1. Going Green with Energy recovery Presented by Jagdeep Singh, General Manager

5. Indoor Air Quality (IAQ)

6. Ventilation Rates IAQ generally refers to the quality of the conducted air in an indoor environment. Other terms related to IAQ include Indoor Environmental Quality (IEQ) and " Sick Building Syndrome ". Application Ventilation Rate/person Application Ventilation Rate/person Office space Smoking Lounge Restaurants Beauty Salon Bars/Cocktail Supermarkets 20 cfm 60 cfm 20 cfm 25 cfm 30 cfm 30 cfm 20 cfm Auditorium Conference Rooms Classrooms Hospital Rooms Laboratory Operating Rooms 15cfm 20cfm 15cfm 25cfm 20cfm 30 cfm

8. Ventilation Load The "Ventilation Load Index" or VLI, is a fairly new term that is gaining popularity in our industry. It was introduced to emphasize the difference between the sensible and latent ventilation loads (in ton-hrs/cfm) of outside air introduced inside to a space neutral condition (72 degrees F/55% rh).

9. Ventilation Load Index Saving with ERV (65% eff. / 1000 cfm) Ton – Hrs / Year

10. VLI Load Profile

11. Rotary Energy Exchangers

12. Coil Energy Recovery Loop

13. Heat Pipe Heat Exchangers Fixed Plate Exchangers Thermo-siphon Heat Exchanger Fresh Air From Outside Brings fresh, outside air into the unit. The fresh air filter removes large particles of dust and dirt from incoming fresh air. Stale Air From Building Connects to the return air duct system in your home to draw stale, Indoor air into the ventilator core. Stale Air to Outside Removes the stale air from your home after the energy transfer has taken place in the high-efficiency core and exhausts it outside. Fresh Air to Building Divers fresh, filtered, conditioned air beck into your home comfort system.

14. Enthalpy Wheels The energy recovery wheel also has the additional advantage of being the only unit to deliver latent transfer efficiently. With the fresh air load patterns in India being highly latent in nature and also, that there is a need to maintain a lower humidity in the conditioned space, we shall focus on an energy recovery ventilator with enthalpy wheel. The enthalpy wheel is perfectly suited to help control humidity. In summer when the outside is hot and humid the enthalpy wheel is able to cool and dehumidify the incoming fresh air and in winter when it cold and dry outside it is able to heat and humidify.

17. Normal Installation without any Energy Recovery Supply Air Fresh Air Return Air Exhaust Air

18. Normal Installation with Energy Recovery Ventilator Supply Air Fresh Air Return Air Exhaust Air

19. APPLICATIONS Health Care – Nursing Homes, Hospitals, Clinics, Specialty Centers, Clinical Labs. etc. Entertainment – Cinema Halls, Multiplexes, Discotheques etc. Hospitality – Hotels, Restaurants, Pubs, Banquet Halls, Fast - Food centers etc. Commercial – Offices, Banks, IT complexes, Conference Halls etc. Places of assembly – Schools, Temples, Educational Instt., Supermarkets, Showrooms etc. Miscellaneous – Beauty Parlours, Gymnasiums etc.

21. Ecofresh TFA With Energy Recovery Ecofresh Treated Fresh Air Unit INSIDE

22. Incorporate Enthalpy Wheels

23. The advantages of the Air Handling Unit - Flexomix

24. You decide ….. Module-, compact - or outdoor configuration

25. Selection software

26. Technical improvements

27. Flexomix Test results for Flexomix

28. Flexomix: 0,53 Test results for Flexomix Maintain IAQ with

29. Connection system: The unique design makes it possible for the assembler to choose from two different ways of connection when he assembles the unit in the machine room. You can use both guide strip connection or bolt joints inside the unit. The guide strip connection is hidden in the aluminium profile.

