A LOW CARBON DEFROST SYSTEM Tom DAVIES, Robin CAMPBELL, Varun THANGAMANI Frigesco Ltd., Innovation Centre, University of Exeter 15 th.

Slides:

Advertisements

Similar presentations

Basic Refrigeration, Its Components, and Its Cycle

Advertisements

Changes in the state of matter

Starter Question If you touch two objects that are the same temperature, why would one feel colder than the other?

Air Conditioners and Heaters

HEATING AIR © Commonwealth of Australia 2010 | Licensed under AEShareNet Share and Return licence.

100% Outside Air and Dehumidification Management

How Refrigerators and Freezers Work

PHASE CHANGES SECTION 3.3.

Refrigeration Flow Control

Change of Phase Evaporation Condensation Fogs and Clouds Boiling Melting and Freezing Energy and Change of Phase.

Section 3.3 – Phases Changes

3.3 Phase Changes.

Section 16.3 Using Heat.

C oncerns Ltd ool Energy Efficient Refrigeration Jane Gartshore, Cool Concerns Ltd.

Phase Changes What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

Is it possible to transfer heat to a substance and it not increase in temperature? Yes, during a phase change.

Phase Changes What did one water molecule say to another water molecule about vapor? Don’t worry it’s just a phase he’ll cool down.

Product Introduction.

Phase Changes Melting Vaporization Condensation Freezing Sublimation.

REFRIGERATION SYSTEMS

COMMERCIAL REFRIGERATION

Lecture 30 Heat Pump Systems.

Thermal Energy (Heat) Temperature (°C) Notes: Thermal Energy and Phase Changes.

General Troubleshooting Tips.

Energy and States of Matter Heating and Cooling Curves.

Heat Energy and Changes of State. Matter may exist as a solid, liquid, or a gas.

Please take your notebook out and take your hats off Science 14 and 10-4 with Mrs. Martin 5.5 Heat Transfer Technologies.

Section 10.3 Using Heat. Heating System Heating Systems: Def. p Work can be done to increase temperature. Example of this is when you rub your.

Introduction to Defrost

State Changes How matter changes forms. What is energy?  Energy is the ability to do work or cause change.

Defined shape Defined volume Fixed Particles tightly packed Particles vibrate in their places Defined volume Takes the shape of the container Particles.

REFRIGERATION SYSTEMS

What are changes of state?

Thermal Physics III Cooling Processes Refrigerators, air conditioners, and heat pumps are devices that make heat flow from cold to hot. This is called.

Section 3 Using Heat.

Heating Curves. Energy and Phase Change When adding heat to a solid, energy added increases the temperature and entropy until the melting point is reached.

HEAT PUMPS BY: DINESH BAKTHAVATSALAM ID#: M-I.

Heat and Work.  Thermodynamics looks at how changes in energy, work and the flow of heat influence each other.

2 types of Heat Energy Kinetic Energy – is energy in motion. Temperature is the average KE of molecules Potential Energy – is energy in storage aka latent.

President UniversityErwin SitompulThermal Physics 10/1 Lecture 10 Thermal Physics Dr.-Ing. Erwin Sitompul President University

1 Second Law of Thermodynamics Engines and Refrigerators.

Energy for Heat Transfer. 1 st Law of Thermodynamics Whenever heat flows into or out of a system, the gain or loss of thermal energy equals the amount.

Second Nature ® Compact Chiller Leading the way in secondary coolant refrigeration systems. SNCC.

Evaporation vs. Condensation, energy flow, Warming vs. Cooling

This model best represents which phase of matter? Solid, liquid, gas, plasma.

Insulators vs. Conductors Conductors transfer thermal energy rapidly (metals) Insulators reduce the transfer of thermal energy (wood, foam) Insulation.

Refrigeration What's Refrigerated? What makes up a system?

Using Heat Part 2. Science Journal Entry 32 Explain the advantages and disadvantages of thermal expansion.

Best practice small scale commercial refrigeration, optimisation strategies and simple maintenance Michael Bellstedt, Minus40 Pty Ltd.

Automotive Heating and Air Conditioning, Fifth Edition By Tom Birch © 2010 Pearson Higher Education, Inc. Pearson Prentice Hall - Upper Saddle River, NJ.

Water is a substance that is found on earth and in the atmosphere in all three phases of matter.

