Mystery of Sustainable Heat Exchange Material Heat Recovery Ventilator(HRV)

Transcription

1 Mystery of Sustainable Heat Exchange Material Heat Recovery Ventilator(HRV) 1

2 Contents Why Heat Recovery Ventilator(HRV) is required Type of Heat Recovery Ventilator Feature of MITSUBISHI ELECTRIC Lossnay Lossnay Core history / development and future 2

3 Contents Why Heat Recovery Ventilator(HRV) is required Type of Heat Recovery Ventilator Feature of MITSUBISHI ELECTRIC Lossnay Lossnay Core history / development and future 3

4 Why Heat Recovery Ventilator is required IAQ has become one of the most important topics on a worldwide level. * IAQ = Indoor Air Quality Today many people spend most of the time indoor (Office / factory worker, shop retailer, etc.,). - Bad IAQ reduces comfort. - Bad IAQ affects health and well-being. - Bad IAQ makes people feel lethargic and tired. - Bad IAQ may result sick building syndrome / allergic reaction / substance sensitivity risks 4

5 Why Heat Recovery Ventilator is required Sick building syndrome 4/Mar/2003 Asahi newspaper 24/Jan/2003 Asahi newspaper 5

6 Why Heat Recovery Ventilator is required Sick building syndrome 29/May/2013 The Sun 19/Mar/2013 Oriental Daily 6

7 CO2 Concentration (x1000ppm) CO2 Concentration (x1000ppm) Why Heat Recovery Ventilator is required Example: Madison Public School in the U.S. Without Ventilator CLASSROOM With Ventilator CLASSROOM Ventilator turned off 1,000 ppm CO2 LIMIT 1,000ppm CO2 LIMIT School Hours School Hours HOURS HOURS -The ventilator manages to keep the CO2 level under 1,000ppm High CO2 concentration may cause fatigue and affect your ability to concentrate. 7

8 Why Heat Recovery Ventilator is required Example: Office Building Air-conditioner Stale Air Heat Energy Ventilator or window Fresh Air Mechanical ventilation is important, however, it is waste of energy because it exhausts air-conditioned air... What is the solution.? Aha! HRV is! 8

9 Why Heat Recovery Ventilator is required Example: Office Building Air-conditioner Fresh Air Heat Energy Stale Air HRV!! Stale Air Heat Energy Fresh Air HRV Recovers Energy! (Temp. and Humidity)! 9

10 Why Heat Recovery Ventilator is required Cooling load example in summer Type of Load Indoor infiltration load Indoor generated load Outdoor air load Heat from walls Heat from glass -from direct sunlight -from conduction & convection Accumulated heat load in walls Generated heat from people -Sensible heat -Latent heat Generated heat from electrical equipment (lighting etc.) -Sensible heat Sensible heat Latent heat Estimated Load [W/m 2 ] Total Outdoor air load 53.0W/m2 33.8% Indoor generated load 56.4W/m2 35.9% Indoor infiltration load 47.6W/m2 30.3% Energy loss caused by ventilation Conditions Outdoor air: DB 33 C, RH 63% Indoor air: DB 26 C, RH 50% Ventilation volume: 25m3 /Hr/person Middle floor of a general office building facing south 10

11 Why Heat Recovery Ventilator is required Lossnay principle Supply fan Lossnay Core (Heat Recovery unit) Exhaust fan SA (Supply Air) [Supply air goes out] EA (Exhaust Air) [Exhaust air goes out] RA (Return Air) [Exhaust air intake] OA (Outdoor Air) [Outdoor air intake] 11

12 Why Heat Recovery Ventilator is required OA (Outside air) EA (Exhaust air) Exhaust fan 2 of Lossnay cores Damper Filters Maintenance cover Supply fan Control box (circuit board) SA (Supply air) 12

