Heat Pump Do It Yourself Install
Often an 'air-to-liquid' heat pump is used in which the evaporator is located in the exhaust air stream to extract heat from the outgoing air, while the condenser is located in a reservoir tank, to boost water temperature. Sometimes the condenser may be located in a fan coil unit through which indoor air is continuously circulated and heated (an air-to-air heat pump system). To extract maximum efficiency, heat pump output may be split between space heating and DHW heating. The advantages of a ventilation exhaust air heat pump are as follows There is potential to upgrade exhaust systems or passive stack ventilation systems by incorporating a heat pump. The disadvantages of ventilation exhaust air heat pump are
A heat pump is a year-round air-conditioning system that provides warm air during the winter and cool air during the summer. It is basically a compressor-cycle air-conditioning system (similar to the one described previously) that can operate in reverse. During the reverse operation, the condenser functions as an evaporator, and the evaporator functions as the condenser. The overall refrigerant cycle, however, remains the same. (See page 230 and FIG. 17-1 for the operational flow details.) When the system is operating, the condenser (which is located in the house) is cooled by the air that is circulated around the house. As this air passes over the condenser, it absorbs heat that is used for heating the house. For the cycle to operate properly, the evaporator (which is located on the outside) must absorb heat from the outside air. Even when the outside temperature drops to as low as 20 F. the evaporator can absorb heat because the refrigerant within the evaporator is at a lower...
If you use electricity to heat your home, consider installing an energy-efficient heat pump system. Heat pumps are the most efficient form of electric heating in moderate climates, providing three times more heating than the equivalent amount of energy they consume in electricity. There are three types of heat pumps air-to-air, water source, and ground source. They collect heat from the air, water, or ground outside your home and concentrate it for use inside. Heat pumps do double duty as a central air conditioner. They can also cool your home by collecting the heat inside your house and effectively pumping it outside. A heat pump can trim the amount of electricity you use for heating as much as 30 to 40 . Heat Pump Tips Do not set back the heat pump's thermostat manually if it causes the electric resistance heating to come on. This type of heating, which is often used as a backup to the heat pump, is more expensive.
Small heat pumps using exhaust heat from a ventilation system with heat recovery can provide seasonal performance factors (SPFs) higher than 3, making heat production by this method more efficient than direct electric heating. The investment costs for these combined systems are higher than for an ordinary resistance heater, but the energy savings during the system lifetime can offset this. When domestic water is heated by a low power heat pump coupled to a 150 litre to 200 litre boiler, there may be hot water shortage for short periods during the year. To economically solve this problem, a flow-through water heater is a reasonable alternative. This heater should be arranged after the heat pump so that direct electric heating is only called for when the heat pump is unable to deliver the needed heating power. If the system is properly dimensioned, such occurrences should be rare. Accordingly, the absolute amount of electricity consumed for this purpose should be minimal over the year....
The lower the space heating demand, the higher the specific primary energy demand per kWh heating. For the reference house, a low temperature gas heating system with radiators was assumed for the passive house standard, a heat pump mainly heating warm water and air was assumed. Since the tool used was a German tool (PHPP), the conversion factor for electricity is for the German energy mix. If the primary energy savings are related to the gross area of solar wall heating, this results in primary energy savings from 50 to 200 kWh (see Figure 9.4.9). It has to be kept in mind that the solar
Heat pumps and condensing gas furnaces perform with a higher efficiency if low temperature radiant surfaces are used to distribute the heat. The COP of an earth-coupled heat pump increases about 30 per cent if the temperature of the heating system is reduced from 45 C to 35 C. The efficiency of a condensing gas furnace increases approximately 3 per cent to 5 per cent.
The energy requirements for this 7,000-square-foot home on Bowen Island were lowered with various methods including installing a geothermal system that provides heating for the house and pool, in-floor heating and heat recovery, as well as an airtight heat-efficient wood-burning stove with limited emissions. The house, designed by architect Frits de Vries, also incorporates a sewage treatment facility, rainwater storage, a storm water drainage field and a horizontal geothermal field.
A swimming pool heater is not mandatory, but most houses with pools have one for comfort and because the heater can extend the swimming season. Most swimming pools are heated with a gas-fired heater, although they can also be heated with an electric heater and to a limited extent with solar heating or a heat pump. The ignition system in gas-fired heaters will be either a pilot light or electronic spark ignition. Either natural gas or propane gas (LP) can be used as the fuel for firing the heater. However, a heater that is designed for natural gas should not be used with propane
Whistler log home included retaining the building shell while incorporating timber details into the interior and an addition. The redesigned floor plan eliminated dark hallways while the main floor was opened up as a great room incorporating the kitchen, living room and dining room. A new high-efficiency fireplace with natural stone facing was installed to assist a new geothermal heat pump for home heating.
