Scope of Work_HVAC purchase and installation_Split School.pdf

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.

Specifications for the HVAC systems to be purchased for the schools in Split:

VRF (Variable Refrigerant Flow) systems:

VRF SYSTEM - EXTERNAL UNITS

VRF (Variable Refrigerant Flow) ECOi air-cooled unit for outdoor or indoor installation in a heat pump design with built-in hermetic compressors and exchanger and can connect up to 4 outdoor units and up to 64 indoor units.

"In the event of a compressor malfunction, the" backup "option is activated, in which another outdoor unit or other compressor within the same outdoor unit continues to operate.

The unit provides the Load Level Control LLC with the function of continuously changing the evaporation temperature and the condensation temperature of the work medium to room temperature throughout the year, for additional energy savings and greater comfort due to higher media temperatures. "

"Unit operating temperature range:

- in cooling mode from Tv = -10 ° C st to + 52 ° C st,

- in heating mode from Tv = -25 ° C wt to + 18 ° C wt.

The units are designed to operate from 50% to 200% capacity ratio. "

"The units are modular with a basic load-bearing frame and galvanized steel panels with adequate protection for exterior and interior installation.

The structure of the unit is protected by anti-corrosion coating for resistance to rust and salty atmosphere.

Up to a size of 20HP units can be 1 module, and larger units of two or three modules. The 16HP, 18HP and 20HP units can also be made up of two modules. The maximum dimension is 80HP. All modules have the same height and depth, making it easy to install in rows. "

The air-freon heat exchanger, ie condenser / evaporator, is designed to work with R410A. The aluminum fins of the heat exchanger are surface protected from atmospheric influences by BLUEFIN finish.

"The refrigerant circuit of the unit consists of hermetic inverter two-rotary compressors, a four-way valve for turning the operating mode, a manifold, a filter and an oil separator. The units are factory tested, vacuumed and pre-filled with R410a refrigerant.

Hermetic two-turn compressors are sound insulated. The 8HP, 10HP, 12HP modules have one compressor and 14HP, 16HP, 18HP and 20HP have two compressors. "

The unit picks up air from the sides, and ejects vertically upward through the protective grille. The fan section of the unit has an external static pressure of 80 Pa which enables installation inside the room. Units 8HP to 16HP have one axial fan, while 18HP and 20HP units have two axial fans.

Silent night mode with reduced sound pressure reduction capacity by -3 dB (A) in the first stage and -5 dB (A) in the second stage.

"All control and protection functions are controlled via a built-in microprocessor controller. High and low pressure transducers, coolant temperature sensors, oil temperature, exchanger temperature and outside temperature are installed. The unit is equipped with on / off steam and liquid phase valves and service valves .

Control electronics are coated with a layer of silicone that protects electronic components from the effects of weather conditions such as moisture and dust. "

Power supply: 380/400/415 V at 50Hz

"The thermal characteristics are given under nominal conditions:

Cooling Tv = 35 ° C wt, Tv = 24 ° C wt, Tp = 27 ° C wt, Tp = 19 ° C wt

Heating Tv = 7 ° C st, Tv = 6 ° C vt, Tp = 20 ° C st "

Maximum total pipe length: 1000m (equivalent length 200m).

Allowed height difference between outdoor and indoor units: 50m (90m)

Allowed height difference between indoor units: 15m (30m)

VRF SYSTEM - INTERNAL UNITS

VRF ECOi heating and cooling unit designed for wall mounting, type K2 with easy-to-wash mask.

Unit equipped with fan, air filter, heat exchanger with direct freon exposure, electronic expansion valve, and all necessary elements for protection, control and regulation of the device and temperature.

"The thermal characteristics are given under nominal conditions:

Cooling Tv = 35 ° C wt, Tv = 24 ° C wt, Tp = 27 ° C wt, Tp = 19 ° C wt

Heating Tv = 7 ° C st, Tv = 6 ° C vt, Tp = 20 ° C st "