30. Module system: The module system makes it possible to fit several functions in the same casing. Today’s Flexomix unit has one casing for each function. The maximal length of one module will be 2.4 m. The AHU price will off-course be considerable cheaper if you use as few modules as possible. The new module system will result in very cost effective supply Air units where several functions can be placed in the same casing. Unit functions in two levels (type rotary heat exchangers, mixing sections etc.) will have fixed casing dimensions and will not form part of the module system.

31. Sizes: Two more sizes are added to cover the flow range better. This makes it possible for you to easier select the right unit with the lowest LCC and also to calculate with a smaller unit if you wish to keep down the price. More compatiable both when the customer requires low running cost and requires a cost effective unit.

33. Standard filter: All sizes except size 060 and 100 will have filters in standard dimensions. A big advantage for customers that wish to keep their onw stock of filters.

35. Maintenance Issues: Damper made of anodised aluminium with all moving parts well protected from dirt and dust inside the damper gable. Reliable operation maintenance-free even under tough circum-stances good tightness and corrosion free. Deep folded bag filters with big filter areas and good sealings. Not necessary to change filters very often. The good tightness reassure a that the air passes the filter and clean air to the room is of high quality. Solid construction with good sealings between Supply and Exhaust air. Test has been made in U.S. and the leackage is minimal ! All data are verified and checked concerning efficiency and pressure drop !

36. Fan system possible to slide out when it time for service. Saves time and money !

37. Products for air treatment for use in the medical service and the pharmaceutical industry When air handling systems are installed in buildings where you carry on activities in the field of nursing and treatment of pharmaceuticals the demand for fresh and clean air is very high. This means that the air handling system must be designed so the hygienic aspect is satisfactory. It is above all the selection of materials and the possibility to in an easy and effective way clean the air handling system that makes the design hygienic. The expression " Air handling unit in hygienic design" means that it must be possible to in an easy and effective way clean these units' exterior and interior parts. It should be designed in a way that prevents growing of bacteria. It is also very important to design the complete unit to make it possible to inspect and clean between the different section parts like coils and heat exchangers. The components shall be easily removable; for example the fans The material used shall be resistant towards corrosion.

38. LCC Life cycle cost Energy Total cost ventilation system Running time 20 years Smart investments saves money! - Air handling with the focus on LCC - Latest technology Older technology Investment

39. INTRODUCTION TO ERV

40. WHAT IS AN ERV? An energy recovery ventilator (ERV) is a type of mechanical equipment that features a heat exchanger combined with a ventilation system for providing controlled ventilation into a building.

42. TECHNICAL SPECIFICATION & SYSTEM FLOW DIAGRAMS ERV 250 / 500 * Measured At 3 Mtrs. Distance (At 90 Degrees), When Unit Is Ducted.

43. TECHNICAL SPECIFICATION & SYSTEM FLOW DIAGRAMS ERV 850 * Measured At 3 Mtrs. Distance (At 90 Degrees), When Unit Is Ducted.

44. TECHNICAL SPECIFICATION & SYSTEM FLOW DIAGRAMS ERV 1200 / 1700 * Measured At 3 Mtrs. Distance (At 90 Degrees), When Unit Is Ducted.

46. Relative Particle Sizes Particle Size vs Molecular Size (microns vs angstroms) SMALL BACTERIA Small Dust Particle 1 angstrom one ten-billionth of a meter 1 Micron (one ten-millionth of a meter) 1.8 Microns Relative sizes of Various Materials in Angstroms Item Size (Å) Hair 15000 Bacteria 340-10000 Viruses 160 - 270 Chloroform 6.9 Toluene 6.7 Propylene 5.0 Ethanol 4.4 Methane 4.0 Ammonia 3.6 Water 2.8 Oxygen 2.8

