✇🎛️🧑‍🎓 雜

𓃾 𓉭 𓂬 ⑂ 𓆓 𓈈 𓊽 𓋾 𓊀 𓁶 𓂋 𓂏 𓂀 ☸︎ 𓉤 𓃻 𓏷 ⚯ 𓃱¸ 𑀯 ⌂ገ ሠ r ⌸ дʷ ó ⌸₁ 𐌙ꕀ 𐌈 𓂕 𐌍 𐌆 〰  ϖ
⦠ 𓁹 🪡    Γ ʰ ꁻ 𓋿

1°F/°R = 5/9 °C/K

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HVAC ✇🎛️

kw/RT = 3.516 / COP

Efficiency:
天基 > 堃霖 > 格力Gree

🇲🇾 At T4(CHWS) = 15°C, T2(CDWS) = 30°C

• Every 1°C ⬆️ in T2 ➡️ ~6%⬇️ in COP
• Every 1°C ⬇️ in T4 ➡️ ~6%⬇️ in COP

🇲🇾 At T4(CHWS) = 5°C, T2(CDWS) = 30°C

• Every 1°C ⬆️ in T2 ➡️ ~3.8%⬇️ in COP
• Every 1°C ⬇️ in T4 ➡️ ~4%⬇️ in COP

Fouling tendency:
York < Carrier < Trane
R123 < R134

Total Cooling Tower RT = ~1.2 x Total Chiller RT

開冷卻塔省下的电費會比多花的水費多

Magnetic Chiller Highest COP at Lower Loading
Refrigerant Chiller Highest COP at Higher Loading

+ve pressure vs - ve pressure

Magnetic Chiller usually < 500 RT as technology not yet mature @ 2023

60-70% of chillers are in Asia

Magnetic flow meter is more accurate than ultrasonic.

Brand Type	Diff. Oil Prs. Normal Range
York Centrifugal	above 30Psid (207kPa)
Trane Centrifugal	between 18Psid (124kPa) to 22 Psid (151kPa)
Trane Screw	below 15 Psid (103kPa)
Carrier Centrifugal	between 16 Psid (110kPa) to 35 Psid (241kPa)
McQuay Centrifugal	above 60.9 Psid (420kPa)

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Compressor

Eff: Centrifugal > Screw > Scroll > Reciprocal

Isentropic

T2 ⬇️1°C ➡️  ~1% ⬇️ Compressor Power

Surge: P diff btwn refrigerant in Evap & Cond. > Design Max Chiller Lift, Backflow frm Cond. ➡️ Evap can happen

SUPERHEAT rfrgrnt abv boiling pt to ensure it enters cmprssr as 100% gas

Some Chillers are Compartmentalised (refrigerant loops & comprssrs separated)

Some Chillers use part of Cooling Water to cool Compressor

Compressor Voltage
Thailand 380V
Malaysia 415V / 6600V

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Condenser

Can Biofilm form on Silver surface?

𓃾r⌂𓂧𓋿ꕀ⊗ 𓃾Д𓂋r𓂋r⊗ꕀ𓂋 ⌸₁o𐌙⊗o 𓊀ገʰrdʰ 𓃾llz𓂧m𓉤gts😅 

ϖ𓋿⦠u 𓉤⊗ enwrssliko ϖr𓂋r⊗n𓋾s
𓃾Д.𓂋r𓂋r-⊗ꕀ𓂋

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Expansion Valve

SUBCOOL rfrgrnt blw boiling pt to ensure it enters Exp Valve as 100% liquid

Adiabatic

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Evaporator

Humidity control is vital to Hospitals

Chiller: Every 1 ºC⬇️ ↪ ~3% energy saving

𓃱𑀯𓋿⊗𑀯 ⑂Дr ϖ𓋿⦠u 𓉤⊗ enwrssliko ϖrϖr⊗n𓋾s 𓃱ʰs𓋿𑀯h₂.⑂lh₁dʰ.kóryos /⊗𐌍

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Oil Sump

Oil Sump Heater OFF when Chiller ON
Oil Sump Heater ON when Chiller OFF

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Air Compressor

Air Compressor Designated Cool Temperature Difference (CTD) ~ 7-8 ºC

Air Compressor: Every 3 ºC⬇️ ↪ ~1% energy saving

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#🛢️Frigaid

Ion–dipole bonding is stronger than hydrogen bonding.

https://www.quora.com/Can-you-add-Frigaid-to-gear-oil

https://www.quora.com/Can-you-add-Frigaid-to-engine-motor-oil

1. Increase heat transfer efficiency by cleaning surface
2. Increase refrigerant, bearing lubricity
3. Enhance refrigerant boiling & condensation thermodynamics

[Modified Reverse Rankine Cycle (Refrigeration) with Superheating Loss, Subcooling Loss & Finite Heat-transfer Loss, Illustration

](https://blog.nutbox.io/@bsfmalaysia/ewqbb-modified-reverse-rankine-cycle-refrigeration-sook-jin-goh), 2023-Jul-18

back on Top 5 Google Image Search Results for "Reverse Rankine Cycle" @ 2024-05-14

back on Top 10 Google Image Search Results for "Reverse Rankine Cycle" @ 2024-05-06

• back on Top 10 Google Image Search Results for "Reverse Rankine Cycle" @ 2024-04-09
  
• LinkedIn Image updated on Google Image search results for "reverse rankine cycle" but drop from Top 5 to Top 20 @ 2024-04-04
  
• Rises to Top 5 Google Image Search Results for "Reverse Rankine Cycle"on 2024-03-30
  
• 7th Google Image Search result for "Reverse Rankine Cycle" @ 2024-01-12
  

Preventive Saving & Measured (Restorative) Saving of Chillers
, 2023-Feb-10 / STM
/ twt

𓂬rsoscare 𓏷𐌍 ϖrꕀ 𓂬𐌍д𐌍ꁻr✔

• 𓃾ገꁻ𓃻𓂋r𐌈r 𓏷f 𓂬𐌍д𐌍ꁻr ϖrꁻꁻr 𓊀õ 𓂬ou𐌙oꁻ
  ❌ elaion swmbh (𓊀õ 𓊀𓋾𑀯nገʰ 𓊀𑀯 𓂬'kroļts)

Frigaid LinkedIn Product Page

Frigaid Playlist

⌛ ~ 1-2 yrs
Svng ~ 3 - 15%

💰💰💰💰💰💰
SGdoc3QgYW5ubCBwcmZ0ICBSTSByIHpyLCBtIHN0ZmY

https://www.quora.com/Is-FRIGAID-stereospecific-or-is-it-a-mixture-of-enantiomers-and-or-diastereomers

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研究顧問🧑‍🎓

只需一台電腦，有网絡，到處都能操業

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Ozone is not suitable for water sterilization in pharmaceutical production.

Enhancement of Cathode Dust Collection and its Application in Improving the Efficiency of Dry Electrostatic Precipitator

打螺絲機器 潤滑油需要有硫磺

Measuring ensemble-averaged surface-enhanced Raman scattering in the hotspots of colloidal nanoparticle dimers and trimers

中國的書（紙）密度普遍比歐美來得大，很沉重

Playlist: Technology 科技