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Summary of Contents for FlaktWoods ECONOVENT – PUM
- Page 1 ® ECONOVENT – PUM Rotary heat exchanger Technical Handbook...
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Page 2: Table Of Contents
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK CONTENTS Design ..........Design –... -
Page 3: Design
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Design The ECONOVENT unit is a regenerative heat Reduced cooling power demand (hygroscopic rotors) exchanger comprising a rotor which transfers heat and which reduces the size and thus also the investment moisture from the exhaust air to the supply air as it cost for the refrigeration system (compressor, cooling rotates. - Page 4 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Design General Casing for sizes 265–500 The heat exchanger consists of a casing, a rotor of hygro- The casing is of single-skin design and is delivered split, scopic or non-hygroscopic type, and a rotor drive unit. as shown in Fig.
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Page 5: Design - Description - Accessories
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Design - Description - Accessories Drive system Rotor material The drive system consists of an electric motor (constant ALUMINUM ROTORS (A, C and E rotors) are non- speed or variable speed) with reduction gear, driving the hygroscopic, i.e. - Page 6 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Design - Description - Accessories Accessories PUMZ-17 Duct connection frames Slip joint connection, made of galvanized sheet metal and fitted to the heat exchanger at the factory. PUMZ-20 Speed detector Used for continuous monitoring of the rotor speed, with automatic alarm if the rotor should stop when heat recov- ery is needed.
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Page 7: The Process In The Psychrometric Chart
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK The process in the psychrometric chart Chart 1 Non-hygroscopic rotors - type A, C and E In type A, C and E NON-HYGROSCOPIC rotors, only sensible heat exchange takes place as long as there is no condensation in the rotor. - Page 8 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK The Process in the psychrometric chart Chart 2 Hygroscopic rotors - type B, D and F In type B, D and F HYGROSCOPIC ROTORS, the moisture and temperature efficiencies at full speed are equal.
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Page 9: The Process In The Psychrometric Chart 7
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK The Process in the psychrometric chart Summer operation Excess water will occur in the hygroscopic rotor as soon Charts 1 and 2 show summer conditions in which the out- as the interconnecting line between the inlet conditions for the two air streams intersects the saturation line in the door air is warmer and more humid than the exhaust air. -
Page 10: The Process In The Psychrometric Chart 7
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK The process in the psychrometric chart Chart 3 Frosting in a hygroscopic rotor Fläkt Woods 3099 US 03.02 Specifications are subject to alteration without notice... - Page 11 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK The process in the psychrometric chart Chart 4 Frosting in a non-hygroscopic rotor Fläkt Woods 3099 US 03.02 Specifications are subject to alteration without notice...
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Page 12: Rotor Selection
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Rotor selection Selection of the rotor material to suit the application. Take great care to select the right material for every envi- ronment. If in doubt, consult Munters International. Key to markings = Satisfactory = Not recommended = Rätt val Right choice... -
Page 13: Selection Of Heat Exchanger Type And Size
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Selection of heat exchanger type and size Selection of heat exchanger For a non-hygroscopic rotor (A, C and E rotor): The temperature efficiency can be obtained from the de- No moisture transfer required sign chart on page 16. -
Page 14: Efficiency
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Efficiency For a hygroscopic rotor (B, D and F rotor): t 4 , x 4 , h 4 t 3 , x 3 , h 3 The temperature efficiency for a given rotor size and a given supply air flow is obtained from the design chart on page 16. -
Page 15: Design Chart
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Design chart Chart 4 200 000 100 000 150 000 100 000 50 000 40 000 30 000 50 000 40 000 20 000 30 000 Selected size 20 000 10 000 15 000 The area marked 10 000 The area marked... -
Page 16: Project Design Advice
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Project design advice Leakage flow rates and fan sizing Purging sector – carry-over flow Leakage between the supply and exhaust air sides cannot The purging sector is located on the supply air outlet be entirely eliminated in a rotary heat exchanger. -
Page 17: Installation
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Project design advice Symbols used: Location of the fan Rotor pressure drop on the supply air side, Question: Is air recirculation permissible? ∆p 1-2 , inches.WG If air is recirculated, the fans can be located in any posi- Pressure differential across the purging sector, tion. - Page 18 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Project design advice Filters Experience has shown that the ECONOVENT rotor is very insensitive to clogging during operation, in spite of the dense structure of passages. This is due to the fact that the direction of air flow through the rotor is contin- Room ually reversing, which has an excellent self-cleaning effect.
