Shanghai Mutual Margin Refrigeration Engineering Co., Ltd. is a comprehensive enterprise which integrates energy-saving renovation design, installation, maintenance and after-sales service of central air-conditioning in household, commercial central air-conditioning, precision air-conditioning, ventilation, cold storage, heating, hot water, water purification and intelligent home projects.


Service hotline: 131-6609-4839


A healthy and comfortable office environment can make you more relaxed at work, while a comfortable business environment can make you refreshing and pleasant when shopping and consuming. However, with the increase of commercial and office buildings, the energy consumption of air conditioning in commercial and office buildings is also increasing, so energy saving is imperative.


Let's take a look at the solution of central air conditioning system provided by Shanghai Mutual Margin Refrigeration Engineering Co., Ltd. for commercial office building industry.

Multiplex (both refrigeration and heating)


Multi-on-line air conditioning system is commonly used in office area. It is an efficient refrigerant air conditioning system that can meet the requirements of indoor cooling and heating load timely by controlling refrigerant circulation of compressor and refrigerant flow into indoor heat exchanger. Multi-on-line air-conditioning system needs to adopt frequency conversion compressor, multi-pole compressor, unloading compressor or or multi-compressor combination to realize compressor capacity control; in refrigeration system, electronic expansion valve or other auxiliary circuit should be set to regulate refrigerant flow into the indoor machine; and by controlling fan speed product of indoor and outdoor heat exchangers. To regulate the capacity of heat exchangers.


After the technology of variable frequency speed regulation and electronic expansion valve has matured gradually, variable frequency compressor and electronic expansion valve are widely used in variable frequency multi-line air conditioning system.


The central air-conditioning system works under the condition of changing ambient temperature and indoor load, and the interaction among the components of the system, system environment and environment. Therefore, the state of the multi-online air-conditioning system is constantly changing, and the capacity of the air-conditioning system needs to be adjusted timely through its control system to eliminate its influence, which is a kind of flexibility. Sexual regulation system.

The system is generally used in functional places less than 10,000 square meters. Its advantages are simple and flexible installation, small ceiling space occupied by the system, low installation cost and low maintenance cost. Disadvantage: The equipment cost is high, the pipeline maintenance is difficult, the refrigerant pollutes the environment, and the pipeline length and drop are limited.

Screw Machine (Screw Cooling, Heating and Heat Exchange Station)


The core of screw unit is to use screw compressor. The compressor is a rotary volumetric gas compressor, which can be compressed in a single stage at low evaporation temperature or high compression ratio. The refrigeration capacity can be adjusted in the range of 10-100% by sliding valve device. The COP value of screw unit is high, but there is a certain amount of cooling loss when it is transported to the end of customers through water carrier, and it can only realize single cooling. The heating system also needs additional heating devices such as municipal heating and heat exchange stations or boilers.


The system is generally used in large-scale comprehensive functional sites. It is single-cold type and needs auxiliary heating system in winter. Its design requirements are high. Its advantages are better comfort, lower equipment cost, less difficulty in pipeline maintenance, unlimited pipeline length and drop. Disadvantages: the installation system is complex, the system occupies large ceiling space, installation costs are small, maintenance costs are high.

Air-cooled heat pump central air-conditioning system (both refrigeration and heating)


The conveying medium of air-cooled heat pump unit is usually aqueous solution. It generates air conditioning cold/hot water through outdoor main engine, which is transported by pipeline system to indoor end devices. At the end devices, cold/hot water exchanges heat with indoor air to produce cold/hot air, thereby eliminating room cold/hot load. It is a type of air conditioning system that centralizes the generation of cold/heat, but distributes the load of each room.


The indoor end device of the system is usually fan coil unit. At present, fan coil units can generally adjust the speed of their fans (or adjust the amount of water passing through the coil through the bypass valve) so as to adjust the cooling/heat input into the room. Therefore, the system can adjust each air-conditioning room individually to meet the different air-conditioning needs of each room, and at the same time, it has better energy saving. But the hot and cold water transmission and distribution system occupies a certain installation space.


The system is generally used in large-scale comprehensive functional sites, heat pump type, high design requirements, its advantages: good comfort, high equipment cost, pipeline maintenance is not difficult, pipeline length, drop is not limited. Disadvantages: the installation system is complex, the system occupies large ceiling space, installation costs are small, maintenance costs are high.

Ground temperature air conditioning (both refrigeration and heating)


Driven by electric energy, water source heat pump unit continuously extracts free energy from energy and water to meet the needs of refrigeration in summer, heating in winter and domestic hot water in four seasons. When refrigerating, heat in buildings is transferred to groundwater through heat pump units, while in heating, heat in groundwater is transferred to buildings through heat pump units. In summer, the user's heat is absorbed into the unit through the refrigerated water circulating pump, and the unit transfers the heat to the groundwater through its internal circulation. In essence, the cooling tower is replaced by energy water. Groundwater is discharged after it absorbs heat from the unit. The whole process has no consumption and pollution to groundwater. In winter, after the groundwater heat is absorbed by the water source heat pump unit, the user side water is heated by internal circulation and sent to the building for heating (also can be used for heating bath hot water). Groundwater heat is absorbed and discharged.


The system is generally used in large-scale comprehensive functional sites. The heat pump type has higher design requirements. Its advantages are energy saving, better comfort, higher cost of equipment and difficulty in pipeline maintenance.