47. APPLICATION IT OFFICE BUILDING IN CHENNAI LOCATION CHENNAI DESIGN PARAMETERS FRESH AIR REQUIREMENT 244800 CFM INSIDE CONDITIONS DBT(DF)/ RH HOURS OF WORKING/DAY 20 (Call Centre) MONSOON - 74 55+-5% SUMMER - 74 55+-5% WINTER - 74 55+-5% MONSOON - 83 80 ASSUMPTIONS SUMMER - 103 83.2 WINTER - 65 57 POWER TARIFF/KWH RS.5.5 POWER CONSUMPTION (KW/TOR) 1.1 K.W

48. MODEL SELECTED TFA –FLEXOMIX 150 x 102 TOTAL ENERGY RECOVERED WITH WHEEL (All 102 Units) SUMMER - 1296 TOR MONSOON - 1090 TOR WINTER - 1076 K.W VENTILATION LOAD INDEX (VLI) FOR CHENNAI = 38.74 Tonnes Hrs / yr Power consumption (w/o Heat Recovery wheel) = 20/24 x 300/365 x 244800 cfm x 38.74 x 5.5 x 1.1 = 392 Lakhs / Year Power consumption (with Heat Recovery wheel) = 20/24 x 300/365 x 244800 cfm x 38.74 x 5.5 x 1.1 x (1-0.805) = 76 Lakhs / Year Savings per year = 316 lakhs / year Savings for twenty years = 63.2 Crores

49. COST OF WHEEL WITH TAXES & DUTIES = 1,71,60,000/- EXTRA DUCT COST = 5, 00,000 /- NET SYSTEM COST = 1,76,60,000/- COST REDUCTION IN A/C SYSTEM DUE TO REMOVAL OF 1000 TR – 1000 X 25,000/- =RS. 2,50,00,000/- FIRST COST REDUCTION - Rs . 2,50,00, 000 – Rs. 1,76,60, 000 = Rs. 73,40,000/- PAYBACK - NEGATIVE FIRST COST SAVINGS = Rs. 73,40,000/- ,IN ADDITION ANNUAL ENERGY SAVINGS = RS. 3,16,00,000/-

50. ESTIMATED AIR - CONDITIONING LOADS S.No Description of area Occupancy F/A CFM Considered A/c Load without HRW A/c Load with HRW GROUND FLOOR 1. Anchore Store – 3 Ground Floor 205 2050 67.57 56.96 2. Lobby – Ground Floor 22 56.62 7.74 7.44 3. Shops South – Ground Floor 178 234.37 47.33 46.09 4. Atrium - Ground Floor 130 6767 67.5 31.79 5. Shops North - Ground Floor 155 1700 41.62 40.53 6 Anchor Store- 1 Ground Floor 170 670 58.57 49.6 7. Anchor Store - 2 Ground Floor 67 237 24.59 20.63 8 Business Club - Ground Floor 9 4.3 3.05 FIRST FLOOR 9. Shops South – Ist Floor 345 1025 107.33 101.92 10. Shops North – Ist Floor 351 462.15 99.94 97.5 11. Passage – Ist Floor 92 10325 94.72 40.24 12. Atrium – Ist Floor NIL 180.65 9.13 8.19 13. Anchor Store- Ist Floor 407 2845 103.82 88.81

51. SECOND FLOOR 14. Shops South – IInd Floor 345 1025 107.33 101.92 15. Shops North – IInd Floor 351 462.15 99.94 97.5 16. Passage – IInd Floor 92 10325 94.72 40.24 17. Atrium – IInd Floor NIL 180.65 9.13 8.19 18. Anchor Store- IInd Floor 407 2845 103.82 88.81 THIRD FLOOR 19. Theatres – III rd Floor 1442 21630 227.4 113.25 20. Multiplex Foyer – III rd Floor 470 9400 100.67 51.06 21. Ticket Counter – III rd Floor 100 2000 22.33 11.78 22. Food Court – III rd Floor 1000 20000 337.08 231.54 23. Hypermarket – III rd Floor 600 13800 279.2 209.82 SUB TOTAL 2115.6 1546.57 IT OFFICES(4 th TO 10 th FLOOR) 24. IT Club – IV th Floor 517 10340 165.21 110.64 25. IT Club – V th Floor 403 8060 133.72 91.18 26. IT Club – VI th Floor 403 8060 133.72 91.18 27. IT Club – VII th Floor 403 8060 133.72 91.18 28. IT Club – VIII th Floor 403 8060 138.77 96.24 29 IT Office – IX th Floor 204 4080 67.99 44.79 30. IT Office – X th Floor 204 4080 73.17 51.64 SUB TOTAL 846.3 576.85 TOTAL 9475 147245.6 2962.08 2123.44

