Heat Pumps for Hospital for Heating and Hot Water
Project User: Zhejiang City People's Hospital
Project Address: Zhejiang City, China
Project Introduction: use air source heat pump for heating
Project Models: 8 RBR-80F air source heat pumps
Foreword: Facing the increasingly severe atmospheric environment situation, the country has stepped up its efforts to rectify coal-fired boilers, and more and more customers have begun to pay attention to clean and renewable energy; in recent years, due to the unique advantages of energy saving and emission reduction of air source heat pumps, It has attracted more and more attention. In particular, a series of policies have been issued in Zhejiang Province, and air source heat pumps have been included in the category of renewable energy, and the application of this method is encouraged.
Comprehensive consideration of using pressure-type air source heat pump hot water system
Save 2.2 million yuan in operating costs in 5 years
A successful application project of a pressure-bearing heat pump hot water system in a People’s Hospital in Zhejiang. The tertiary general hospital covers an area of 116 acres, with a total construction area of about 102,000 square meters, 800 beds, and two parks in the east and west.
It is understood that the hospital originally used municipal steam to supply hot water, but due to the large number of functional areas of medical buildings and strict divisions, in order to control diseases and prevent the spread and spread of diseases, there is a certain protective distance between each area. Therefore, the heating pipelines in the hospital are relatively scattered, the pipelines are longer, and the steam/water drive in the heating system consumes a lot of energy, resulting in a very high overall energy consumption of the hot water system.
According to the requirements of the People’s Hospital, independent point-to-point air source heat pump hot water systems are set up for the canteen, staff dormitories and infectious wards, without changing the original closed water supply system. The modified system must fully meet the daily hot water demand. And leave a design margin. Because the advantages and characteristics of air source heat pumps can meet this requirement, the People’s Hospital finally decided to adopt the "energy-saving benefit sharing contract energy management model" to implement some functional areas (canteens, staff dormitories, and infectious ward buildings). The hot water system was transformed, and "5 sets of 10-hp pressurized heat pump hot water systems" were selected to supply hot water for hospital canteens, staff dormitories and infectious wards, and a 5-year energy-saving benefit sharing energy management contract was signed.
Canteen: 2 sets of 10 HP pressurized heat pump hosts + 2 sets of 12kW
Heating water tank + 10 455L closed hot water storage tanks
Installed on the roof
Staff dormitory: 2 sets of 10 HP pressurized heat pump hosts + 2 sets of 12kW
Heating water tank + 15 455L closed hot water storage tanks
The host is installed outdoors, and the water tank is installed indoors
Infectious Ward: 1 set of 10 HP pressure-bearing heat pump main engine + 1 set of 12 kW
Heating water tank + 3 455L closed hot water storage tanks
The host is installed outdoors, and the water tank is installed indoors
It is reported that during the contract period, the energy management contractor undertakes the entire project's transformation funds, including pressure-bearing heat pump equipment, installation, commissioning, and maintenance, and only recovers investment costs and profits in proportion to the saved operating costs. After the contract expires, the entire pressurized heat pump system and subsequent energy-saving benefits will be owned by the hospital. After calculation, it is estimated that the cost will be recovered within 3 years, and the hospital can save more than 2.2 million yuan in operating costs within 5 years.
At the same time, the project was officially launched in December 2016, and the construction of the project began in mid-January 2017, with the middle span of the 2017 Spring Festival, and the construction was completed in mid-February 2017. After the completion, it was switched to the new system operation. During the trial operation and debugging period, it was about 2 weeks. It was officially put into operation in March 2017 and the operation was stable. According to the relevant person in charge involved in the project, since the adoption of the pressure-bearing heat pump system, many difficult problems have been solved for the hospital and it has been highly recognized by the hospital.
Staff dormitory configuration
Infectious ward building configuration
Innovative direct heating pressurized heat pump technology
Energy saving benefit 574,000 yuan/year
According to the person in charge of the project, after the transformation of this pressurized heat pump hot water system, the rated COP of the heat pump host can reach 4.59, which is at the leading level in the industry. It also adopts innovative direct heating and pressure technology. The heat pump main unit is heated by a large temperature difference, and the actual operating efficiency is higher. This solves the problem that the traditional heat pump is in the middle and high temperature heating state for a long time in the actual operation process, which causes the actual operating efficiency to greatly decrease The technical problem is very energy-efficient.
More importantly, it has a more prominent energy-saving effect at the system level: the entire system adopts a modular pressurized water tank. With the characteristics of high hot water utilization rate of the closed system, and replenishment when used, the hot water storage of the system is only traditional About 1/3 of the heat pump system, the heat preservation performance of the original water tank is much better than the ordinary open water tank, so the heat loss of the system is greatly reduced; the pressurized water tank does not need to pressurize the hot water when the water is supplied. Power consumption is also greatly reduced. Compared with the traditional heat pump system, the comprehensive energy consumption of the system can be reduced by 30%, which can save a considerable amount of operating costs each year.
