny continental climate should not be copied unchanged into a cloudy maritime climate or a hot, humid region.
The crop brief needs day and night air limits, root-zone needs, light requirement, humidity range, canopy height and production calendar. A leafy crop with a low canopy can use the interior volume differently from tall tomatoes. If the buyer expects year-round production, summer heat rejection can become as important as winter heat retention.
Research on Chinese solar greenhouses shows that geometry, orientation, envelope properties and thermal storage interact. The useful lesson for procurement is not a single preferred angle or wall thickness. It is that the supplier should show the inputs, calculation method and expected indoor boundary for this site.
Compare the design as a complete heat path
| Design element | What it does | Questions for the supplier | Evidence to request |
|---|---|---|---|
| Orientation and section | Collect winter solar energy while providing crop clearance | Which weather period, solar angle and crop height set the section? | Site plan, cross-section, shadow study and design-weather assumptions |
| Transparent roof | Transmits useful light and loses heat through the envelope | What covering, layers, inflation, fastening and replacement method are included? | Product data, light and thermal properties, details and service access |
| Opaque wall | Limits exposure and may store or resist heat flow | Is the wall thermal mass, insulation, or both? How is moisture managed? | Layer build-up, material properties, foundation and moisture details |
| Night blanket | Reduces night heat loss from the transparent surface | How are edges sealed, rolled, protected and interlocked with wind or precipitation? | Blanket specification, drive layout, control logic and replacement plan |
| Ventilation | Removes heat and moisture and supports summer operation | What is the net opening after screens, and what happens during rain or high wind? | Vent dimensions, screen resistance, actuators, stages and safe positions |
| Supplemental systems | Cover climate gaps that passive design cannot meet | When do heating, circulation, cooling or dehumidification start? | Load calculations, equipment duty, sensors, alarms and sequence of operation |
Orientation needs a site-specific answer
A supplier may offer a standard direction, but the project still needs a site plan. True south in the northern hemisphere is only one input. Land shape, surrounding buildings, mountains, winter shadows, access roads, drainage and prevailing wind can change the practical layout. Long rows can also create morning and afternoon differences across the crop.
Request a drawing that identifies geographic north, greenhouse axis, solar-facing roof, opaque wall, adjacent rows and the lowest winter sun condition used for shadow spacing. If several houses are planned, confirm that one wall or blanket does not shade the next growing area during critical hours.
The wall is not a generic block of mass
A thick wall is not automatically an efficient wall. Dense material can store heat, while insulation slows heat flow. Their positions, moisture condition and contact with soil affect the result. A wall that absorbs daytime heat but loses it outdoors or into wet ground may underperform the design assumption.
Ask for the full wall build-up, including interior finish, storage layer, insulation, weather protection, foundation connection, cap, drainage and penetrations. The supplier should state which materials are locally sourced and which arrive with the greenhouse package. Local building rules may assign the wall and foundation to a civil engineer rather than the greenhouse supplier.
Thermal mass also occupies space. The buyer should see the usable growing width, service aisle and equipment clearance after the wall and structural supports are shown. Compare proposals on productive layout, not only external footprint.
The night blanket needs mechanical and operating details
The blanket is central to night heat retention, yet quotations sometimes describe it with only a material name and nominal thickness. Ask how it rolls, where it stores during the day, how it seals at the ridge, eave and ends, and how operators reach it for repair. Gaps and wet insulation can change performance.
Controls need defined wind, rain, snow and temperature actions. The drive should have limit switches, overload protection, manual recovery and an accessible emergency procedure. A failed blanket position can threaten crops at night or shade them during the day, so spare parts and local response time belong in the operating plan.
Plan ventilation for winter moisture and summer heat
Closing the structure to retain heat also retains plant moisture. Condensation on the covering, wall and crop can signal that the air and surface conditions have reached the dew point. The operating plan needs circulation, measured humidity and short controlled ventilation when outside conditions permit. It should not rely on leaving the house permanently sealed.
In warm seasons, an asymmetric solar greenhouse can collect more heat than the crop can tolerate. Check roof and side vent area, actuator groups, insect-screen resistance, shade options and any fan or evaporative cooling interfaces. The supplier should state the net opening area and the control positions used for wind and rain.
Review temperature-control options and humidity-control options as part of the same sequence. If remote supervision is required, define sensors, alarms, manual override and data records through the smart control system.
Separate structure price from project cost
A low structure quotation can exclude the items that determine installed cost. Compare the same scope: survey, geotechnical information, earthworks, foundation, wall, drainage, structure, covering, blanket, vents, doors, climate equipment, electrical work, water, freight, import charges, installation, commissioning and training.
State the delivery term and destination. Long wall materials may be better sourced locally, while special drives, blankets or connectors may come from the manufacturer. Ask who checks local materials and who carries responsibility when the wall, steel and controls meet on site.
Do not accept a fixed payback or yield claim without the crop, climate, energy tariff, labor plan, market price and operating record behind it. A quotation can show capital and operating assumptions, but the buyer or an independent adviser should own the financial model.
Chinese solar greenhouse RFQ inputs
- Coordinates, altitude, site plan, true north, topography and surrounding shadows.
- Hourly winter and summer weather, including solar radiation, wind, humidity and snow.
- Crop, canopy height, spacing, production calendar and acceptable climate limits.
- Required growing area, service aisles, equipment space and expansion plan.
- Proposed orientation, cross-section, row spacing and winter shadow calculation.
- Covering, opaque wall layers, foundation interface and moisture protection.
- Night blanket material, seals, drive, interlocks, manual recovery and replacement access.
- Vent dimensions, screen resistance, shade, circulation, heating and cooling interfaces.
- Power, backup, sensors, alarms, data records and safe positions after a fault.
- Local and imported scope, freight basis, installation supervision and commissioning tests.
What should be tested before handover?
Inspect dimensions, structure, covering tension, wall interfaces, drainage, doors, vents and blanket travel. Operate every drive through its full range. Confirm limits, overloads, manual operation and controller feedback. Test temperature and humidity sensors against a reference and record their positions.
The commissioning plan should include a representative cold-night check and a warm-day ventilation check when conditions allow. Record outside weather, indoor temperature and humidity, blanket and vent positions, heating state and alarms. If weather is unsuitable at handover, define provisional tests and the later seasonal verification.
Engineering boundary: this guide does not promise a universal indoor temperature, heating saving, crop yield, service life, installed cost or payback. Final geometry, structure, thermal design and equipment capacity require project weather, crop criteria, material data, local codes and checks by the responsible structural, civil, electrical and agricultural specialists.
Related CFGET planning pages
Compare other commercial greenhouse structures when the passive-solar form does not fit the site. Review built examples in CFGET project cases, then send the site, crop, weather and responsibility matrix through the project inquiry form for a bounded quotation.
Technical references
- Scientific Reports: analysis and optimization of Chinese solar greenhouse design parameters
- Scientific Reports: review of Chinese solar greenhouse thermal performance and energy use
- Energy: review of solar greenhouse thermal storage and envelope research
Preparing a quotation request? Send the site plan, hourly weather, crop limits, preferred production months, utilities and local scope. A useful proposal can then show its design assumptions, exclusions and acceptance tests.
