cooling tower geothermal systems: heating, from the ground up

by:Hengju     2019-06-28
One of their biggest challenges is to require maintenance and engineering managers to provide comfortable temperatures and good indoor air quality while keeping budgets tight.In addition to energy costs, there are maintenance costs for HVAC, boilers, chillers and cooling towers, which can expand the skills and time of employees in many ways.However, there is a way to provide a high level of comfort without increasing the budget or the burden on employees.Geothermal heat pump systems can reduce maintenance and energy costs by half.
The geothermal heat pump system relies on the temperature of the earth to heat and cool buildings.Although there are a wide variety of designs, the most popular ones depend on heat pumps and enclosedA pipeline loop system laid underground or under water bodies.The efficiency and simplicity of the system is due to the closureAs a loop system for large heat exchangers.The cycle is full of heat-Transfer fluid, usually water or water-antifreeze mix.When a facility needs to be cooled, heat is transmitted from the building to the Earth.When heating the facility, heat is absorbed from the Earth and transferred to the building.The system uses a heat pump, uses a refrigerant cycle to obtain low-quality heat and concentrates it to high-quality heat.Then heat it with a pump and a fan.Because it moves heat and does not generate heat, the system is effective and simple.In addition, while most mechanical cooling systems work under the same principle, geothermal systems gain efficiency due to the size of their main heat exchangersthe loop.The core of this process is two thermodynamic principles: heat always flows from heat to cold, the greater the temperature difference, and the higher the heat transfer rate.6 to 8 feet below the surface of the Earth, the ground maintains a constant annual temperature, from 45 degrees north latitude to 70 degrees south latitude.Because the temperature of the Earth is stable and the surrounding air temperature is not stable, there are seasonal differences in most climates, which makes the EarthEfficient heat process.
The relative simplicity of the system is to some extent the reason for making them cost-effective.The geothermal heat pump system is not dependent on the boiler and cooling tower.Self-reversing-Circular technology is deployed at the point of use, and there are only two pipes that provide heating and cooling, unlike most conventional systems.There is no large chiller in the mechanical chamber, and there are no packaging units on the roof that are exposed to these elements and pose potential problems to the roof system.All key equipment except ground circuit-Pumps, rolling compressors and fansInside the building, it is not protected by elements.Heat pumps are generally relatively small and flexible in design.And some manufacturers will produce 50-Tons of capacity pumps, mostly from 2-10 tons of commercial and institutional markets.To get a higher tonnage capacity, connect multiple heat pumps together.The heat pump can be fixed in an area distribution network that allows point-to-pointof-Use heating or cooling.
There are other savings.Most of the pipes in these systems are polyethylene plastic pipes such as gas-Pipes, not copper or ironbased piping.Pipe works are usually not part of the installation except for the use of point distribution and the new-air delivery.There are also savings in maintenance and operation.According to the American Society of Heating, Refrigeration and AirAir conditioning engineer (ASHRAE), the annual maintenance cost of traditional boiler, cooler, cooling tower system is 65 cents per square foot.Geothermal system with a cost of 22-25 cents per square foot.Because there are fewer devices to pay attention to, the cost is lower.In the necessary maintenance tasks, the replacement of the filter is the highest.The study notes that less than half of the tasks involved in lubrication and checking the fan belt.There is no water problem to worry about.You do not need to clean or process the cooling tower.Heat pumps are hardly maintained.The only cost is to replace the filter and maybe check the package and fan belt of the circulating pump.The heat pump itself is a selfUnit included in factory testing.Even if the refrigerant is in the sealing system, no inspection is required.
Geothermal heat pump technology is energy efficient and provides about 25-50% less than traditional systems.Recent technological changes have changed significantly.The biggest change happened when the industry switched from a reciprocating compressor to a rolling compressor.There has been a considerable improvement in efficiency.The manufacturer also began to use variable speed fans and compressors.There are also improvements in the reverse and expansion valves of pumps and evaporation coils.The service life of the geothermal heat pump system is 22 years or moreThe ground pipe can last for 50 years or more.Efficiency has improved due to these and other changes.The performance coefficients of these systems range from 3 to 4.5, SEER rating from 13-14 to 17-18.Additional changes in technology and installation make the service life of these systems betterCycle investment.For example, the connection of the ground pipe is mostly done at the factory under controlled conditions, not at the site.When the joint must be made on site, the tools to do this have been improved.The leakage in the loop is almost unheard.Life-Cycle-
Because a large part of the cost of these systems is to install buried rings, the cost of the entire system begins to decrease as the system becomes larger.50 tons is about a tipping point.At this point, the cost of digging more trenches or drilling more wells will not continue to increase at the same rate because the contractor has brought his equipment, the staff were also on site.The first cost of the system depends on many local variables.Is there competition in geothermal systems?Are drilling workers available at any time?What is the soil and geology of this area?Over the years, these systems can pay more for themselves, avoiding the cost of maintenance and roof repair, because the equipment, mainly the loop system, lasts for a long time, and energy efficiency is really icing on the cake.
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