By: ViedyIn recent years, “Solar Heat” frequently appear in the public eye, then what does solar energy heat pump?

“Solar heating systems Application Manual” gives the following set: “Solar heat pump heating system is the solar collector and heat pump combined into a system, the solar energy to provide the required heat source heat pump will be upgraded to low-grade heat high-grade thermal energy, so as to heat buildings. “This is probably the most representative of this stage the expression on the solar heat pump, but it can not cover all of the products (such as solar air conditioning, etc.). According to my understanding, the current domestic market measures with solar heating or cooling integrated system solutions are many, not every class in line with the above interpretation. Therefore, clear the working principle of different options, and each program is necessary to find a suitable name.

In the history of refrigeration technology, the solar cycle as a heat driven refrigeration system, Energy, Technology has been an important subject, the specific implementations include both solar electric photovoltaic system-driven compressor to run the vapor compression cycle, such as Japan Sanyo Sharp’s solar energy air-conditioning and other development, including solar thermal driven absorption, adsorption and the jet cycle, such as Haier, Qingdao Olympic Sailing Centre for the solar air-conditioning, great for the Tianjin Huayuan Software Park to provide a solar air conditioning. China put into operation earlier validation of the system, is the Central Institute of Technology in 1980, developed a small solar-powered “ammonia – water absorption cycle air conditioning and refrigeration equipment.” Since then, several universities and research institutions have organized a research and development, some enterprises were product development and production. The air conditioning unit with heat pump in the lack of products to run features, but the technical features of these systems are clearly not “by the solar heat source heat pump to provide the required” and therefore such systems should be described as “solar-driven heat pump cycles equipment. ”

From the viewpoint of thermodynamics, heat pump system is based on the cost of useful energy consumption of low temperature heat to raise the temperature, making it meet the requirements of high-temperature heat. Existing electric heat pump, gas pump is to drive the heat pump’s energy type named to this naming, the use of solar-driven heat pump system can be called the solar heat pump. However, the market, there is a common type of name by way of low temperature heat source, such as air-source heat pumps, ground source heat pump, water pump, etc., according to this naming to take advantage of solar heat collector was as low temperature heat source heat pump The system, called the solar heat pump. Followed by two years in addition to the above way of naming the system, there is a system – solar refrigerator, solar-driven refrigeration cycle is used, while the refrigerator and heat pump only between the application and the naming convention of the differences in a number of occasions to heat pump chiller refrigerator is named.

Here, the temporary insertion of a topic, the Chinese market in recent years, there is also an “air heat pump.” Actually means “air-source heat pump”, as the main reason to change its name, is said to be made was that the environmental air source heat pump air heat is a renewable energy, so use the “air can” name to be prominent. The basic features of energy can be obtained through the appropriate conversion to useful energy, whether from a technical point of view or a legal perspective, ambient air heat are not renewable energy. As the ambient air heat to useful energy constant is zero, it is not energy, but is not renewable energy. Air heat is a variety of energy conversion process in the different end product is indeed inexhaustible, so as to “energy waste” to describe the ambient air heat more appropriate.

Driven heat pump can be useful to use, but as a low-temperature heat source heat pump can not heat energy, which is based on the thermodynamics of heat pumps naming. Solar thermal energy obtained from both can be used to drive heat pump system can be used as low temperature heat source heat pump system, the former may be called Solar Heat Pump (SolarHeatPump), which may be known as the solar source heat pump (SolarSourceHeatPump), this can be avoided and as the name duplication of confusion, but also with the existing heat pump naming convention.

Should be pointed out that many of the “Solar Heat” corresponds to the English is SolarAssistedHeatPump, the use of such devices is the solar thermal process in different ways, the process of co-operation with the heat pump can not only process driven by heat pump, solar energy can be used The heat pump can also be based on solar thermal process-oriented, with a heat pump solar thermal devices, of course, include both the parallel combination of the two processes.

Therefore, solar energy – heat pump or solar heat pump combination as a Chinese translation, more accurate.

Common in domestic solar collector and electric heat pump water heater combined program are: Option One, direct expansion – the heat pump evaporator as a solar collector; Option II, non-tandem direct expansion – the solar heat pump evaporator thermal storage tank was heat; program three parallel non-direct expansion – air source heat pump and solar thermal storage tank water heater share; program 4, the direct expansion of non-dual heating source – In a direct expansion of non-tandem, based on then a heat pump system in parallel with the air heat exchanger evaporator. Which meet the definition of solar heat pump is the program I and program II; the program three low temperature heat source heat pump side has nothing to do with solar collectors, solar heat pump does not meet the definition of the heat pump air source heat pump is actually called the Air source heat pump and solar water heaters more appropriate. Program 4 is the solar heat pump and air source heat pump share the same compressor, known as the solar heat source and air source heat pump is appropriate combination, these types of programs using solar energy – solar heat pump water heater or combination of heat pump water heater may be more appropriate to summarize.

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By: Christopher Lollini

In simple terms the Solar Heat Gain Coefficient is the percentage of heat that strikes the exterior of a window that is passed to the interior of the home and is a general gauge of the window’s energy efficiency. The heat gain coefficient is an important measure of a windows ability to block this heat transfer into a building and is critical to lowering cooling costs in the summer months. The less thermal energy that a window allows to enter a home, the less cooling will be required to keep the home at a comfortable temperature.

The Challenge

The challenge is that some homes are designed to incorporate passive solar heating in the winter months and with the goal to allow this solar radiation to penetrate deep into the home to warm the walls and floors. In this case you need the windows to allow the sunlight to pass through the exterior windows untouched to be able to take advantage of it. To control this heating effect in the summers these homes typically take advantage of strategically placed awnings or window blinds to control the amount of sunlight that enters the home.

Coefficient Rating

The Solar Heat Gain Coefficient rating is listed as a number between 0 and 1 and the closer to 0 your window is rated, the better it is at blocking this radiant heat from entering your home. Even though this seems like a simple metric to use when trying to gauge how well a window can block heat from invading your home, there are actually several numbers under the cover of this single coefficient rating number. The main number used for comparison by most companies refers only to the glass and glazing itself. While this is a pretty good indicator of how well a window blocks this solar heat from entering your home, it is not the only way that a window transmits this exterior heat into your home. The frame and mounting hardware are also heated by the sunlight and can transfer this heat to your home as well. The second number is usually given as a whole window Solar Heat Gain Coefficient rating and is a more representative number for the entire window.

Lowering the Gain Coefficient

The way that a company lowers the Solar Heat Gain Coefficient of a window varies by manufacturer, but usually involves the application of a particular glazing material to the window glass. This glazing typically consists of the application of a low-emissivity coating layered onto the glass and bonded. This low-emissivity coating allows the windows to reduce the amount of heat it loses in the winter months and also better controls its heat gain coefficient to increase its overall energy efficiency. By using these specialized materials to treat the glass these windows can help to make your home much more energy efficient and lower your heating and cooling bills as well. To help improve the Solar Heat Gain Coefficient of existing windows, there are several types of tinting materials that can be applied to them on-site. These tinting materials will improve the Solar Heat Gain Coefficient of these older windows and help you control your energy costs for a small investment in upgrading your windows with the tinting.

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