KoolJet Reliable Refrigeration Systems
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Faq

Please view below our most frequently asked questions regarding our systems and how they work.

Q: Is there a standard refrigeration system for a standard sized storage?

A: No… the capacity of the refrigeration system needs to be matched to the crop, building and storage conditions.

Q: Why should I buy KOOLJET Refrigeration System one-piece through-the-wall design?

A: KOOLJET‘s one-piece, self-contained design has several advantages over a two piece system. These include:

  1. KOOLJET Systems are NOT off the shelf products. Each system is custom designed. We evaluate the actual requirements of the customer and then create a specific system to match their needs.

  2. KOOLJET Systems are one-piece and self-contained which means all the components are on one common platform. This makes the system efficient and reliable.

  3. Being self-contained, there are no long pipe runs. This makes the systems more efficient, consuming less energy, using a lower mass of refrigerant, having higher Energy Efficiency Ratios, higher Co-efficient of Performance, fewer oil return problems, etc.

  4. In case of a refrigerant leak,  KOOLJET Systems are more economical to recharge as compared to conventional two piece systems, since they use less refrigerant.

  5.  Easy to install and remove.

  6. Portable design – can be relocated.

  7. Ease of Service. With KOOLJET Systems convenient access panels, it is much easier to detect and repair problems such as leaks, versus a two piece system.

Q: What are the advantages of SCROLL compressors?

A:  KOOLJET Refrigeration Systems incorporate Scroll compressors for high and medium temperature applications. Some of the advantages of scroll compressors include:

  1. Scroll compressors are more Energy Efficient, which means greater cooling capacity with lower energy use. They are the only compressors in the industry which have an Energy Efficiency Ratio of 12 and higher.

  2. Quiet Operation – makes scroll compressors desirable. They are THREE times quieter than reciprocating compressors.

  3. Greater Reliability – with only THREE moving parts, versus reciprocating compressors that have at least 15 moving parts.

  4. Compact Size – Scroll compressors are 40% smaller than comparable capacity reciprocating compressors.

  5. Greater Life Expectancy – approximately 38% greater than reciprocating compressors.

  6. Liquid Handling Capability – Scroll compressors have more liquid handling capability than reciprocating compressors, which translates into fewer failure rates.

Q: Are KOOLJET Refrigeration Systems current with government refrigeration standards?

A:  Of course yes. We take every possible measure to keep the systems compliant with the latest standards. From fabrication, testing, until the final commissioning, we use products, which are approved by the government. For leak testing, we use the inert gas nitrogen, which is not damaging to the environment.

Refrigerants such as R-22, R-134a & R-404a are currently approved by the government.KOOLJET chooses refrigerants for their high energy efficiency, high refrigeration capacity, zero flammability, low toxicity, zero Ozone Depletion Potential (ODP), very low global warming potential (GWP) and low total equivalent warming impact (TEWI).

Q: Why is R-Value important in cold room design?

A:  The amount of insulation necessary depends on the atmospheric climate and the level of indoor cold room temperature. Insulation is rated by its R-value, which measures its thermal resistance to heat flow, or how well it holds back heat. It is important to know the R-value because it gives a minimum amount of thermal resistance on buildings. Higher R-values translate into better insulating, which means greater energy savings and greater cost savings. R-value is proportional to the insulation’s thickness, but it also depends on the type of material and its density. Sometimes the C-value is used to measure the thermal conductance of the material and is the reciprocal of R.

Q: Why is high humidity essential for fruit, vegetable and flower storages?

A: Fresh fruits, vegetables, and flowers are highly perishable because they are alive. They “breathe,” release heat from respiration, and consequently lose moisture. In fact, freshness is water. By loosing moisture they can become sick, deteriorate and eventually die. More over water loss represents weight loss and reduced profits. Humidity plays a very important role in the storage of perishable fruits and vegetables. It helps them to maintain extended shelf life, which allows products to reach more distant markets, stay in excellent condition, maintain excellent quality and attain maximum shelf life. All of this means maximum profits for you.

The degree of humidity affects the quality of fruits and vegetables. If the humidity is too high, mould may appear and if it is too low, products may sag or shrink. Most fruits and vegetables have a moisture content of approx 90%. So they benefit from a relative humidity of 90 per cent or higher. The normal respiration of most products will result in a relative humidity level of around 90%. However, for certain products, it is beneficial to increase the humidity to 95-98%.

Q: Who can benefit from a KOOLJET Refrigeration System?

KOOLJET Systems one-piece designs are fabricated, assembled and thoroughly tested at the factory. During manufacturing, you simply prepare the wall opening per the specifications of the system. It is just like adding a window frame to an existing structure or new building.

If the position of the system will be higher then the ground level, a forklift or crane will be required to place the system in the opening. Then an electrician will make the final power connection.KOOLJET will send a refrigeration technician to do the initial start-up.

In comparison to two piece systems, there is a substantial savings in labour costs. Two piece systems involve hanging the indoor portion, making a frame/platform for the outdoor portion, connecting and brazing the copper lines, evacuating the system, charging, testing and finally commissioning the system. This would all happen at your location, versus the simple installation of aKOOLJET Refrigeration System.

Q: When and why is Evaporator Defrosting necessary?

A: Adding heat to the evaporator coil to eliminate frost is called Defrosting. The Evaporator coil surface needs to be clean from scale, dirt and FROST. These elements acts as insulation and impair heat transfer, affecting the systems efficiency. This will increase the electricity usage to produce the cooling effect, increase wear on the system and increase moisture loss from the product.

Frost is frozen water vapour coming from the air as it passes over the evaporator surface. It forms when the evaporator coil surface is below 32ºF. The colder the evaporator, the more the water vapour will freeze out of the air. Removing this frost from the surface is essential, thus defrosting is required.

    1. KOOLJET Refrigeration Systems use two main defrosting techniques.
      AIR DEFROSTING: This is typically used when the room temperature is set at or above 39°F/4°C. At an adjustable, preset time, the system will go into a defrost cycle. During the defrost cycle, the evaporator fans are kept running. This method utilizes the room air, which is above freezing temperature, to defrost the ice on the coil surface. When the sensor in the Evaporator coil senses that the coil is frost free, the defrost cycle ends and the cooling cycle begins again.

 

  1. HOT GAS DEFROSTING: This method is typically used on systems operating in room temperatures below 39°F/4°C. During the automatic Hot Gas Defrost cycle, the hot vapors from the compressor are temporarily directed into the evaporator coil. This operation is set to activate long enough to melt away any frost/ice that may have formed. During the Hot Gas Defrost Cycle, the evaporator fans are shut down to prevent the circulation of hot air into the cold room. Once again, when the sensor in the Evaporator coil senses that the coil is frost free, the defrost cycle ends and the cooling cycle begins again.

 

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