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How to operate refrigeration equipment more energy&efficient?

To control and reduce the operating cost of cold storage, during the operating of refrigeration equipment, it is necessary to consider “oil, fluorine, water, and electricity”; it is necessary to reasonably adjust the operating parameters of the refrigeration system to increase the efficiency of the equipment. The evaporating pressure, temperature and condensing pressure of the refrigeration system are the main parameters, and are important basis for operation and adjustment. According to the actual conditions and system changes, the operating parameters are continuously adjusted and controlled to run under economically reasonable parameters, and the machine and products can be guaranteed. and increasing refrigeration equipment efficiency, and save water, electricity, oil and so on.

How to reduce the operating costs of cold storage?

1, prevent evaporation temperature is too low

When the temperature difference between the evaporation temperature and the room temperature increases, the evaporation temperature will be too low, which will result in a decrease in the coefficient of performance and an increase in energy consumption. It is estimated that with other conditions unchanged, when the evaporation temperature is reduced by 1°C, it will consume 1~2% more power. In addition, the increase in temperature difference will also increase the dehumidification capacity of the cooling fan, and the humidity in the cold storage will decrease, which will result in increased loss of moisture and decrease in food quality.

The reason of evaporation temperature is too low and the solution:

(1) The evaporator is too small

Design problem, or the actual products type is different from the design plan, and the heat load increases. For example, the cold storage of apples is intended to be used for storage instead of garlic sprouts. Since the harvest time of garlic sprouts in a production area is only a few days, it is impossible to achieve a daily purchase volume of 5% to 15% of the storage capacity as that of Apple, instead of filling up 3-5 days. Therefore, if the temperature should be lowered to the proper storage temperature in time, it can only be achieved by lowering the evaporation temperature. Increase evaporator evaporation area or replace evaporator.

(2) The compressor capacity is too large

When the cold storage load was reduced, the energy of the compressor was not reduced in time. The compressor of the cold storage is matched according to the maximum load of the refrigeration system, At most times, the load of the compressor is less than 50%. When the room temperature is reduced to a suitable storage temperature, the system load is greatly reduced. If a large machine is still turned on, a large horse-drawn cart is formed, and the temperature difference increases, and the power consumption increases. The number of compressors to be turned on or the number of cylinders to be operated should be reduced according to changes of cold storage load.

(3) The evaporator  not defrosting in time

The frosting of the evaporator coil causes the heat transfer coefficient to become smaller, the thermal resistance increases, the heat transfer effect is reduced, and the evaporation amount of the refrigerant is reduced. Under the condition that the compressor energy is constant, the evaporation pressure of the system will decrease, and the corresponding Evaporation temperature decreases, so should defrost in time.

(4) Lubricating oil in evaporator

The lubricating oil in the evaporator will form a layer of oil film on the wall of the evaporating coil, which will also reduce the heat transfer coefficient, increase the thermal resistance, reduce the heat transfer effect, reduce the evaporation amount of the refrigerant, and cause the evaporation pressure of the system to decrease. The corresponding evaporation temperature is reduced, so the system oil should be drained in time.

(5) The expansion valve is opening too small

When the expansion valve is opened too small, the amount of liquid supplied by the system is small. Under the condition that the energy of the compressor is not changed, the evaporation pressure is reduced, causing the evaporation temperature to decrease, and the opening degree of the expansion valve should be increased.

 

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Summer season is coming, how to operate cold storage correctly?

The frequency of using cold storage in the summer is high, and refrigeration equipments are all under high-load operation. If the owner does not pay attention to maintenance and repair, the cold storage is more prone to failure. What are the things we should pay attention to when we use cold storage in summer?

When the cold storage must be work in 24 hours in summer, the maintenance of the cold storage is important at this time. Regularly add lubricant to the cold storage refrigeration unit, check the working condition of the equipment regularly, and find that the damage will be repaired immediately. If not repair, hurry to replace.

The precautions lists as below:

1. Provide enough outdoor air to the compressor unit. The hot air discharged from the condenser should be kept away from the compressor unit and it must not be allowed to form hot gas circulation.

2. Minimize the switching frequency of cold storage doors. Because the outdoor air temperature in summer is high and the convection between hot and cold is intense, on the one hand it is easy to lose a large amount of cold inside the cold storage, and on the other hand, it is easy to cause a large amount of condensation inside the cold storage.

