โ๐๏ธ๐งโ๐ ้
๐พ ๐ญ ๐ฌ โ ๐ ๐ ๐ฝ ๐พ ๐ ๐ถ ๐ ๐ ๐ โธ๏ธ ๐ค ๐ป ๐ท โฏ ๐ฑยธ ๐ฏ โแ แ r โธ ะดสท รณ โธโ ๐๊ ๐ ๐ ๐ ๐ ใฐ ฯ
โฆ ๐น ๐ชก ฮ สฐ ๊ป ๐ฟ
1ยฐF/ยฐR = 5/9 ยฐC/K
HVAC โ๐๏ธ
kw/RT = 3.516 / COP
Efficiency:
ๅคฉๅบ > ๅ ้ > ๆ ผๅGree
๐ฒ๐พ At T4(CHWS) = 15ยฐC, T2(CDWS) = 30ยฐC
- Every 1ยฐC โฌ๏ธ in T2 โก๏ธ ~6%โฌ๏ธ in COP
- Every 1ยฐC โฌ๏ธ in T4 โก๏ธ ~6%โฌ๏ธ in COP
๐ฒ๐พ At T4(CHWS) = 5ยฐC, T2(CDWS) = 30ยฐC
- Every 1ยฐC โฌ๏ธ in T2 โก๏ธ ~3.8%โฌ๏ธ in COP
- Every 1ยฐC โฌ๏ธ in T4 โก๏ธ ~4%โฌ๏ธ in COP
Fouling tendency:
York < Carrier < Trane
R123 < R134
Total Cooling Tower RT = ~1.2 x Total Chiller RT
้ๅทๅปๅก็ไธ็็ต่ฒปๆๆฏๅค่ฑ็ๆฐด่ฒปๅค
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) |
Compressor
Eff: Centrifugal > Screw > Scroll > Reciprocal
Isentropic
T2 โฌ๏ธ1ยฐC โก๏ธ ~1% โฌ๏ธ Compressor Power
Surge: P diff btwn refrigerant in Evap & Cond. > Design Max Chiller Lift, Backflow frm Cond. โก๏ธ 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
Condenser
Can Biofilm form on Silver surface?
๐พrโ๐ง๐ฟ๊โ ๐พะ๐r๐rโ๊๐ โธโo๐โo ๐แสฐrdสฐ ๐พllz๐งm๐คgts๐
ฯ๐ฟโฆ u ๐คโ enwrssliko ฯr๐rโn๐พs
๐พะ.๐r๐r-โ๊๐
Expansion Valve
SUBCOOL rfrgrnt blw boiling pt to ensure it enters Exp Valve as 100% liquid
Adiabatic
Evaporator
Humidity control is vital to Hospitals
Chiller: Every 1 ยบCโฌ๏ธ โช ~3% energy saving
๐ฑ๐ฏ๐ฟโ๐ฏ โะr ฯ๐ฟโฆ u ๐คโ enwrssliko ฯrฯrโn๐พs ๐ฑสฐs๐ฟ๐ฏhโ.โlhโdสฐ.kรณryos /โ๐
Oil Sump
Oil Sump Heater OFF when Chiller ON
Oil Sump Heater ON when Chiller OFF
Air Compressor
Air Compressor Designated Cool Temperature Difference (CTD) ~ 7-8 ยบC
Air Compressor: Every 3 ยบCโฌ๏ธ โช ~1% energy saving
#๐ข๏ธFrigaid
Ionโdipole 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
- Increase heat transfer efficiency by cleaning surface
- Increase refrigerant, bearing lubricity
- Enhance refrigerant boiling & condensation thermodynamics
[Modified Reverse Rankine Cycle (Refrigeration) with Superheating Loss, Subcooling Loss & Finite Heat-transfer Loss, Illustration
2023-Jul-18](https://blog.nutbox.io/@bsfmalaysia/ewqbb-modified-reverse-rankine-cycle-refrigeration-sook-jin-goh),
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
๐ฌrsoscare ๐ท๐ ฯr๊ ๐ฌ๐ะด๐๊ปrโ
- ๐พแ๊ป๐ป๐r๐r ๐ทf ๐ฌ๐ะด๐๊ปr ฯr๊ป๊ปr ๐รต ๐ฌou๐o๊ป
โ elaion swmbh (๐รต ๐๐พ๐ฏnแสฐ ๐๐ฏ ๐ฌ'kroฤผts)
โ ~ 1-2 yrs
Svng ~ 3 - 15%
๐ฐ๐ฐ๐ฐ๐ฐ๐ฐ๐ฐ
SGdoc3QgYW5ubCBwcmZ0ICBSTSByIHpyLCBtIHN0ZmY
็ ็ฉถ้กงๅ๐งโ๐
ๅช้ไธๅฐ้ป่ ฆ๏ผๆ็ฝ็ตก๏ผๅฐ่้ฝ่ฝๆๆฅญ
Ozone is not suitable for water sterilization in pharmaceutical production.
ๆ่บ็ตฒๆฉๅจ ๆฝคๆปๆฒน้่ฆๆ็กซ็ฃบ
ไธญๅ็ๆธ๏ผ็ด๏ผๅฏๅบฆๆฎ้ๆฏๆญ็พไพๅพๅคง๏ผๅพๆฒ้
