The Subject Of The Public Contract Is The Installation Of Alternative Cooling Units In The Thermal Hotel In Karlovy Vary. Contents Of Performance: Currently, The Building Is Cooled Using Two Central Trane Cooling Units With A Capacity Of 720 Kw, Connected On The Secondary Side To The So-Called Open Cooling Tower, And Therefore They Can Only Be In Operation During The Summer And Transitional Period (Approx. 8-9 Months A Year). Furthermore, These Units Only Have A Minimal Re-Use Of Waste Heat In The Form Of Upstream Preheating Of A Tv With An Output Of Approx. 20 Kw. In Addition, The Cooling Towers Are Disconnected And Drained For Most Of The Main Heating Period (Cooling Is Not In Operation). The Content Of The Contract Is The Rebuilding Of The Cooling Circuit, Which Will Subsequently Enable Year-Round Cooling Operation And, In Particular, On A Significant Scale, The Use Of The Waste Heat Obtained In This Way. As Part Of The Contract, Two Heat Pumps With A Total Cooling Capacity Of 162 Kw Will Be Installed At Temperature Gradients Of 8/16°C On The Primary Side And 60/55°C On The Secondary Side. This Solution Can Be Further Expanded In The Future, According To The Needs Of The Operation. On The Primary Side, This Solution Will Enable Year-Round Cooling Operation And At The Same Time Significantly Limit The Costly Operation Of Open Cooling Towers To An Expected Maximum Of 3 Months A Year. In Addition, Only Surplus Power Above The Level Of 162 Kw Will Go To Cooling Towers That Do Not Allow Heat Recovery, Or That Only Allow Minimal Recovery. On The Secondary Side, This Solution Makes It Possible To Obtain A Stable Source Of Heat For The Needs Of Operation With A Power Of 60 - 162 Kw. This Heat Will Be Used Primarily For The Production Of Hot Water For Hotel And Restaurant Operations, But It Can Also Be Used In The Tv System. This Will Result In Significant Savings In The Form Of A Reduced Need To Purchase Heat From Czt. On The Cold Side, Cold Water Will Be Accumulated In A Tank With A Volume Of 1000 L. The Cooling Water Will Then Be Distributed Through The Plate Heat Exchanger To The Cooling Branch Of The Casino (Fcu And Ahu Unit), The Uncollected Part Of The Cold Will Then Be Used In The Existing Distributor And Cold Collector For The Hotel. In The Event Of A Shutdown Of The Proposed Alternative Cooling, It Will Be Possible To Supply The Casino With Cold From The Existing Cold Distributor And Collector (And Thus Also Use The Trane Central Cooling Units). Both Cooling, Main And Alternative, Can Be Operated Simultaneously. Secondary Side Incl. The Tank Is A Separate Pressure Unit, Which Is Equipped With Its Own Security Device, The Maximum Pressure Is Considered To Be 5 Bar. This Pressure Part Will Be Filled With Antifreeze With A Concentration Of 20%. A Storage Tank Of 1000 L Will Also Be Installed On The Secondary Side Due To The Hydraulic Separation Of The Tč Circuit From The Consumers. The Following Groups Of Appliances Can Then Be Supplied With Heat From The Storage Tank: 1) Crittall – The Use Of Heat For Crittall Is Primarily Considered, As The Temperature Drop Is Lower Than For Other Appliances, And In This Way The Highest Efficiency Of The Device Will Be Achieved; With Regard To Other Pressure Conditions, The System Is Separated By A Plate Exchanger 2) Hotel And Cinema Appliances, Especially In The Transitional Period; With Regard To Other Pressure Conditions, The System Is Separated By A Plate Exchanger 3) Tv Heating – Will Be Used Especially In The Period When There Is No Consumption In Other Dh And Hvac Appliances; Considering The Required High Output Temperature, The Tv Heating Will Be The Least Effective, However, In The Non-Heating Season, This Will Be The Only Appliance That Can Be Used. As Part Of The Tv Heating, The Existing Tank Will Be Heated With The Heat From The Heat Pumps, Which Is Already Connected On One Side To The Return Pipe To The Heat Exchanger Via A Distribution Three-Way Valve, And On The Other Side Will Then Be Newly Connected To Charging With The Heat Pump. Furthermore, A Currently Unused Storage Tank With A Volume Of 10M3 Will Be Newly Used, Which Will Be Connected In Series With The Already Connected Storage Tank. On The Heating Branches, The Connection Is Made In Such A Way That The Return Water Will Be Heated, Proceeding To The Hot Water Exchangers, With The Fact That The Hot Water Exchangers Will Be Used As The Second Stage. The Mar System Evaluates Where To Most Advantageously Distribute The Heat With Regard To The Lowest Possible Temperature. The Secondary Side Forms One Pressure Unit With The Secondary Side Of The Hv/Heating Water Exchanger For The Tv, The Operating Pressure Is Approx. 4 Bar. The Security Device Is Existing And Is Located In The Zzt Machine Room. The Need For Heat Suppression At A Time When It Will Not Be Possible To Use All The Heat In The Appliances, But The Need For Cold Will Continue, Is Considered Through The Hvac Unit From The Heat Exchanger For The Cinema. Primarily, It Is Expected To Be Prevented Via The Heat Exchanger For The Parking Lot (Approx. 400 Kw), Or Via The Hvac Units For Halls And Halls, Which Would Thus Be Tempered Even When This Is Not Needed. Tampering Is Assumed Only Exceptionally. Part Of The Project Is The Connection Of The Ahu Unit For The Casino From The Heating And Cooling Water Side, And The Introduction Of Heat And Cold Connections To The Casino Premises. Installation Of Alternative Cooling Units Is Required Mainly For The Following Reasons: - Year-Round Cooling Of The Newly Established Casino (Requirement For Installed Power Is 60 Kw + Ventilation Air Cooling) - Cooling Of Rooms Where The Sun Shines Even In The Transitional And Winter Months, And Where, In Order To Achieve A Comfortable Temperature, It Is Necessary To Have Cooling Water Available Even When The Main Cooling Unit Is Shut Down. The Heat From The Secondary Side Of The Cooling Units Will Be Used For Tv Heating And Heating, Exceptionally It Will Be Wasted In The Air Conditioning Units. In Times Of High Demand For Cooling, The Original Main Cooling Units Will Be In Operation, While The Superior Control System Will Evaluate Which Source Will Be Operationally Optimal. The Mar System And The Electrical Installation Connection For The Tč Is Not Part Of The Project, Due To The Continuity With The Existing Systems, This Will Be Ensured By The Contracting Authority.
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