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At low outdoor temperatures, cooling can be produced almost without a compressor (Free Cooling), and waste heat is a gift for hot water. AI utilizes both.</p> </div> </section>  <div class="wiz-wrap"> <div class="wiz"> <div class="wiz-steps" id="steps"> <div class="st on" data-s="1" onclick="go(1)"><span class="no">1</span><span class="lbl"> Comprendre </span></div> <div class="st" data-s="2" onclick="go(2)"><span class="no">2</span><span class="lbl">View live</span></div> <div class="st" data-s="3" onclick="go(3)"><span class="no">3</span><span class="lbl">What the AI does</span></div> <div class="st" data-s="4" onclick="go(4)"><span class="no">✓</span><span class="lbl">Your benefit</span></div> </div> <div class="wiz-body" id="body"></div> </div> <div class="mini-flow"><span class="mf here">Refrigeration technology and cooling</span><span class="ar">→</span><a class="mf next" href="/glaesern/hotel/wizards/beleuchtung/" style="text-decoration:none">Lighting & Room.</a></div> </div>  <section style="max-width:1000px;margin:0 auto;padding:.5rem 20px 1.5rem"><div style="background:linear-gradient(135deg,#f0fbf9,#fff);border:1px solid var(--accent-ultra,#fdba74);border-radius:16px;padding:1.2rem 1.4rem"><div style="font-size:.76rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent,#ea580c);font-weight:800;margin-bottom:.7rem">Thematically related</div><div style="display:flex;flex-wrap:wrap;gap:.55rem"><a href="https://stromfee.energy/weather/extremes.html" style="display:inline-flex;align-items:center;gap:.35rem;font-size:.9rem;font-weight:700;padding:.5rem .9rem;border-radius:999px;background:#fff;border:1px solid var(--accent-ultra,#fdba74);color:var(--accent,#ea580c);text-decoration:none">🌡️ Global temperature extremes (hottest/coldest cities) →</a><a href="https://stromfee.ai/loesungen/netzmonitoring.html" style="display:inline-flex;align-items:center;gap:.35rem;font-size:.9rem;font-weight:700;padding:.5rem .9rem;border-radius:999px;background:#fff;border:1px solid var(--accent-ultra,#fdba74);color:var(--accent,#ea580c);text-decoration:none">Network tracking →</a><a href="https://stromfee.ai/loesungen/waermepumpe-messkonzept-14a-monitoring.html" style="display:inline-flex;align-items:center;gap:.35rem;font-size:.9rem;font-weight:700;padding:.5rem .9rem;border-radius:999px;background:#fff;border:1px solid var(--accent-ultra,#fdba74);color:var(--accent,#ea580c);text-decoration:none">Heat pump measurement concept §14a →</a></div></div></section>   <section style="max-width:1000px;margin:0 auto;padding:1.5rem 20px"> <h2 style="font-size:1.35rem;font-weight:800;margin-bottom:6px">One level lower — 2 components</h2> <p style="color:#64748b;font-size:.95rem;margin-bottom:14px">This station explains the set.</p> <div style="display:grid;grid-template-columns:repeat(auto-fill,minmax(230px,1fr));gap:10px"><a href="/glaesern/hotel/" style="display:block;background:#fff;border:1px solid #fff7ed;border-radius:12px;padding:12px 14px;text-decoration:none;color:#0f172a;font-weight:600;font-size:.93rem">Chilled water production unit</a><a href="/glaesern/hotel/" style="display:block;background:#fff;border:1px solid #fff7ed;border-radius:12px;padding:12px 14px;text-decoration:none;color:#0f172a;font-weight:600;font-size:.93rem">Free Cooling & Waste Heat</a></div> <p style="margin-top:12px;font-size:.88rem"><a href="/glaesern/hotel/" style="color:#ea580c;font-weight:600">All components at a glance →</a></p> </section> <section class="cta-band" id="kontakt"> <div class="s-inner reveal"> <h2>Would you like to see your hotel in an equally transparent way?</h2> <p>We digitally model the energy technology of your hotel in real-time — air conditioning, hot water, swimming pool, kitchen, laundry, peak loads. The first energy audit is free.