Air Handling units For hospital environment FM-H. Copyright FAST SpA

Transcription

1 Air Handling units For hospital environment FM-H

2 Presentation index - Health directives - Technical directives/norms - AHUs FM-H: technical details

3 Problem of Legionella The term legionellosis (legionnaire s disease) identifies forms of pulmonary infection caused by different species of aerobic bacteria of the type Legionella (Legionella pneumophila is the species most dangerous)

4 Problem of Legionella Legionella infections are difficult to distinguish from other types of pneumonia The Legionella (especially in the variant "legionnaire's disease") is a serious disease, with high lethality

5 Problem of Legionella Reference 15/12/2011:

6 Problem of Legionella

7 Responsibilites Problem of Legionella Due to recent incidents that occurred in hospitals with episodes of deaths, dedicated institute opened a criminal investigation against the directors of the hospitals on charge of negligent injury, wrongful death and violation of the law 626/94 on the protection of workers. It 'clear, however, that can potentially be called into question all those involved in the process of design, implementation, testing, maintenance, use of the system: designers, general contractors, equipment manufacturers, installers, test technician, maintainer, owner, manager. Extract from UNI communication

8 Problem of Legionella Dangerous environments All plants that pose a moderate heating of water and its spray (hospitals, nursing homes, rest, hotels, schools, spas, swimming pools,...) are potentially under the risk Especially, HOSPITALS

9 Problem of Legionella Conditions for the development of Legionella 1 Optimal temperature for growth range from 25 to 42 C (best 37 C) 2 Aerobic (ambient with oxygen) and humid environment 3 Presence of nutrients: biofilms, slag, limestone and iron ions, other microorganisms 4 Spraying water droplets forming with diameters ranging from 1 to 5 microns

10 Mode of transmission Spread by breathing contaminated water aerosols (main cause of transmission) Alcohol, Smoking Sex (men, mainly) Advanced age Problem of Legionella chronic lung disease

11 Guidelines for the protection and promotion of health in confined spaces Scope of the document To provide technical guidelines, to promote the development of initiatives... on pollution of indoor environments (IAQ)" Structure of the document Part 1: introduction Part 2: prevention for indoor environments Part 3: strategic lines for actuation of «prevention for indoor environments»

12 Guidelines for the protection and promotion of health in confined spaces Strategic lines of the risks dell'iaq (summary) Carry out a survey on the health of existing buildings Prepare guidelines for designers and constructors of buildings Prepare protocols relating to the maintenance Prepare a reference standard for the protection of health Verify the effectiveness of taken actions

13 Guidelines for the protection and promotion of health in confined spaces General guidelines in paragraph of the guidelines refer directly to the Guidelines for the prevention and control of legionellosis to ensure compliance with the hygienic requisites of indoor air, should refer to the provisions of ENV ("network of pipelines. Requirements for components to facilitate maintenance of networks of pipelines" - January 1997 ") test procedures for limits in the pipelines should follow the methodology described in the documentation prepared by NADCA - National Air Duct Cleaners Association The maintenance should be logged

14 Guidelines for the prevention and control of legionellosis Prevention strategies in plant systems (summary) prevent standing water; limit the possibility of biological niches by making periodic cleaning of equipment; maintain efficient drift eliminators and filters; avoid the critical temperature of water (25-55 C); eliminate with proper treatment the biofilm (nourishment for Legionella) provide for water treatment;

15 Guidelines for the prevention and control of legionellosis Prevention strategies in plant systems (summary) To program inspections on the installation of air conditioning to check the status of humidifiers, evaporative cooling towers, the location of the external sockets and the state of drainage systems; To check maintenance schedule and log To design the air flow system to ensure accessibility for maintenance operations;

16 Guidelines for the prevention and control of legionellosis Specifications for components (summary)

17 Guidelines for the prevention and control of legionellosis Specifications for components (summary) Silencers - Must have surface finishes such as to limit the nesting of dirt, and to ensure the ease of cleaning; - Must be placed at an appropriate distance from humidifiers; Inlet for Fresh air - must be sized for speed <2 m/s - must be fitted with guards to prevent water from entering; - should be placed away from sources of pollution;

18 Guidelines for the prevention and control of legionellosis Specifications for components (summary) Filters: - class F7 upstream of UTA; - class F8 / F9 downstream of the UTA and any silencers; - class F7 on the fresh air intake; - must be serviced (cleaning and replacement)

19 Guidelines for the prevention and control of legionellosis Specifications for components (summary) Heat exchangers: - cleaning often the heat exchanger; - Sloping the drain pans - make the pans with dedicated materials to prevent corrosion. Adiabatic humidification - Not suggested - Checking the quality of water - Cleaning often the system

20 Guidelines for the prevention and control of legionellosis Specifications for components (summary) Ducts: - Compressed air system for cleaning is suggested Logbook of maintenance - ordinary and extraordinary maintenance on water systems and air conditioning systems must be registered.

