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Statement from Hoare Lea Consulting Engineers on Biomass Plantroom
100 INTRODUCTION 200 MECHANICAL SERVICES 210 Above Ground Drainage 220 Domestic Hot and Cold Water 230 Low Temperature Hot Water Heating 240 Ventilation 300 ELECTRICAL SERVICES 310 Central Plant Room Electrical Services 320 Lighting 330 Street Lighting 340 Door Access System 350 TV Aerial Installation 360 Fire Alarm Requirements
Project 4 will be a further development to the currently ongoing Project 3. The Project 4 development will incorporate a new stand alone boiler house to house the woodchip biomass boiler and associated plant. This boiler shall be connected into the Phase 3 systems to allow them to take advantage of this new locally produced fuel, and for the Project 3 plant to assist with the heat loads at peak times and provide a back up facility in the event of the Biomass boiler not being operational. The proposed boiler will comply with suitable European standards and will be selected to comply fully with appropriate and / or desirable emissions standards for a residential area. It should be noted that Biomass boilers burn highly efficiently, producing minimal amounts of smoke, and include a cyclonic flue ash removal system The proposed fuel for the Biomass boiler will be supplied by the Department of the Environment, Forestry and Agriculture from plantation trees which were planted in the 1960's and 1970's. No waste timber will be burned in the proposed Biomass boiler. It is proposed that the Biomass boiler house is supplied by a specialist under a design, fabricate and erect service but based on the design proposals incorporated in the Planning Application.
Above ground drainage will be installed internally to all the sanitary appliances. Soil and waste pipework will be uPVC Plastic and will be taken to vent tiles at roof level for venting purposes.
The hot water and cold water systems shall be designed to accord with Health and Safety statutory legislation for the prevention of Legionella. The proposed dwellings will be served by domestic hot water flow (and return) pipework shall be routed around the site in underground pre-insulated pipework to serve all the dwellings. Each dwelling will also be served by an individual mains cold water supply (un-metered). The cold water system shall be insulated where required and designed with minimum dead legs. The proposed hot water system will derive its heat from the heating system buffer vessel within the new boiler house via a constant temperature circuit heating the domestic water within an indirect cylinder.
The new development shall be served by underfloor heating which will derive its heat from the new boiler house. This boiler house will contain one large biomass boiler, fuelled by wood chip. The secondary (backup/top-up) boilers will be fuelled by gas and located in the Project 3 boiler house. The wood chip boiler will, after completion of Project 4, be the lead heating boiler and be sized to suit the general heating requirements for both Project 4 and the Project 3 dwellings ( 33 units in total) The wood chip shall be stored in a fuel store located within the new boiler house. Deliveries (a maximum of one per week during the winter) are likely to be by tipper lorry and the site plan has been developed on that basis. It is currently proposed that the woodchip will be blown into the fuel store utilising a purpose designed mobile blower unit in a controlled manner. The method of delivery will also incorporate measures to limit the escape of dust. The wood chip shall be conveyed to the boiler via a rotating arm and augers (Archimedes screw). The new boiler will supply LTHW to the thermal store/buffer vessel. This heat store will allow the wood chip boiler to run for longer periods at high heat output, to store excess heat, to assist with heat loads at high demand periods. This stored heat shall be used for the buildings hot water supplies and heating requirements. The Project 4 buildings shall be served by a community heating mains, which shall connect to a heating manifold in each residence, to serve the proposed underfloor heating.
240 Ventilation Mechanical ventilation will be provided to all dwellings in compliance with current Building Regulations in the Isle of Man.
300 ELECTRICAL SERVICES The proposed dwellings will be served by a number of wired systems including electrical Power, Lighting, External Lighting, Door Access System, TV Aerial Installation, Satellite TV installation, Fire Alarm System, Telephone System and Landlords Lighting Installation and Fire Alarm System.
310 Central Plant Room Electrical Services All electrical services will be metered and distributed from a central location sited within the perimeter of the proposed Biomass boiler house. Cables for individual tenant supplies and landlord's supplies will be distributed around the site in underground ducts and will enter the building at pre-determined underground positions.
320 Lighting Artificial lighting within dwellings will be as required by the Applicant and the Department's current Housing Standards Policy Document. The lighting within shared entrance areas will be designed to meet the functional requirements of these areas, but also provide additional visual amenity on the street frontage after dark.
330 Street Lighting Street lighting proposals for the whole development will be developed by the Manx Electricity Authority on behalf of the Lighting Authority for the area, Malew Parish Commissioners.
340 Door Access System A Door Access system shall be provided to each apartment block entrance door. This system will allow visitors to make intercom calls to individual dwellings, and will allow tenants to open each main entrance door remotely to provide visitor access.
350 TV Aerial Installation A TV Aerial installation shall be provided to each dwelling, comprising a digital aerial system and a satellite aerial system.
360 Fire Alarm Requirements A fire detection and alarm system will be installed in each dwelling and to the shared entrances of each block of Apartments. The Fire Alarm System shall comply fully with the requirements of Building Control and the Isle of Man Fire Brigade Fire Regulations for Flats.
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