Tenders Are Invited For Modernization Of The Heating Installation In The Rcku School Complex In Trzcianka

The Subject Of The Order Are Construction Works Regarding The Modernization Of Gas Boiler Rooms For A School Building In The Town Of Trzcianka (Nowy Tomyśl Poviat) On Plot No. 101/11, Rev. 0009 Trzcianka. As A Heat Source For The Designed Investment, It Is Planned To Use A Cascade Of Two Identical Standing Capacitive Condensing Boilers With A Stainless Steel Exchanger. In Order To Improve The Energy Efficiency Of The New Installation, The Designed System Does Not Include A Hydraulic Clutch And Boiler Pumps, Which Will Reduce Investment And Operating Costs - This Is A Necessary And Necessary Requirement. Additionally, The New Installation Uses Two Active Returns (Low And High Temperature) At The Boilers. Each Gas Boiler Should Have A Single Gas Burner, Multi-Burner Solutions Are Not Allowed. Minimum Technical Parameters That A Condensing Gas Boiler Should Have: Technical Data Of The Designed Single Heating Device: • Heating Power Range Not Less Than 57 Kw And Not More Than 285 Kw At The Parameter 80/60°C, • Maximum Operating Pressure Not Less Than 6 Bar, • Maximum Supply Temperature Not Less Than 95°C, • Energy Efficiency For The Load Partial According To En15502 Standard Not Less Than 108.5%, • The Water Capacity Of The Boiler Cannot Be Less Than 0.9 L/Kw (Referring To The Heating Power At The Parameter 80/60°C), • Nox Class Not Worse Than 6 Acc. En-15502,• Maximum Electrical Energy Consumption By The Boiler Not More Than 365 W,• The Boiler Should Be Characterized By No Need To Ensure Minimum Flow,Minimum Technical Parameters For The Hydraulic System:• No Need To Use Return Temperature Protection.• Low Hydraulic Resistance Not More Than 10 Mbar (Δt = 20K For Maximum Power),Minimum Technical Parameters Of The Control System And Management Of The Operation Of Boilers And Installations: Each Boiler Should Have Built-In Weather Automation Enabling The Boilers To Operate In A Cascade Without The Need To Use Additional Cascade Modules, As Well As A Control Panel. Boilers With Stb 110°C Protection And Control Of Basic Heating Circuits: • Control Of The Heating Circuit With A Mixer • Control Of The Direct Heating Circuit • Control Of The Charging Circuit Dhw (Parallel Or Priority)Heating Circuitsthe Heating Medium In The Installation Is Divided Into Four Heating Circuits: - Mixing Circuit 1 (Remains Unchanged) Equipped With: • Mixing Valve, • Circulation Pump - Mixing Circuit 2 (Remains Unchanged) Equipped With: • Mixing Valve, • Circulation Pump - Mixing Circuit 3 (Remains Unchanged) Equipped With:• Mixing Valve,• Circulation Pump - The Hot Utility Water Charging Circuit (New Heating Circuit) Is Equipped With:• Circulation Pump. In Order To Prepare Hot Utility Water, It Is Planned To Replace The Existing Domestic Hot Water Heaters With One New Capacitive Single-Coil Heater With The Following Technical Parameters - The Heater Is Made Of Internal Steel Enameled, - Water Capacity 302 Dm3, - Maximum Pressure 6 Bar, - Coil Heating Surface 1.45 M2, - Thermal