Project Overview
- Project Name: Casting Machine Processing
- Total construction area: 12000 m2
- Room type: steel structure workshop
- Wall body: color steel composite plate
- Heating area: 12000 m2
- Refrigeration use area: 12000 m2
- Demand for work and energy: cooling in summer and heating in winter
- Heat source equipment: water cooled chiller
- End system equipment: universal exposed fan coil unit
Design Ideas
The foundry group mainly provides precision machines and parts processing and casting for various countries, so the workshop has high requirements on environmental temperature, and the parts processing equipment-CNC machine tools have strict requirements on environmental temperature, which is too high to run normally. In addition, it is necessary to save operating costs. According to the adjustment of national energy policy and the requirements for environmental protection, the use of clean, energy-saving and efficient new energy is the main policy of the country for a long time to come. In order to meet the special requirements of workshop temperature and respond to the call of national policy, the engineers considered comprehensively that the main engine selected water chiller, and the terminal equipment matched with universal exposed floor standing or ceiling suspended fan coil unit, which not only met the special temperature requirements of processing precision machine tools, but also saved costs for production enterprises.
In this scheme, electric power is used as the clean energy source for cooling and heating. By consuming a small amount of electric energy, the low-grade heat energy in the atmosphere is converted to high-grade heat energy, and the water chiller is used to prepare cold water and hot water for cooling and heating of buildings. The utilization of this new energy can completely replace the municipal central heating and any heating methods such as coal, oil, gas and electric heating, and it can also refrigerate in summer, which greatly reduces the investment, and is not affected by the ambient temperature and does not need auxiliary electric heating. The system has strong stability, high reliability, good heating effect, environmental protection and no pollution, and no special person is needed to manage it. Under the normal working conditions of the terminal pipe network and the radiator, the indoor temperature reaches or exceeds the standard specified.
Calculation Parameters
1. Calculation parameters of outdoor design in winter
| Seasonal parameters | Average minimum temperature | Extremely cold minimum temperature | Relative humidity% | Outdoor average wind speed (m/s) | Atmospheric pressure KPa |
| winter | -7 | -15 | 55 | 1.5 | 102 |
2. Calculation parameters of outdoor design in summer
| Seasonal parameters | Average minimum temperature | maximum temperature | Relative humidity% | Outdoor average wind speed (m/s) | Atmospheric pressure KPa |
| summer | 27 | 34 | 55 | 1.5 | 102 |
Cooling and heating load calculation
Selection of water chiller, according to the Design Manual of Heating, Ventilation and Air Conditioning, the cooling and heating heat load consists of the basic cooling/heat consumption of the outer envelope and the inner envelope and its additional cooling/heat consumption and cold air infiltration cooling/heat consumption. According to the outdoor temperature parameters, the unit cooling load index is 110W/㎡, and the unit heat load index is 100W/㎡.
1. determination of cooling load;
Q1=12000×110×=1320kw
According to the characteristics of buildings and climatic conditions, the rated cooling capacity of water cooled chiller with refrigeration configuration should be ≥1320kw to meet the use requirements.
2. determination of heat load;
Q2=12000×100=1200kw
According to the characteristics of buildings and climatic conditions, the rated heat of water chiller for heating should be ≥1200kw to meet the use requirements.
System principle
Water cooled chiller absorbs a large amount of heat energy in circulating water through very little electric energy, which is compressed by compressor and changed into high-temperature heat energy. The water is transferred to heat the water, and the hot water is used for heating through fan coil unit, which can also provide cooling in summer.
Environmental protection and energy saving
The power of heating is the heat energy of circulating water, which only needs to consume a little power when absorbing the heat energy of circulating water, and the thermal efficiency is as high as 520%-780%. Compared with traditional energy sources, it not only has high thermal efficiency, but also avoids the emission of pollutants caused by the use of chemical energy, thus achieving the dual effects of energy conservation and environmental protection. The space is cooled and heated by fan coil unit, which runs as a whole and automatically adjusts the temperature, making the operation more stable and energy-saving.
Safe and reliable
By adopting physical working method, no toxic gas will be produced during the whole heating process, and no leakage accident will occur during the separation of water and electricity.
Low temperature operation
Not affected by the environment, it can be used all the year round. Whether in rainy days or cold winter, the intelligent control of heat pump unit can save manpower investment and ensure all-weather synthesis of high-temperature heat source.