</p> <div class="cta-row" style="justify-content:center;margin-top:1.6rem;flex-wrap:wrap"> <a href="https://wa.me/491711988926" target="_blank" rel="noopener" class="btn btn-primary" style="background:#25D366;border-color:#25D366">Write via WhatsApp →</a> <a href="mailto:info@stromfee.ai?subject=Gl%C3%A4sernes%20Hotel%20%E2%80%94%20HVAC" class="btn btn-ghost">Write to Vision-AI</a> <a href="tel:+4952234921030" class="btn btn-ghost">+49 5223 4921030</a> </div> </div> </section> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What is Free Cooling?", "acceptedAnswer": {"@type": "Answer", "text": "At low outdoor temperatures, the recovery unit cools the chilled water almost without a compressor. The chiller remains off, and electricity consumption for cooling decreases significantly."}}, {"@type": "Question", "name": "What is EER?", "acceptedAnswer": {"@type": "Answer", "text": "The EER (Energy Efficiency Ratio) indicates how much cooling is produced per kilowatt-hour of electricity used. It is calculated from the refrigeration capacity and electrical consumption; it is not measured natively."}}, {"@type": "Question", "name": "Can waste heat from cooling be used?", "acceptedAnswer": {"@type": "Answer", "text": "Yes. The condenser continuously rejects heat. Instead of cooling it, it is used for preheating hot water."}}]}</script> <div id="stationsNav"></div> <section class="faq-wrap" id="faq"><h2>Frequently asked questions</h2><details class="faq-item"><summary>What is Free Cooling?</summary><div class="faq-a">At low outdoor temperatures, the recovery unit cools the chilled water almost without a compressor. The chiller remains off, and electricity consumption for cooling decreases significantly.</div></details><details class="faq-item"><summary>What is EER?</summary><div class="faq-a">The EER (Energy Efficiency Ratio) indicates how much cooling is produced per kilowatt-hour of electricity used. It is calculated from the refrigeration power and electrical consumption; it is not measured natively.</div></details><details class="faq-item"><summary>Can we use waste heat from the cooling?</summary><div class="faq-a">Yes. The condenser continuously rejects heat. Instead of cooling it, it is used for preheating hot water.</div></details></section>  <footer class="footer"> <div class="footer-inner"> <div>© 2026 Vision-AI GbR ·<strong>Dirk Husterklatte</strong>· Holger Roswandowicz</div> <ul> <li><a href="https://stromfee.ai"> stromfee.ai </a></li> <li><a href="/glaesern/hotel/"> Hotel-Specials </a></li> <li><a href="https://stromfee.ai/loesungen/"> Lösungen </a></li> <li><a href="/impressum.html">Legal notice</a></li> <li><a href="/datenschutz.html">Data protection</a></li> </ul> </div> </footer> <div class="fab-sos"> <a href="https://wa.me/491711988926" target="_blank" rel="noopener" class="fab-wa" aria-label="WhatsApp"> <svg viewBox="0 0 24 24" fill="currentColor" aria-hidden="true"><path d="M12.04 2c-5.46 0-9.91 4.45-9.91 9.91 0 1.75.46 3.45 1.32 4.95L2 22l5.25-1.38c1.45.79 3.08 1.21 4.79 1.21 5.46 0 9.91-4.45 9.91-9.91S17.5 2 12.04 2zm5.8 14.16c-.24.68-1.4 1.3-1.93 1.38-.49.07-1.13.1-1.82-.11-.42-.13-.96-.31-1.65-.61-2.9-1.25-4.8-4.17-4.94-4.36-.15-.19-1.19-1.58-1.19-3.01 0-1.43.75-2.14 1.02-2.43.27-.29.58-.36.78-.36.19 0 .39 0 .56.01.18.01.42-.07.66.5.24.59.82 2.04.89 2.19.07.15.12.32.02.51-.1.19-.15.31-.29.48-.15.17-.31.38-.44.51-.15.15-.3.31-.13.6.17.29.76 1.25 1.63 2.03 1.12 1 2.07 1.31 2.36 1.46.29.15.46.12.63-.07.17-.19.73-.85.92-1.14.19-.29.39-.24.66-.15.27.1 1.71.81 2 .96.29.15.49.22.56.34.07.12.07.69-.17 1.37z"/></svg> <span> WhatsApp </span> </a> </div>  <script type="application/json" id="dgm2000-kernfilm-marker">{"pipeline": "hotel-kernfilm", "station": 6, "slug": "kaelte", "title": "Refrigeration and cooling technology", "url": "/glaesern/hotel/anlage/kaelte.html", "poster": "/glaesern/hotel/tiles/tile-anlage-kaelte.jpg", "payoff": "Use Free Cooling, utilize waste heat, save compressor power."