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Page 19: Control Systems
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Control Systems Project design advice If the air is admitted at an angle to the rotor face Control of rotary heat exchangers In systems in which the air impinges on the rotor face at Either on/off or continuously variable control can be em- an angle as shown in Fig. - Page 20 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Control Example 2. Heating and cooling energy recovery Example 4. Speed detector The temperature sensor 5 maintains the exhaust air Variable speed: The speed detector monitors the rotor temperature or room temperature constant via the con- speed.
- Page 21 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Control Example 7. Purging operation Example 5. Frosting monitor Purging operation should be employed when the heat Variable speed: The frosting monitor is used for indicat- exchanger rotor is stationary for an extended period of ing frosting in the rotor at very low outdoor temperatures time in an environment in which the supply or exhaust and high humidity of the exhaust air.
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Page 22: Installation
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Installation Rotary heat exchangers can be supplied for installation in The heat exchanger should rest on a flat supporting sur- air handling units, in the ducting or in a plant room. All face. If other components, such as a duct or unit section, variants and sizes can be installed either horizontally or are connected to the top of the heat exchanger, they vertically. - Page 23 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Installation Fig. 25 Connection to other unit sections A rotary heat exchanger with casing is best connected to the air handling unit or the ducting by means of slip clamps. The slip-clamp system should be fitted by the unit manufacturer or installation contractor to suit the connection openings on the unit or ducts.
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Page 24: Dimensions And Weights
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Dimensions and weights All dimensions in inches Weight, Lbs. Standard Wider Standard foil Size foil foil spacing Size 060 - 240 spacing spacing industrial version 37.8 23.6 – – 43.3 31.5 – – D dia. - Page 25 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Dimensions and weights - Accessories All dimensions in inches Alarm relay PUMZ-20-2-1 Duct connection frame PUMZ-17-bbb-2-0 Type for slip joint ø 3,3 0.13 29,6 0.13 Speed detector PUMZ-20-b-c Magnet Magnet Differential thermostat PUMZ-21 Size PG / joint -bbb-...
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Page 26: Ordering Key
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Ordering key ECONOVENT PUM(A-F)-a-bbb-cc-d-e-1 Installation alternatives Rotary heat exchanger Code d = Rotor material A = non-hygroscopic aluminium B = hygroscopic aluminium C = edge-reinforced, non-hygroscopic aluminium D = edge-reinforced, hygroscopic aluminium E = epoxy-coated aluminium (for a = 1, 2, 5 och 6) F = composite (for a = 2 and bbb ≤... - Page 27 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Orderingkey - Accessories Duct connection frame PUMZ-17-bbb-2-d Cleaning equipment PUMZ-27-bbb-1 (ECONOMATIC 95) Size (bbb) Size (bbb) 060 215 060 170 320 080 240 080 190 350 095 265 095 200 380 110 290 110 215 420 120 320 120 240 460...
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Page 28: Sample Specification
PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Sample Specification ECONOVENT Rotary Heat Exchanger type PUM(A-F), manufactured by Fläkt Woods, distributed by MUNTERS INTERNATIONAL, INC.. The Manufacturer shall be ISO 9001 certified. WHEEL (rotor) - The wheel shall be made of layers of corrugated and alterna- ting flat composite material or aluminum foil of uniform width to ensure a smooth surface. - Page 29 PUMA (A–F) Rotary heat exchanger TECHNICAL HANDBOOK Sample Specification CASING - The casing shall be constructed as a single-skin, self-supporting, galvanized sheet steel structure and include rotary wheel support beams and a purging sector. The casing shall be supplied with access panels to facilitate inspection and service.
- Page 30 Fläkt Woods AB, SE–551 84 Jönköping MUNTERS INTERNATIONAL Inc. 1064 Town and River Dr. Ft. Myers, FL 33919 USA +46 (0)36–19 30 00 +46 (0)3619 36 20 Telephone: 239-540-0006 www.flaktwoods.com Fax: 239-481-3566 info@muntersinternational.com www.muntersinternational.com...
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