Understanding Tesla's Heat Pump System
Discover the remarkable heat pump technology integrated into Tesla Models S, 3, X, and Y from 2021 and onwards. Find out how to identify if your Tesla vehicle has this system and gain insights into how it harnesses heat from 16 distinct sources to warm up the cabin, battery, and powertrain electronics.
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POST-VIDEO ADDITIONS:
1. The system's A/C compressor is a high-volume Denso 41cc, while Teslas equipped with a PTC cabin heater use a Hanon 33cc A/C compressor.
CORRECTIONS:
1. I sit corrected regarding the six Electronic Expansion Valves (EXVs) of the supermanifold. They actually utilize precision stepper motors instead of pulse-width modulated solenoids. I appreciate Engineerix for pointing out my mistake.
TIMELINE:
0:00 Introduction
0:46 Cabin Heating Method 1. The PTC Coolant Heater
3:30 Cabin Heating Method 2. The PTC Air Heater
5:07 Cabin Heating Method 3. The Heat Pump
6:45 How to determine if your Tesla has a heat pump
7:25 The advantages of using a heat pump
8:26 Coefficient of Performance (COP)
9:55 Operation above 10 degrees C (50 F) with 16 different heat sources
11:15 Heat Source 1. The Cabin Condenser
14:23 Heat Source 2. The Blower Motor
15:51 Heat Source 3. The Radiator
18:46 Heat Source 4. The High-Voltage Battery
19:50 Heat Source 5. The DC-to-DC Converter inside the Power Conversion System
20:48 Heat Source 6. The Onboard Charger Converter inside the Power Conversion System
20:48 Heat Source 7. The Autopilot Computer
22:58 Heat Source 8. The Chiller
25:43 Heat Sources 9 and 10. The Front and Rear Drive Unit Inverters
26:58 Heat Sources 11 and 12. The Front and Rear Drive Unit Stators
28:52 Heat Source 13. The Cabin Air
30:18 Heat Source 14. The Liquid Cooled Condenser (LCC)
33:19 Heat Source 15. The Air-Conditioning Compressor
35:03 Heat Source 16. Hot high-pressure vapor recirculated into the receiver dryer through a mister.
37:11 Operation below 10 degrees C (50 F) with 6 additional heat sources
37:30 Additional Heat Source 1. The Air-Conditioning Compressor operating in Lossy Mode
39:00 Additional Heat Source 2. The Blower Motor operating in Lossy Mode
39:27 Additional Heat Sources 3 and 4. The Front and Rear Drive Unit Inverters operating in Lossy Mode
39:58 Heat Sources 5 and 6. The Front and Rear Drive Unit Stators operating in Lossy Mode
43:22 Understanding the coolant side and refrigerant side of the supermanifold.
43:40 Visualizations of all four modes of supermanifold coolant flow in Service Mode.
44:08 Visualization of the supermanifold refrigerant flow, pressure, and temperature in Service Mode.
44:50 The basic air-conditioning refrigerant loop and the supermanifold.
47:34 The three pressure-temperature sensors.
48:40 The Receiver/Dryer/Accumulator with a desiccant bag.
51:02 The three one-way refrigerant check valves (Evaporator, LCC, Cabin Condenser (CC)).
53:00 The six electronic expansion valves (EXV) Stepper Motors (Chiller, Evaporator, Left CC, Right CC, LCC, Recirculation).
56:26 The LCC Shut-Off Valve Solenoid (On/Off)
58:04 The Chiller
58:38 The Liquid Cooled Condenser (LCC)
59:36 The components of the coolant control portion of the supermanifold.
1:00:35 The two coolant pumps (HV battery and Powertrain)
1:01:50 The octovalve
1:03:01 The coolant flow in parallel mode through the octovalve.
1:03:50 The coolant flow in Series Radiator Bypass mode through the octovalve.
1:04:31 The coolant flow in Ambient Source mode through the octovalve.
1:04:56 The coolant flow in Series mode through the octovalve.
1:06:48 Connecting the two sections of the supermanifold together
1:07:58 The coolant Reservoir
1:09:45 Heat pump summary
ABOUT US
Weber State University (WSU) Davis Campus - Automotive Technology Department - Advanced Vehicles Lab. A technical description and operational demonstration of the Tesla heat pump system.
We teach current vehicle technologies to our automotive students at Weber State University and online. For more information, visit: http://www.weber.edu/automotive
This video was created and edited by Professor John D. Kelly at WSU. For a full biography, see http://www.weber.edu/automotive/J_Kel...
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