}</script> <script src="/hotel-specials/anlage/spark.js"></script> <script> var TILE='/glaesern/hotel/tiles/'; var BWE='/hotel-specials/anlage/api/bwe.json'; var state={step:1}; var live=null, liveErr=false; function num(x,d){ if(x==null||isNaN(x)) return '–'; d=(d==null?0:d); return Number(x).toLocaleString('de-DE',{minimumFractionDigits:d,maximumFractionDigits:d}); }'<li><span class="b">✓</span><span>'+t+'</span></li>'; }"kpi"><div class="kl">'+l+'</div><div class="kv">'+val+(u?' <span class="ku">'+u+'</span>':'')+'</div>'+(sig?'<div class="spark" data-sig="'+sig+'"'+(el?' data-el="1"':'')+'></div>':'')+'</div>'; }"step-grid"><img class="step-img" src="'+TILE+'tile-anlage-kaelte.jpg" alt="Technique du froid et du refroidissement">'+"step-kicker">Step 1 · Understanding</p><h2 class="step-h">Refrigeration and cooling technology — the technology behind it</h2>'+"step-p">A <b>Chilled water production group</b> (Chiller) produces cold water with typically 6 degrees flow and 12 degrees return for space cooling and process cooling, as well as the <b>cold rooms</b>. A cooling plant releases the heat.</p><p class="step-p">Two levers: <b>Free Cooling</b> uses the cooling plant directly when the outside air is cool, and the compressor remains off most of the time. And the <b>waste heat</b> of the condenser can be used for hot water instead of being cooled away. The key figure is the EER (cooling per electricity).</p></div></div>'+"margin-top:1.4rem"><p class="step-kicker">Measured at the register</p>'+"chk" style="columns:2;column-gap:1.6rem">'+li('<b>Chilled water return and supply</b> (6 and 12 degrees respectively)')+li('<b>Electrical power</b> of the chiller, from which <b>EER</b>>')+li('<b>Outside temperature</b> — authorization for Free Cooling')+li('<b>Waste heat from the condenser</b> as a source of hot water')+'</ul>'+"benefit" style="margin-top:1.3rem"><h3 style="font-size:1.08rem">Thus we connect your refrigeration technology — read-only</h3>'+"margin:0 0 .3rem">We read your <b>existing technology</b>, without modifying the settings (read services only):</p>'+"chk" style="margin-top:.4rem">'+li('<b>Chiller</b> via BACnet or Modbus — chilled water temperatures, compressor status, errors.')+li('<b>Modbus electrical meter</b> on the chiller for actual electrical power — EER is calculated (cooling per electricity).')+li('<b>Outdoor sensor</b> for Free-Cooling authorization.')+'</ul></div></div>'+nav(1);"step-p">Values not currently available.</p>'; }"step-p">Loading values…</p>'; }"live-head"><span class="live-dot"></span><span class="live-status">Cold operation active</span>'+"live-sub">· anonymous reference · measured values</span></div>'+(window.Spark?Spark.toolbarHTML():'')+"kpis">'+kpi('Chilled water supply', num(v('kaelte_kaltwasser_vl'),1), '°C', 'kaelte_kaltwasser_vl')+kpi('Chilled water return', num(v('kaelte_kaltwasser_rl'),1), '°C', 'kaelte_kaltwasser_rl')+kpi('Chiller output', num(v('kaelte_leistung'),1), 'kW', 'kaelte_leistung')+kpi('EER', num(v('kaelte_eer'),1), '', 'kaelte_eer')+'</div>'+"step-p" style="margin-top:1.1rem;font-size:.92rem;color:var(--text-3)">Anonymous reference values. EER (cooling by electricity) is not a native measurement value like COP — it is calculated from the cooling power and electrical consumption.</p>';"step-kicker">Step 2 · View live</p><h2 class="step-h">Refrigeration and cooling technology — in real-time</h2>'+inner+nav(2);"step-grid"><div><p class="step-kicker">Step 3 · What the AI does</p>'+"step-h">The AI monitors cooling</h2><ul class="chk">'+li('Activate <b>Free Cooling</b> as soon as the outside temperature allows — the compressor remains mostly off.')+li('Use <b>condenser waste heat</b> for hot water instead of cooling it.')+li('<b>Increase the chilled water temperature</b> as much as demand allows — every degree saves compressor electricity.')+li('Detect a <b>falling EER</b> (fouling, refrigerant) early.')