1、 Product Introduction:< br/>
  Ultra large space constant temperature and humidity refers to providing a relatively stable space temperature and humidity environment based on the characteristics of specific equipment and items during production, testing, and storage processes. The size of the space varies depending on the requirements of production and testing processes, as well as the quantity and scale of stored items. Among them, workshop buildings, war preparedness materials, equipment warehouses, cultural relics warehouses, cultural and historical archives, etc. generally occupy a large area of ground, ranging from hundreds to thousands of square meters, with a net height of 5-7 meters for single story spaces, and some reaching more than 10 meters. Due to the large space, ensuring the accuracy and uniformity of temperature and humidity required by the design in both horizontal and vertical gradients poses a challenge for the process organization. Generally speaking, industrial workshops require purification while maintaining constant temperature and humidity, which inevitably requires a certain proportion of fresh air flow. The disturbance of temperature and humidity increases the difficulty of implementing constant temperature and humidity engineering.

2、 Purpose:

Large scale constant temperature and humidity engineering is mainly used in manufacturing production workshops, drug storage rooms, biopharmaceutical production workshops, food workshops, biological cultivation, military industry, universities, research laboratories, military supplies storage, cultural relics storage, High-end liquor storage, high-end residential buildings, etc  

3、 Design Basis:

Design Code for Heating, Ventilation and Air Conditioning GB19-87

Design Code for Distribution of General Electrical Equipment GB 50055-93

Intelligent Building Design Standard GBJ/T50314-2000

The temperature and humidity requirements provided by Party A

、 Characteristics of the design proposal

To solve the problem of balanced airflow organization in large space and large-span constant temperature and humidity warehouses, a top delivery and side return airflow organization is adopted to achieve

On the premise of meeting indoor temperature and humidity requirements, maximize the efficient use of space in the factory building< br/>  

4、 Air conditioning system design scheme

（1） Indoor and outdoor design conditions

1. Outdoor design conditions

Summer outdoor air conditioning design with a dry bulb temperature of 35 ℃

Summer outdoor air conditioning design wet bulb temperature 28.2 ℃

The average relative humidity in the hottest month of summer is 80%

The average outdoor wind speed in summer is 2.3 m/s

Design dry bulb temperature for outdoor air conditioning in winter -5 ℃

Winter air conditioning relative humidity 77%

The average outdoor wind speed in winter is 2.4 m/s

2. Design conditions for indoor temperature, humidity, and cleanliness

Indoor temperature in summer: 20 ± 2 ℃; Relative humidity: 50 ± 10%;

Indoor temperature in winter: 20 ± 2 ℃; Relative humidity: 50 ± 10%;

3. The design standard for indoor fresh air volume is ≥ 50m3/h.p

4. Positive pressure for interior design: 5-10Pa

（2） Air treatment method

1. Winter heat and moisture treatment methods

2. Summer heat and humidity treatment methods

（3） Annual operation regulation of air conditioning system  

5、 Constant temperature and humidity self-control scheme and air conditioning power distribution

（1） Overview

Due to the large area of the factory building, significant load changes, multiple temperature and humidity measurement points, and complex control equipment, strict requirements are placed on temperature and humidity parameters. In order to ensure the safe and reliable operation of the constant temperature and humidity system throughout the year, a highly reliable and high-performance constant temperature and humidity monitoring system needs to be installed. While ensuring that the temperature and humidity parameters of each laboratory meet the requirements of the commissioning letter (temperature 20 ± 2 ℃, humidity 50 ± 5% RH), energy and operating costs can be saved.

（2） Technical solution description.

This plan is based on user requirements and combined with the characteristics of the ALC system. The monitoring system is as follows:

Central Management Operating System

Constant temperature and humidity system

Cold water system