Counter Depth Refrigerator Basics

One of the most inexpensive marine refrigeration device and easiest to put in is the 12 v or DC device. Air cooling is the handiest. The DC device combined with an evaporator plate this is thermostatically controlled offers flexibility over cooling requirements. Many 12 volt structures use the Danfoss compressor. With the multiplied performance of the Danfoss compressor, DC refrigeration onboard is getting greater efficient, but remains strength hungry.

For most boats with a small field, a unmarried 12V compressor, air-cooled condenser, with evaporator type plate may be approximately the cheapest option. The Adler Barbour Cold Machine has been around for round 25 years and presents top notch refrigeration for small to medium size ice boxes.

Shore powered marine refrigeration

Shore powered systems are made to hold the boat’s ice container at set temperature when the boat is at the dock. They offer less strength than direct from an engine power however due to the fact that you’ll be at the dock for some time that isn’t always an difficulty.

If you operate a protecting plate and shore powered Sub-Zero refrigerator repair Orange County  device you may preserve the plate cool at the same time as far from the dock for 12 hours or so.

Engine powered marine refrigeration

The concept behind an engine driven compressor system is that the engine receives used anyway for at lest an hour or so. If you’re Power boating this makes feel, if you are sailing calculate how much time you use the engine.

If that is the case an engine force with a holding plate can draw down the ice field in a brief period and after that it could be left for 12 plus hours.

The compressor is run without delay off the engine. Belt driven or direct compressor, There are two plates and you can upload greater, plus upload a separate freezer unit. This creates strength and speedy cooling of the preserving plate. More strength than a a hundred and ten volt system. Larger systems and multiple plates are possible. Engine driven systems value greater and additionally contain a labor better value

Condenser Cooling

The marine refrigeration systems condenser needs cooling. This is how the refrigerant receives cooled and turned into a liquid. There are three ways to cool the condenser;

Air Cooled

Air cooling simplifies installation plus it does now not rely on water or including via hulls. It is consequently the cheapest installation. For smaller units air cooling is OK, say four cu feet or below 6 cu ft you will get ok performance. The air cooling unit needs a enough deliver of re-circulated air for it to work. Ducting and space around the unit will assist this.

When you cool by way of air drift you put off warmth from the condenser and add it to the ambient temperature. The temperature inside of the cabin simplest has sufficient capacity to disperse this heat.

Water cooled Condenser

Water cooled compressors will paintings higher in better ambient temperatures and are extra green and can be 30% more efficient. Water cooling can be satisfactory and is better for larger installs especially if freezer is involved. Water cooling needs a via hull and a pump to get the water to the condenser. The most green way to cool the condenser

Keel cooler Condenser

The keel cooler or keel condenser calls for no via hull becoming and will not be issue to clogging. The keel cooler is a three” x 7″ bronze plate that mounts at the outside of the hull and it’s miles the condenser heat exchanger. The bronze plates are connected direct to the compressor that’s the best shifting part within the machine. The Keel Cooler is for a field as much as a fifteen cu feet fridge or 5 cu feet freezer. Since all the heat is exceeded into the water outside the boat it’ll does not warmth up the interior. Since it really works with out a water pump there’s never a pump or strainer to maintain and first-class of all it is almost silent in operation.

Refrigeration Compressor & plate Combination

Before we choose a length of marine refrigerator we want to understand what elements are worried in keeping the refrigeration box cool. They are in particular container length, insulation and cooling water temperature, quantity of people aboard and the temperature you’re placing the plates for.

Refrigerator Box Volume

This is apparent, the larger the container the extra heat removal is essential. A larger field will need extra BTUs of warmth removal. After this simple length issue we’ve such things as, Front establishing or pinnacle opening. Front starting lets cold air out fast however does assist you to get to the lowest of the box. Drains, in case you had a drain for you ice container plug it. You will no longer need to drain water out of the ice field and this will best allow cold air out and heat in. Gaskets, are a have to. A trick to identify if there are gaps within the gasket is to position a piece of paper in between the lid or door and the cabinet and near it. Pull at the paper and you have to feel some drag if the gaskets are sealing well. It comes out without difficulty there is an opening. Get new or better gasket material.


Typical insulation to a fridge or freezer is foam insulation like Dow Blue board. The recommendation is for three-four inches for refrigeration and 4-6 inches for freezer for medium sized containers. Foam has an R cost of 5 per inch thickness, R being a thermal unit. This way in phrases of thermal units 3-4 inches represents 15-20R value for the refrigeration unit, and 20-30 for the freezer.

There are producers of vacuum panel thermal insulation. The Glacier bay Barrier Ultra-R top notch-insulation at R-50 per inch provides lots of insulation without taking up valuable volume. These panels are vacuum panels and are sealed to work. It could be very vital which you do now not drill via or puncture those panels. These panels are custom made, so that you could want to provide the producer, actual sizes with locations for copper plate tubes to go into the box. These are built into the panels.

Water temperature

In the tropics water temperature is a lot hotter than northern climates. For each diploma water temperature will increase a corresponding 2 % increase in required BTU. If you’re within the Atlantic portions of the east coast US, you have got some cool sea water temps, but of then you definitely cruise right down to the Caribbean you may pressure your refrigeration system.

Plate Thermostat

The evaporator plate temperature is set by using the thermostat. Dial the container temperature down and the system will ought to work tougher.

Number of human beings aboard

More people way the container receives opened extra and the heat building up from extra humans provides to the ambient temperature.

How large a Refrigeration System?

To calculate how massive a refrigeration or marine freezing unit required, you’ll need initially an estimation of the BTU necessities of the container. A easy rule of thumb for estimating the BTUs is primarily based on the box volume.

These BTU estimations are based totally on these assumptions;

– Insulation has an R price of 30 no leaks.

– Water temperatures are tropical in the mid 80s F.

– 2 humans aboard, for every greater person add an additional 1,000 daily BTU

– Top commencing field, for a the front opening door upload 15 BTU/inch of door

BTU estimate on refrigeration quantity;

Refrigerator every day warmness load; six hundred BTU in step with cu. Feet.

Freezer day by day heat load; 1200 BTU in line with cu. Ft

Lets examine how this works for the four cu ft refrigeration gadget, the use of the above method

4 cu. Toes. Instances six hundred = 2,400 BTU.

Two extra people on board = 2,000 BTU.

Total required according to day = 4,400 BTU

Choosing 12 volt unit with Evaporator

Match this wide variety to the compressor skills, and then calculate amps needed to electricity the machine, and then work on the battery financial institution capability. Start with the aid of using the four,four hundred BTU form the above example. The Adler Barbour Cold Machine makes use of the Danfoss BD50 Compressor is rated at 650BTU / hr based totally on 25F evaporator temp.

This is properly above the 4,four hundred/day we want for the 4 cu ft fridge, using most effective about 1/three of the power. We may want to effortlessly move down the Danfoss DB35.


To calculate how many amps the device will draw we start by using converting BTUs to amps with this components, the use of an assumption of 5 BTUs in keeping with watt hr of energy used. BTU/five/volts. So say we’ve 4400 BTUS and 12 volts, 4,four hundred/5/12=seventy four amp hours/day.
The Amps needed to electricity the compressor ought to be 1/four of the potential of the residence financial institution. So for the above 74 amp hours wanted multiply through 4 to get endorsed house battery capability = 296 amp hrs.