TENDER - MM.pdf

TENDER FOR INSTALLATION OF THERMO-TECHNICAL SYSTEMS FOR

HEATING, COOLING AND VENTILATION FOR IV. GRAMMAR SCHOOL

„MARKO MARULIĆ“ AND V. GRAMMAR SCHOOL „VLADIMIR NADZOR“

The master design of mechanical thermo-technical installations for the installation of heat pumps with appertaining internal units must be made according to the Rules on simple and other buildings and works (OG 112/17, 34/18, 36/19, 98/19 and 31/20) for Highs Schools

- IV. and V. Grammar School in Split. Construction-architectural basis (drawings) shall be provided by the Contractor.

For the purpose of execution - deliver to the place of insertion, install and commission the system of central heat pumps for heating and cooling of all premises ( classrooms, offices, library, admission office, meeting halls, laboratories), and for the sports hall - provide d the system of ventilation with heat recovery function tz= - 4°C project temperature (winter) ζ = 88 % relative humidity (winter) tz= 34°C project temperature (summer) ζ = 46 % relative humidity (summer) The installed system of heat pump must fulfil the requirements prescribed by Croatian national educational standards for high school education and training (OG 63/2008, OG 90/2010) Internal project parameters (internal temperatures) in heated premises:

Name of the premise Temperature Rel.humidity

Classrooms 20°C / Laboratories 18 - 20°C / Offices 20°C / Admission office 20°C / Library 20°C / Dressing rooms 20 - 22°C / Hall 16 - 18°C / Corridor 18°C / Sanitary facilities 18°C / Storages 10°C /

Internal project parameters (internal temperatures) in cooled (air-conditioned ) areas:

Name of the premise Temperature Rel.humidity

Classrooms 26°C / Laboratories 26°C / Offices 26°C / Admission office 25°C /

Provide for PVRT system of heat pump, which must operate autonomously and independently from existing heating system.

The system must be equipped with all most advanced management systems, in order to fulfil the highest energy efficiency standards, like possibility to change temperature of the evaporation of working agent, operation in compliance with parameters of temperature, and according to humidity of the premises, both - internal and external, and must provide for minimal consumption of electric power at partial load.

Seasonal efficiency of the system in winter period (SCOP) ≥ 4,90 Seasonal efficiency of the system in summer period (SEER) ≥ 8,00

External units must have vertical exhaust and frequency driven compressor, with anti-corrosion protection on heat exchange units.

Heat pumps must operate with environmentally friendly freons.

Operational range of heat pumps:

- Heating at external temperature from – 25[°C] to +18 [°C]

- Cooling at external temperature from – 15[°C] to +48 [°C]

Heat pumps operate from 50 to 130% of engaged capacity.

Heat pumps systems must have the possibility to upgrade the system if the schools start with the extension of their premises..

The noise created by external units at the planned location must fulfil the provisions of the Rules on maximum permitetd noise level considering the type of source of noise, time and place of the meeting (OG 143/2021).

External units shall be located in the courtyards or on the roof at the south-west part of the school facility.

Internal units with direct expansion shall be selected according to the possibilities for installation (check the possibility of the installation to the ceiling, i.e. whether the construction elements can bear certain type of internal unit)

All the parts of the copper piping of the distribution of the working agent must be carried on the appropriate pipe fastening collars or on galvanised steel routes (so called cable routes), all suspended on threaded bars on attested supporting girders ( like Hilti, Mupro or Wurth)

Freon distribution outside of the facility shall be carried by the shortest route to the heat pumps, and thereby the insulation must be protected from the impact of sun and mechanical damages.

Installation of the system of centrral management which provides for the possibility:

- To switch the operating mode system (heating and cooling)

- To switch on and switch off single internal units

Central operational control unit shall be placedat the premises of the school housekeeper.

Single operational control units for premises, providing for the possibility of locking and restriction of selection of temperature range.

Evacuate the condensate from internal units to the nearest drainage of sanitary facilities or to the rainwater drainage.

When connecting the condesnate's drainage of internal air-conditioning units to the drainage of sanitary facilities, it is mandatory to execute the syphon, which allows the cleaning and water replenishment The price shall include:

- Dismantling of existing split -system of air conditioning

- Storage and removal of working agent (freon) from split-units to appropriate disposal

- Servicing, storage and removal of external and internal split-unit according to the request of the investor (it must be agreed with the investor / beneficiary prior to commencement of the works)

- Removal and disposal of copper pipes of split-system, from the site to appropriate recycling yard.

- Removal and disposal of copper supporting girders of split-system, from the site to appropriate recycling yard.

At the installation must be included all the building works, electro-works mad preliminary & finishing works.

Specification of building works

- Recovery of existing penetration on the facade of the building

- Execution of the basement for external units (steel construction or concrete basement with anti vibration supports)

- Execution of duct for the passing of the pipeline routes

- Closure and sealing of the duct after the pipeline has been installed

- Coating of freon carrying pipeline with construction cover (as agreed on the spot).

Specification of electro-installation works:

- Review of the existing main distribution cabinet and checking of the capacity of the electro-cabinet.

- Reconstruction of the existing main distribution cabinet according to the needs of the air-conditioning system.

- Execution of new distribution cabinet for the needs of air.-conditioning system.

- Execution of cable routes from main cabinet to external and internal units

- Testing of electro-installations by authorised institution and drawing of report.

Specification of preliminary works:

- Review of project documentation.

- Recording of the condition of the site prior to the commencement of the works and introduction in the works.

- Drawing of Safety at work survey and Notification of the site to the competent work inspection authority.

- Creation of work and storage space at the site (temporary workshops and storages for equipment, material and tools)

- Insertion of all amendments in project documentation, which have occurred during the construction process, and which shall be used when drawing the "As built" design.

Specification of finishing works:

- Final cleaning and settlement of the site, including dismantling and removal of all temporary facilities ( containers, storages, sanitary facilities, etc.).

- Execution of framed drawings of the schemes of heating and cooling plants and their placing on the wall in the respective technical premises.

- Drawing of the specification of spare parts, necessary for maintenance of the installations in warranty period, including the specification of the activities required for regular maintenance, separately for each installation.

- Specification of documentation to be delivered to the Investor

- Declaration of quality and accuracy of executed works.

- Construction - site diaries, certified by Supervising engineer.

- Ruling on Company registration.

- Appointment of the responsible official, assigned the task of Site manager

- Contract on execution of subject works

- Specification of Statements on characteristics, certified by Site manager

- Statements on characteristics for all the built in material and equipment

- Pressure tests, certified by Supervising engineer

- Minutes on commissioning in test operation and regular operation of the heating and cooling installation (functional test )

- Minutes on measurement of micro-climate (measurement of noise day/night and temperature ) in working premises, made and certified by the authorised institution.

- Minutes on measurement of noise at the external area (measurement of noise day/night ) made and certified by the authorised institution.

- Minutes on executed fire safety for the passage of installation between separate fire compartments, including declaration of conformity for used material.

Fire safety must be made by authorised company.

- Execution of the "as built" record.

- Execution of the works according to the principle: design and build

- Evidences on the competence:

Reference/ certificate on the execution of the works on the installation of the system of air-conditioning and ventilation, at the facility with surface of minimum 3.000 m2 , according to the principle: design and build Statement that the Bidding company has employed Site manager - the chartered mechanical engineer , who has the reference of managing the works on the installation of the system of air-conditioning and ventilation , at the facility with surface of minimum 3.000 m2 , according to the principle: design and build

- Warranty for the works shall be at minimum 24 months from the takeover, and for the equipment at minimum 36 months from the takeover.