The new chapters 7 and 8 have been added to report KD 551 in which aerodynamic characteristics are given for rectangular flat plates with different aspect ratios. Chapter 7 is called: “Determination of the moment coefficient Cmh around a point H for a square plate”. Chapter 8 is called: “Determination of the moment coefficient Cmh around a point H for an aspect ratio 1 : 5”. This information is important if a vane is rotating around an axis which is lying behind the airfoil nose. This axis should not be taken too far from the airfoil nose other wise the vane becomes instable.
A new chapter 8 “Experiments with Chinese axial flux generators of Hefei Top Grand” has been added to report KD 341: “Development of the permanent magnet (PM) generators of the VIRYA windmills”.
Report KD 707 has been added at the menu KD-reports. The title of this report is: “Replacement of the original radial flux PM-generator of the VIRYA-4.2 by the axial flux PM-generator of Hefei Top Grand type TGET380-10KW-1200R for 48 V battery charging”.
Drawings of the VIRYA-4.2 windmill are no longer available. The main goal of writing this report KD 707 is not to introduce a new VIRYA design but to find the procedure how the Pmech-n and Pel-n curves for a 48 V battery load can be estimated from the specification of the manufacturer. Making this knowledge available, is the reason why this report is made public.
Report KD 705 has been added at the menu KD-reports. The tittle of this report is: “Ideas about the use of the 3-bladed VIRYA-3B3 rotor (lambda design = 6.5) in combination with the axial flux generator of Hefei Top Grand type TGET320-1KW-350R”. The main goal of this report is not to present a new VIRYA windmill but to explain how the specification of the supplier of a certain PM-generator can be transformed into the wanted Pmech-n and Pel-n curves of the generator. The characteristics of the VIRYA-3B3 rotor have been used as an example to check the matching and to derive the Pel-V curve.
Report KD 704 has been added at the menu KD-reports. The tittle of this report is: “Ideas about a piston pump with a floating valve for the VIRYA-3.6L2 windmill for irrigation of farmland from a river or a lake”.
The first windmill which was equipped with a pump with a floating valve is the CWD 2000 which was tested in the period 1989-1990 at the Eindhoven University of Technology. The output was much higher than for a normal piston pump with the same starting wind speed. The idea of a piston pump with a floating valve for the bigger VIRYA-3.6L2 windmill is especially of interest for irrigation as large flows are needed for this purpose.
Report KD 703 has been added at the menu KD-reports. The tittle of this report is: “Ideas about a 4-bucket Savonious rotor called the VIRYA-1.45 for driving a positive displacement pump”. A photo of a scale model of the rotor scale 1 : 5 is given on the front page of this report.
Report KD 702 can be copied for free at the menu KD-reports. The tittle of this report is: “Ideas about the 8-bladed rotor of the VIRYA-0.54 windmill (lambda design = 1.25, pentagonal aluminium blades) coupled to a Nexus hub dynamo for 12 V battery charging”.
The VIRYA-0.54 is a very simple and light windmill without a head and a safety system which is placed on top of a bamboo pole. The rotor is turned in the wind by manually turning of the bamboo pole.
Het artikel “Woningbouw in de kerkdorpen van Sint-Oedenrode” werd opgenomen onder het menu “no wind energy”. Dit artikel is verschenen in de Mooi Rooi Krant van 12-8-2020.
De notitie “Ideeën over een levensloopbestendig vrijstaand huis dat geschikt is voor dubbele bewoning” werd op 5-8-2020 vervangen door de notitie: Ideeën over een vierkant levensloopbestendig vrijstaand huis geschikt voor dubbele bewoning”. De nieuwe notitie werd geplaatst onder het menu “no wind energy”. Het huis van de nieuwe notitie heeft twee gescheiden ingangen en een diepte van 11 m i.p.v. 10 m. Het heeft ook een diepere trap naar de zolder. Het idee mag door iedereen gratis gebruikt worden.
Report KD 699 has been added at the menu KD-reports. The tittle of this report is: “Calculations executed for the 3-bladed rotor of the VIRYA-4.4 windmill (lambda design = 5.25, stainless steel blades) using a 34-pole PM-generator for coupling to a centrifugal pump with a 1.1 kW asynchronous motor”. The 34-pole PM-generator is described in report KD 614.