Shanghai Construction Engineering hospital

Time of publication:2020-03-14

Basic information of Shanghai Construction Engineering hospital

The hospital covers an area of more than 40 mu and has 6500 ㎡ green space. The number of beds approved is 400, with nearly 30 clinical and medical technology departments. The number of health technical personnel accounts for 86% of the total number of employees, among which 8% have the title of deputy senior or above. The fourth and fifth floors of the second inpatient department are

The standard special ward in the hotel. The hospital also has 3.0T MRI and 128 slice CT.

Ventilation and heating requirements of operation Department

Generally, the indoor temperature of operating room should not be lower than 20 ℃ in winter and 26 ℃ in summer; the indoor relative humidity should not be lower than 30% in winter and 65% in summer; the air conditioning system or fresh air ventilation system with the end filter efficiency not lower than the high and medium efficiency filter should be adopted. Positive pressure shall be maintained indoors. The noise shall not be greater than 50dB (a).

Design of construction hospital

1. Air conditioning design of operation Department

a. The design fresh air volume of operating room is determined according to the following three principles:
(1) The need for indoor personnel to breathe.
(2) Dilute and discharge anesthesia gas and peculiar smell in operating room.
(3) Maintain positive pressure in operating room.

The requirements for fresh air volume given in the building technical specifications for clean operation Department of hospital (GB 50333-2013) are: 15 ~ 20cmh / ㎡, which is determined by the area of operation room.

In addition to the above three principles, the determination of the fresh air volume of the operating room in this design also needs to meet the principle of being able to bear all the indoor wet load. Its purpose is to realize the operation of the air conditioning box in the operating room under dry condition. The biggest advantage of dry condition operation is to eliminate the conditions of bacteria in the air conditioning box.

In this scheme, six operating rooms share one fresh air air conditioning box. The most advanced HRM heat recovery heat pipe and DHP heat pipe technology are used in the fresh air conditioning box, which can save more than 35% energy compared with the conventional design. According to the specification, the total fresh air volume is 4540 CMH, while in order to achieve dry operation, the fresh air volume of 6600 CMH in this scheme increases by 45.4%, only 10% of energy consumption is increased, while the heat pipe technology saves 35.4% of energy.

It can be seen from the enthalpy and humidity diagram that the outdoor fresh air is precooled from point w through our heat pipe to point C, from point C to point CC is the working state of the surface cooler, from point CC to point CH3 is the reheating process of the heat pipe, and then mixed with the return air state point R3, and sent into the room.

To sum up, it can be seen that the traditional air conditioning process is limited to the indicators of energy consumption, and the absolute humidity of the air supply into the operating room is on the high side, resulting in the situation that the indoor relative humidity is generally on the high side. The AHU with HRM / DHP heat pipe can achieve 50% relative humidity in the room and make the main circulation AHU in the operating room operate in dry condition.

2. Air conditioning design of ICU ward

The air conditioning system of ICU ward is designed as a complete fresh air and exhaust air conditioning system. The aim is to reduce the incidence of nosocomial cross infection as much as possible. For the air conditioning of other areas except wards in ICU ward, the mixed treatment of return air and fresh air is adopted to reduce energy consumption. < br / > in ICU ward, there are two composite air conditioning boxes: < br / > one is 8000cmh air supply / 5000cmh exhaust heat recovery type new air unit. Of the 8000cmh total fresh air supply volume, 6000cmh is used for ICU ward and 2000cmh is used for other areas. < br / > ICU ward, air supply parameters in summer: 18 ℃ / 13.6 ℃, rh62%. Relative to each bed, air supply volume is 680cmh, which can provide 2.2kw/bed cooling capacity and 1.1kg/h * bed dehumidification capacity. < br / > in other areas, the air supply parameters in summer: 16.1 ℃ / 13.9 ℃, rh79%, which can provide 25.2kw cooling capacity and 3.5kg/h dehumidification capacity. 8400cmh air supply volume is converted into 49m? / h ·㎡ air supply index per unit area, and 148w / ㎡ cooling capacity per unit area.

Energy saving analysis

1. Operating parameters

Air inlet conditionWorking condition after precooling by HRMWorking condition after DHP PrecoolingWorking condition after surface coolingReheating condition
Dry bulb (℃)3529.5625.251117.95
Wet bulb (℃)28.1726.9125.2510.7013.56
relative humidity60%81.6%100%96.54%61.6%

2. Energy saving analysis and calculation

The combination of heat recovery and dehumidification heat pipe of the project not only achieves the effect of energy saving, but also greatly improves the air condition of the operating room.

a. Calculation of unit energy consumption reduction

Saving cooling capacity of surface cooler: taking a new air conditioner of 8000m? / h as an example, compared with the conventional treatment process, the heat pipe heat recovery type air conditioner can save 34.5kw.

b. Operation cost saving calculation

Air conditioning operation time:10h / day * 300D = 3000h (all year round)
Total pue of the system2.0
electricity fees:1 yuan / kW. H

The annual operation cost saved is 52000 yuan. Combined with the initial investment, the initial investment of increasing heat pipe heat recovery can be recovered in two years.

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