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Summary of Contents for Hoval A 60
- Page 1 Rotary heat exchangers for Heat Recovery in Ventilation Systems Handbook for Design, Installation and Operation...
- Page 2 Drive motor Storage mass The 3-phase gear motor with belt pulley Hoval supplies the storage mass in three types of and v-belt is installed on a rocker in material: for condensation, enthalpy and sorption the corner of the casing. The speed wheels.
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Page 3: Table Of Contents
4.8 Coated casing 4.9 Offset wheel position 5 Dimensions of the exchangers ___ 15 6 Unit type reference ____________ 16 7 System design ________________ 18 7.1 Hoval CASER design program 7.2 Design data 7.3 Local conditions, installation position 7.4 Wheel type 7.5 Performance control 7.6 Using and setting the purge sector 7.7 Mixing of the air streams... -
Page 4: Principle And Operation
Principle and Operation 1 Principle and Operation Hoval rotary heat exchangers are regenerators with rotating heat accumulators (category 3) in accordance with the guide- lines for heat recovery (e.g. VDI 2071). The heat-dissipating and heat-absorbing air flows heat or cool the rotating, air-permeable storage accumulator. - Page 5 Principle and Operation Warm air entry Mid warm air Warm air exit The rotation of the storage mass has The wheel duct now has passed half of The wheel duct is now shortly before entry moved the wheel duct from the cold air its time in the warm air.
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Page 6: Humidity Transmission
Principle and Operation 1.2 Humidity transmission The following must be noted: ■ The greater the condensation potential the greater the In addition to heat, humidity can also be transported with volume of condensate that can be expected at the warm rotary heat exchangers. -
Page 7: Leakage Of Rotary Heat Exchangers
Principle and Operation 1.3 Leakage of rotary heat exchangers There are 3 different designs: Condensation wheel Rotary heat exchangers transfer heat and humidity via a The storage mass consists of smooth, untreated aluminium, rotating storage mass that alternates between the exhaust which only transmits humidity if condensation occurs on the air and supply air flows. -
Page 8: Frost Limit
1.5 Temperature efficiency 1.8 Hygiene Appropriate design and serial layout allows virtually any Hoval rotary heat exchangers with high tightness seal have temperature efficiency to be reached. The 'correct' temper- been tested for conformity with hygiene requirements at the ature efficiency depends on the applicable regulations and Institute for Air Hygiene in Berlin. -
Page 9: Reliable Data
Therefore, regulation of the output of the Hoval rotary heat exchanger is not necessary if the extract air temperature is identical to the setpoint temperature. In this case, the fresh air is always either heated or cooled in the direction of the set temperature by the heat exchanger. -
Page 10: Structure
Structure 3 Structure A functional rotary heat exchanger consists of the wheel, the casing and the drive. 3.1 Wheel Storage mass A corrugated and a smooth metal foil are wound together as the storage mass. This forms triangular, axial ducts. The Fig. -
Page 11: Casing
Structure 3.2 Casing Casing types Different types of casing are also available for adaptation to There are different casing designs, depending on the wheel different installation situations (see also Section 4 'Options'): diameter and whether the wheel is 1-piece or segmented. ■... -
Page 12: Peripheral Slide Seal
In the profile casing a ring seal with externally accessible casing. Because manufacturers of ventilation units and double springs is used. They press the seal to the casing installers sometimes install their own drive, Hoval offers this and to the wheel. component as an option. -
Page 13: Options
■ Drive A The motor speed and therefore the performance of the rotary heat exchanger can be controlled. A control unit (option R) is required. Motor designation A 60 A 250 A 370 A 750 Motor power 0.06 0.25 0.37... -
Page 14: Control Unit