Combined with the "Examination Report on Energy Conservation of the Steam System Reform Project in the Eastern District of XXXX People's Hospital" issued by the "China Quality Certification Center", according to the equipment energy consumption before and after the project transformation provided by the energy user and the energy price confirmed by both parties, the annual steam consumption before the project implementation is 3633.59t, equivalent to 325.74 tons of standard coal; after the implementation of the project, the annual energy saving will be 278 tons of standard coal, and the annual energy saving benefit will be 574,000 yuan.
Modular pressure-bearing system is effective
Highly recognized by the hospital
As patients are generally weak, hot and cold hot water is not conducive to the recovery of patients, so the hospital has very high requirements for hot water comfort. The pressure-bearing heat pump hot water system can be well satisfied. It can achieve the same terminal cold and hot water pressure. No matter how the water consumption changes, the cold and hot water pressures are always balanced; plus the modular pressure water tank can make hot water Stored in separate warehouses to avoid mixing of hot and cold water inside the water tank, so that hot water can be supplied at a constant temperature and pressure around the clock, completely solving the problem of hot water "suddenly hot and cold" common in traditional heat pump systems from the source.
At the same time, the hospital attaches great importance to medical and sanitation, and it is indispensable to protect the sanitary water in the hospital. Whether it is the hot water for showers in the infected building, the food raw materials used in the cafeteria or the washing of tableware, attention must be paid to the sanitary supply of domestic hot water. , So as not to affect the health of patients and medical staff. However, because the open water tank equipped with the traditional heat pump is connected to the atmosphere, the water temperature in the water tank is maintained at 40~50℃ for a long time, which is particularly easy to breed bacteria and microorganisms, which affects water quality and hygiene. The large tonnage open water tank is also time-consuming, laborious and costly to clean . In contrast, the modular pressurized water tank used is isolated from the atmosphere, and the system can also integrate a one-key high-temperature sterilization function to regularly raise the water temperature to above 60°C to kill Legionella in the water. The closed water tank is also equipped with Drain valve, easy to clean and drain.
According to the relevant personnel of the hospital, “Through contract energy management, with a sophisticated energy-saving operation and management model, and effective solutions, resources are saved to the greatest extent. In the process of implementing contract energy management projects, our hospital has zero investment , Zero risk, the overall operation of the project is carried out by the energy management contractor. In addition to enjoying the latest comfortable hot water technology brought by this project and considerable energy-saving benefits, it can also save equipment management. This model not only avoids us The tedious work brought about by the independent energy-saving renovation and management of the hospital can also reduce the operating cost of the hospital. At the same time, the hospital can also enjoy professional energy management services, and can concentrate on building medical services and improve the overall service capabilities of the hospital. This project has laid the foundation for our hospital to become a pioneer in energy conservation and emission reduction in medical and health institutions."
Four innovation highlights
Highlight the technical advantages of pressure-bearing heat pumps
1. Innovative direct heating pressurized heat pump technology, efficient heat exchange, COP up to 4.59
The pressure-bearing heat pump hot water unit uses the principle of reverse Carnot cycle and uses large temperature difference heat exchange to make full use of the large amount of heat in the air to provide heat that is several times the power consumption. The COP is up to 4.59. Compared with traditional heat pumps, Operating costs are lower.
2. Modular pressure-bearing system, greatly reducing system loss
Compared with the ordinary open heat pump system, the modular pressure heat pump system can greatly reduce the heat dissipation loss of the water tank in the system and the power consumption of the water pump in the system transportation link, thereby greatly saving operating costs.
3. Modular pressure-bearing system, constant temperature and pressure, stable and comfortable water supply
Non-pressurized system, hot water is provided by booster pump, cold water is provided by municipal pipe network, cold and hot water pressure cannot be balanced by different sources, and the top of the open water tank is filled with water, which will easily cause the mixing of cold and hot water in the water tank. The water is hot and cold.
4. Excellent system integration and high reliability
Because air energy heat pumps have a good development prospect, in just a few years, a large number of heat pump product manufacturers have emerged on the market, and the quality of their products is uneven. Most companies can only supply heat pump hosts, water tanks, solenoid valves, and electric heating. The system also needs to rely on the corresponding supporting manufacturers, the system integration is poor, and the installation of the later system has also increased a great deal of difficulty. Therefore, the industry has always had a saying that "three points depend on products, seven points depend on installation".
However, the commercial pressurized heat pump hot water system is highly integrated, not only providing original quality, but also more convenient for later installation. After the system is in place, only water and electricity need to be connected, without on-site refrigerant charging and welding, which is different from traditional heat pumps. The uncontrollable system installation and construction quality, and the system's excellent system integration capability make the system stability and reliability quite high.
In summary, the commercial pressurized heat pump system is considered by the industry as the best solution for a new generation of energy-saving and comfortable hot water by solving the traditional open heat pump system's problem of "sudden cold and hot, high failure rate in winter".