Double temperature cold water/cold air unit

Abstract

A double-temperature cold water/cold air unit belongs to the technical field of refrigeration and comprises a low temperature stage compressor, a moderate temperature stage compressor, a condenser, a high temperature stage throttle, a moderate temperature evaporator, a low temperature stage throttle and a low temperature evaporator. The invention is characterized in that the low temperature stage compressor and the moderate temperature stage compressor are arranged side by side, which suck air from the moderate temperature evaporator and the low temperature evaporator, and compress till the air reaches exhaust pressure; when used in summer, the low-temperature cold water/cold air are produced inside the low temperature evaporator and the moderate-temperature cold water is produced inside the moderate temperature evaporator; a four-way reversal valve is arranged inside the unit; when used in winter, double-temperature hot water/hot air are produced. The invention is particularly suitable for use in humidity/temperature independent control air-conditioning system that adopts the combined modes of radiation heat transfer and seperate outdoor air system, wherein the cold/hot water produced by the moderate-temperature evaporator is used for transferring radiation heat, and the cold/hot water/air produced by the low-temperature evaporator is used for processing the separate outdoor air. The invention has the advantages of simple structure, high energy-efficiency ratio, and free control of high/low temperature and cold/heat energy.

Description

technical field [0001] The invention belongs to the technical field of refrigeration and air-conditioning equipment, in particular to a dual-temperature cold water / cooling air unit used in an air-conditioning system. Background technique [0002] In order to improve the energy efficiency of the air-conditioning system and the comfort of the indoor environment, at present, the air-conditioning method of independent temperature and humidity control of "cold radiant ceiling + independent fresh air system (Dedicated Outdoor Air Systems)" has attracted more and more attention from the industry. This type of system uses medium-temperature cold water at about 18°C ​​in the cold radiant ceiling to take away the sensible heat load in the room, and uses low-temperature cold water at about 7°C in the independent fresh air system to take away the full heat load and indoor latent heat load of the fresh air, which can not only reduce air conditioning. System energy consumption, and can pr...

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Problems solved by technology

[0004] Due to different regions, building functions, and different sensible heat loads and latent heat loads at different times, the dual-temperature chiller / cooler unit is required to provide different medium and low-temperature cooling capacity, so the unit is required to have the ability to adjust the medium-temperature cooling capacity and low-temperature cooling capacity in a timely manner , and have a higher energy efficiency ratio under different operating conditions as much as possible. The technical solution disclosed in the 200410009292.1 patent adopts the series connection of compressors. Although it can provide dual-temperature cold water, it also has medium and low temperature cooling to a certain extent. However, there are still three deficiencies: (1) For the arbitrarily changing medium-temperature cooling capacity and low-temperature cooling capacity, the adjustment capacity of the unit is insufficient, especially in some occasions that only need medium-temperature cooling capacity instead of low-temperature cooling capacity When the cooling capacity is low, it is difficult for the unit to achieve effective regulation; (2) When the low-temperature cooling capacity accounts for a large proportion or even all the low-temperature cooling capacity is produced, the system form of the unit determines that its energy efficiency ratio cannot be further improved; (3 ) The unit does not have the function of producing hot water in winter, so it needs to configure other heat source systems in winter, which increases the initial investment of the air conditioning system

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