13 Contents Why Heat Recovery Ventilator(HRV) is required Type of Heat Recovery Ventilator Feature of MITSUBISHI ELECTRIC Lossnay Lossnay Core history / development and future 13

14 Type of HRV Static type Exhaust Supply Rotary type Supply Indoor Outdoor Indoor Outdoor Exhaust Type Method Material Static Conductive transmission Metal/ plastic/ Paper Rotary Heat / Humidity accumulation Metal/ plastic/ Paper Heat pipe Heat / Humidity accumulation - Rotary and Static type is majority in HRV MITSUBISHI ELECTRIC is the origin of the static type enthalpy recovery core 14

15 Type of HRV Static type Construction & Principle Indoor Outdoor Partition Plate Spacer Plate General materials for core -Aluminum -Copper -Plastic/ polymer -Paper MITSUBISI ELECTRIC 15

16 Type of HRV Rotary type Construction & Principle Rotor - A layered honeycomb structure made of paper applied moisture absorbent material. Exhaust Air Fresh air is purged at a purge sector to prevent air leakage from exhaust air to fresh air. Fresh Air Purge Sector Heat and humidity of fresh air is absorbed by the rotor and as the rotor is rotating, it moves into the exhaust air and discharged to outdoor. (In summer case) Exhaust air and fresh air go through the same passage. Drive Motor Rotor rotates by a drive motor. (8rpm) 16

17 Type of HRV Air leakage and Bacteria return is a problem of Rotary Return Air Exhaust Air Purged Air Bacteria returned! Fresh Air Supply Outdoor Fresh Air Lower ventilation rate than actual performance of blowers. Strong possibility of bacteria return! 17

18 Type of HRV Item Static-type Lossnay Wheel type Construction Static transmission type. As the supply air and exhaust air pass through different passage, the air passages are completely separated. Heat and humidity accumulation type. Supply air and exhaust air flow into the same air passage because of its rotarytype construction. Moving parts None: Fixed core Used (rotor driven with belt by gear motor) Rotor core(8rpm). Air leakage Gas transmission Bacteria Gas transmission (Ammonia 2.8%) Gas transmission (Ammonia: 45-57%) Low (As air intake/exhaust are separate, transmission is low. High (As air intake/exhaust are the same, transmission is high) Space, size Core size and pressure drop become very big for large air volume unit. Difficult to arrange rotary core inside small size HRV. 18

19 Contents Why Heat Recovery Ventilator(HRV) is required Type of Heat Recovery Ventilator Feature of MITSUBISHI ELECTRIC Lossnay Lossnay Core history / development and future 19

20 Feature of MITSUBISHI ELECTRIC Lossnay Mitsubishi Electric Lossnay Core = Enthalpy Recovery Indoor Outdoor Enthalpy= Sensible Heat (Temp.) + Latent Heat (Humidity) -Sensible Heat => Heat conduction by temp. difference -Latent Heat => Vapor transition by vapor pressure difference 20

21 Feature of MITSUBISHI ELECTRIC Lossnay Heat Recovery Calculation [Summer example] Supply Air Lossnay (Enthalpy Recovery) Sensible HRV General Fan Exhaust Air D.B. ( C) Model: LGH-100RVX-E A.H. (g/kg) R.H. (%) Enthalpy(kJ/kg) Sensible efficiency: 76% Enthalpy eff. (cooling): 71% Ventilation rate : 1,000m3/h Recovered heat (kw) Outdoor air load (kw) OA load ratio (%) Outdoor Air Indoor Air DB: 33 C DB: 26 C AH: 20.1g/kg (DA) Air Conditioner AH: RH: 10.5g/kg (DA) 50% RH: Enthalpy: 63% 84.6kJ/kg (DA) Enthalpy: 52.9kJ/kg (DA) 21

