Overhead-Attached Heaters for Horticulture and Agriculture

The new energy-saver heating systems for the horticulture branch: Doll overhead-attached heaters type-series HR

novel type blow-out jalousie for a noticeably equal warmth-allocation in the greenhouse. Optionally available blow-out cone for application of a perforated warm-air film tube.

high energy prices are demanding efficient heating ­ systems for horticulture. By the use of the paten­t annular gap recuperator these devices are having a German TÜV- approved substantially higher system-efficiency as conventional heating systems. As with this Doll-patent the radiant heat of the combustion chamber, which otherwise turns out to be lost heat, becomes absorbed by the recuperator and is being transformed again into useful heat. 

 

 

 

 

 

 

 
  • very compact, light and aerodynamically efficient construction design. 
  • no freezing.
  • optionally for equipment with oil or gas blower burner.
  • special-combustion chamber and recuperator made out of stainless-steel.
  • low indoor pollutants and radiation radiation losses.
  • high efficiency by the usage of the revolutionary, new and also economical combustor geometry.
  • special-sickle ventilator for a smooth and silent run, with high air throughput. 
  • equal heat-allocation with no exhaust lines attached or with film tubes.
  • applicable overhead-attached, compact construction layout.
  • casing fully zinc-coated and additionally plastic-coated.
  • exhaust nozzles on the side for simple connection with the exhaust fume line.
  • very easy installation over 4 serially equipped attachment eyes.
  • easy servicing and cleaning, easy to maintain by an unproblematic access to all parts and components.
  • practical round form, versatile installation options.
  • installation possible above the cultivation area, thereby no interference with the usable surface. 
  • novel, specially design blow-out jalousie for an homogeneous heat allocation and adjustable heat-recycling down to the floor. 
  • no generation of expensive stand-by heat as like warm-water heating system-operation. 
  • compact type of construction with backside ventilation for reduction of device-limited unheated zones in the building. 
  • system stand-by and system failure optically observable via signal lamps.
  • selector switch for heating or aeration mode-
  • delivery as a complete UNIT with burner, switching board and thermostat controllers, completely built up and wired.
  • special-coating finish for minimal light absorption.


DOLL HR-type series: All in all an outmost economic, cost-effective and powerful instant-heating system for the best climate for growth in greenhouse processes!
Technical specfications:
 HR 50
 HR 80 HR 100
Electrical connector: 230 V / 50 HZ 230 V / 50 HZ                          

400 V / 50 HZ (230 V available)             
Heating power:
 up to 60 kW up to 80 kW up to 110 kW
Air throughput:
4400 m³/h 5946 m³/h 8176 m³/h
Energy supply:

heating oil

/compressed natural gas(CNG)

/liquefied petroleum gas(LPG) 

heating oil

/CNG

/LPG

heating oil

/CNG

/LPG
Exhaust-fume line diameter:
 150 mm 200 mm 200 mm
Device diameter:
780 mm 780 mm 780 mm
Entire length:
 1110 mm 1730 mm 1760 mm
Weight:
 80 kg 110 kg 135 kg