Introduction: Ten Key Points Every Refrigeration Professional Should Know

Four elements - temperature, humidity, cleanliness, and air distribution. Adjusting these four elements can control the indoor environment to meet comfort requirements.

Temperature: Cooling and heating the indoor air. This is a common requirement of users for air conditioners.

Humidity: Dehumidifying/humidifying the moisture in the air. Humidity affects the perception of heat and cold and ensures the operating environment and conditions of various devices.

Cleanliness: Removing sand and dust from the air to make it clean. This is related to human health. Additionally, special occasions such as medical settings have high requirements for cleanliness.

Air Distribution: Circulating air to reach every corner of the room. It mainly includes two aspects: air circulation and air velocity.

Comfortable Environment - Cold Shock: During summer cooling, when the temperature difference between indoors and outdoors reaches 10 °C, people will strongly feel the cold and hot air when entering and leaving the room, causing discomfort to the body. This discomfort is called "cold shock".
When cooling, the temperature difference between indoors and outdoors should be 3 - 7 °C (the standard is 5 °C).
Under no circumstances should the temperature difference exceed 10 °C.

Temperature and Humidity: In the same room, the larger the temperature difference between the dry - bulb temperature and the wet - bulb temperature, the smaller the relative humidity of the measured room.

Load: The capacity of air - conditioning equipment required for a room mainly depends on the room load.

The load includes not only the heat transfer load of the building but also the fresh - air load, heat generated by people, heat generated by equipment, heat generated by lighting, etc.

Cooling Capacity and Heating Capacity: The cooling capacity, also known as the refrigeration capacity, is the amount of heat transferred from a low - temperature object to a high - temperature object by a refrigeration machine (air conditioner) per unit time.
The amount of heat generated by an air conditioner per unit time (electric - heating type) or the amount of heat that the air conditioner absorbs from the outside and delivers to the room after heat absorption (heat - pump type) is called the heating capacity.

The unit is the same as that of the cooling capacity.

Unit: The standard unit is watt (W) or kilowatt (kW).
1W = 0.

86Kcal/h or 1kW = 860kcal/h
Ton of Refrigeration: The refrigeration capacity corresponding to the change of 1t of 0 °C water into 0 °C ice within 1 day and night (24h).
The ton of refrigeration is divided into the US ton of refrigeration and the Japanese ton of refrigeration.
1 US ton of refrigeration = 3024kcal/h = 3.526kW;
1 Japanese ton of refrigeration = 3320kcal/h = 3.860kW.

Power Consumption:
TC: Total capacity (cooling capacity or heating capacity under the corresponding ratio and indoor design temperature), kW
PI: Input power (power consumption required to produce the corresponding cooling or heating capacity), kW
When calculating the input power of an air - cooled air - conditioning main unit, the power of the fan motor should be added.

Professional Terms (Split Air Conditioners)
IPLV(C) comprehensively reflects the operating efficiency of multi - connected units under partial load. Tested according to a unified method, it can more fairly and reasonably reflect the energy - saving performance of multi - connected unit products! This version is taken from GB50189 - 2005 "Energy - efficient Design Standard for Public Buildings". The current version GB50189 - 2015 has been updated as follows:
Basic Cycle