3, Check the cold storage control system wire and cable and various electrical components oftenly.

4. Check the radiator of the air-cooled unit and clean the dust on the radiator.

5. Check the ventilation environment of the air-cooled unit to ensure that the hot air discharged by the unit can be emitted in time. When the ambient temperature is too high, spraying water to the radiator fins to help dissipate heat and improve the cooling effect.

6, Strictly control the loading in products,  a time can not exceed 30% of the storage capacity, so as not to cause the long operating hours of refrigeration equipment, and the room temperature decreased slowly.

7. The cooling water in the water cooled unit should preferably not exceed 25°C. When the temperature exceeds 25°C, tap water is replenished in time.

8. Check whether the water flow of the cooling water pump is normal and whether the fan of the cooling tower is rotating forward (hot gas rises upward). Change the circulating water frequently to keep the water clean.

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Why can’t buy cheap refrigeration equipment?

In recent years, as companies have become more powerful and customer requirements have increased, more and more factories will choose the latter between price and quality when they purchase refrigeration equipment. But there is some factory chooses a cheaper one, cheaper one will save your cost really? Let’s talk about why we can’t buy cheaper ones.

1. Buying cheap equipment
Only happy at the moment you kill the price! When you use it, it is probably not happy once time. The cheaper thing, its total cost may not be low, just make up for the money saved in other areas.

2. Buying the best quality
The moment of giving money is distressed! Every day you are happy, it feels especially worthwhile. For many years, the equipment has not been repaired, there is a minor problem, and the manufacturers do very well service after the sale.

3. Customers are struggling to reduce prices and calculate costs
Customers always think that we charge a high price, we desperately lower prices, and calculate costs with me. I would very much like to ask him: “Do you forget the cost of designing? the cost of labor ? the cost of marketing ? Does the company’s normal operating costs account? Is the cost of management justified? Is the cost of logistics calculated? Is the cost of storage calculated?…”

4. The premise of service is profit
The premise of service is profit, each company must survive, profits can be reduced properly but can not disappear, you take away all the profits to protect survival, who will gurantee the quality of refrigeration equipment, after-sales service?

5. The quality of the product for your choice
It’s expensive, yes, because it’s good, so expensive! Products are expensive in quality, people are in taste! The quality of the product lies in your choice! The world can buy the best products without spending the least money.

6. Perfect Pursuit, Quality First
Someone asked: “your refrigeration equipment will be cheaper?”
I can only say: “I can’t give you the lowest price. I can only give you the highest quality. I would rather explain the price for a while than to apologize for quality for a lifetime.”

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Do you know the cold room storage refrigeration RT-HP-KW and unit conversion?

cold room storage refrigeration RT

A ton of refrigeration (TR), also called a refrigeration ton (RT), is a unit of power used in some countries (especially in North America) to describe the heat-extraction capacity of refrigeration and air conditioning equipment. It is defined as the rate of heat transfer that results in the melting of 1 short ton (2,000 lb; 907 kg) of pure iceat 0 °C (32 °F) in 24 hours.

A refrigeration ton is approximately equivalent to 12,000 BTU/h or 3.5 kW. Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in “tons” (of refrigeration). Many manufacturers also specify capacity in BTU/h, especially when specifying the performance of smaller equipment.

HP
The calculation of the horsepower (HP) horsepower cooling capacity is calculated in terms of kcal or tile (W). In general, 1PH=2000 kcal, and the international unit calculates to multiply by 1.16. So 1PH = 2324W.
In daily life, 2500W is used as the standard 1PH.

23 represents a small one; cooling area 10-14 square meters.
26 stands for 1 horse; the cooling area is 14-18 square meters.
32 stands for 1.5 horses; cooling area 18-22 square meters.
35 represents 1.5 horses; cooling area 22-25 square meters.
1P–2200-2600W; applicable area 12-15 square meters.
1.5P–3000-3800W; applicable area is about 18 square meters.
2P–4000-5500W; applicable area is about 28 square meters.