52. OPTION I WITH DIVERSITY @ 80% in Multiplex and 85% in IT office 2411.8 1776 OR SAY 2400 TR 1780 TR SAVINGS= 636 TR INSTALLED TONNAGE = 1776 TR OPTION II PROPOSED FRESH AIR @ 20 CFM/PERSON 189500 TOTAL TONNAGE 3255.02 2186.42 WITH DIVERSITY @ 80% in Multiplex and 85% in IT office 2673 1835 OR SAY 2670 TR 1835 TR SAVINGS= 838 TR INSTALLED TONNAGE = 1835 TR

53. OPTION I (With 1,47,246 cfm of Fresh Air as per present design) Tonnage W/O Heat Recovery Wheel (HRW) = 2412 TR (With 80% diversity in Mall) & 85% diversity in IT offices Tonnage with Heat Recovery Wheel = 1776 TR (With 80% diversity in Mall) & 85% diversity in IT offices Reduction in Installed tonnage with HRW = 636 TR

54. SAVINGS (with HRW) SAVINGS IN FIRST COST Reduction in Tonnage = 636 TR Reduction in Project Cost due to capacity reduction in Chiller, pumps (CHW & CDW) piping, cooling Tower, valves, exhaust blowers etc.. = Rs. 25,000 x 636 = 1,59,00,000/- Cost of Treated Fresh air units with Heat recovery Wheels = 1,10,00,000/- Savings in first Cost = 49,00,000/- Savings in Running Cost Ventilation Load Index for Kolkata = 34.47 tonnes hrs/ cfm /year Energy Load for total fresh air of 147246 = 34.47 x 147246 tonnes hrs/year = 5075570 tonnes hrs/ year

55. Power consumption W/O Heat Recovery Wheel (for fresh air) only MALLS For 16 hrs per day for 365 days = 16 x 365 x 96506 x 34.47x 5.5 x 1.1 24 365 = 134 lacs per year IT OFFICE For 20 hrs per day for 300 days = 20 x 300 x 50740 x 34.47 x 5.5 x 1.1 24 365 = 73 lacs per year Total power consumption (for fresh air only) = 207 lacs per year

56. Power consumption with Heat Recovery Wheel (for fresh air) only MALLS For 16 hrs per day for 365 day = 16 x 365 x (1-0.75) x 96506 x 34.47x 5.5 x 1.1 24 365 = 33.5 lacs per year IT OFFICE For 20 hrs per day for 300 days= 20 x 300 x (1-0.75) x 50740 x 34.47 x 5.5 x 1.1 24 365 = 18.25 lacs per year Total power consumption (for fresh air only) with Heat recovery wheels = 51.75 lacs per year Hence Annual Savings = 155 lacs per year Total Savings for 20 years = 31 Crores of energy saving (approximate life of equipment)

57. TO SUMMARIZE . . . . . With the Indoor Air Quality (IAQ) becoming increasingly important, HVAC professionals have been on the look out for economical and good engineering solutions. Energy recovery especially enthalpy wheels have come out as a winner providing cost effective solutions to the problem even in tropical countries like India having high latent loads. Energy recovery equipment with inbuilt recovery system, supply air and exhaust air blowers, filters offer a good and complete solution and has become a standard accessory to Split, Duct able, package and central plant systems.