p.1.2 ke2 evaporator efficiency smart defrost management companion literature b.1.1 1. energy...
TRANSCRIPT
P.1.2
KE2 Evaporator EfficiencySmart Defrost Management
Companion Literature B.1.1
1. Energy savings through precise evaporator control
2. True demand defrost initiated by loss of evaporator efficiency
3. Efficient defrost management and termination
• Optional Electronic Expansion Valve control
• CommunicationsSlide P.T2 - 1
The basic kinds of defrost controllers:
Slide P.1.2 - 4Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Time ClockElectromechanical or Electronic Time Initiate-Time Terminate
Reactive -Time DependentMicro-ProcessorTime Initiate-Temperature Terminate
Microprocessor controlled pro-activeKE2 Evaporator Efficiency defrost
3
Slide P.1.2 – 5Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Evaporator capacity decreases with accumulation of frost
Understanding Evaporator Performance
P.1.2
KE2 Evaporator EfficiencySmart Defrost Management
1. Up or down arrow to desired room set point
2. Select defrost mode• Electric• Hot Gas• Air
3. Select expansion device• Mechanical TEV• Electric expansion
valve
Copyright 2010 KE2 Therm Solutions, Inc. Washington,
Missouri
Slide P.T2 - 8
KE2 Evap – only requires two inexpensive temperature sensors for defrost control
Change in ΔT indicates need for defrost
Slide P.1.2 - 9Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
No Defrost Control Established (Baseline Data Only)LOCATION: Osborne
Middle School
Ke2Therm Defrost Control EstablishedLOCATION:
Osborne Middle School
Circle of ConcernValley Park, Mo.
Defrost frequency per average week
Copyright 2010 KE2 Therm Solutions, Inc. Washington,
Missouri
Slide P.T2- 12
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 13
Some examples:
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 14
Some examples:
“Free cooling” – Latent energy recovery
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 15
Proper fan control during operation provides “free cooling” by sublimating frost to chill room
Typical Pump Down Cycle
Pump-Down Control Liquid Line Solenoid
Temperature Control
Latent energy recovery
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 17
Latent energy recovery - Advantages
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 18
Less dehumidification and shrinkage of product
Reduced need for defrost heat
Energy savings
Highest possible cooling capacity
Even room temperature
Optimal performance of unit cooler
Reduced compressor operation time
Longer compressor life
Re-humidification
Electric defrost based on time
Slide P.1.2 - 19Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
80% additional heat gain (radiation + convection) due to high heater temperature
High coil temperatur
e drives “fog” into the room
Consequences of fogging
Slide P.1.2 - 20Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 21Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Consequences of excessive heat
Pulsed defrost heaters
Slide P.1.2 - 23Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Ensures lower terminal coil temperature, less energy usage, decreased product heating
Only 20% additional heat gain (radiation + convection) due to heater temperature
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 34
Optional EEV control possible with pressure transducer and suction temperature sensor
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 35
KE2 Evap provides control & communication
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
Slide P.1.2 - 36
TCP/IP enabled
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
37
Good Eats #1234
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
38
Location:Good Eats #1234
Good Eats #1234
Copyright 2010 KE2 Therm Solutions, Inc. Washington, Missouri
39
Location:Good Eats #1234
Osborne Middle School Test
LOCATION: Osborne Middle School
No Defrost Control Established (Baseline Data Only)
Room Temp +25F
Coil Temp
+100 F
23 Defrosts in 5 Days, Total Time In Defrost
8.4 Hours
Week One
No Defrost Control Established (Baseline Data Only)
LOCATION: Osborne Middle
SchoolRoom Temp +25F
Coil Temp
+100 F
22 Defrosts in 5 Days, Total Time in Defrost
8.0 Hours
Week Two
Ke2Therm Defrost Control EstablishedLOCATION: Osborne
Middle SchoolRoom Temp +10F
Coil Temp +50 F
9 Defrosts in 5 Days. Total Time in Defrost
1.7 Hours
Week Three
Ke2Therm Defrost Control EstablishedLOCATION:
Osborne Middle School
Room Temp +10F
Coil Temp +50 F
3 Defrosts in 5 Days. Total Time in Defrost
1.0 Hours
Week Four
Osborne Middle School
Osborne
Osborne
Osborne
Osborne
11.8%Reducti
on
26.1%Reducti
on
84.2%Reducti
on
Compressor
Fans Heaters
Berkmar Middle School Test
0
LOCATION: Berkmar Middle
School
No Defrost Control Established (Baseline Data Only)
Week OneRoom Temp +25F
Coil Temp
+100 F
22 Defrosts in 5 Days, Total Time in Defrost
8.0 Hours
LOCATION: Berkmar Middle
School
No Defrost Control Established (Baseline Data Only)
Week TwoRoom Temp +25F
Coil Temp
+100 F
22 Defrosts in 5 Days, Total Time in Defrost
8.0 Hours
LOCATION: Berkmar Middle
SchoolKe2Therm Defrost Control Established
Week Three
Room Temp +15F
Coil Temp +50 F
2 Defrosts in 5 Days, Total Time in Defrost
0.7 Hours
LOCATION: Berkmar Middle
SchoolKe2Therm Defrost Control Established
Week Four
Room Temp +15F
Coil Temp +50 F
2 Defrosts in 5 Days, Total Time in Defrost
0.5 Hours
Berkmar Middle School
Berkmar
Berkmar
Berkmar
Berkmar 19.4%Reductio
n
11.4%Reductio
n
94.4%Reductio
n