21 Norm UNI CTI 5/716 Abstract air conditioning systems must be provided of accesses for technical and hygiene inspections by qualified personnel. Each control must be registered. Inspection of tech and hygiene must involve ducts, local and technical components of the air handling unit

22 Norm UNI CTI 5/716 Allowable limits for the concentration of particulate matter and bacteria in the canals, for the test methods and limits for bacterial contamination of components in CTA refers to the technical documentation NADCA Checkings, cleaning, disinfection must be carried out according to a checklist proposed in a table training of personnel hygiene facilities must be provided: Category A: hygiene managers Category B: for simple personal

23 Guidelines ASHRAE Scope of document Giving directions to minimize the risk of Legionellosis associated with water systems, swimming pools, air conditioning systems, etc.. Abstract The guideline addresses the problem with a comprehensive approach is to identify areas characterized by higher critical plant, consider the application situations (hospitals, hotels, etc..) And propose intervention methods emphasizing the aspect of prevention to stop the rise to the chain of transmission of legionellosis.

24 Technical solutions inside FM-H Problemi di igiene - salute pubblica Strumenti giuridici e normativi Attività di ricerca e sviluppo FAST Progetto FM-H: soluzione tecnica

25 Technical solutions inside FM-H Range Modello FM-H 342 FM-H 286 FM-H 237 FM-H 194 FM-H 154 FM-H 119 FM-H 105 FM-H 82 FM-H 69 FM-H 57 FM-H 50 FM-H 42 FM-H 35 FM-H 28 FM-H 20 Velocità frontale sul pacco di scambio termico [m/s] ,5 Portata aria [m 3 /h]

26 Technical solutions inside FM-H Technical solutions inside FM-H construction (easy to clean, inspected, materials used, envelope leakage) Technical characteristics of the components of the various sections

27 Technical solutions inside FM-H Construction Cleaniness internal profile and edges with angles less than 90 C are connected Drainable floors Avoided holes, spaces

28 Technical solutions inside FM-H Construction Inspectability Access doors for every section Every section is provided with adequate lighting to facilitate cleaning

29 Technical solutions inside FM-H Technical characteristics of the components Fresh air inlet rated for speeds up to 2 m / s have effective systems (backward cowls) to prevent water or dirt from getting inside the CTA should be placed away from sources of pollution and expulsion of ambient air (instructions on the manual)

30 Technical solutions inside FM-H Technical characteristics of the components Filters Eurovent certification is agreeding on the efficient use of filters F 8-9 F7 filters will be positioned upstream of the CTA F8 / F9 filters will be located downstream of the CTA and downstream silencers F7 filters will be positioned on vents the filter section shall be equipped with optional differential pressure switch UV lamps may be installed upon request activated carbon filters may be installed upon request

31 Technical solutions inside FM-H Technical characteristics of the components Heat exchangers materials can be (tube / fins): - Cu / Cu (standard) - Cu / Cu tinned (optional) - Steel / Cu (optional) - Stainless steel / steel (optional) the casing of coils and related rails are made of stainless steel Electric coils are made of stainless steeel

32 Technical solutions inside FM-H Technical characteristics of the components Heat recovery devices PHE RAC Coils RWE is not suggested! Fresh air inlet should be filtered with F7 filter

33 Technical solutions inside FM-H Technical characteristics of the components Humidifier Only with steam the accumulation of water is prevented taking into consideration the distances from the following component. Control stops the humidifier when the air conditioning system shuts down or fails

34 Technical solutions inside FM-H Technical characteristics of the components Droplet eliminators They are expected after cooling coils with velocity> 2.6 m / s after humidification The droplet separator has fins antibacterial treatment with frame and stainless steel guides

35 Technical solutions inside FM-H Technical characteristics of the components Fan sections They are fans of the type used exclusively PLUG FAN ensuring easy cleaning of both the impeller and the floor (and media guides are minimized) The fan support and the fan itself are totally subjected to antibacterial treatment;

36 Technical solutions inside FM-H Technical characteristics of the components Silencers They are equipped with polyethylene film to ensure a high standard of hygiene, and the frame rails are stainless steel the formation of condensation thereon shall be avoided while maintaining appropriate distances between humidifiers and silencers as a function of speed and air temperature and humidity conditions silencers will be installed horizontally to facilitate easier removal

37 Technical solutions inside FM-H Technical characteristics of the components Panels 50 mm thickness panels Drainable floor for all section, at least 3% slope materials (external / internal) Galvanized steel precoated/aluminum with antibacteria treatment Aluminum/Aluminum wih antibacteria treatment Insulation: Polyurethane (standard) Mineral wool (different thickness)

38 Technical solutions inside FM-H Technical characteristics of the components Casing Aluminum Aluminum, with thermal break Base frame Galvanized steel or stainless stell

39 Technical solutions inside FM-H Coating for Aluminum Internal panels can be treated with a patented anti-bacteria painting

40 Technical solutions inside FM-H Coating for Aluminum Patent: number PD2300A00272 at CCIAA, Padova antibacterial treatment has been patented with the claim "air handling unit, particularly for environmental health and hospital food, [...] characterized in that it comprises bacteria-static to counter the emergence of bacterial colonies [...] substances with bacteria-static or bactericidal action

41 Technical solutions inside FM-H Coating for Aluminum the bactericidal action of the treatment is tested by the laboratories of the Department of Environmental Medicine and Public Hygiene of the University of Padua

42 Technical solutions inside FM-H Filters, SS casing Droplet eliminator, Antibateria treated PLUG FAN Antibacteria system for internal panels SS guides and rails

43 Indice Thanks For your attention 43