+'</ul></div>'+"step-img" src="'+TILE+'tile-anlage-kaelte-ki.jpg" alt="KI-Überwachung Kälte- & Kühltechnik"></div>'+"szenSlot"></div>'+"<div style=\"margin-top:1.4rem;background:linear-gradient(135deg,#0d2b2a,#0a1c1b);border-radius:18px;padding:1.35rem 1.45rem;color:#fff\"><div style=\"font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent-bright);font-weight:800;margin-bottom:.5rem\">And where this AI runs</div><h3 style=\"margin:0 0 .55rem;font-size:1.22rem;font-weight:800;color:#fff\">In your building — offline. Your own hotel LLM.</h3><p style=\"margin:0 0 .5rem;color:rgba(255,255,255,.85);line-height:1.62\">The industry's booking and revenue AI (Oracle OPERA Cloud, Mews, IDeaS) runs exclusively in the <b>Cloud</b> — even energy AI is mostly \"as a Service\". At Stromfee, the AI runs <b>locally on your hardware</b>: not a single byte leaves the building.</p><ul style=\"list-style:none;padding:0;margin:.4rem 0 0;display:flex;flex-direction:column;gap:.5rem\"><li style=\"color:rgba(255,255,255,.9);line-height:1.5\"><span style=\"color:var(--accent-bright);font-weight:800\">✓</span> <b>Your own hotel LLM</b> on a GPU in your network (Ollama), not with a provider.</li><li style=\"color:rgba(255,255,255,.9);line-height:1.5\"><span style=\"color:var(--accent-bright);font-weight:800\">✓</span> <b>Data sovereignty:</b> Processing remains in-house, not in external clouds.</li><li style=\"color:rgba(255,255,255,.9);line-height:1.5\"><span style=\"color:var(--accent-bright);font-weight:800\">✓</span> Energy AI + on-premise — this combination is not available elsewhere on the market.</li></ul><a href=\"https://stromfee.ai/loesungen/ki-ohne-datenabfluss.html\" style=\"display:inline-block;margin-top:.7rem;color:var(--accent-bright);font-weight:700;text-decoration:none\">→ AI without data leakage</a></div>"+nav(3); } var SZEN={sig:'kaelte_eer',unit:'',dec:1,title:'Kälte-Wirkungsgrad EER',monitor:'laufend · Kältekreis',risk:'fällt der EER durch Verschmutzung oder Kältemittelmangel, steigt der Verdichterstrom stark —',cost:'jede Zehntel EER weniger kostet spürbar Strom.',kiAktion:'Die IA erkennt den EER-Abfall früh und meldet Reinigung oder Wartung, bevor der Verbrauch explodiert.'};'<p class="step-kicker">Étape 4 · Votre bénéfice</p><h2 class="step-h">Pourquoi cela compte</h2>'+ '<div class="benefit"><h3>Free Cooling nutzen, Abwärme verwerten, Verdichterstrom sparen.</h3><p>Kälte ist teuer, wenn der Verdichter unnötig läuft. Wer Free Cooling konsequent freigibt, die Abwärme nutzt und die Kaltwassertemperatur bedarfsgerecht führt, senkt den Verbrauch deutlich.</p></div>'+ '<div class="cta-row2"><a href="https://wa.me/491711988926" target="_blank" rel="noopener" class="wiz-next" style="background:#25D366;box-shadow:0 10px 26px rgba(37,211,102,.28)">Hotel gläsern machen →</a>'+ '<a href="https://stromfee.ai/loesungen/" class="wiz-back" style="align-self:center">→ Stromfee Lösungen</a></div>'+ '<a class="next-stage" href="/glaesern/hotel/wizards/beleuchtung/"><div><b>Nächste Station:</b> Éclairage & Chambre. </div><span class="arw">→</span></a>'+"text-align:center;margin-top:1.3rem"><button class="wiz-back" onclick="go(1)">↻ From the beginning</button></div>';"wiz-back" onclick="go('+(s-1)+')">← Back</button>':'<span></span>'; return '<div class="wiz-nav">'+b+'<button class="wiz-next" onclick="go('+(s+1)+')">Weiter →</button></div>'; }'body'); b.innerHTML=state.step===1?step1():state.step===2?step2():state.step===3?step3():step4();'#steps .st').forEach(function(el){ var n=+el.getAttribute('data-s'); el.classList.toggle('on',n===state.step); el.classList.toggle('done',n<state.step); });'szenSlot'); if(s) Spark.szenario(s,Object.assign({},SZEN,{live:szenLive()})); } }'.wiz-wrap').offsetTop-70,behavior:'smooth'}); }'no-store'}).then(function(r){return r.json();}).then(function(d){ live=d; if(state.step===2) render(); }).catch(function(){ liveErr=true; if(state.step===2) render(); }); } render(); </script> <script defer src="/sf-a.js"></script> <script src="/navstruct.js"></script> </body> </html>