As discussed above, the primary energy equivalent of the annual PV yield can offset some to all of the primary energy (fossil fuels and electricity) needed by a house. In the case of an all-electric house (for example, space heating and DHW supplied by a compression heat pump), the PV yield can be directly compared to the electricity consumption by these technical systems. A sophisticated energy-saving concept is a precondition for such a PV application. Figure 14.1.1 shows the relevance of the PV output for different high-performance housing concepts. The light grey arrows indicate primary energy delivered the dark grey arrows point to the primary energy equivalent of the annual PV yield. The width of each arrow indicates the amount of energy. Except for the stand-alone case, all PV systems are grid connected.
Electricity, heat pump Air-water heat pump for space heating and DHW If no PV system were built, the electricity mix used for the building operation would amount to about 20 per cent of the total impact of the house. The impact of the electricity need by the heat pump with the Swiss electricity mix (high amount of hydro energy and low share of fossil fuels) is nearly offset by the output of the PV system. For the European electricity mix (Union for the Coordination of Transmission of Electricity, or UCTE), the house with a PV system clearly has an advantage and reduces the total impact by 25 per cent. In this case, the impact payback time for the amorphous PV cells would be four years.
Ventilation systems with an efficient exhaust air heat recovery only need a small booster heater to provide sufficient heating power. Several solutions are available heat pumps that extract heat from the exhaust air after the heat exchanger or solar thermal systems backed up by electric or fossil-fuelled furnaces. Natural and propane gas-fired condensing heaters can supply this backup today. Small and highly efficient oil boilers with low emissions are still under development. Several systems developed for fossil fuels have been adapted to burn renewable fuels, such as oil from sunflower seed. Combined systems that produce both heat and electrical power (combined heat and power, or CHP) are attractive, given the high primary energy value of electricity. Because of their high investment costs they are not interesting for high-performance single family houses because their demand for heat is too small. Where buildings and loads can be aggregated, over a micro heating network to create a...
The most prevalent solution is a heat pump, using as its heat source the exhaust room air directly or, in temperate climates, a ventilation heat exchanger. Its limitation is that in very cold weather, it must switch to resistance heating. However, during most of the heating system it can deliver from 1 kW of electricity up to 3 kW of heat. If it is coupled to a ground heat exchanger (an anti-freeze solution circulated through a buried pipe circuit), an even higher output is possible. For ecological reasons, an obvious solution is a solar thermal system. With only 1 m2 to 2 m2 of collector per person, this proven technology can cover half the water heating demand. While, economically, it can be argued that if the heat production is by a heat pump or wood pellet stove,
Near-surface geothermal systems, in which a heat pump can achieve nearly constant heat fluxes throughout the year, are a much more promising approach. Such systems can also be used for preheating cooling outside air before it enters the air heating unit (AHU), and may thus significantly reduce the heat losses of the ventilation system. Such a configuration also avoids the freeze-up problem of high-efficiency ventilation air-to-air heat exchangers, as shown in Figure 12.10.2. Heat from near-surface layers can be taken from groundwater directly by using a fountain technology. Heat can also be extracted from near-surface earth layers by means of horizontally or vertically installed heat exchangers (see Figure 12.10.3). The extracted heat will be transformed by heat pumps to a higher temperature level. The lower the temperature of the heating system, the higher the efficiency of the heat pump. The heat pumps normally run in a monovalent mode, using buffer storage to harmonize the...
Central heating systems 182 Heating outlets registers and radiators 183 Thermostat and master shutoff 183 Warm-air systems 184 Advantages 185 Disadvantages 185 Gravity warm air 185 Forced warm air 187 Controls 187 Distribution systems 188 Supply registers and return grille 189 Heat pump 190 Hot-water systems 190 Gravity hot water 191 Forced hot water 192 Boilers 192
Leon Glieksman (coeditor) is a professor of Building Technology and Mechanical Engineering and has been the head of MIT's Building Technology Program In the Department of Architecture for the past 17 years. He has worked on research and consulting related to energy-efficient building components and design, Indoor airflow, and Indoor air quality. He developed the simulation program for heat pumps that forms the basis for one of the most popular heat pump programs available today. He did basic studies to improve thermal Insulation for buildings during the period when CFCs were removed from insulation. He coheads a joint study with Cambridge University researching the use of natural ventilation in buildings to improve Indoor air quality and reduce energy used for air-conditioning. Glieksman and coworkers are developing a website for advanced envelope systems that can be easily used by architects and developers In the early stages of design. He is the author of over 200 papers In the area...
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