22 Absolute Humidity (g/kg (DA)) Feature of MITSUBISHI ELECTRIC Lossnay Heat Recovery Calculation [Summer example] Relative Humidity (%) Outdoor air load 100% 71% Recovered by Lossnay Supply of Sensible HR 29% Outdoor 20.1 Psychrometric Chart Supply Exhaust Return(Indoor) Dry Bulb Temperature [ o C]

23 Feature of MITSUBISHI ELECTRIC Lossnay Type of MITSUBISHI ELECTRIC HRV Ceiling suspended -Air volume is m3/h -Ducting for 4 paths -Can be concealed behind the ceiling Cassette -Air volume is m3/h -Ducting for 2 paths -Panel is exposed under the ceiling (Sold only in Japan) 23

24 Feature of MITSUBISHI ELECTRIC Lossnay Type of MITSUBISHI ELECTRIC HRV Wall mounted - Mainly residential use - 100m3/h - Install on the wall like air conditioner s indoor unit - Supply and exhaust air through 2 hole on the wall 24

25 Feature of MITSUBISHI ELECTRIC Lossnay Type of MITSUBISHI ELECTRIC HRV Ceiling suspended with humidifier and DX coil - Air volume is 500 and 1000m3/h - Supplemental heating / cooling by using with MTSUBISHI ELECTRIC air conditioning system - Connecting to water pipe for humidifying 25

26 Feature of MITSUBISHI ELECTRIC Lossnay Type of MITSUBISHI ELECTRIC HRV Floor standing - Outdoor installation possible (Applied models only) - Air volume m3/h - Humidifier model, heating / cooling model existing 26

27 Feature of MITSUBISHI ELECTRIC Lossnay Type of MITSUBISHI ELECTRIC HRV Hong Kong school model - Strong fire proof construction - Ceiling suspended (Not concealed) 27

28 Contents Why Heat Recovery Ventilator(HRV) is required Feature of MITSUBISHI ELECTRIC Lossnay Type of Heat Recovery Ventilator Lossnay Core history / development and future 28

29 Lossnay Core history / development and future 1943 Nakatsugawa Works is Established 1945 Began manufacturing electric fans 1968 Began manufacturing duct fans First in Japan! 1970 Began marketing the Static enthalpy HRV Major innovation in dramatically decreasing the amount of energy wasted from conventional building ventilation! World s First! Original Lossnay Unit 29

30 Lossnay Core history / development and future The invention of Lossnay In 1969, Mr. Masataka Yoshino invented the principle of Lossnay. 30

31 Lossnay Core history / development and future The trigger of invention 31

32 Lossnay Core history / development and future Humidity transfers, and also gasses that are easily dissolved in water such as CO2, NO2 transfers. Ordinary Paper Higher humid air Water Vapor CO2 NO2 The contaminants passes through the plates during ventilation and returns to the room. Specially Treated Paper (Made of Cellulose Fibers) *for the former series Humidity transfers, but gasses such as CO2, NO2 do not transfer. Water Vapor Higher humid air CO2 Water Vapor NO2 CO2 Lower humid air NO2 Most of the contaminants do not return to the room during ventilation. Hyper Eco Core (Made of Specially Treated Cellulose Membrane) *For the Current Series More humidity transfers while the amount of gasses go through the plate decrease. Higher humid air Water Vapor Lower humid air Gas(CO2) Molecule The amount of air returning to the room decreases to less than 1%*, and the total heat exchange performance has been improved by the change of material. (*Tested by Mitsubishi Electric) Water Molecule Lower humid air 32

33 Lossnay Core history / development and future Hyper Eco Core <New adhesive> Our Patent Hyper Core Hyper Eco Core 33

34 Lossnay Core history / development and future Core future development for better energy recovery For better humidity efficiency + Absorbent material (Volume, selection) + Spacer Plate (Thinner plate) For better Temperature efficiency + Try to new construction of Air stream (Changing partition plate shape and material.) 34

35 Lossnay for school in Hong Kong Total over 20,000 units are installed. Lossnay units are supporting to Hong Kong Children s Education. 35

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