POWER

Power refers to the work done by an object in a unit of time, that is, the power is the physical quantity that describes the speed of work. The amount of work is certain, and the shorter the time, the greater the power value. The formula for power is power = work/time. The power used to describe the speed of work, how much work done per unit of time is called power.

unit conversion

1 US ton of cold = 3024 kcal/h (kcal/h) = 3.517 kW (kW)
1 Japanese cold ton = 3320 kcal/h (kcal/h) = 3.861 kilowatts (kW)
1 hp (or 1 horsepower) = 735.5 watts (W) = 0.7355 kW (kW)
1 kcal/h (kcal/h)=1.163 watts (W)
Celsius °C = (Fahrenheit °F-32) 5/9
1HP = 2.5kW = 735.5W: Note: 2.5kW corresponds to cooling capacity, while 735.5W corresponds to electrical power;

Common conversion formulas:

1 kJ (kJ) = 0.239 kcal (kcal)
1kcal = 4.19kJ (kilojoules)
1kcal=3.969Btu
1Btu=0.252kcal
1kcal=427kg.m
1kW=860kcal/h
1 U.S. cold tons = 3024 kcal/h = 3.51 kW
1 Japan cold tons = 3320kcal/h = 3.86kW
For example, a 40kW air conditioner has a cooling capacity of 40*860=34,400 kcal.
Civil air-conditioning likes to (H) P as a unit, 1 (H) P = 0.735kW, general energy efficiency ratio of 3.2, and the cooling capacity of 2352W, converted into a large card is about 2022 kcal.
It can be said that the 1(H)P air-conditioning capacity is 2000 kcal.

0C cold room storage matching evaporator:

Each cubic meter load is calculated as W0=75W/m3.
1. If the V (cold storage volume) is less than 30 m3, and the number of times the door is opened frequently, such as fresh meat, the multiplier coefficient is A=1.2;
2, if 30m3 ≤ V <100m3, open more frequent cold storage, such as fresh meat, then the multiplier coefficient A = 1.1; 3, if V ≥ 100m3, open more frequent cold storage, such as fresh meat, then the multiplier coefficient A = 1.0; 4, if a single cold storage, then the multiplier coefficient B = 1.1 final cold storage cooler matching according to W = A * B * W0 (W is the cooling fan load); 5, cold storage refrigeration unit and cooling fan match according to -10 degree evaporation temperature calculation. The above calculations are reference values and the calculations are based on the cold storage load calculation table. -18C cold room storage matching evaporator:

The load per cubic meter is calculated as W0=70W/m3.
1. If the V (cold storage volume) is less than 30 m3, and the number of times the door is opened frequently, such as fresh meat, the multiplier coefficient is A=1.2;
2, if 30m3 ≤ V <100m3, open more frequent cold storage, such as fresh meat, then the multiplier coefficient A = 1.1; 3, if V ≥ 100m3, open more frequent cold storage, such as fresh meat, then the multiplier coefficient A = 1.0; 4, if a single freezer, then the multiplier coefficient B = 1.1 final cold storage cooler matching according to W = A * B * W0 (W is the cooling fan load) 5. When the cold storage unit shares the refrigeration unit with the low temperature cabinet, the unit and the cooling unit are matched by the -35 degree evaporation temperature. Processing Room Cold storage matching cooling fan:

The load per cubic meter is calculated as W0=110W/m3.
1, if V (volume between processing) <50m3, then the multiplier coefficient A = 1.1; 2, if V ≥ 50m3, then the multiplier coefficient A = 1.0 final cold storage cooler matching according to W = A * W0 (W is the cooling fan load); 3. When the processing room shares the refrigeration unit with the medium temperature cabinet, the unit and the cooling fan are matched according to the -10oC evaporation temperature. When the processing room is separated from the medium temperature cabinet, the cold storage unit and the cooling fan are matched according to the 0oC evaporation temperature. The above calculations are reference values and the calculations are based on the cold storage load calculation table.

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Notice for cold room/cold store usage

Atlascool Refrigeration-your cold room experts

1, Do not lay the wood floor in the cold store, they will occupy more areas and inconvenient to clean;

2, Make sure to close the door when someone get in or out, it will reduce the cold air flow away and loss, avoid the temperature fluctuation is too much and keep the food fressness at any time;

3, Do not put more watery food in the cold storage; in order to avoid the situation with excessive humidity causes the frost blocked the ceiling air cooler frequency;

4, Notice for opening and closing the door; do not use the foot to kick or vehicle to rush. Avoid destroying the door lock or pivot with wrong way;  it will influence the normal use of cold store;

5, Do not dircetly promote the library carts. Avoid the weight, while the damage casued by the floor.