Phase Changes Physical Science

REFRIGERATION SYSTEMS Er. Gagandeep kaur Associate Prof., Electrical Engg. PTU Giani Zail Singh Campus, Bathinda. Id:

WELCOME. Glycol Refrigeration A most basic definition of refrigeration is taking heat from someplace we don’t want it and moving it to someplace where.

SNS COLLEGE OF ENGINEERING Coimbatore-107 Subject: Thermal Engineering

. Level 3 Air Conditioning Inspections for Buildings

Automotive Air Conditioners

SNS COLLEGE OF ENGINEERING Coimbatore-107 Subject: Thermal Engineering

______________ Combustion Engine

R3 Controls, Valves, Accessories & Heat Pumps

Lecture 30 Heat Pump Systems.

Air Treatment School Refrigerated Dryer Training

How Refrigerators and Freezers Work

Presentation transcript:

A LOW CARBON DEFROST SYSTEM Tom DAVIES, Robin CAMPBELL, Varun THANGAMANI Frigesco Ltd., Innovation Centre, University of Exeter 15 th Intnl Refrigeration and Air Conditioning Conference, Purdue, 2014

EXISTING DEFROST METHODS Electric Hot gas Cool gas Warm liquid Reverse cycle ALL USE EXTRA ENERGY TO MELT ICE AND THEN TO RE-CHILL Some use thermal storage

FLASH DEFROST REQUIRES A HEAT STORE INSERTED IN THE LIQUID LINE LEAVING THE CONDENSER REQUIRES 3 SOLENOID VALVES + PIPEWORK DOES NOT USE EXTRA ENERGY

NORMAL OPERATION & HEAT STORE ON CHARGE

SUBCOOLING DURING CHARGE

START OF DEFROST

EVAPORATOR TEMP DURING DEFROST

HEAT STORE DEPLETED

HEAT STORE RECHARGED

POSSIBLE COLD CHAIN APPLICATIONS LARGE SYSTEMS – WAREHOUSES TRANSPORT SYSTEMS SUPERMARKETS AND CONVENIENCE STORES – WALK-INS RETAIL DISPLAY CABINETS (RDCs) DOMESTIC FREEZERS ______________________________________________ PLUS AIR SOURCE HEAT PUMPS

TESTS ON: Supermarket retail display cabinets - 4.8m worldwide. Cold Rooms - over 2.5m worldwide, 900k in large supermarkets, 300k in fast food (MacDonalds, Starbucks, etc) plus hospitals, schools, restaurants. Air source heat pumps, rapidly growing market. Over 2m units sold in Europe in 2010.

RDC TESTS 2.6m HALF GLASS DOOR PLUS OPEN WELL (R404A) BOTH REFRIGERATION CIRCUITS MODIFIED TO TAKE HEAT STORE MODULES COULD BE RUN WITH EITHER ELECTRIC DEFROST OR FLASH DEFROST 24hr TESTS TO COMPARE ENERGY CONSUMPTION TO EN23953:2005 STANDARD AT CC3. FLASH DEFROST REDUCED ENERGY CONSUMPTION BY 40% WITH 6 DEFROSTS PER DAY.

RDC TESTS – AVERAGE PRODUCT TEMPERATURES

WALK-IN TESTS 8m 3 STOREROOM WITH SIMULATED LOADS REFRIGERATION CIRCUIT MODIFIED TO TAKE HEAT STORE MODULE (R404A) COULD BE RUN WITH EITHER ELECTRIC DEFROST OF FLASH DEFROST 24hr TESTS TO COMPARE ENERGY CONSUMPTION FLASH DEFROST REDUCED ENERGY CONSUMPTION BY 20%

ELEMENTS OF WALK-IN RIG

WALK-IN TESTS – PRODUCT TEMPERATURE SWINGS

DAILY ENERGY CONSUMPTION RDCElectric defrostFlash defrost DEC (KWh/24h) REC RC (KWh/24h) TEC (KWh/24h) WALK-INElectric defrostFlash defrost TEC (KWh/24h)360288

BENEFITS OF FLASH DEFROST Flash defrost eliminates the use of electrical power for melting ice Flash defrost limits the temperature rise in the air coil Flash defrost reduces temperature rises in the product Flash defrost reduces energy consumption in post-defrost re-chilling phase Flash defrost creates the opportunity to operate at higher evaporator temperatures Flash defrost allows more frequent defrosts

Questions? —