Options 4.2 Control unit Installation Caution Structure All work for transport, installation and commissioning A frequency converter with a modular design is used as the as well as maintenance is conducted by qualified control unit; it can adjust the speed of three-phase motors technicians (note IEC 364 and VENELEC HD 384 or infinitely. - Page 15 Options R/370 (Type: F-D 370-WT VECTOR IP54) R/750 (Type: F-D 750-WT VECTOR IP54) +10 V reference voltage Analogue setpoint input GND (analogue) Analogue output +15 V (max. 100 mA) Start clockwise External sensor Priority speed Parameter set switching Release GND (digital) Relay output 1 (normally open contact) Relay output 1 (changeover contact) Relay output 1 (normally closed contact)
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Page 16: Operating Unit
4.7 Duct design The speed of rotation of the wheel can be monitored with an The side walls of the casings in Hoval rotary heat inductive sensor. Stoppages, e.g. caused by a broken v-belt, exchangers with ducts are enclosed. This makes them suit- can be detected quickly and the cause can be corrected. -
Page 17: Dimensions Of The Exchangers
Dimensions of the exchangers 5 Dimensions of the exchangers The minimum size of the casing depends on the wheel diam- eter. The external dimensions can be individually adjusted. Casing dimensions min. max. Casing dimensions min. max. Dimension A Ø + 80 1350 Dimension A Ø... -
Page 18: Unit Type Reference
Unit type reference 6 Unit type reference A V - A 1 - 0600 / 1.4 / A0680B0680 / S001 / A1 , RN , B , D , SR , I3 , K , AX1234BX1234 Air flow Case A, B, C or D Installation position Vertical to 20% inclination Horizontal... - Page 19 Unit type reference A V - A 1 - 0600 / 1.4 / A0680B0680 / S001 / A1 , RN , B , D , SR , I3 , K , AX1234BX1234 Drive Without drive Drive controllable Drive for constant speed of rotation (direct drive from mains power) 1…3 Specifies the position Control unit Without control unit...
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Page 20: System Design
Fresh air flowrate stream Fresh air temperature [°C] The Hoval CASER design program is available for fast Fresh air rel. humidity and accurate design of Hoval rotary heat exchangers (= Computer Aided Selection of Energy Recovery). It runs Table 9: Design data... -
Page 21: Performance Control
To avoid deterioration of the temper- ature efficiency the purge sector must not be too large. The size of the purge sector in Hoval rotary heat exchangers can be individually adjusted to reduce the energy loss to a minimum. -
Page 22: Mixing Of The Air Streams
Clear statements can with a minimum speed of rotation. only be made on the basis of experience. The Hoval applica- tion consulting service can also provide information. Notice The high tightness seal in Hoval rotary exchangers 7.12 Condensation in the warm air stream... -
Page 23: Transport And Installation
Fig. 21: Drill area Ensure that the wheel is not drilled or blocked and the sealings are not damaged during installation. ■ Hoval rotary heat exchangers are designed for vertical installation (max. tilt 20°). Notice Rotary heat exchangers for horizontal installation are available on request. -
Page 24: Electrical Installation
To ensure correct function the ments, ensure that the wheel rotates smoothly and is not installation supervision by a Hoval technician or an author- blocked. The drive torques listed in Table 1 must not be ised supplied is recommended. -
Page 25: Specification Texts
Self-supporting construction of aluzinc sheet steel, suit- force springs (Hoval high tightness seal) reduces internal able for installation in ventilation units. The automatically leakage to a minimum. A lip seal is used as the transverse adjusted, abrasion-resistant slide seal with constant- seal. -
Page 26: Sorption Wheel
The automatically adjusted, abrasion-resistant slide seal with constant- force springs (Hoval high tightness seal) reduces internal leakage to a minimum. A lip seal is used as the transverse seal. The motor for the wheel drive can be installed in the casing. - Page 28 International Hoval Aktiengesellschaft Austrasse 70 The Hoval brand is internationally known as one of the leading suppliers of indoor 9490 Vaduz, Liechtenstein climate control solutions. More than 65 years of experience have given us the nec- Tel. +423 399 24 00...
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